Date   

Re: [PATCH] UefiCpuPkg: ResetVector Tool Support for Python 3

Michael D Kinney
 

According to the logs, the .raw file binaries were committed 10 years ago.

This commit in 2014 make a change to how the build defines are processed. It also switches from using ASM to NASM for the assembler.

https://github.com/tianocore/edk2/commit/5a1f324d946cb1be2dc1226752b1965d6633232f#

I think one interesting test to make sure the binaries produced before and after your change produce the same binaries.

That would at least confirm that the Python script changes are not introducing any changes and allow this update to move forward without the binary files.

A detailed review and testing of the binary differences needs to be done before committing any new .raw file.

Mike

-----Original Message-----
From: S, Ashraf Ali <ashraf.ali.s@...>
Sent: Thursday, July 22, 2021 10:10 AM
To: Kinney, Michael D <michael.d.kinney@...>; devel@edk2.groups.io
Cc: Ni, Ray <ray.ni@...>; Kumar, Rahul1 <rahul1.kumar@...>; De, Debkumar <debkumar.de@...>; Han, Harry
<harry.han@...>; West, Catharine <catharine.west@...>; V, Sangeetha <sangeetha.v@...>
Subject: RE: [edk2-devel] [PATCH] UefiCpuPkg: ResetVector Tool Support for Python 3

Hi., Michael

Even If we generate the binaries using the Python2 also, it's getting changed.

Can you confirm from your end by generating the binaries using the build.py in Python2


Regards,
Ashraf Ali S
Intel Technology India Pvt. Ltd.

-----Original Message-----
From: Kinney, Michael D <michael.d.kinney@...>
Sent: Thursday, July 22, 2021 10:15 PM
To: devel@edk2.groups.io; S, Ashraf Ali <ashraf.ali.s@...>
Cc: Ni, Ray <ray.ni@...>; Kumar, Rahul1 <rahul1.kumar@...>; De, Debkumar <debkumar.de@...>; Han, Harry
<harry.han@...>; West, Catharine <catharine.west@...>; V, Sangeetha <sangeetha.v@...>
Subject: RE: [edk2-devel] [PATCH] UefiCpuPkg: ResetVector Tool Support for Python 3

Hi Ashraf,

Why would an update to the Python script to Python3 cause any changes to the binary images the script produces.

If they are different, then that would seem to imply that the change was not compatible from a behavior perspective.

Mike

-----Original Message-----
From: devel@edk2.groups.io <devel@edk2.groups.io> On Behalf Of Ashraf
Ali S
Sent: Thursday, July 22, 2021 9:41 AM
To: devel@edk2.groups.io
Cc: S, Ashraf Ali <ashraf.ali.s@...>; Ni, Ray
<ray.ni@...>; Kumar, Rahul1 <rahul1.kumar@...>; De,
Debkumar <debkumar.de@...>; Han, Harry <harry.han@...>;
West, Catharine <catharine.west@...>; V, Sangeetha
<sangeetha.v@...>
Subject: [edk2-devel] [PATCH] UefiCpuPkg: ResetVector Tool Support for
Python 3

[edk2-devel] [PATCH]
REF:https://bugzilla.tianocore.org/show_bug.cgi?id=3506

Build Scrips for Reset Vector currently based on Python 2 which is
already EOL, needs to modify the build script based on Python 3,
update the Binary accordingly.

Change-Id: I2cfef08177951f2f29ee168ac4a9de9b10769ea1
Cc: Ray Ni <ray.ni@...>
Cc: Rahul Kumar <rahul1.kumar@...>
Cc: Debkumar De <debkumar.de@...>
Cc: Harry Han <harry.han@...>
Cc: Catharine West <catharine.west@...>
Cc: Sangeetha V <sangeetha.v@...>
Signed-off-by: Ashraf Ali S <ashraf.ali.s@...>
---
.../Vtf0/Bin/ResetVector.ia32.port80.raw | Bin 516 -> 484 bytes
.../ResetVector/Vtf0/Bin/ResetVector.ia32.raw | Bin 484 -> 468 bytes
.../Vtf0/Bin/ResetVector.ia32.serial.raw | Bin 884 -> 868 bytes
.../Vtf0/Bin/ResetVector.x64.port80.raw | Bin 28676 -> 28676 bytes
.../ResetVector/Vtf0/Bin/ResetVector.x64.raw | Bin 28676 -> 28676 bytes
.../Vtf0/Bin/ResetVector.x64.serial.raw | Bin 28676 -> 28676 bytes
UefiCpuPkg/ResetVector/Vtf0/Build.py | 11 +++++++----
.../Vtf0/Tools/FixupForRawSection.py | 4 ++--
8 files changed, 9 insertions(+), 6 deletions(-)

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diff --git a/UefiCpuPkg/ResetVector/Vtf0/Bin/ResetVector.x64.raw
b/UefiCpuPkg/ResetVector/Vtf0/Bin/ResetVector.x64.raw
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diff --git
a/UefiCpuPkg/ResetVector/Vtf0/Bin/ResetVector.x64.serial.raw
b/UefiCpuPkg/ResetVector/Vtf0/Bin/ResetVector.x64.serial.raw
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diff --git a/UefiCpuPkg/ResetVector/Vtf0/Build.py
b/UefiCpuPkg/ResetVector/Vtf0/Build.py
index 343c53b5ff..29f29ff0c2 100644
--- a/UefiCpuPkg/ResetVector/Vtf0/Build.py
+++ b/UefiCpuPkg/ResetVector/Vtf0/Build.py
@@ -1,7 +1,7 @@
## @file
# Automate the process of building the various reset vector types #
-# Copyright (c) 2009, Intel Corporation. All rights reserved.<BR>
+# Copyright (c) 2009 - 2021, Intel Corporation. All rights
+reserved.<BR>
#
# SPDX-License-Identifier: BSD-2-Clause-Patent # @@ -32,16 +32,19
@@ for arch in ('ia32', 'x64'):
'-o', output,
'Vtf0.nasmb',
)
+ print(f"Command : {' '.join(commandLine)}")
ret = RunCommand(commandLine)
- print '\tASM\t' + output
- if ret != 0: sys.exit(ret)
+ if ret != 0:
+ print(f"something went wrong while executing the {commandLine[-1]}")
+ sys.exit()
+ print('\tASM\t' + output)

commandLine = (
'python',
'Tools/FixupForRawSection.py',
output,
)
- print '\tFIXUP\t' + output
+ print('\tFIXUP\t' + output)
ret = RunCommand(commandLine)
if ret != 0: sys.exit(ret)

diff --git a/UefiCpuPkg/ResetVector/Vtf0/Tools/FixupForRawSection.py
b/UefiCpuPkg/ResetVector/Vtf0/Tools/FixupForRawSection.py
index c77438a0ce..de771eba22 100644
--- a/UefiCpuPkg/ResetVector/Vtf0/Tools/FixupForRawSection.py
+++ b/UefiCpuPkg/ResetVector/Vtf0/Tools/FixupForRawSection.py
@@ -1,7 +1,7 @@
## @file
# Apply fixup to VTF binary image for FFS Raw section # -#
Copyright (c) 2008, Intel Corporation. All rights reserved.<BR>
+# Copyright (c) 2008 - 2021, Intel Corporation. All rights
+reserved.<BR>
#
# SPDX-License-Identifier: BSD-2-Clause-Patent # @@ -15,6 +15,6 @@
c = ((len(d) + 4 + 7) & ~7) - 4 if c > len(d):
c -= len(d)
f = open(sys.argv[1], 'wb')
- f.write('\x90' * c)
+ f.write(b'\x90' * c)
f.write(d)
f.close()
--
2.30.2.windows.1





Re: [PATCH] UefiCpuPkg: ResetVector Tool Support for Python 3

Ashraf Ali S
 

Hi., Michael

Even If we generate the binaries using the Python2 also, it's getting changed.

Can you confirm from your end by generating the binaries using the build.py in Python2


Regards,
Ashraf Ali S
Intel Technology India Pvt. Ltd.

-----Original Message-----
From: Kinney, Michael D <michael.d.kinney@...>
Sent: Thursday, July 22, 2021 10:15 PM
To: devel@edk2.groups.io; S, Ashraf Ali <ashraf.ali.s@...>
Cc: Ni, Ray <ray.ni@...>; Kumar, Rahul1 <rahul1.kumar@...>; De, Debkumar <debkumar.de@...>; Han, Harry <harry.han@...>; West, Catharine <catharine.west@...>; V, Sangeetha <sangeetha.v@...>
Subject: RE: [edk2-devel] [PATCH] UefiCpuPkg: ResetVector Tool Support for Python 3

Hi Ashraf,

Why would an update to the Python script to Python3 cause any changes to the binary images the script produces.

If they are different, then that would seem to imply that the change was not compatible from a behavior perspective.

Mike

-----Original Message-----
From: devel@edk2.groups.io <devel@edk2.groups.io> On Behalf Of Ashraf
Ali S
Sent: Thursday, July 22, 2021 9:41 AM
To: devel@edk2.groups.io
Cc: S, Ashraf Ali <ashraf.ali.s@...>; Ni, Ray
<ray.ni@...>; Kumar, Rahul1 <rahul1.kumar@...>; De,
Debkumar <debkumar.de@...>; Han, Harry <harry.han@...>;
West, Catharine <catharine.west@...>; V, Sangeetha
<sangeetha.v@...>
Subject: [edk2-devel] [PATCH] UefiCpuPkg: ResetVector Tool Support for
Python 3

[edk2-devel] [PATCH]
REF:https://bugzilla.tianocore.org/show_bug.cgi?id=3506

Build Scrips for Reset Vector currently based on Python 2 which is
already EOL, needs to modify the build script based on Python 3,
update the Binary accordingly.

Change-Id: I2cfef08177951f2f29ee168ac4a9de9b10769ea1
Cc: Ray Ni <ray.ni@...>
Cc: Rahul Kumar <rahul1.kumar@...>
Cc: Debkumar De <debkumar.de@...>
Cc: Harry Han <harry.han@...>
Cc: Catharine West <catharine.west@...>
Cc: Sangeetha V <sangeetha.v@...>
Signed-off-by: Ashraf Ali S <ashraf.ali.s@...>
---
.../Vtf0/Bin/ResetVector.ia32.port80.raw | Bin 516 -> 484 bytes
.../ResetVector/Vtf0/Bin/ResetVector.ia32.raw | Bin 484 -> 468 bytes
.../Vtf0/Bin/ResetVector.ia32.serial.raw | Bin 884 -> 868 bytes
.../Vtf0/Bin/ResetVector.x64.port80.raw | Bin 28676 -> 28676 bytes
.../ResetVector/Vtf0/Bin/ResetVector.x64.raw | Bin 28676 -> 28676 bytes
.../Vtf0/Bin/ResetVector.x64.serial.raw | Bin 28676 -> 28676 bytes
UefiCpuPkg/ResetVector/Vtf0/Build.py | 11 +++++++----
.../Vtf0/Tools/FixupForRawSection.py | 4 ++--
8 files changed, 9 insertions(+), 6 deletions(-)

diff --git
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b/UefiCpuPkg/ResetVector/Vtf0/Bin/ResetVector.x64.raw
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diff --git
a/UefiCpuPkg/ResetVector/Vtf0/Bin/ResetVector.x64.serial.raw
b/UefiCpuPkg/ResetVector/Vtf0/Bin/ResetVector.x64.serial.raw
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zo6TW-v!2Pt;%0Lge_PMwVsW!MjK8C2a<RDC9LC?(Gr3sYY!2gF^h_=mH=D!wdwM1p
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z<YIBNIgHjbxmet64&&S7Fb?;BCKrpF&0&0pp2@}HW^)+#>6u(CZZ?PU20fFD#m(k0
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z9R9?~+uwiX$~`exuAIK*{?j+l>3biz{`4*LZ57d{pMBVR-05eXzPS$%o_hM0e#iO4
z-Zx!yl|1K~Y5VAFw*NPu>jxZ8+LiY1s~6g>m;cwT=R9KT36I!%{N<l{UHrsdZ+qPr
zUiqjqr>}eRnR`C$a6KFj?aVu#beNVK<DPuX;Vf^NM}9E3U2{y&zGnLu9^;vN9v64r
ze^=i%cRg^|TTWhbn5#=qjXJ!?&o3@lC-CZc=zrnA?0X*e>weB}jn}{MWe<MP>p$^j
z58iO*;u}u#y@!kU<R`D3Jo?JXOW%9t%E>M7JAA3bjNX3F;bkBC7rNV@_NLpP_Qu<v
j_J-Rp&Xu=6c;CbCb@e@7{+Tb1OP3z}mY;w3OP78Y>oK+#

diff --git a/UefiCpuPkg/ResetVector/Vtf0/Build.py
b/UefiCpuPkg/ResetVector/Vtf0/Build.py
index 343c53b5ff..29f29ff0c2 100644
--- a/UefiCpuPkg/ResetVector/Vtf0/Build.py
+++ b/UefiCpuPkg/ResetVector/Vtf0/Build.py
@@ -1,7 +1,7 @@
## @file
# Automate the process of building the various reset vector types #
-# Copyright (c) 2009, Intel Corporation. All rights reserved.<BR>
+# Copyright (c) 2009 - 2021, Intel Corporation. All rights
+reserved.<BR>
#
# SPDX-License-Identifier: BSD-2-Clause-Patent # @@ -32,16 +32,19
@@ for arch in ('ia32', 'x64'):
'-o', output,
'Vtf0.nasmb',
)
+ print(f"Command : {' '.join(commandLine)}")
ret = RunCommand(commandLine)
- print '\tASM\t' + output
- if ret != 0: sys.exit(ret)
+ if ret != 0:
+ print(f"something went wrong while executing the {commandLine[-1]}")
+ sys.exit()
+ print('\tASM\t' + output)

commandLine = (
'python',
'Tools/FixupForRawSection.py',
output,
)
- print '\tFIXUP\t' + output
+ print('\tFIXUP\t' + output)
ret = RunCommand(commandLine)
if ret != 0: sys.exit(ret)

diff --git a/UefiCpuPkg/ResetVector/Vtf0/Tools/FixupForRawSection.py
b/UefiCpuPkg/ResetVector/Vtf0/Tools/FixupForRawSection.py
index c77438a0ce..de771eba22 100644
--- a/UefiCpuPkg/ResetVector/Vtf0/Tools/FixupForRawSection.py
+++ b/UefiCpuPkg/ResetVector/Vtf0/Tools/FixupForRawSection.py
@@ -1,7 +1,7 @@
## @file
# Apply fixup to VTF binary image for FFS Raw section # -#
Copyright (c) 2008, Intel Corporation. All rights reserved.<BR>
+# Copyright (c) 2008 - 2021, Intel Corporation. All rights
+reserved.<BR>
#
# SPDX-License-Identifier: BSD-2-Clause-Patent # @@ -15,6 +15,6 @@
c = ((len(d) + 4 + 7) & ~7) - 4 if c > len(d):
c -= len(d)
f = open(sys.argv[1], 'wb')
- f.write('\x90' * c)
+ f.write(b'\x90' * c)
f.write(d)
f.close()
--
2.30.2.windows.1





Re: [edk2-rfc] RFC: EXT4 filesystem driver

Michael D Kinney
 

-----Original Message-----
From: rfc@edk2.groups.io <rfc@edk2.groups.io> On Behalf Of gaoliming
Sent: Wednesday, July 21, 2021 6:21 PM
To: rfc@edk2.groups.io; pedro.falcato@...; devel@edk2.groups.io
Subject: 回复: [edk2-rfc] RFC: EXT4 filesystem driver



-----邮件原件-----
发件人: rfc@edk2.groups.io <rfc@edk2.groups.io> 代表 Pedro Falcato
发送时间: 2021年7月22日 7:12
收件人: devel@edk2.groups.io
抄送: rfc@edk2.groups.io
主题: [edk2-rfc] RFC: EXT4 filesystem driver

EXT4 (fourth extended filesystem) is a filesystem developed for Linux
that has been in wide use (desktops, servers, smartphones) since 2008.

The Ext4Pkg implements the Simple File System Protocol for a partition
that is formatted with the EXT4 file system. This allows UEFI Drivers,
UEFI Applications, UEFI OS Loaders, and the UEFI Shell to access files
on an EXT4 partition and supports booting a UEFI OS Loader from an
EXT4 partition.
This project is one of the TianoCore Google Summer of Code projects.

Right now, Ext4Pkg only contains a single member, Ext4Dxe, which is a
UEFI driver that consumes Block I/O, Disk I/O and (optionally) Disk
I/O 2 Protocols, and produces the Simple File System protocol. It
allows mounting ext4 filesystems exclusively.

Brief overhead of EXT4:
Layout of an EXT2/3/4 filesystem:
(note: this driver has been developed using
https://www.kernel.org/doc/html/latest/filesystems/ext4/index.html as
documentation).

An ext2/3/4 filesystem (here on out referred to as simply an ext4 filesystem,
due to the similarities) is composed of various concepts:

1) Superblock
The superblock is the structure near (1024 bytes offset from the start)
the start of the partition, and describes the filesystem in general.
Here, we get to know the size of the filesystem's blocks, which features
it supports or not, whether it's been cleanly unmounted, how many blocks
we have, etc.

2) Block groups
EXT4 filesystems are divided into block groups, and each block group covers
s_blocks_per_group(8 * Block Size) blocks. Each block group has an
associated block group descriptor; these are present directly after the
superblock. Each block group descriptor contains the location of the
inode table, and the inode and block bitmaps (note these bitmaps are only
a block long, which gets us the 8 * Block Size formula covered previously).

3) Blocks
The ext4 filesystem is divided into blocks, of size s_log_block_size ^ 1024.
Blocks can be allocated using individual block groups's bitmaps. Note
that block 0 is invalid and its presence on extents/block tables means
it's part of a file hole, and that particular location must be read as
a block full of zeros.

4) Inodes
The ext4 filesystem divides files/directories into inodes (originally
index nodes). Each file/socket/symlink/directory/etc (here on out referred
to as a file, since there is no distinction under the ext4 filesystem) is
stored as a /nameless/ inode, that is stored in some block group's inode
table. Each inode has s_inode_size size (or GOOD_OLD_INODE_SIZE if it's
an old filesystem), and holds various metadata about the file. Since the
largest inode structure right now is ~160 bytes, the rest of the inode
contains inline extended attributes. Inodes' data is stored using either
data blocks (under ext2/3) or extents (under ext4).

5) Extents
Ext4 inodes store data in extents. These let N contiguous logical blocks
that are represented by N contiguous physical blocks be represented by a
single extent structure, which minimizes filesystem metadata bloat and
speeds up block mapping (particularly due to the fact that high-quality
ext4 implementations like linux's try /really/ hard to make the file
contiguous, so it's common to have files with almost 0 fragmentation).
Inodes that use extents store them in a tree, and the top of the tree
is stored on i_data. The tree's leaves always start with an
EXT4_EXTENT_HEADER and contain EXT4_EXTENT_INDEX on eh_depth != 0
and
EXT4_EXTENT on eh_depth = 0; these entries are always sorted by logical
block.

6) Directories
Ext4 directories are files that store name -> inode mappings for the
logical directory; this is where files get their names, which means ext4
inodes do not themselves have names, since they can be linked (present)
multiple times with different names. Directories can store entries in two
different ways:
1) Classical linear directories: They store entries as a mostly-linked
mostly-list of EXT4_DIR_ENTRY.
2) Hash tree directories: These are used for larger directories, with
hundreds of entries, and are designed in a backwards-compatible way.
These are not yet implemented in the Ext4Dxe driver.

7) Journal
Ext3/4 filesystems have a journal to help protect the filesystem against
system crashes. This is not yet implemented in Ext4Dxe but is described
in detail in the Linux kernel's documentation.

The EDK2 implementation of ext4 is based only on the public documentation
available at
https://www.kernel.org/doc/html/latest/filesystems/ext4/index.html
and
the FreeBSD ext2fs driver (available at
https://github.com/freebsd/freebsd-src/tree/main/sys/fs/ext2fs,
BSD-2-Clause-FreeBSD licensed). It is licensed as
SPDX-License-Identifier: BSD-2-Clause-Patent.

After a brief discussion with the community, the proposed package
location is edk2-platform/Features/Ext4Pkg
(relevant discussion: https://edk2.groups.io/g/devel/topic/83060185).

I was the main contributor and I would like to maintain the package in
the future, if possible.

Current limitations:
1) The Ext4Dxe driver is, at the moment, read-only.
2) The Ext4Dxe driver at the moment cannot mount older (ext2/3)
filesystems. Ensuring compatibility with
those may not be a bad idea.

I intend to test the package using the UEFI SCTs present in edk2-test,
and implement any other needed unit tests myself using the already
available unit test framework. I also intend to (privately) fuzz the
UEFI driver with bad/unusual disk images, to improve the security and
reliability of the driver.

In the future, ext4 write support should be added so edk2 has a
fully-featured RW ext4 driver. There could also be a focus on
supporting the older ext4-like filesystems, as I mentioned in the
limitations, but that is open for discussion.

The driver's handling of unclean unmounting through forced shutdown is
unclear.
Is there a position in edk2 on how to handle such cases? I don't think
FAT32 has a "this filesystem is/was dirty" and even though it seems to
me that stopping a system from booting/opening the partition because
"we may find some tiny irregularities" is not the best course of
action, I can't find a clear answer.

The driver also had to add implementations of CRC32C and CRC16, and
after talking with my mentor we quickly reached the conclusion that
these may be good candidates for inclusion in MdePkg. We also
discussed moving the Ucs2 <-> Utf8 conversion library in RedfishPkg
(BaseUcs2Utf8Lib) into MdePkg as well. Any comments?
Current MdePkg BaseLib has CalculateCrc32(). So, CRC32C and CRC16 can be added into BaseLib.
I agree BaseLib is as good location for these 2 APIs.


If more modules need to consume Ucs2 <-> Utf8 conversion library, BaseUcs2Utf8Lib is generic enough
to be placed in MdePkg.
This was discussed with the RedfishPkg maintainers and was deferred until there was another use
case. Looks like EXT4 is a 2nd use case, so it is a good time to move to this lib class and
lib instance from RedfishPkg to MdePkg.


Thanks
Liming

Feel free to ask any questions you may find relevant.

Best Regards,

Pedro Falcato









Re: [PATCH V2 4/4] OvmfPkg/ResetVector: Update ResetVector to support Tdx

Lendacky, Thomas
 

On 7/22/21 12:52 AM, Min Xu wrote:
RFC: https://bugzilla.tianocore.org/show_bug.cgi?id=3429

In Tdx all CPUs "reset" to run on 32-bit protected mode with flat
descriptor (paging disabled). But in Non-Td guest the initial state of
CPUs is 16-bit real mode. To resolve this conflict, BITS 16/32 is used
in the very beginning of ResetVector. It will check the 32-bit protected
mode or 16-bit real mode, then jump to the corresponding entry point.
This is done in OvmfPkg/ResetVector/Ia16/ResetVectorVtf0.asm.

ReloadFlat32.asm load the GDT and set the CR0, then jump to Flat-32 mode.

InitTdx.asm is called to record the Tdx signature ('TDXG') and other tdx
information in a TDX_WORK_AREA which can be used by the other routines in
ResetVector.

Init32.asm is 32-bit initialization code in OvmfPkg. It puts above
ReloadFlat32 and InitTdx together to do the initializaiton for Tdx.

After that Tdx jumps to 64-bit long mode by doing following tasks:
1. SetCr3ForPageTables64
For OVMF, some initial page tables is built at:
PcdOvmfSecPageTablesBase - (PcdOvmfSecPageTablesBase + 0x6000)
This page table supports the 4-level page table.
But Tdx support 4-level and 5-level page table based on the CPU GPA width.
48bit is 4-level paging, 52-bit is 5-level paging.
If 5-level page table is supported (GPAW is 52), then a top level
page directory pointers (1 * 256TB entry) is generated in the
TdxPageTable.
2. Set Cr4
Enable PAE.
3. Adjust Cr3
If GPAW is 48, then Cr3 is PT_ADDR (0). If GPAW is 52, then Cr3 is
TDX_PT_ADDR (0).

Tdx MailBox [0x10, 0x800] is reserved for OS. So we initialize piece of this
area ([0x10, 0x20]) to record the Tdx flag ('TDXG') and other Tdx info so that
they can be used in the following flow.

After all above is successfully done, Tdx jump to SecEntry.

Cc: Ard Biesheuvel <ardb+tianocore@...>
Cc: Brijesh Singh <brijesh.singh@...>
Cc: Erdem Aktas <erdemaktas@...>
Cc: James Bottomley <jejb@...>
Cc: Jiewen Yao <jiewen.yao@...>
Cc: Tom Lendacky <thomas.lendacky@...>
Signed-off-by: Min Xu <min.m.xu@...>
---
OvmfPkg/ResetVector/Ia16/ResetVectorVtf0.asm | 21 ++++++++
OvmfPkg/ResetVector/Ia32/Flat32ToFlat64.asm | 47 ++++++++++++++++
OvmfPkg/ResetVector/Ia32/Init32.asm | 34 ++++++++++++
OvmfPkg/ResetVector/Ia32/InitTdx.asm | 57 ++++++++++++++++++++
OvmfPkg/ResetVector/Ia32/PageTables64.asm | 41 ++++++++++++++
OvmfPkg/ResetVector/Ia32/ReloadFlat32.asm | 44 +++++++++++++++
OvmfPkg/ResetVector/ResetVector.nasmb | 18 +++++++
7 files changed, 262 insertions(+)
create mode 100644 OvmfPkg/ResetVector/Ia32/Init32.asm
create mode 100644 OvmfPkg/ResetVector/Ia32/InitTdx.asm
create mode 100644 OvmfPkg/ResetVector/Ia32/ReloadFlat32.asm

diff --git a/OvmfPkg/ResetVector/Ia16/ResetVectorVtf0.asm b/OvmfPkg/ResetVector/Ia16/ResetVectorVtf0.asm
index ac86ce69ebe8..a390ed81d021 100644
--- a/OvmfPkg/ResetVector/Ia16/ResetVectorVtf0.asm
+++ b/OvmfPkg/ResetVector/Ia16/ResetVectorVtf0.asm
@@ -155,10 +155,31 @@ resetVector:
;
; This is where the processor will begin execution
;
+; In IA32 we follow the standard reset vector flow. While in X64, Td guest
+; may be supported. Td guest requires the startup mode to be 32-bit
+; protected mode but the legacy VM startup mode is 16-bit real mode.
+; To make NASM generate such shared entry code that behaves correctly in
+; both 16-bit and 32-bit mode, more BITS directives are added.
+;
+%ifdef ARCH_IA32
+
nop
nop
jmp EarlyBspInitReal16

+%else
+
+ smsw ax
+ test al, 1
+ jz .Real
+BITS 32
+ jmp Main32
+BITS 16
+.Real:
+ jmp EarlyBspInitReal16
+
+%endif
+
ALIGN 16

fourGigabytes:
diff --git a/OvmfPkg/ResetVector/Ia32/Flat32ToFlat64.asm b/OvmfPkg/ResetVector/Ia32/Flat32ToFlat64.asm
index c6d0d898bcd1..2206ca719593 100644
--- a/OvmfPkg/ResetVector/Ia32/Flat32ToFlat64.asm
+++ b/OvmfPkg/ResetVector/Ia32/Flat32ToFlat64.asm
@@ -17,6 +17,9 @@ Transition32FlatTo64Flat:

OneTimeCall SetCr3ForPageTables64

+ cmp dword[TDX_WORK_AREA], 0x47584454 ; 'TDXG'
+ jz TdxTransition32FlatTo64Flat
+
Is the memory area guaranteed to be zeroed for legacy guests? Hopefully,
this won't trip up a non-TDX guest with a false match (highly unlikely,
though).

mov eax, cr4
bts eax, 5 ; enable PAE
mov cr4, eax
@@ -65,10 +68,54 @@ EnablePaging:
bts eax, 31 ; set PG
mov cr0, eax ; enable paging

+ jmp _jumpTo64Bit
+
+;
+; Tdx Transition from 32Flat to 64Flat
+;
+TdxTransition32FlatTo64Flat:
+
+ mov eax, cr4
+ bts eax, 5 ; enable PAE
+
+ ;
+ ; byte[TDX_WORK_AREA_PAGELEVEL5] holds the indicator whether 52bit is supported.
+ ; if it is the case, need to set LA57 and use 5-level paging
+ ;
+ cmp byte[TDX_WORK_AREA_PAGELEVEL5], 0
+ jz .set_cr4
+ bts eax, 12
+.set_cr4:
+ mov cr4, eax
+ mov ebx, cr3
+
+ ;
+ ; if la57 is not set, we are ok
+ ; if using 5-level paging, adjust top-level page directory
+ ;
+ bt eax, 12
+ jnc .set_cr3
+ mov ebx, TDX_PT_ADDR (0)
+.set_cr3:
+ mov cr3, ebx
+
+ mov eax, cr0
+ bts eax, 31 ; set PG
+ mov cr0, eax ; enable paging
If you clear ebx here...

+
+_jumpTo64Bit:
jmp LINEAR_CODE64_SEL:ADDR_OF(jumpTo64BitAndLandHere)
+
BITS 64
jumpTo64BitAndLandHere:

+ ;
+ ; For Td guest we are done and jump to the end
+ ;
+ mov eax, TDX_WORK_AREA
+ cmp dword [eax], 0x47584454 ; 'TDXG'
+ jz GoodCompare
+
... you can remove these instructions. You'll jump to InsnCompare and that
check should succeed, right?

Thanks,
Tom

;
; Check if the second step of the SEV-ES mitigation is to be performed.
;


Re: [PATCH] UefiCpuPkg VTF0 X64: Build page tables using 1-GByte Page Granularity

Ashraf Ali S
 

Hi. Ray
Based on Dov Murik <dovmurik@...> Comments to take the python script changes separately,
I have filed the Bugzilla for that separately.
https://bugzilla.tianocore.org/show_bug.cgi?id=3506

verified the binary. More details are in Bugzilla.

Regards,
Ashraf Ali S
Intel Technology India Pvt. Ltd.

-----Original Message-----
From: Ni, Ray <ray.ni@...>
Sent: Wednesday, July 21, 2021 3:00 PM
To: Dov Murik <dovmurik@...>; Ard Biesheuvel <ardb@...>; Brijesh Singh <brijesh.singh@...>; James Bottomley <jejb@...>; Erdem Aktas <erdemaktas@...>; Tom Lendacky <thomas.lendacky@...>; Xu, Min M <min.m.xu@...>
Cc: S, Ashraf Ali <ashraf.ali.s@...>; devel@edk2.groups.io; Ard Biesheuvel <ardb+tianocore@...>; Justen, Jordan L <jordan.l.justen@...>; Agyeman, Prince <prince.agyeman@...>; Kumar, Rahul1 <rahul1.kumar@...>; De, Debkumar <debkumar.de@...>; Han, Harry <harry.han@...>; West, Catharine <catharine.west@...>; V, Sangeetha <sangeetha.v@...>
Subject: RE: [PATCH] UefiCpuPkg VTF0 X64: Build page tables using 1-GByte Page Granularity

OVMF's ResetVector is including the UefiCpuPkg's ResetVector. So, OVMF owners please do evaluate the impact.

I think this change assumes platform owner knows which format of page table should be chosen in build time.

-----Original Message-----
From: Dov Murik <dovmurik@...>
Sent: Tuesday, July 20, 2021 4:02 AM
To: Ard Biesheuvel <ardb@...>; Ni, Ray <ray.ni@...>; Brijesh Singh <brijesh.singh@...>; James Bottomley <jejb@...>; Erdem Aktas <erdemaktas@...>; Tom Lendacky <thomas.lendacky@...>
Cc: S, Ashraf Ali <ashraf.ali.s@...>; devel@edk2.groups.io; Ard Biesheuvel <ardb+tianocore@...>; Justen, Jordan L <jordan.l.justen@...>; Agyeman, Prince <prince.agyeman@...>; Kumar, Rahul1 <rahul1.kumar@...>; De, Debkumar <debkumar.de@...>; Han, Harry <harry.han@...>; West, Catharine <catharine.west@...>; V, Sangeetha <sangeetha.v@...>
Subject: Re: [PATCH] UefiCpuPkg VTF0 X64: Build page tables using 1-GByte Page Granularity



On 19/07/2021 10:09, Ard Biesheuvel wrote:
On Mon, 19 Jul 2021 at 05:14, Ni, Ray <ray.ni@...> wrote:

This change generates the reset vector binary which only contains 1G page table. If a platform doesn't support 1G page table, this will cause system hang.

To Ard and Jordan,
Can you evaluate whether this change impacts OVMF?
I don't have a clue, sorry, and I wouldn't know where to begin looking.

Brijesh, Dov, James, Erdem: after Laszlo's sudden departure, I will be
needing help reviewing OVMF patches that are highly specific to
SEV/SNP or x86 in general.
Adding Tom too - I think he modified the OVMF reset vector lately and might know.


Please take a look.

I'm not an expert, but I think that OVMF has its own reset vector in OvmfPkg/ResetVector, and therefore the changes in uefiCpuPkg will not affect OVMF.


Regarding the patch itself:

(1) I suggest separating the python tooling changes to one patch, verifying that the new python scripts generate the same binary files as the original python scripts. Then add another patch which introduces the reset vector changes.

(2) Do all x64 CPUs support 1 GB pages? Is it always enabled? Do we need to check this capability somewhere?


-Dov




To Prince,
Can you evaluate whether this change impacts SimicsOpenBoardPkg?

Thanks,
Ray

-----Original Message-----
From: S, Ashraf Ali <ashraf.ali.s@...>
Sent: Friday, July 2, 2021 8:25 PM
To: devel@edk2.groups.io
Cc: S, Ashraf Ali <ashraf.ali.s@...>; Ni, Ray
<ray.ni@...>; Kumar, Rahul1 <rahul1.kumar@...>; De,
Debkumar <debkumar.de@...>; Han, Harry <harry.han@...>;
West, Catharine <catharine.west@...>; V, Sangeetha
<sangeetha.v@...>
Subject: [PATCH] UefiCpuPkg VTF0 X64: Build page tables using 1-GByte
Page Granularity

REF:https://bugzilla.tianocore.org/show_bug.cgi?id=3473

X64 Reset Vector Code can access the memory range till 4GB using the Linear-Address Translation to a 2-MByte Page, when user wants to use more than 4G using 2M Page it will leads to use more number of Page table entries. using the 1-GByte Page table user can use more than 4G Memory by reducing the page table entries using 1-GByte Page, this patch attached can access memory range till 512GByte.
Build Scrips for Reset Vector currently based on Python 2 which is already EOL, needs to modify the build script based on Python 3, update the Binary accordingly.

Cc: Ray Ni <ray.ni@...>
Cc: Rahul Kumar <rahul1.kumar@...>
Cc: Debkumar De <debkumar.de@...>
Cc: Harry Han <harry.han@...>
Cc: Catharine West <catharine.west@...>
Cc: Sangeetha V <sangeetha.v@...>
Signed-off-by: Ashraf Ali S <ashraf.ali.s@...>
---
.../Vtf0/Bin/ResetVector.ia32.port80.raw | Bin 516 -> 484 bytes
.../ResetVector/Vtf0/Bin/ResetVector.ia32.raw | Bin 484 -> 468 bytes
.../Vtf0/Bin/ResetVector.ia32.serial.raw | Bin 884 -> 868 bytes
.../Vtf0/Bin/ResetVector.x64.port80.raw | Bin 28676 -> 12292 bytes
.../ResetVector/Vtf0/Bin/ResetVector.x64.raw | Bin 28676 -> 12292 bytes
.../Vtf0/Bin/ResetVector.x64.serial.raw | Bin 28676 -> 12292 bytes
UefiCpuPkg/ResetVector/Vtf0/Build.py | 11 +--
.../ResetVector/Vtf0/Ia32/PageTables64.asm | 2 +-
UefiCpuPkg/ResetVector/Vtf0/ReadMe.txt | 2 +-
.../Vtf0/Tools/FixupForRawSection.py | 4 +-
UefiCpuPkg/ResetVector/Vtf0/Vtf0.nasmb | 4 +-
.../ResetVector/Vtf0/X64/1GPageTables.asm | 64 ++++++++++++++++++
.../X64/{PageTables.asm => 2MPageTables.asm} | 0
13 files changed, 77 insertions(+), 10 deletions(-) create mode
100644 UefiCpuPkg/ResetVector/Vtf0/X64/1GPageTables.asm
rename UefiCpuPkg/ResetVector/Vtf0/X64/{PageTables.asm =>
2MPageTables.asm} (100%)

diff --git
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diff --git a/UefiCpuPkg/ResetVector/Vtf0/Build.py
b/UefiCpuPkg/ResetVector/Vtf0/Build.py
index 343c53b5ff..29f29ff0c2 100644
--- a/UefiCpuPkg/ResetVector/Vtf0/Build.py
+++ b/UefiCpuPkg/ResetVector/Vtf0/Build.py
@@ -1,7 +1,7 @@
## @file
# Automate the process of building the various reset vector types
# -# Copyright (c) 2009, Intel Corporation. All rights reserved.<BR>
+# Copyright (c) 2009 - 2021, Intel Corporation. All rights
+reserved.<BR>
#
# SPDX-License-Identifier: BSD-2-Clause-Patent # @@ -32,16 +32,19 @@ for arch in ('ia32', 'x64'):
'-o', output,
'Vtf0.nasmb',
)
+ print(f"Command : {' '.join(commandLine)}")
ret = RunCommand(commandLine)
- print '\tASM\t' + output
- if ret != 0: sys.exit(ret)
+ if ret != 0:
+ print(f"something went wrong while executing the {commandLine[-1]}")
+ sys.exit()
+ print('\tASM\t' + output)

commandLine = (
'python',
'Tools/FixupForRawSection.py',
output,
)
- print '\tFIXUP\t' + output
+ print('\tFIXUP\t' + output)
ret = RunCommand(commandLine)
if ret != 0: sys.exit(ret)

diff --git a/UefiCpuPkg/ResetVector/Vtf0/Ia32/PageTables64.asm
b/UefiCpuPkg/ResetVector/Vtf0/Ia32/PageTables64.asm
index 87a4125d4b..9cc6f56c17 100644
--- a/UefiCpuPkg/ResetVector/Vtf0/Ia32/PageTables64.asm
+++ b/UefiCpuPkg/ResetVector/Vtf0/Ia32/PageTables64.asm
@@ -15,7 +15,7 @@ BITS 32
SetCr3ForPageTables64:

;
- ; These pages are built into the ROM image in X64/PageTables.asm
+ ; These pages are built into the ROM image in
+ X64/1GPageTables.asm
;
mov eax, ADDR_OF(TopLevelPageDirectory)
mov cr3, eax
diff --git a/UefiCpuPkg/ResetVector/Vtf0/ReadMe.txt
b/UefiCpuPkg/ResetVector/Vtf0/ReadMe.txt
index e6e5b54243..eb9dd24ee2 100644
--- a/UefiCpuPkg/ResetVector/Vtf0/ReadMe.txt
+++ b/UefiCpuPkg/ResetVector/Vtf0/ReadMe.txt
@@ -29,7 +29,7 @@ EBP/RBP - Pointer to the start of the Boot Firmware
Volume === HOW TO BUILD VTF0 ===

Dependencies:
-* Python 2.5~2.7
+* Python 3.0 or newer
* Nasm 2.03 or newer

To rebuild the VTF0 binaries:
diff --git a/UefiCpuPkg/ResetVector/Vtf0/Tools/FixupForRawSection.py
b/UefiCpuPkg/ResetVector/Vtf0/Tools/FixupForRawSection.py
index c77438a0ce..de771eba22 100644
--- a/UefiCpuPkg/ResetVector/Vtf0/Tools/FixupForRawSection.py
+++ b/UefiCpuPkg/ResetVector/Vtf0/Tools/FixupForRawSection.py
@@ -1,7 +1,7 @@
## @file
# Apply fixup to VTF binary image for FFS Raw section # -#
Copyright (c) 2008, Intel Corporation. All rights reserved.<BR>
+# Copyright (c) 2008 - 2021, Intel Corporation. All rights
+reserved.<BR>
#
# SPDX-License-Identifier: BSD-2-Clause-Patent # @@ -15,6 +15,6 @@ c = ((len(d) + 4 + 7) & ~7) - 4 if c > len(d):
c -= len(d)
f = open(sys.argv[1], 'wb')
- f.write('\x90' * c)
+ f.write(b'\x90' * c)
f.write(d)
f.close()
diff --git a/UefiCpuPkg/ResetVector/Vtf0/Vtf0.nasmb
b/UefiCpuPkg/ResetVector/Vtf0/Vtf0.nasmb
index 493738c79c..0625efc456 100644
--- a/UefiCpuPkg/ResetVector/Vtf0/Vtf0.nasmb
+++ b/UefiCpuPkg/ResetVector/Vtf0/Vtf0.nasmb
@@ -2,7 +2,7 @@
; @file
; This file includes all other code files to assemble the reset
vector code ; -; Copyright (c) 2008 - 2013, Intel Corporation. All
rights reserved.<BR>
+; Copyright (c) 2008 - 2021, Intel Corporation. All rights
+reserved.<BR>
; SPDX-License-Identifier: BSD-2-Clause-Patent ;

;--------------------------------------------------------------------
----------
@@ -36,7 +36,7 @@
%include "PostCodes.inc"

%ifdef ARCH_X64
-%include "X64/PageTables.asm"
+%include "X64/1GPageTables.asm"
%endif

%ifdef DEBUG_PORT80
diff --git a/UefiCpuPkg/ResetVector/Vtf0/X64/1GPageTables.asm
b/UefiCpuPkg/ResetVector/Vtf0/X64/1GPageTables.asm
new file mode 100644
index 0000000000..8ae6c4c98c
--- /dev/null
+++ b/UefiCpuPkg/ResetVector/Vtf0/X64/1GPageTables.asm
@@ -0,0 +1,64 @@
+;-------------------------------------------------------------------
+---
+--------
+; @file
+; Emits Page Tables for 1:1 mapping of the addresses 0 -
+0x8000000000
+(512GB) ; ; Copyright (c) 2021, Intel Corporation. All rights
+reserved.<BR> ; SPDX-License-Identifier: BSD-2-Clause-Patent ;
+Linear-Address Translation to a 1-GByte Page ;
+;-------------------------------------------------------------------
+---
+--------
+
+BITS 64
+
+%define ALIGN_TOP_TO_4K_FOR_PAGING
+
+%define PAGE_PRESENT 0x01
+%define PAGE_READ_WRITE 0x02
+%define PAGE_USER_SUPERVISOR 0x04
+%define PAGE_WRITE_THROUGH 0x08
+%define PAGE_CACHE_DISABLE 0x010
+%define PAGE_ACCESSED 0x020
+%define PAGE_DIRTY 0x040
+%define PAGE_PAT 0x080
+%define PAGE_GLOBAL 0x0100
+%define PAGE_1G 0x80
+
+%define PAGE_PDP_ATTR (PAGE_ACCESSED + \
+ PAGE_READ_WRITE + \
+ PAGE_PRESENT)
+
+%define PAGE_PDP_1G_ATTR (PAGE_ACCESSED + \
+ PAGE_READ_WRITE + \
+ PAGE_PRESENT + \
+ PAGE_1G)
+
+%define PGTBLS_OFFSET(x) ((x) - TopLevelPageDirectory) %define
+PGTBLS_ADDR(x) (ADDR_OF(TopLevelPageDirectory) + (x))
+
+%define PDP(offset) (ADDR_OF(TopLevelPageDirectory) + (offset) + \
+ PAGE_PDP_ATTR)
+
+%define PDP_1G(x) ((x << 30) + PAGE_PDP_1G_ATTR)
+
+ALIGN 16
+
+TopLevelPageDirectory:
+
+ ;
+ ; Top level Page Directory Pointers (1 * 512GB entry)
+ ;
+ DQ PDP(0x1000)
+
+
+ TIMES 0x1000-PGTBLS_OFFSET($) DB 0
+ ;
+ ; Next level Page Directory Pointers (512 * 1GB entries => 512GB)
+ ;
+%assign i 0
+%rep 512
+ DQ PDP_1G(i)
+ %assign i i+1
+%endrep
+
+
+EndOfPageTables:
diff --git a/UefiCpuPkg/ResetVector/Vtf0/X64/PageTables.asm
b/UefiCpuPkg/ResetVector/Vtf0/X64/2MPageTables.asm
similarity index 100%
rename from UefiCpuPkg/ResetVector/Vtf0/X64/PageTables.asm
rename to UefiCpuPkg/ResetVector/Vtf0/X64/2MPageTables.asm
--
2.32.0.windows.1


Re: RFC: EXT4 filesystem driver

Pedro Falcato
 

Hi Andrew, Marvin,

RE: The package name: It doesn't sound like a bad idea to have
something like a FileSystemPkg and have a bunch of different
filesystems inside of it, but I'll defer to you
and my mentors' judgement; we could also drop that issue for now and
take care of it afterwards, since it may need further changes that are
not a part of GSoC and would just delay the process.

With respect to the write capabilities of the driver, I'm not entirely
sure whether or not it's useful. I've been thinking about it today,
and it seems like there's not much that could go wrong? The write path
isn't excessively complex. Except of course in the event of an
untimely power cut, but those /should/ be easily detected by the
checksums. My initial idea was to have it up to speed with FatPkg and
other filesystems by implementing all of EFI_FILE_PROTOCOL, including
the write portions. If Apple's HFS+ and APFS drivers don't have those,
it may be a decent idea to reduce the scope of the ext4 driver as
well. I don't see a big need for write support; on the other hand,
I've only worked on UEFI bootloaders before, which may be an outlier
in that regard. Further feedback is appreciated.

As for the tests, UEFI SCTs already seem to have some tests on
EFI_FILE_PROTOCOL's. Further testing may require some sort of fuzzing,
which is what I want to, although in a
simplified way. With fuzzing we could hammer the filesystem code with
all sorts of different calls in different orders, we could also mutate
the disk structures to test if the driver is secure and
can handle corruption in a nice, safe way. A future (GSoC or not)
project could also attempt to use compiler-generated coverage
instrumentation (see LLVM's LibFuzzer and SanitizerCoverage for an
example).

I'm not sure about all OSes, but at least Linux ext2/3/4 drivers are
very robust and can handle and work around any corrupted FS I
(accidentally) throw at them. However, running fsck is the best way to
detect corruption; note that licensing may be an issue as, for
example, ext4's fsck is GPL2 licensed.

Best Regards,
Pedro

On Thu, 22 Jul 2021 at 16:58, Andrew Fish <afish@...> wrote:



On Jul 22, 2021, at 3:24 AM, Marvin Häuser <mhaeuser@...> wrote:

On 22.07.21 01:12, Pedro Falcato wrote:

EXT4 (fourth extended filesystem) is a filesystem developed for Linux
that has been in wide use (desktops, servers, smartphones) since 2008.

The Ext4Pkg implements the Simple File System Protocol for a partition
that is formatted with the EXT4 file system. This allows UEFI Drivers,
UEFI Applications, UEFI OS Loaders, and the UEFI Shell to access files
on an EXT4 partition and supports booting a UEFI OS Loader from an
EXT4 partition.
This project is one of the TianoCore Google Summer of Code projects.

Right now, Ext4Pkg only contains a single member, Ext4Dxe, which is a
UEFI driver that consumes Block I/O, Disk I/O and (optionally) Disk
I/O 2 Protocols, and produces the Simple File System protocol. It
allows mounting ext4 filesystems exclusively.

Brief overhead of EXT4:
Layout of an EXT2/3/4 filesystem:
(note: this driver has been developed using
https://www.kernel.org/doc/html/latest/filesystems/ext4/index.html as
documentation).

An ext2/3/4 filesystem (here on out referred to as simply an ext4 filesystem,
due to the similarities) is composed of various concepts:

1) Superblock
The superblock is the structure near (1024 bytes offset from the start)
the start of the partition, and describes the filesystem in general.
Here, we get to know the size of the filesystem's blocks, which features
it supports or not, whether it's been cleanly unmounted, how many blocks
we have, etc.

2) Block groups
EXT4 filesystems are divided into block groups, and each block group covers
s_blocks_per_group(8 * Block Size) blocks. Each block group has an
associated block group descriptor; these are present directly after the
superblock. Each block group descriptor contains the location of the
inode table, and the inode and block bitmaps (note these bitmaps are only
a block long, which gets us the 8 * Block Size formula covered previously).

3) Blocks
The ext4 filesystem is divided into blocks, of size s_log_block_size ^ 1024.
Blocks can be allocated using individual block groups's bitmaps. Note
that block 0 is invalid and its presence on extents/block tables means
it's part of a file hole, and that particular location must be read as
a block full of zeros.

4) Inodes
The ext4 filesystem divides files/directories into inodes (originally
index nodes). Each file/socket/symlink/directory/etc (here on out referred
to as a file, since there is no distinction under the ext4 filesystem) is
stored as a /nameless/ inode, that is stored in some block group's inode
table. Each inode has s_inode_size size (or GOOD_OLD_INODE_SIZE if it's
an old filesystem), and holds various metadata about the file. Since the
largest inode structure right now is ~160 bytes, the rest of the inode
contains inline extended attributes. Inodes' data is stored using either
data blocks (under ext2/3) or extents (under ext4).

5) Extents
Ext4 inodes store data in extents. These let N contiguous logical blocks
that are represented by N contiguous physical blocks be represented by a
single extent structure, which minimizes filesystem metadata bloat and
speeds up block mapping (particularly due to the fact that high-quality
ext4 implementations like linux's try /really/ hard to make the file
contiguous, so it's common to have files with almost 0 fragmentation).
Inodes that use extents store them in a tree, and the top of the tree
is stored on i_data. The tree's leaves always start with an
EXT4_EXTENT_HEADER and contain EXT4_EXTENT_INDEX on eh_depth != 0 and
EXT4_EXTENT on eh_depth = 0; these entries are always sorted by logical
block.

6) Directories
Ext4 directories are files that store name -> inode mappings for the
logical directory; this is where files get their names, which means ext4
inodes do not themselves have names, since they can be linked (present)
multiple times with different names. Directories can store entries in two
different ways:
1) Classical linear directories: They store entries as a mostly-linked
mostly-list of EXT4_DIR_ENTRY.
2) Hash tree directories: These are used for larger directories, with
hundreds of entries, and are designed in a backwards-compatible way.
These are not yet implemented in the Ext4Dxe driver.

7) Journal
Ext3/4 filesystems have a journal to help protect the filesystem against
system crashes. This is not yet implemented in Ext4Dxe but is described
in detail in the Linux kernel's documentation.

The EDK2 implementation of ext4 is based only on the public documentation
available at https://www.kernel.org/doc/html/latest/filesystems/ext4/index.html
and
the FreeBSD ext2fs driver (available at
https://github.com/freebsd/freebsd-src/tree/main/sys/fs/ext2fs,
BSD-2-Clause-FreeBSD licensed). It is licensed as
SPDX-License-Identifier: BSD-2-Clause-Patent.

After a brief discussion with the community, the proposed package
location is edk2-platform/Features/Ext4Pkg
(relevant discussion: https://edk2.groups.io/g/devel/topic/83060185).

I was the main contributor and I would like to maintain the package in
the future, if possible.


While I personally don't like it's outside of the EDK II core, I kind of get it. However I would strongly suggest to choose a more general package name, like "LinuxFsPkg", or "NixFsPkg", or maybe even just "FileSystemPkg" (and move FAT over some day?). Imagine someone wants to import BTRFS next year, should it really be "BtrfsPkg"? I understand it follows the "FatPkg" convention, but I feel like people forget FatPkg was special as to its awkward license before Microsoft allowed a change a few years ago. Maintainers.txt already has the concept of different Reviewers per subfolder, maybe it could be extended a little to have a common EDK II contributor to officially maintain the package, but have you be a Maintainer or something like a Reviewer+ to your driver? Or you could maintain the entire package of course.


Marvin,

Good point that the FatPkg was more about license boundary than anything else, so I’m not opposed to a more generic package name.

Current limitations:
1) The Ext4Dxe driver is, at the moment, read-only.
2) The Ext4Dxe driver at the moment cannot mount older (ext2/3)
filesystems. Ensuring compatibility with
those may not be a bad idea.

I intend to test the package using the UEFI SCTs present in edk2-test,
and implement any other needed unit tests myself using the already
available unit test framework. I also intend to (privately) fuzz the
UEFI driver with bad/unusual disk images, to improve the security and
reliability of the driver.

In the future, ext4 write support should be added so edk2 has a
fully-featured RW ext4 driver. There could also be a focus on
supporting the older ext4-like filesystems, as I mentioned in the
limitations, but that is open for discussion.


I may be alone, but I strongly object. One of our projects (OpenCore) has a disgusting way of writing files because the FAT32 driver in Aptio IV firmwares may corrupt the filesystem when resizing files. To be honest, it may corrupt with other usages too and we never noticed, because basically we wrote the code to require the least amount of (complex) FS operations.

The issue with EDK II is, there is a lot of own code and a lot of users, but little testing. By that I do not mean that developers do not test their code, but that nobody sits down and performs all sorts of FS manipulations in all sorts of orders and closely observes the result for regression-testing. Users will not really test it either, as UEFI to them should just somehow boot to Windows. If at least the code was shared with a codebase that is known-trusted (e.g. the Linux kernel itself), that'd be much easier to trust, but realistically this is not going to happen.
My point is, if a company like AMI cannot guarantee writing does not damage the FS for a very simple FS, how do you plan to guarantee yours doesn't for a much more complex FS? I'd rather have only one simple FS type that supports writing for most use-cases (e.g. logging).

At the very least I would beg you to have a PCD to turn write support off - if it will be off by default, that'd be great of course. :)
Was there any discussion yet as to why write support is needed in the first place you could point me to?


I think having a default PCD option of read only is a good idea.

EFI on Mac carries HFS+ and APFS EFI file system drivers and both of those are read only for safety, security, and to avoid the need to validate them. So I think some products may want to have the option to ship read only versions of the file system.

Seems like having EFI base file system tests would be useful. I’d imaging with OVMF it would be possible to implement a very robust test infrastructure. Seems like the hard bits would be generating the test cases and figuring out how to validate the tests did the correct thing. I’m guess the OS based file system drivers are robust and try to work around bugs gracefully? Maybe there is a way to turn on OS logging, or even run an OS based fsck on the volume after the tests complete. Regardless this seems like an interesting project, maybe we can add it to next years GSoC?

Thanks,

Andrew Fish

Thanks for your work!

Best regards,
Marvin

The driver's handling of unclean unmounting through forced shutdown is unclear.
Is there a position in edk2 on how to handle such cases? I don't think
FAT32 has a "this filesystem is/was dirty" and even though it seems to
me that stopping a system from booting/opening the partition because
"we may find some tiny irregularities" is not the best course of
action, I can't find a clear answer.

The driver also had to add implementations of CRC32C and CRC16, and
after talking with my mentor we quickly reached the conclusion that
these may be good candidates for inclusion in MdePkg. We also
discussed moving the Ucs2 <-> Utf8 conversion library in RedfishPkg
(BaseUcs2Utf8Lib) into MdePkg as well. Any comments?

Feel free to ask any questions you may find relevant.

Best Regards,

Pedro Falcato









--
Pedro Falcato


Re: [PATCH] UefiCpuPkg: ResetVector Tool Support for Python 3

Michael D Kinney
 

Hi Ashraf,

Why would an update to the Python script to Python3 cause any changes to the
binary images the script produces.

If they are different, then that would seem to imply that the change was
not compatible from a behavior perspective.

Mike

-----Original Message-----
From: devel@edk2.groups.io <devel@edk2.groups.io> On Behalf Of Ashraf Ali S
Sent: Thursday, July 22, 2021 9:41 AM
To: devel@edk2.groups.io
Cc: S, Ashraf Ali <ashraf.ali.s@...>; Ni, Ray <ray.ni@...>; Kumar, Rahul1 <rahul1.kumar@...>; De,
Debkumar <debkumar.de@...>; Han, Harry <harry.han@...>; West, Catharine <catharine.west@...>; V,
Sangeetha <sangeetha.v@...>
Subject: [edk2-devel] [PATCH] UefiCpuPkg: ResetVector Tool Support for Python 3

[edk2-devel] [PATCH]
REF:https://bugzilla.tianocore.org/show_bug.cgi?id=3506

Build Scrips for Reset Vector currently based on Python 2
which is already EOL, needs to modify the build script based on
Python 3, update the Binary accordingly.

Change-Id: I2cfef08177951f2f29ee168ac4a9de9b10769ea1
Cc: Ray Ni <ray.ni@...>
Cc: Rahul Kumar <rahul1.kumar@...>
Cc: Debkumar De <debkumar.de@...>
Cc: Harry Han <harry.han@...>
Cc: Catharine West <catharine.west@...>
Cc: Sangeetha V <sangeetha.v@...>
Signed-off-by: Ashraf Ali S <ashraf.ali.s@...>
---
.../Vtf0/Bin/ResetVector.ia32.port80.raw | Bin 516 -> 484 bytes
.../ResetVector/Vtf0/Bin/ResetVector.ia32.raw | Bin 484 -> 468 bytes
.../Vtf0/Bin/ResetVector.ia32.serial.raw | Bin 884 -> 868 bytes
.../Vtf0/Bin/ResetVector.x64.port80.raw | Bin 28676 -> 28676 bytes
.../ResetVector/Vtf0/Bin/ResetVector.x64.raw | Bin 28676 -> 28676 bytes
.../Vtf0/Bin/ResetVector.x64.serial.raw | Bin 28676 -> 28676 bytes
UefiCpuPkg/ResetVector/Vtf0/Build.py | 11 +++++++----
.../Vtf0/Tools/FixupForRawSection.py | 4 ++--
8 files changed, 9 insertions(+), 6 deletions(-)

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diff --git a/UefiCpuPkg/ResetVector/Vtf0/Bin/ResetVector.x64.raw b/UefiCpuPkg/ResetVector/Vtf0/Bin/ResetVector.x64.raw
index a78d5b407c8a106c221af127216d073cf8fdb99d..865846da42a45c16b69746f16963d47a6c6e71b0 100644
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diff --git a/UefiCpuPkg/ResetVector/Vtf0/Bin/ResetVector.x64.serial.raw
b/UefiCpuPkg/ResetVector/Vtf0/Bin/ResetVector.x64.serial.raw
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diff --git a/UefiCpuPkg/ResetVector/Vtf0/Build.py b/UefiCpuPkg/ResetVector/Vtf0/Build.py
index 343c53b5ff..29f29ff0c2 100644
--- a/UefiCpuPkg/ResetVector/Vtf0/Build.py
+++ b/UefiCpuPkg/ResetVector/Vtf0/Build.py
@@ -1,7 +1,7 @@
## @file
# Automate the process of building the various reset vector types
#
-# Copyright (c) 2009, Intel Corporation. All rights reserved.<BR>
+# Copyright (c) 2009 - 2021, Intel Corporation. All rights reserved.<BR>
#
# SPDX-License-Identifier: BSD-2-Clause-Patent
#
@@ -32,16 +32,19 @@ for arch in ('ia32', 'x64'):
'-o', output,
'Vtf0.nasmb',
)
+ print(f"Command : {' '.join(commandLine)}")
ret = RunCommand(commandLine)
- print '\tASM\t' + output
- if ret != 0: sys.exit(ret)
+ if ret != 0:
+ print(f"something went wrong while executing the {commandLine[-1]}")
+ sys.exit()
+ print('\tASM\t' + output)

commandLine = (
'python',
'Tools/FixupForRawSection.py',
output,
)
- print '\tFIXUP\t' + output
+ print('\tFIXUP\t' + output)
ret = RunCommand(commandLine)
if ret != 0: sys.exit(ret)

diff --git a/UefiCpuPkg/ResetVector/Vtf0/Tools/FixupForRawSection.py
b/UefiCpuPkg/ResetVector/Vtf0/Tools/FixupForRawSection.py
index c77438a0ce..de771eba22 100644
--- a/UefiCpuPkg/ResetVector/Vtf0/Tools/FixupForRawSection.py
+++ b/UefiCpuPkg/ResetVector/Vtf0/Tools/FixupForRawSection.py
@@ -1,7 +1,7 @@
## @file
# Apply fixup to VTF binary image for FFS Raw section
#
-# Copyright (c) 2008, Intel Corporation. All rights reserved.<BR>
+# Copyright (c) 2008 - 2021, Intel Corporation. All rights reserved.<BR>
#
# SPDX-License-Identifier: BSD-2-Clause-Patent
#
@@ -15,6 +15,6 @@ c = ((len(d) + 4 + 7) & ~7) - 4
if c > len(d):
c -= len(d)
f = open(sys.argv[1], 'wb')
- f.write('\x90' * c)
+ f.write(b'\x90' * c)
f.write(d)
f.close()
--
2.30.2.windows.1





[PATCH] UefiCpuPkg: ResetVector Tool Support for Python 3

Ashraf Ali S
 

[edk2-devel] [PATCH]
REF:https://bugzilla.tianocore.org/show_bug.cgi?id=3506

Build Scrips for Reset Vector currently based on Python 2
which is already EOL, needs to modify the build script based on
Python 3, update the Binary accordingly.

Change-Id: I2cfef08177951f2f29ee168ac4a9de9b10769ea1
Cc: Ray Ni <ray.ni@...>
Cc: Rahul Kumar <rahul1.kumar@...>
Cc: Debkumar De <debkumar.de@...>
Cc: Harry Han <harry.han@...>
Cc: Catharine West <catharine.west@...>
Cc: Sangeetha V <sangeetha.v@...>
Signed-off-by: Ashraf Ali S <ashraf.ali.s@...>
---
.../Vtf0/Bin/ResetVector.ia32.port80.raw | Bin 516 -> 484 bytes
.../ResetVector/Vtf0/Bin/ResetVector.ia32.raw | Bin 484 -> 468 bytes
.../Vtf0/Bin/ResetVector.ia32.serial.raw | Bin 884 -> 868 bytes
.../Vtf0/Bin/ResetVector.x64.port80.raw | Bin 28676 -> 28676 bytes
.../ResetVector/Vtf0/Bin/ResetVector.x64.raw | Bin 28676 -> 28676 bytes
.../Vtf0/Bin/ResetVector.x64.serial.raw | Bin 28676 -> 28676 bytes
UefiCpuPkg/ResetVector/Vtf0/Build.py | 11 +++++++----
.../Vtf0/Tools/FixupForRawSection.py | 4 ++--
8 files changed, 9 insertions(+), 6 deletions(-)

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diff --git a/UefiCpuPkg/ResetVector/Vtf0/Bin/ResetVector.ia32.serial.raw b/UefiCpuPkg/ResetVector/Vtf0/Bin/ResetVector.ia32.serial.raw
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diff --git a/UefiCpuPkg/ResetVector/Vtf0/Bin/ResetVector.x64.serial.raw b/UefiCpuPkg/ResetVector/Vtf0/Bin/ResetVector.x64.serial.raw
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zi<`}1{Cz!>i^a|6FuqmK<YIBNIgGpYOfD8To5T1AdL|c(o6TYTLp_s=#m(k0{*j)^
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diff --git a/UefiCpuPkg/ResetVector/Vtf0/Build.py b/UefiCpuPkg/ResetVector/Vtf0/Build.py
index 343c53b5ff..29f29ff0c2 100644
--- a/UefiCpuPkg/ResetVector/Vtf0/Build.py
+++ b/UefiCpuPkg/ResetVector/Vtf0/Build.py
@@ -1,7 +1,7 @@
## @file
# Automate the process of building the various reset vector types
#
-# Copyright (c) 2009, Intel Corporation. All rights reserved.<BR>
+# Copyright (c) 2009 - 2021, Intel Corporation. All rights reserved.<BR>
#
# SPDX-License-Identifier: BSD-2-Clause-Patent
#
@@ -32,16 +32,19 @@ for arch in ('ia32', 'x64'):
'-o', output,
'Vtf0.nasmb',
)
+ print(f"Command : {' '.join(commandLine)}")
ret = RunCommand(commandLine)
- print '\tASM\t' + output
- if ret != 0: sys.exit(ret)
+ if ret != 0:
+ print(f"something went wrong while executing the {commandLine[-1]}")
+ sys.exit()
+ print('\tASM\t' + output)

commandLine = (
'python',
'Tools/FixupForRawSection.py',
output,
)
- print '\tFIXUP\t' + output
+ print('\tFIXUP\t' + output)
ret = RunCommand(commandLine)
if ret != 0: sys.exit(ret)

diff --git a/UefiCpuPkg/ResetVector/Vtf0/Tools/FixupForRawSection.py b/UefiCpuPkg/ResetVector/Vtf0/Tools/FixupForRawSection.py
index c77438a0ce..de771eba22 100644
--- a/UefiCpuPkg/ResetVector/Vtf0/Tools/FixupForRawSection.py
+++ b/UefiCpuPkg/ResetVector/Vtf0/Tools/FixupForRawSection.py
@@ -1,7 +1,7 @@
## @file
# Apply fixup to VTF binary image for FFS Raw section
#
-# Copyright (c) 2008, Intel Corporation. All rights reserved.<BR>
+# Copyright (c) 2008 - 2021, Intel Corporation. All rights reserved.<BR>
#
# SPDX-License-Identifier: BSD-2-Clause-Patent
#
@@ -15,6 +15,6 @@ c = ((len(d) + 4 + 7) & ~7) - 4
if c > len(d):
c -= len(d)
f = open(sys.argv[1], 'wb')
- f.write('\x90' * c)
+ f.write(b'\x90' * c)
f.write(d)
f.close()
--
2.30.2.windows.1


Re: RFC: EXT4 filesystem driver

Marvin Häuser <mhaeuser@...>
 

On 22.07.21 17:58, Andrew Fish wrote:


On Jul 22, 2021, at 3:24 AM, Marvin Häuser <mhaeuser@... <mailto:mhaeuser@...>> wrote:

On 22.07.21 01:12, Pedro Falcato wrote:
EXT4 (fourth extended filesystem) is a filesystem developed for Linux
that has been in wide use (desktops, servers, smartphones) since 2008.

The Ext4Pkg implements the Simple File System Protocol for a partition
that is formatted with the EXT4 file system. This allows UEFI Drivers,
UEFI Applications, UEFI OS Loaders, and the UEFI Shell to access files
on an EXT4 partition and supports booting a UEFI OS Loader from an
EXT4 partition.
This project is one of the TianoCore Google Summer of Code projects.

Right now, Ext4Pkg only contains a single member, Ext4Dxe, which is a
UEFI driver that consumes Block I/O, Disk I/O and (optionally) Disk
I/O 2 Protocols, and produces the Simple File System protocol. It
allows mounting ext4 filesystems exclusively.

Brief overhead of EXT4:
Layout of an EXT2/3/4 filesystem:
(note: this driver has been developed using
https://www.kernel.org/doc/html/latest/filesystems/ext4/index.html <https://www.kernel.org/doc/html/latest/filesystems/ext4/index.html> as
documentation).

An ext2/3/4 filesystem (here on out referred to as simply an ext4 filesystem,
due to the similarities) is composed of various concepts:

1) Superblock
The superblock is the structure near (1024 bytes offset from the start)
the start of the partition, and describes the filesystem in general.
Here, we get to know the size of the filesystem's blocks, which features
it supports or not, whether it's been cleanly unmounted, how many blocks
we have, etc.

2) Block groups
EXT4 filesystems are divided into block groups, and each block group covers
s_blocks_per_group(8 * Block Size) blocks. Each block group has an
associated block group descriptor; these are present directly after the
superblock. Each block group descriptor contains the location of the
inode table, and the inode and block bitmaps (note these bitmaps are only
a block long, which gets us the 8 * Block Size formula covered previously).

3) Blocks
The ext4 filesystem is divided into blocks, of size s_log_block_size ^ 1024.
Blocks can be allocated using individual block groups's bitmaps. Note
that block 0 is invalid and its presence on extents/block tables means
it's part of a file hole, and that particular location must be read as
a block full of zeros.

4) Inodes
The ext4 filesystem divides files/directories into inodes (originally
index nodes). Each file/socket/symlink/directory/etc (here on out referred
to as a file, since there is no distinction under the ext4 filesystem) is
stored as a /nameless/ inode, that is stored in some block group's inode
table. Each inode has s_inode_size size (or GOOD_OLD_INODE_SIZE if it's
an old filesystem), and holds various metadata about the file. Since the
largest inode structure right now is ~160 bytes, the rest of the inode
contains inline extended attributes. Inodes' data is stored using either
data blocks (under ext2/3) or extents (under ext4).

5) Extents
Ext4 inodes store data in extents. These let N contiguous logical blocks
that are represented by N contiguous physical blocks be represented by a
single extent structure, which minimizes filesystem metadata bloat and
speeds up block mapping (particularly due to the fact that high-quality
ext4 implementations like linux's try /really/ hard to make the file
contiguous, so it's common to have files with almost 0 fragmentation).
Inodes that use extents store them in a tree, and the top of the tree
is stored on i_data. The tree's leaves always start with an
EXT4_EXTENT_HEADER and contain EXT4_EXTENT_INDEX on eh_depth != 0 and
EXT4_EXTENT on eh_depth = 0; these entries are always sorted by logical
block.

6) Directories
Ext4 directories are files that store name -> inode mappings for the
logical directory; this is where files get their names, which means ext4
inodes do not themselves have names, since they can be linked (present)
multiple times with different names. Directories can store entries in two
different ways:
1) Classical linear directories: They store entries as a mostly-linked
mostly-list of EXT4_DIR_ENTRY.
2) Hash tree directories: These are used for larger directories, with
hundreds of entries, and are designed in a backwards-compatible way.
These are not yet implemented in the Ext4Dxe driver.

7) Journal
Ext3/4 filesystems have a journal to help protect the filesystem against
system crashes. This is not yet implemented in Ext4Dxe but is described
in detail in the Linux kernel's documentation.

The EDK2 implementation of ext4 is based only on the public documentation
available at https://www.kernel.org/doc/html/latest/filesystems/ext4/index.html <https://www.kernel.org/doc/html/latest/filesystems/ext4/index.html>
and
the FreeBSD ext2fs driver (available at
https://github.com/freebsd/freebsd-src/tree/main/sys/fs/ext2fs <https://github.com/freebsd/freebsd-src/tree/main/sys/fs/ext2fs>,
BSD-2-Clause-FreeBSD licensed). It is licensed as
SPDX-License-Identifier: BSD-2-Clause-Patent.

After a brief discussion with the community, the proposed package
location is edk2-platform/Features/Ext4Pkg
(relevant discussion: https://edk2.groups.io/g/devel/topic/83060185 <https://edk2.groups.io/g/devel/topic/83060185>).

I was the main contributor and I would like to maintain the package in
the future, if possible.
While I personally don't like it's outside of the EDK II core, I kind of get it. However I would strongly suggest to choose a more general package name, like "LinuxFsPkg", or "NixFsPkg", or maybe even just "FileSystemPkg" (and move FAT over some day?). Imagine someone wants to import BTRFS next year, should it really be "BtrfsPkg"? I understand it follows the "FatPkg" convention, but I feel like people forget FatPkg was special as to its awkward license before Microsoft allowed a change a few years ago. Maintainers.txt already has the concept of different Reviewers per subfolder, maybe it could be extended a little to have a common EDK II contributor to officially maintain the package, but have you be a Maintainer or something like a Reviewer+ to your driver? Or you could maintain the entire package of course.
Marvin,

Good point that the FatPkg was more about license boundary than anything else, so I’m not opposed to a more generic package name.

Current limitations:
1) The Ext4Dxe driver is, at the moment, read-only.
2) The Ext4Dxe driver at the moment cannot mount older (ext2/3)
filesystems. Ensuring compatibility with
those may not be a bad idea.

I intend to test the package using the UEFI SCTs present in edk2-test,
and implement any other needed unit tests myself using the already
available unit test framework. I also intend to (privately) fuzz the
UEFI driver with bad/unusual disk images, to improve the security and
reliability of the driver.

In the future, ext4 write support should be added so edk2 has a
fully-featured RW ext4 driver. There could also be a focus on
supporting the older ext4-like filesystems, as I mentioned in the
limitations, but that is open for discussion.
I may be alone, but I strongly object. One of our projects (OpenCore) has a disgusting way of writing files because the FAT32 driver in Aptio IV firmwares may corrupt the filesystem when resizing files. To be honest, it may corrupt with other usages too and we never noticed, because basically we wrote the code to require the least amount of (complex) FS operations.

The issue with EDK II is, there is a lot of own code and a lot of users, but little testing. By that I do not mean that developers do not test their code, but that nobody sits down and performs all sorts of FS manipulations in all sorts of orders and closely observes the result for regression-testing. Users will not really test it either, as UEFI to them should just somehow boot to Windows. If at least the code was shared with a codebase that is known-trusted (e.g. the Linux kernel itself), that'd be much easier to trust, but realistically this is not going to happen.
My point is, if a company like AMI cannot guarantee writing does not damage the FS for a very simple FS, how do you plan to guarantee yours doesn't for a much more complex FS? I'd rather have only one simple FS type that supports writing for most use-cases (e.g. logging).

At the very least I would beg you to have a PCD to turn write support off - if it will be off by default, that'd be great of course. :)
Was there any discussion yet as to why write support is needed in the first place you could point me to?
I think having a default PCD option of read only is a good idea.

EFI on Mac carries HFS+ and APFS EFI file system drivers and both of those are read only for safety, security, and to avoid the need to validate them. So I think some products may want to have the option to ship read only versions of the file system.

Seems like having EFI base file system tests would be useful. I’d imaging with OVMF it would be possible to implement a very robust test infrastructure. Seems like the hard bits would be generating the test cases and figuring out how to validate the tests did the correct thing. I’m guess the OS based file system drivers are robust and try to work around bugs gracefully? Maybe there is a way to turn on OS logging, or even run an OS based fsck on the volume after the tests complete. Regardless this seems like an interesting project, maybe we can add it to next years GSoC?
Great idea, maybe it could be added to that wiki list of topic suggestions (preferably close to the top)? :)

Best regards,
Marvin


Thanks,

Andrew Fish

Thanks for your work!

Best regards,
Marvin

The driver's handling of unclean unmounting through forced shutdown is unclear.
Is there a position in edk2 on how to handle such cases? I don't think
FAT32 has a "this filesystem is/was dirty" and even though it seems to
me that stopping a system from booting/opening the partition because
"we may find some tiny irregularities" is not the best course of
action, I can't find a clear answer.

The driver also had to add implementations of CRC32C and CRC16, and
after talking with my mentor we quickly reached the conclusion that
these may be good candidates for inclusion in MdePkg. We also
discussed moving the Ucs2 <-> Utf8 conversion library in RedfishPkg
(BaseUcs2Utf8Lib) into MdePkg as well. Any comments?

Feel free to ask any questions you may find relevant.

Best Regards,

Pedro Falcato






Re: RFC: EXT4 filesystem driver

Andrew Fish
 



On Jul 22, 2021, at 3:24 AM, Marvin Häuser <mhaeuser@...> wrote:

On 22.07.21 01:12, Pedro Falcato wrote:
EXT4 (fourth extended filesystem) is a filesystem developed for Linux
that has been in wide use (desktops, servers, smartphones) since 2008.

The Ext4Pkg implements the Simple File System Protocol for a partition
that is formatted with the EXT4 file system. This allows UEFI Drivers,
UEFI Applications, UEFI OS Loaders, and the UEFI Shell to access files
on an EXT4 partition and supports booting a UEFI OS Loader from an
EXT4 partition.
This project is one of the TianoCore Google Summer of Code projects.

Right now, Ext4Pkg only contains a single member, Ext4Dxe, which is a
UEFI driver that consumes Block I/O, Disk I/O and (optionally) Disk
I/O 2 Protocols, and produces the Simple File System protocol. It
allows mounting ext4 filesystems exclusively.

Brief overhead of EXT4:
Layout of an EXT2/3/4 filesystem:
(note: this driver has been developed using
https://www.kernel.org/doc/html/latest/filesystems/ext4/index.html as
documentation).

An ext2/3/4 filesystem (here on out referred to as simply an ext4 filesystem,
due to the similarities) is composed of various concepts:

1) Superblock
The superblock is the structure near (1024 bytes offset from the start)
the start of the partition, and describes the filesystem in general.
Here, we get to know the size of the filesystem's blocks, which features
it supports or not, whether it's been cleanly unmounted, how many blocks
we have, etc.

2) Block groups
EXT4 filesystems are divided into block groups, and each block group covers
s_blocks_per_group(8 * Block Size) blocks. Each block group has an
associated block group descriptor; these are present directly after the
superblock. Each block group descriptor contains the location of the
inode table, and the inode and block bitmaps (note these bitmaps are only
a block long, which gets us the 8 * Block Size formula covered previously).

3) Blocks
The ext4 filesystem is divided into blocks, of size s_log_block_size ^ 1024.
Blocks can be allocated using individual block groups's bitmaps. Note
that block 0 is invalid and its presence on extents/block tables means
it's part of a file hole, and that particular location must be read as
a block full of zeros.

4) Inodes
The ext4 filesystem divides files/directories into inodes (originally
index nodes). Each file/socket/symlink/directory/etc (here on out referred
to as a file, since there is no distinction under the ext4 filesystem) is
stored as a /nameless/ inode, that is stored in some block group's inode
table. Each inode has s_inode_size size (or GOOD_OLD_INODE_SIZE if it's
an old filesystem), and holds various metadata about the file. Since the
largest inode structure right now is ~160 bytes, the rest of the inode
contains inline extended attributes. Inodes' data is stored using either
data blocks (under ext2/3) or extents (under ext4).

5) Extents
Ext4 inodes store data in extents. These let N contiguous logical blocks
that are represented by N contiguous physical blocks be represented by a
single extent structure, which minimizes filesystem metadata bloat and
speeds up block mapping (particularly due to the fact that high-quality
ext4 implementations like linux's try /really/ hard to make the file
contiguous, so it's common to have files with almost 0 fragmentation).
Inodes that use extents store them in a tree, and the top of the tree
is stored on i_data. The tree's leaves always start with an
EXT4_EXTENT_HEADER and contain EXT4_EXTENT_INDEX on eh_depth != 0 and
EXT4_EXTENT on eh_depth = 0; these entries are always sorted by logical
block.

6) Directories
Ext4 directories are files that store name -> inode mappings for the
logical directory; this is where files get their names, which means ext4
inodes do not themselves have names, since they can be linked (present)
multiple times with different names. Directories can store entries in two
different ways:
1) Classical linear directories: They store entries as a mostly-linked
mostly-list of EXT4_DIR_ENTRY.
2) Hash tree directories: These are used for larger directories, with
hundreds of entries, and are designed in a backwards-compatible way.
These are not yet implemented in the Ext4Dxe driver.

7) Journal
Ext3/4 filesystems have a journal to help protect the filesystem against
system crashes. This is not yet implemented in Ext4Dxe but is described
in detail in the Linux kernel's documentation.

The EDK2 implementation of ext4 is based only on the public documentation
available at https://www.kernel.org/doc/html/latest/filesystems/ext4/index.html
and
the FreeBSD ext2fs driver (available at
https://github.com/freebsd/freebsd-src/tree/main/sys/fs/ext2fs,
BSD-2-Clause-FreeBSD licensed). It is licensed as
SPDX-License-Identifier: BSD-2-Clause-Patent.

After a brief discussion with the community, the proposed package
location is edk2-platform/Features/Ext4Pkg
(relevant discussion: https://edk2.groups.io/g/devel/topic/83060185).

I was the main contributor and I would like to maintain the package in
the future, if possible.

While I personally don't like it's outside of the EDK II core, I kind of get it. However I would strongly suggest to choose a more general package name, like "LinuxFsPkg", or "NixFsPkg", or maybe even just "FileSystemPkg" (and move FAT over some day?). Imagine someone wants to import BTRFS next year, should it really be "BtrfsPkg"? I understand it follows the "FatPkg" convention, but I feel like people forget FatPkg was special as to its awkward license before Microsoft allowed a change a few years ago. Maintainers.txt already has the concept of different Reviewers per subfolder, maybe it could be extended a little to have a common EDK II contributor to officially maintain the package, but have you be a Maintainer or something like a Reviewer+ to your driver? Or you could maintain the entire package of course.


Marvin,

Good point that the FatPkg was more about license boundary than anything else, so I’m not opposed to a more generic package name. 

Current limitations:
1) The Ext4Dxe driver is, at the moment, read-only.
2) The Ext4Dxe driver at the moment cannot mount older (ext2/3)
filesystems. Ensuring compatibility with
those may not be a bad idea.

I intend to test the package using the UEFI SCTs present in edk2-test,
and implement any other needed unit tests myself using the already
available unit test framework. I also intend to (privately) fuzz the
UEFI driver with bad/unusual disk images, to improve the security and
reliability of the driver.

In the future, ext4 write support should be added so edk2 has a
fully-featured RW ext4 driver. There could also be a focus on
supporting the older ext4-like filesystems, as I mentioned in the
limitations, but that is open for discussion.

I may be alone, but I strongly object. One of our projects (OpenCore) has a disgusting way of writing files because the FAT32 driver in Aptio IV firmwares may corrupt the filesystem when resizing files. To be honest, it may corrupt with other usages too and we never noticed, because basically we wrote the code to require the least amount of (complex) FS operations.

The issue with EDK II is, there is a lot of own code and a lot of users, but little testing. By that I do not mean that developers do not test their code, but that nobody sits down and performs all sorts of FS manipulations in all sorts of orders and closely observes the result for regression-testing. Users will not really test it either, as UEFI to them should just somehow boot to Windows. If at least the code was shared with a codebase that is known-trusted (e.g. the Linux kernel itself), that'd be much easier to trust, but realistically this is not going to happen.
My point is, if a company like AMI cannot guarantee writing does not damage the FS for a very simple FS, how do you plan to guarantee yours doesn't for a much more complex FS? I'd rather have only one simple FS type that supports writing for most use-cases (e.g. logging).

At the very least I would beg you to have a PCD to turn write support off - if it will be off by default, that'd be great of course. :)
Was there any discussion yet as to why write support is needed in the first place you could point me to?


I think having a default PCD option of read only is a good idea. 

EFI on Mac carries HFS+ and APFS EFI file system drivers and both of those are read only for safety, security, and to avoid the need to validate them. So I think some products may want to have the option to ship read only versions of the file system. 

Seems like having EFI base file system tests would be useful. I’d imaging with OVMF it would be possible to implement a very robust test infrastructure. Seems like the hard bits would be generating the test cases and figuring out how to validate the tests did the correct thing. I’m guess the OS based file system drivers are robust and try to work around bugs gracefully? Maybe there is a way to turn on OS logging, or even run an OS based fsck on the volume after the tests complete. Regardless this seems like an interesting project, maybe we can add it to next years GSoC?

Thanks,

Andrew Fish

Thanks for your work!

Best regards,
Marvin

The driver's handling of unclean unmounting through forced shutdown is unclear.
Is there a position in edk2 on how to handle such cases? I don't think
FAT32 has a "this filesystem is/was dirty" and even though it seems to
me that stopping a system from booting/opening the partition because
"we may find some tiny irregularities" is not the best course of
action, I can't find a clear answer.

The driver also had to add implementations of CRC32C and CRC16, and
after talking with my mentor we quickly reached the conclusion that
these may be good candidates for inclusion in MdePkg. We also
discussed moving the Ucs2 <-> Utf8 conversion library in RedfishPkg
(BaseUcs2Utf8Lib) into MdePkg as well. Any comments?

Feel free to ask any questions you may find relevant.

Best Regards,

Pedro Falcato









Re: ArmVirt and Self-Updating Code

Ard Biesheuvel
 

On Thu, 22 Jul 2021 at 16:54, Bret Barkelew <Bret.Barkelew@...> wrote:

Expanding audience to the full dev list…

See below…



- Bret



From: Thomas Abraham
Sent: Wednesday, July 7, 2021 11:07 PM
To: Bret Barkelew; Ard Biesheuvel (TianoCore); Lindholm, Leif; Laszlo Ersek; Marvin Häuser; Sami Mujawar
Cc: nd
Subject: [EXTERNAL] RE: ArmVirt and Self-Updating Code



+ Sami



From: Bret Barkelew <Bret.Barkelew@...>
Sent: Thursday, July 8, 2021 11:05 AM
To: Thomas Abraham <thomas.abraham@...>; Ard Biesheuvel (TianoCore) <ardb+tianocore@...>; Lindholm, Leif <leif@...>; Laszlo Ersek <lersek@...>; Marvin Häuser <mhaeuser@...>
Subject: ArmVirt and Self-Updating Code



All,



Marvin asked me a question on the UEFI Talkbox Discord that’s a little beyond my ken…



“There is self-relocating code in ArmVirtPkg:

https://github.com/tianocore/edk2/blob/17143c4837393d42c484b42d1789b85b2cff1aaf/ArmVirtPkg/PrePi/PrePi.c#L133-L165

According to comments in the ASM, it seems like this is for Linux-based RAM boot (I saw further stuff for KVM, so it makes sense I guess?). It seems unfortunate it cannot be mapped into a known address range so that self-relocation is not necessary, but that's out of my scope to understand.
"Mapping" implies that the MMU is on, but this code boots with the MMU
off. Unlike x86, ARM does not define any physical address ranges that
are guaranteed to be backed by DRAM, so a portable image either needs
to be fully position independent, or carry the metadata it needs to
relocate itself as it is invoked.



“Now, StandaloneMmPkg has similar (self-)relocation code too: https://github.com/tianocore/edk2/blob/17143c4837393d42c484b42d1789b85b2cff1aaf/StandaloneMmPkg/Library/StandaloneMmCoreEntryPoint/AArch64/StandaloneMmCoreEntryPoint.c#L379-L386

Because I cannot find such elsewhere, I assume it must be for the same ARM virtualised environment as above.
No.

The binary it applies the Relocations to is documented to be the Standalone MM core, but in fact SecCore is located:

https://github.com/tianocore/edk2/blob/17143c4837393d42c484b42d1789b85b2cff1aaf/StandaloneMmPkg/Library/StandaloneMmCoreEntryPoint/AArch64/SetPermissions.c#L131-L158



“This yields the following questions to me:

1) What even invokes Standalone MM on ARM? It is documented it is spawned during SEC, but I could not find any actual invocation.
It is not spawned by the normal world code that runs UEFI. It is a
secure world component that runs in a completely different execution
context (TrustZone). The code does run with the MMU enabled from the
start, but running from an a priori fixed offset was considered to be
a security hazard, so we added self relocation support.

The alternative would have been to add metadata to the StMmCore
component that can be interpreted by the secure world component that
loads it, but this would go beyond any existing specs, and make
portability more problematic.

2) Why does Standalone MM (self-)relocation locate SecCore? Should it not already have been relocated with the code from ArmPlatformPkg? Is Standalone MM embedded into ARM SecCore?
No and no. Standalone MM has nothing to do with the code that runs as
part of UEFI itself. ArmPlatformPkg is completely separate from
StandaloneMmPkg.

3) Why is SecCore the only module relocated? Are all others guaranteed to be "properly" loaded?
SecCore contains a PE/COFF loader, so all subsequent modules are
loaded normally. This is similar to the ArmVirtQemuKernel
self-relocating SEC module, which only relocates itself in this
manner, and relies on standard PE/COFF metadata for loading other
modules.


4) Is there maybe some high-level documented about the ARM boot flow? It seems to be significantly different from the x86 routes quite vastly.”
trustedfirmware.org may have some useful documentation.



Hoping that one of you could get me closer to an answer for him. Also happy to take this to the greater mailing list, but thought I’d avoid churn.



Thanks in advance!

- Bret




Re: [staging/edk2-redfish-client Tools PATCH 6/6] RedfishClientPkg/Redfish-Profile-Simulator: Add requirements

Nickle Wang
 

Reviewed-by: Nickle Wang <nickle.wang@...>

Thanks,
Nickle


From: Chang, Abner (HPS SW/FW Technologist) <abner.chang@...>
Sent: Thursday, July 22, 2021 14:08
To: devel@edk2.groups.io <devel@edk2.groups.io>
Cc: Wang, Nickle (HPS SW) <nickle.wang@...>; Liming Gao <gaoliming@...>
Subject: [staging/edk2-redfish-client Tools PATCH 6/6] RedfishClientPkg/Redfish-Profile-Simulator: Add requirements
 
add requirements.txt for the required python module

Signed-off-by: Abner Chang <abner.chang@...>
Cc: Nickle Wang <nickle.wang@...>
Cc: Liming Gao <gaoliming@...>
---
 .../Tools/Redfish-Profile-Simulator/requirements.txt            | 2 ++
 1 file changed, 2 insertions(+)
 create mode 100644 RedfishClientPkg/Tools/Redfish-Profile-Simulator/requirements.txt

diff --git a/RedfishClientPkg/Tools/Redfish-Profile-Simulator/requirements.txt b/RedfishClientPkg/Tools/Redfish-Profile-Simulator/requirements.txt
new file mode 100644
index 0000000000..88807d87c2
--- /dev/null
+++ b/RedfishClientPkg/Tools/Redfish-Profile-Simulator/requirements.txt
@@ -0,0 +1,2 @@
+flask==1.1.1
+pyOpenSSL
--
2.17.1


Re: [staging/edk2-redfish-client Tools PATCH 5/6] RedfishClientPkg/Redfish-Profile-Simulator: Add ETAG on memory resource

Nickle Wang
 

Reviewed-by: Nickle Wang <nickle.wang@...>

Thanks,
Nickle


From: Chang, Abner (HPS SW/FW Technologist) <abner.chang@...>
Sent: Thursday, July 22, 2021 14:08
To: devel@edk2.groups.io <devel@edk2.groups.io>
Cc: Wang, Nickle (HPS SW) <nickle.wang@...>; Liming Gao <gaoliming@...>
Subject: [staging/edk2-redfish-client Tools PATCH 5/6] RedfishClientPkg/Redfish-Profile-Simulator: Add ETAG on memory resource
 
Add ETAG support on Memory resource.

Signed-off-by: Abner Chang <abner.chang@...>
Cc: Nickle Wang <nickle.wang@...>
Cc: Liming Gao <gaoliming@...>
---
 .../Redfish-Profile-Simulator/v1sim/systems.py      | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/RedfishClientPkg/Tools/Redfish-Profile-Simulator/v1sim/systems.py b/RedfishClientPkg/Tools/Redfish-Profile-Simulator/v1sim/systems.py
index 690101fb10..de4b839aeb 100644
--- a/RedfishClientPkg/Tools/Redfish-Profile-Simulator/v1sim/systems.py
+++ b/RedfishClientPkg/Tools/Redfish-Profile-Simulator/v1sim/systems.py
@@ -18,6 +18,7 @@ from .resource import RfResource, RfCollection
 from .storage import RfSimpleStorageCollection, RfSmartStorage
 import flask
 import json
+import hashlib
 from collections import OrderedDict
 
 class RfSystemsCollection(RfCollection):
@@ -142,13 +143,25 @@ class RfMemoryCollection(RfCollection):
         self.res_data["Members"].append({"@odata.id":newMemoryUrl})
 
         post_data["@odata.id"] = newMemoryUrl
+
+        md5 = hashlib.md5()
+        md5.update(json.dumps(post_data).encode("utf-8"))
+        etag_str = 'W/"' + md5.hexdigest() + '"'
+        post_data["@odata.etag"] = etag_str
         self.elements[str(newMemoryIdx)] = post_data
 
         resp = flask.Response(json.dumps(post_data,indent=4))
         resp.headers["Location"] = newMemoryUrl
+        resp.headers["ETag"] = etag_str
+
         return 0, 200, None, resp
 
     def patch_memory(self, Idx, patch_data):
+        md5 = hashlib.md5()
+        md5.update(json.dumps(patch_data).encode("utf-8"))
+        etag_str = 'W/"' + md5.hexdigest() + '"'
+        patch_data["@odata.etag"] = etag_str
+
         self.elements[str(Idx)] = {**self.elements[str(Idx)], **patch_data}
         resp = flask.Response(json.dumps(self.elements[str(Idx)],indent=4))
         return 0, 200, None, resp
--
2.17.1


Re: [staging/edk2-redfish-client Tools PATCH 4/6] RedfishClientPkg/Redfish-Profile-Simulator: HTTP methods on Memory Collection

Nickle Wang
 

Reviewed-by: Nickle Wang <nickle.wang@...>

Thanks,
Nickle


From: Chang, Abner (HPS SW/FW Technologist) <abner.chang@...>
Sent: Thursday, July 22, 2021 14:08
To: devel@edk2.groups.io <devel@edk2.groups.io>
Cc: Wang, Nickle (HPS SW) <nickle.wang@...>; Liming Gao <gaoliming@...>
Subject: [staging/edk2-redfish-client Tools PATCH 4/6] RedfishClientPkg/Redfish-Profile-Simulator: HTTP methods on Memory Collection
 
Add POST and PATCH methods on Memory collection and resource.

Signed-off-by: Abner Chang <abner.chang@...>
Cc: Nickle Wang <nickle.wang@...>
Cc: Liming Gao <gaoliming@...>
---
 .../v1sim/redfishURIs.py                      | 25 +++++++++++
 .../v1sim/systems.py                          | 43 +++++++++++++++++++
 2 files changed, 68 insertions(+)

diff --git a/RedfishClientPkg/Tools/Redfish-Profile-Simulator/v1sim/redfishURIs.py b/RedfishClientPkg/Tools/Redfish-Profile-Simulator/v1sim/redfishURIs.py
index 3c912f7ce1..35d3794cc6 100644
--- a/RedfishClientPkg/Tools/Redfish-Profile-Simulator/v1sim/redfishURIs.py
+++ b/RedfishClientPkg/Tools/Redfish-Profile-Simulator/v1sim/redfishURIs.py
@@ -1,6 +1,7 @@
 #
 # Copyright Notice:
 # Copyright (c) 2019, Intel Corporation. All rights reserved.<BR>
+# (C) Copyright 2021 Hewlett Packard Enterprise Development LP<BR>
 # SPDX-License-Identifier: BSD-2-Clause-Patent
 #
 # Copyright Notice:
@@ -308,6 +309,30 @@ def rfApi_SimpleServer(root, versions, host="127.0.0.1", port=5000, cert="", key
         else:
             return err_string, status_code
 
+    @app.route("/redfish/v1/Systems/<string:system_id>/Memory", methods=['POST'])
+    @auth.rfAuthRequired
+    def rf_computer_memory_post(system_id):
+        print ("in POST memory collection")
+        rdata = json.loads(request.data,object_pairs_hook=OrderedDict)
+        print("rdata:{}".format(rdata))
+        rc, status_code, err_string, resp = root.components['Systems'].get_element(system_id).components['Memory'].post_resource(rdata)
+        if rc == 0:
+            return resp, status_code
+        else:
+            return err_string, status_code
+
+    @app.route("/redfish/v1/Systems/<string:system_id>/Memory/<string:MemoryIdx>", methods=['PATCH'])
+    @auth.rfAuthRequired
+    def rf_computer_memory_patch(system_id, MemoryIdx):
+        print ("in PATCH memory[%s] resource" % MemoryIdx)
+        rdata = json.loads(request.data,object_pairs_hook=OrderedDict)
+        print("rdata:{}".format(rdata))
+        rc, status_code, err_string, resp = root.components['Systems'].get_element(system_id).components['Memory'].patch_memory(MemoryIdx, rdata)
+        if rc == 0:
+            return resp, status_code
+        else:
+            return err_string, status_code
+
     def resolve_path(service, path):
         parts = path.split('/')
         result = service
diff --git a/RedfishClientPkg/Tools/Redfish-Profile-Simulator/v1sim/systems.py b/RedfishClientPkg/Tools/Redfish-Profile-Simulator/v1sim/systems.py
index b8b3788054..690101fb10 100644
--- a/RedfishClientPkg/Tools/Redfish-Profile-Simulator/v1sim/systems.py
+++ b/RedfishClientPkg/Tools/Redfish-Profile-Simulator/v1sim/systems.py
@@ -2,6 +2,7 @@
 # Copyright Notice:
 #
 # Copyright (c) 2019, Intel Corporation. All rights reserved.<BR>
+# (C) Copyright 2021 Hewlett Packard Enterprise Development LP<BR>
 # SPDX-License-Identifier: BSD-2-Clause-Patent
 #
 # Copyright Notice:
@@ -123,9 +124,50 @@ class RfSystemObj(RfResource):
 
 # subclass Logs Collection
 class RfMemoryCollection(RfCollection):
+    def final_init_processing(self, base_path, rel_path):
+        self.maxIdx = self.res_data["Members@..."]
+
     def element_type(self):
         return RfMemory
 
+    def post_resource(self, post_data):
+        print("Members@...:{}".format(self.res_data["Members@..."]))
+        print("Members:{}".format(self.res_data["Members"]))
+        print("post_data:{}".format(post_data))
+
+        self.res_data["Members@..."] = self.res_data["Members@..."] + 1
+        self.maxIdx = self.maxIdx + 1
+        newMemoryIdx = self.maxIdx
+        newMemoryUrl = self.res_data["@odata.id"] + "/" + str(newMemoryIdx)
+        self.res_data["Members"].append({"@odata.id":newMemoryUrl})
+
+        post_data["@odata.id"] = newMemoryUrl
+        self.elements[str(newMemoryIdx)] = post_data
+
+        resp = flask.Response(json.dumps(post_data,indent=4))
+        resp.headers["Location"] = newMemoryUrl
+        return 0, 200, None, resp
+
+    def patch_memory(self, Idx, patch_data):
+        self.elements[str(Idx)] = {**self.elements[str(Idx)], **patch_data}
+        resp = flask.Response(json.dumps(self.elements[str(Idx)],indent=4))
+        return 0, 200, None, resp
+
+    def get_memory(self, Idx):
+        return json.dumps(self.elements[Idx],indent=4)
+
+    def delete_memory(self, Idx):
+        print("in delete_memory")
+
+        resp = flask.Response(json.dumps(self.elements[Idx],indent=4))
+
+        self.elements.pop(Idx)
+        self.res_data["Members@..."] = self.res_data["Members@..."] - 1
+
+        newMemoryUrl = self.res_data["@odata.id"] + "/" + str(Idx)
+        self.res_data["Members"].remove({"@odata.id":newMemoryUrl})
+        return 0, 200, None, resp
+
 
 class RfMemory(RfResource):
     pass
@@ -267,3 +309,4 @@ class RfBootOptionCollection(RfCollection):
         return 0, 200, None, resp
 
 class RfBootOption(RfResource):
+    pass
--
2.17.1


Re: ArmVirt and Self-Updating Code

Bret Barkelew <bret.barkelew@...>
 

Expanding audience to the full dev list…

See below…

 

- Bret

 

From: Thomas Abraham
Sent: Wednesday, July 7, 2021 11:07 PM
To: Bret Barkelew; Ard Biesheuvel (TianoCore); Lindholm, Leif; Laszlo Ersek; Marvin Häuser; Sami Mujawar
Cc: nd
Subject: [EXTERNAL] RE: ArmVirt and Self-Updating Code

 

+ Sami

 

From: Bret Barkelew <Bret.Barkelew@...>
Sent: Thursday, July 8, 2021 11:05 AM
To: Thomas Abraham <thomas.abraham@...>; Ard Biesheuvel (TianoCore) <ardb+tianocore@...>; Lindholm, Leif <leif@...>; Laszlo Ersek <lersek@...>; Marvin Häuser <mhaeuser@...>
Subject: ArmVirt and Self-Updating Code

 

All,

 

Marvin asked me a question on the UEFI Talkbox Discord that’s a little beyond my ken…

 

“There is self-relocating code in ArmVirtPkg:

https://github.com/tianocore/edk2/blob/17143c4837393d42c484b42d1789b85b2cff1aaf/ArmVirtPkg/PrePi/PrePi.c#L133-L165

According to comments in the ASM, it seems like this is for Linux-based RAM boot (I saw further stuff for KVM, so it makes sense I guess?). It seems unfortunate it cannot be mapped into a known address range so that self-relocation is not necessary, but that's out of my scope to understand.

 

“Now, StandaloneMmPkg has similar (self-)relocation code too: https://github.com/tianocore/edk2/blob/17143c4837393d42c484b42d1789b85b2cff1aaf/StandaloneMmPkg/Library/StandaloneMmCoreEntryPoint/AArch64/StandaloneMmCoreEntryPoint.c#L379-L386

Because I cannot find such elsewhere, I assume it must be for the same ARM virtualised environment as above. The binary it applies the Relocations to is documented to be the Standalone MM core, but in fact SecCore is located:

https://github.com/tianocore/edk2/blob/17143c4837393d42c484b42d1789b85b2cff1aaf/StandaloneMmPkg/Library/StandaloneMmCoreEntryPoint/AArch64/SetPermissions.c#L131-L158

 

“This yields the following questions to me:

1) What even invokes Standalone MM on ARM? It is documented it is spawned during SEC, but I could not find any actual invocation.

2) Why does Standalone MM (self-)relocation locate SecCore? Should it not already have been relocated with the code from ArmPlatformPkg? Is Standalone MM embedded into ARM SecCore?

3) Why is SecCore the only module relocated? Are all others guaranteed to be "properly" loaded?

4) Is there maybe some high-level documented about the ARM boot flow? It seems to be significantly different from the x86 routes quite vastly.”

 

Hoping that one of you could get me closer to an answer for him. Also happy to take this to the greater mailing list, but thought I’d avoid churn.

 

Thanks in advance!

- Bret

 

 


Re: [PATCH v1 6/6] UefiPayloadPkg: LinuxBoot: use a text format for the configuration block.

Cheng-Chieh Huang <chengchieh@...>
 


On Thu, Jul 22, 2021 at 1:09 AM Marvin Häuser <mhaeuser@...> wrote:


On 21.07.21 15:23, Cheng-Chieh Huang via groups.io wrote:
> From: Trammell Hudson <hudson@...>
>
> This adds a text command line for the UefiPayloadPkg that uses
> a textual magic number 'LnxBoot1' and a series of white-space
> separated key=value[,value...] pairs for the parameters.
>
> The v1 binary configuration structure is used if it is present instead
> for backwards compatability.
>
> Currently supported text command line arguments are are:
>
> * `serial=baud,base,width,type,hz,pci`
> (only `baud` needs to be specified, the rest have reasonable
> defaults)
>
> * `mem=start,end,type`
> Types are based on `/sys/firmware/memmaps/*/types`:
>      1 == "System RAM"
>      3 == "ACPI Tables"
>      4 == "ACPI Non-volatile Storage"
>      5 == "Reserved"
>
> * `ACPI20=base` pointer to RDSP (from `/sys/firmware/efi/systab`)
>
> * `SMBIOS=base` pointer to the SMBIOS table (also from the EFI table)
>
> Signed-off-by: Cheng-Chieh Huang <chengchieh@...>
> ---
>   UefiPayloadPkg/Include/Linuxboot.h             |  17 +-
>   UefiPayloadPkg/Library/LbParseLib/LbParseLib.c | 252 +++++++++++++++++---
>   2 files changed, 230 insertions(+), 39 deletions(-)
>
> diff --git a/UefiPayloadPkg/Include/Linuxboot.h b/UefiPayloadPkg/Include/Linuxboot.h
> index 34ca18069983..56b39b5a09ff 100644
> --- a/UefiPayloadPkg/Include/Linuxboot.h
> +++ b/UefiPayloadPkg/Include/Linuxboot.h
> @@ -24,8 +24,7 @@ typedef struct MemoryMapEntryStruct {
>     UINT32 Type;
>   } MemoryMapEntry;
>   
> -typedef struct UefiPayloadConfigStruct {
> -  UINT64 Version;
> +typedef struct {
>     UINT64 AcpiBase;
>     UINT64 AcpiSize;
>     UINT64 SmbiosBase;
> @@ -33,10 +32,22 @@ typedef struct UefiPayloadConfigStruct {
>     SerialPortConfig SerialConfig;
>     UINT32 NumMemoryMapEntries;
>     MemoryMapEntry MemoryMapEntries[0];
> +} UefiPayloadConfigV1;
> +
> +typedef struct UefiPayloadConfigStruct {
> +  UINT64 Version;
> +  union {
> +    UefiPayloadConfigV1 v1;
> +    struct {
> +      char cmdline[0]; // up to 64 KB
> +    } v2;
> +  } config;
>   } UefiPayloadConfig;
>   #pragma pack()
>   
> -#define UEFI_PAYLOAD_CONFIG_VERSION 1
> +// magic version config is "LnxBoot1"
> +#define UEFI_PAYLOAD_CONFIG_VERSION1 1
> +#define UEFI_PAYLOAD_CONFIG_VERSION2 0x31746f6f42786e4cULL
>   
>   #define LINUXBOOT_MEM_RAM 1
>   #define LINUXBOOT_MEM_DEFAULT 2
> diff --git a/UefiPayloadPkg/Library/LbParseLib/LbParseLib.c b/UefiPayloadPkg/Library/LbParseLib/LbParseLib.c
> index 34bfb6a1073f..5e68091cac91 100644
> --- a/UefiPayloadPkg/Library/LbParseLib/LbParseLib.c
> +++ b/UefiPayloadPkg/Library/LbParseLib/LbParseLib.c
> @@ -1,13 +1,12 @@
>   /** @file
> -  This library will parse the linuxboot table in memory and extract those required
> -  information.
> +  This library will parse the linuxboot table in memory and extract those
> +required information.
>   
>     Copyright (c) 2021, the u-root Authors. All rights reserved.<BR>
>     SPDX-License-Identifier: BSD-2-Clause-Patent
>   
>   **/
>   
> -
>   #include <IndustryStandard/Acpi.h>
>   #include <IndustryStandard/SmBios.h>
>   #include <Library/BaseLib.h>
> @@ -18,17 +17,42 @@
>   #include <Library/PcdLib.h>
>   #include <Linuxboot.h>
>   #include <Uefi/UefiBaseType.h>
> +#include <stdint.h>
> +#include <stdlib.h>
> +//#include <string.h>
> +//#include <ctype.h>
> +
> +#define strncmp(a, b, n) AsciiStrnCmp((a), (b), (n))
> +
> +static uint64_t parse_int(const char* s, char** end) {
> +  UINT64 x;
> +
> +  if (s[0] == '0' && s[1] == 'x')
> +    AsciiStrHexToUint64S(s, end, &x);
> +  else
> +    AsciiStrDecimalToUint64S(s, end, &x);
> +
> +  return x;
> +}
> +
> +static int isspace(const char c) { return c == ' ' || c == '\t' || c == '\n'; }
>   
>   // Retrieve UefiPayloadConfig from Linuxboot's uefiboot
> -UefiPayloadConfig* GetUefiPayLoadConfig() {
> -  UefiPayloadConfig* config =
> +const UefiPayloadConfig* GetUefiPayLoadConfig() {
> +  const UefiPayloadConfig* config =
>         (UefiPayloadConfig*)(UINTN)(PcdGet32(PcdPayloadFdMemBase) - SIZE_64KB);
> -  if (config->Version != UEFI_PAYLOAD_CONFIG_VERSION) {
> -    DEBUG((DEBUG_ERROR, "Expect payload config version: %d, but get %d\n",
> -           UEFI_PAYLOAD_CONFIG_VERSION, config->Version));
> -    CpuDeadLoop ();
> -  }
> -  return config;
> +
> +  if (config->Version == UEFI_PAYLOAD_CONFIG_VERSION1 ||
> +      config->Version == UEFI_PAYLOAD_CONFIG_VERSION2)
> +    return config;
> +
> +  DEBUG((DEBUG_ERROR,
> +         "Expect payload config version %016lx or %016lx, but get %016lx\n",
> +         UEFI_PAYLOAD_CONFIG_VERSION1, UEFI_PAYLOAD_CONFIG_VERSION2,
> +         config->Version));
> +  CpuDeadLoop();
> +  while (1)
> +    ;
>   }
>   
>   // Align the address and add memory rang to MemInfoCallback
> @@ -54,6 +78,57 @@ void AddMemoryRange(IN BL_MEM_INFO_CALLBACK MemInfoCallback, IN UINTN start,
>     MemInfoCallback(&MemoryMap, NULL);
>   }
>   
> +const char* cmdline_next(const char* cmdline, const char** option) {
> +  // at the end of the string, we're done
> +  if (!cmdline || *cmdline == '\0') return NULL;
> +
> +  // skip any leading whitespace
> +  while (isspace(*cmdline)) cmdline++;
> +
> +  // if we've hit the end of the string, we're done
> +  if (*cmdline == '\0') return NULL;
> +
> +  *option = cmdline;
> +
> +  // find the end of this option or the string
> +  while (!isspace(*cmdline) && *cmdline != '\0') cmdline++;
> +
> +  // cmdline points to the whitespace or end of string
> +  return cmdline;
> +}
> +
> +int cmdline_ints(const char* option, uint64_t args[], int max) {
> +  // skip any leading text up to an '='
> +  const char* s = option;
> +  while (1) {
> +    const char c = *s++;
> +    if (c == '=') break;
> +
> +    if (c == '\0' || isspace(c)) {
> +      s = option;
> +      break;
> +    }
> +  }
> +
> +  for (int i = 0; i < max; i++) {
> +    char* end;
> +    args[i] = parse_int(s, &end);
> +
> +    // end of string or end of the option?
> +    if (*end == '\0' || isspace(*end)) return i + 1;
> +
> +    // not separator? signal an error if we have consumed any ints,
> +    // otherwise return 0 saying that none were found
> +    if (*end != ',') return i == 0 ? 0 : -1;
> +
> +    // skip the , and get the next value
> +    s = end + 1;
> +  }
> +
> +  // too many values!
> +  return -1;
> +}
> +
>   /**
>     Acquire the memory information from the linuxboot table in memory.
>   
> @@ -67,20 +142,50 @@ void AddMemoryRange(IN BL_MEM_INFO_CALLBACK MemInfoCallback, IN UINTN start,
>   RETURN_STATUS
>   EFIAPI
>   ParseMemoryInfo(IN BL_MEM_INFO_CALLBACK MemInfoCallback, IN VOID* Params) {
> -  UefiPayloadConfig* config;
> -  int i;
> +  const UefiPayloadConfig* config = GetUefiPayLoadConfig();
> +  if (!config) {
> +    DEBUG(
> +        (DEBUG_ERROR, "ParseMemoryInfo: Could not find UEFI Payload config\n"));
> +    return RETURN_SUCCESS;
> +  }
> +
> +  if (config->Version == UEFI_PAYLOAD_CONFIG_VERSION1) {
> +    const UefiPayloadConfigV1* config1 = &config->config.v1;
> +    DEBUG(
> +        (DEBUG_INFO, "MemoryMap #entries: %d\n", config1->NumMemoryMapEntries));
> +
> +    for (int i = 0; i < config1->NumMemoryMapEntries; i++) {
> +      const MemoryMapEntry* entry = &config1->MemoryMapEntries[i];
> +      DEBUG((DEBUG_INFO, "Start: 0x%lx End: 0x%lx Type:%d\n", entry->Start,
> +             entry->End, entry->Type));
> +      AddMemoryRange(MemInfoCallback, entry->Start, entry->End, entry->Type);
> +    }
> +  } else
>   
> -  config = GetUefiPayLoadConfig();
> +      if (config->Version == UEFI_PAYLOAD_CONFIG_VERSION2) {
> +    const char* cmdline = config->config.v2.cmdline;
> +    const char* option;
> +    uint64_t args[3];
>   
> -  DEBUG((DEBUG_INFO, "MemoryMap #entries: %d\n", config->NumMemoryMapEntries));
> +    // look for the mem=start,end,type
> +    while ((cmdline = cmdline_next(cmdline, &option))) {
> +      if (strncmp(option, "mem=", 4) != 0) continue;
>   
> -  MemoryMapEntry* entry = &config->MemoryMapEntries[0];
> -  for (i = 0; i < config->NumMemoryMapEntries; i++) {
> -    DEBUG((DEBUG_INFO, "Start: 0x%lx End: 0x%lx Type:%d\n", entry->Start,
> -           entry->End, entry->Type));
> -    AddMemoryRange(MemInfoCallback, entry->Start, entry->End, entry->Type);
> -    entry++;
> +      if (cmdline_ints(option, args, 3) != 3) {
> +        DEBUG((DEBUG_ERROR, "Parse error: '%a'\n", option));
> +        continue;
> +      }
> +
> +      const uint64_t start = args[0];
> +      const uint64_t end = args[1];
> +      const uint64_t type = args[2];
> +
> +      DEBUG(
> +          (DEBUG_INFO, "Start: 0x%lx End: 0x%lx Type:%d\n", start, end, type));
> +      AddMemoryRange(MemInfoCallback, start, end, type);
> +    }
>     }
> +
>     return RETURN_SUCCESS;
>   }
>   
> @@ -96,14 +201,52 @@ ParseMemoryInfo(IN BL_MEM_INFO_CALLBACK MemInfoCallback, IN VOID* Params) {
>   RETURN_STATUS
>   EFIAPI
>   ParseSystemTable(OUT SYSTEM_TABLE_INFO* SystemTableInfo) {
> -  UefiPayloadConfig* config;
> +  const UefiPayloadConfig* config = GetUefiPayLoadConfig();
> +  if (!config) {
> +    DEBUG((DEBUG_ERROR,
> +           "ParseSystemTable: Could not find UEFI Payload config\n"));
> +    return RETURN_SUCCESS;
> +  }
>   
> -  config = GetUefiPayLoadConfig();
> -  SystemTableInfo->AcpiTableBase = config->AcpiBase;
> -  SystemTableInfo->AcpiTableSize = config->AcpiSize;
> +  if (config->Version == UEFI_PAYLOAD_CONFIG_VERSION1) {
> +    const UefiPayloadConfigV1* config1 = &config->config.v1;
> +    SystemTableInfo->AcpiTableBase = config1->AcpiBase;
> +    SystemTableInfo->AcpiTableSize = config1->AcpiSize;
>   
> -  SystemTableInfo->SmbiosTableBase = config->SmbiosBase;
> -  SystemTableInfo->SmbiosTableSize = config->SmbiosSize;
> +    SystemTableInfo->SmbiosTableBase = config1->SmbiosBase;
> +    SystemTableInfo->SmbiosTableSize = config1->SmbiosSize;
> +  } else
> +
> +      if (config->Version == UEFI_PAYLOAD_CONFIG_VERSION2) {
> +    const char* cmdline = config->config.v2.cmdline;
> +    const char* option;
> +    uint64_t args[2];
> +
> +    // look for the acpi config
> +    while ((cmdline = cmdline_next(cmdline, &option))) {
> +      if (strncmp(option, "ACPI20=", 7) == 0) {
> +        const int count = cmdline_ints(option, args, 2);
> +        if (count < 0) {
> +          DEBUG((DEBUG_ERROR, "Parse error: '%a'\n", option));
> +          continue;
> +        }
> +
> +        if (count > 0) SystemTableInfo->AcpiTableBase = args[0];
> +        if (count > 1) SystemTableInfo->AcpiTableSize = args[1];
> +      }
> +
> +      if (strncmp(option, "SMBIOS=", 7) == 0) {
> +        const int count = cmdline_ints(option, args, 2);
> +        if (count < 0) {
> +          DEBUG((DEBUG_ERROR, "Parse error: '%a'\n", option));
> +          continue;
> +        }
> +
> +        if (count > 0) SystemTableInfo->SmbiosTableBase = args[0];
> +        if (count > 1) SystemTableInfo->SmbiosTableSize = args[1];
> +      }

Sorry, from only a quick peak, can this not leave {Acpi,Smbios}TableBase
and {Acpi,Smbios}TableSize undefined entirely, while returning
RETURN_SUCCESS?
Even if not, it looks kind of odd a command-line argument can change the
base address without changing the size, is there a documentation of this
behaviour?
What is the structure supposed to carry if no such arguments are given
at all?

Thanks for your time!

Best regards,
Marvin

> +    }
> +  }
>   
>     return RETURN_SUCCESS;
>   }
> @@ -120,15 +263,52 @@ ParseSystemTable(OUT SYSTEM_TABLE_INFO* SystemTableInfo) {
>   RETURN_STATUS
>   EFIAPI
>   ParseSerialInfo(OUT SERIAL_PORT_INFO* SerialPortInfo) {
> -  UefiPayloadConfig* config;
> -  config = GetUefiPayLoadConfig();
> -
> -  SerialPortInfo->BaseAddr = config->SerialConfig.BaseAddr;
> -  SerialPortInfo->RegWidth = config->SerialConfig.RegWidth;
> -  SerialPortInfo->Type = config->SerialConfig.Type;
> -  SerialPortInfo->Baud = config->SerialConfig.Baud;
> -  SerialPortInfo->InputHertz = config->SerialConfig.InputHertz;
> -  SerialPortInfo->UartPciAddr = config->SerialConfig.UartPciAddr;
> +  // fill in some reasonable defaults
> +  SerialPortInfo->BaseAddr = 0x3f8;
> +  SerialPortInfo->RegWidth = 1;
> +  SerialPortInfo->Type = 1;  // uefi.SerialPortTypeIO
> +  SerialPortInfo->Baud = 115200;
> +  SerialPortInfo->InputHertz = 1843200;
> +  SerialPortInfo->UartPciAddr = 0;
> +
> +  const UefiPayloadConfig* config = GetUefiPayLoadConfig();
> +  if (!config) {
> +    DEBUG((DEBUG_ERROR, "ParseSerialInfo: using default config\n"));
> +    return RETURN_SUCCESS;
> +  }
> +
> +  if (config->Version == UEFI_PAYLOAD_CONFIG_VERSION1) {
> +    const UefiPayloadConfigV1* config1 = &config->config.v1;
> +    SerialPortInfo->BaseAddr = config1->SerialConfig.BaseAddr;
> +    SerialPortInfo->RegWidth = config1->SerialConfig.RegWidth;
> +    SerialPortInfo->Type = config1->SerialConfig.Type;
> +    SerialPortInfo->Baud = config1->SerialConfig.Baud;
> +    SerialPortInfo->InputHertz = config1->SerialConfig.InputHertz;
> +    SerialPortInfo->UartPciAddr = config1->SerialConfig.UartPciAddr;
> +  } else
> +
> +      if (config->Version == UEFI_PAYLOAD_CONFIG_VERSION2) {
> +    const char* cmdline = config->config.v2.cmdline;
> +    const char* option;
> +    uint64_t args[6] = {};
> +
> +    while ((cmdline = cmdline_next(cmdline, &option))) {
> +      if (strncmp(option, "serial=", 7) != 0) continue;
> +
> +      const int count = cmdline_ints(option, args, 6);
> +      if (count < 0) {
> +        DEBUG((DEBUG_ERROR, "Parse error: %a\n", option));
> +        continue;
> +      }
> +
> +      if (count > 0) SerialPortInfo->Baud = args[0];
> +      if (count > 1) SerialPortInfo->BaseAddr = args[1];
> +      if (count > 2) SerialPortInfo->RegWidth = args[2];
> +      if (count > 3) SerialPortInfo->Type = args[3];
> +      if (count > 4) SerialPortInfo->InputHertz = args[4];
> +      if (count > 5) SerialPortInfo->UartPciAddr = args[5];
> +    }
> +  }
>   
>     return RETURN_SUCCESS;
>   }


Cancelled Event: TianoCore Design Meeting - APAC/NAMO - Friday, July 23, 2021 #cal-cancelled

devel@edk2.groups.io Calendar <noreply@...>
 

Cancelled: TianoCore Design Meeting - APAC/NAMO

This event has been cancelled.

When:
Friday, July 23, 2021
9:30am to 10:30am
(UTC+08:00) Asia/Shanghai

Where:
Microsoft Teams

Organizer: Ray Ni ray.ni@...

Description:

TOPIC

  1. NA

For more info, see here: https://www.tianocore.org/design-meeting/


Microsoft Teams meeting

Join on your computer or mobile app

Click here to join the meeting

Join with a video conferencing device

teams@...

Video Conference ID: 119 715 416 0

Alternate VTC dialing instructions

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[PATCH 3/3] IntelSiliconPkg: Add IgdOpRegion30.h to support IGD OpRegion v3.0

Digant H Solanki
 

REF:https://bugzilla.tianocore.org/show_bug.cgi?id=3426

- There are many OpRegion fields obsoleted in MBOX1
- MBOX2 is re-purposed for Backlight related fields for dual LFP.
- Backlight related fields moved to MBOX2 from MBOX3
and some fields are obsoleted in MBOX3.

Signed-off-by: Digant H Solanki <digant.h.solanki@...>
Cc: Ray Ni <ray.ni@...>
Cc: Rangasai V Chaganty <rangasai.v.chaganty@...>
Cc: Ashraf Ali S <ashraf.ali.s@...>
---
Silicon/Intel/IntelSiliconPkg/Include/IndustryStandard/IgdOpRegion30.h | 101 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 101 insertions(+)

diff --git a/Silicon/Intel/IntelSiliconPkg/Include/IndustryStandard/IgdOpRegion30.h b/Silicon/Intel/IntelSiliconPkg/Include/IndustryStandard/IgdOpRegion30.h
new file mode 100644
index 0000000000..c9948ab55f
--- /dev/null
+++ b/Silicon/Intel/IntelSiliconPkg/Include/IndustryStandard/IgdOpRegion30.h
@@ -0,0 +1,101 @@
+/** @file
+ IGD OpRegion definition from Intel Integrated Graphics Device OpRegion
+ Specification based on version 3.0.
+
+ Copyright (c) 2021, Intel Corporation. All rights reserved.<BR>
+ SPDX-License-Identifier: BSD-2-Clause-Patent
+
+**/
+#ifndef _IGD_OPREGION_3_0_H_
+#define _IGD_OPREGION_3_0_H_
+
+#include "IgdOpRegion.h"
+
+#define IGD_OPREGION_HEADER_MBOX2_VER_3_0 BIT5
+
+#pragma pack(1)
+///
+/// OpRegion Mailbox 1 - Public ACPI Methods
+/// Offset 0x100, Size 0x100
+///
+typedef struct {
+ UINT32 DRDY; ///< Offset 0x100 Driver Readiness
+ UINT32 CSTS; ///< Offset 0x104 Status
+ UINT32 CEVT; ///< Offset 0x108 Current Event
+ UINT8 RM11[0x14]; ///< Offset 0x10C Reserved Must be Zero
+ UINT32 DIDL[8]; ///< Offset 0x120 Supported Display Devices ID List
+ UINT32 CPDL[8]; ///< Offset 0x140 obsolete
+ UINT32 CADL[8]; ///< Offset 0x160 obsolete
+ UINT32 NADL[8]; ///< Offset 0x180 obsolete
+ UINT32 ASLP; ///< Offset 0x1A0 ASL Sleep Time Out
+ UINT32 TIDX; ///< Offset 0x1A4 obsolete
+ UINT32 CHPD; ///< Offset 0x1A8 obsolete
+ UINT32 CLID; ///< Offset 0x1AC Current Lid State Indicator
+ UINT32 CDCK; ///< Offset 0x1B0 Current Docking State Indicator
+ UINT32 SXSW; ///< Offset 0x1B4 obsolete
+ UINT32 EVTS; ///< Offset 0x1B8 obsolete
+ UINT32 CNOT; ///< Offset 0x1BC obsolete
+ UINT32 NRDY; ///< Offset 0x1C0 Driver Status
+ UINT8 DID2[0x1C]; ///< Offset 0x1C4 Extended Supported Devices ID List (DOD)
+ UINT8 CPD2[0x1C]; ///< Offset 0x1E0 obsolete
+ UINT8 RM12[4]; ///< Offset 0x1FC - 0x1FF Reserved Must be zero
+} IGD_OPREGION_MBOX1_VER_3_0;
+
+///
+/// OpRegion Mailbox 2 - Backlight communication
+/// Offset 0x200, Size 0x100
+///
+typedef struct {
+ UINT32 BCL1; ///< Offset 0x200 Backlight Brightness for LFP1
+ UINT32 BCL2; ///< Offset 0x204 Backlight Brightness for LFP2
+ UINT32 CBL1; ///< Offset 0x208 Current User Brightness Level for LFP1
+ UINT32 CBL2; ///< Offset 0x20C Current User Brightness Level for LFP2
+ UINT32 BCM1[0x1E]; ///< Offset 0x210 Backlight Brightness Levels Duty Cycle Mapping Table for LFP1
+ UINT32 BCM2[0x1E]; ///< Offset 0x288 Backlight Brightness Levels Duty Cycle Mapping Table for LFP2
+} IGD_OPREGION_MBOX2_VER_3_0;
+
+///
+/// OpRegion Mailbox 3 - BIOS/Driver Notification - ASLE Support
+/// Offset 0x300, Size 0x100
+///
+typedef struct {
+ UINT32 ARDY; ///< Offset 0x300 obsolete
+ UINT32 ASLC; ///< Offset 0x304 obsolete
+ UINT32 TCHE; ///< Offset 0x308 obsolete
+ UINT32 ALSI; ///< Offset 0x30C obsolete
+ UINT32 BCLP; ///< Offset 0x310 obsoleted in ver 3.0, moved to Mailbox 2.
+ UINT32 PFIT; ///< Offset 0x314 obsolete
+ UINT32 CBLV; ///< Offset 0x318 obsoleted in ver 3.0, moved to Mailbox 2.
+ UINT16 BCLM[0x14]; ///< Offset 0x31C obsoleted in ver 3.0, moved to Mailbox 2.
+ UINT32 CPFM; ///< Offset 0x344 obsolete
+ UINT32 EPFM; ///< Offset 0x348 obsolete
+ UINT8 PLUT[0x4A]; ///< Offset 0x34C obsolete
+ UINT32 PFMB; ///< Offset 0x396 obsolete
+ UINT32 CCDV; ///< Offset 0x39A obsolete
+ UINT32 PCFT; ///< Offset 0x39E obsolete
+ UINT32 SROT; ///< Offset 0x3A2 obsolete
+ UINT32 IUER; ///< Offset 0x3A6 obsolete
+ UINT64 FDSS; ///< Offset 0x3AA obsolete
+ UINT32 FDSP; ///< Offset 0x3B2 obsolete
+ UINT32 STAT; ///< Offset 0x3B6 obsolete
+ UINT64 RVDA; ///< Offset 0x3BA Physical address of Raw VBT data. Added from Spec Version 0.90 to support VBT greater than 6KB.
+ UINT32 RVDS; ///< Offset 0x3C2 Size of Raw VBT data. Added from Spec Version 0.90 to support VBT greater than 6KB.
+ UINT8 VRSR; ///< Offset 0x3C6 Video RAM Self Refresh
+ UINT64 DLHP; ///< Offset 0x3C7 Dual LFP Hinge Alignment Parameters
+ UINT8 RM32[0x31]; ///< Offset 0x3CF - 0x3FF Reserved Must be zero.
+} IGD_OPREGION_MBOX3_VER_3_0;
+
+///
+/// IGD OpRegion Structure
+///
+typedef struct {
+ IGD_OPREGION_HEADER Header; ///< OpRegion header (Offset 0x0, Size 0x100)
+ IGD_OPREGION_MBOX1_VER_3_0 MBox1; ///< Mailbox 1: Public ACPI Methods (Offset 0x100, Size 0x100)
+ IGD_OPREGION_MBOX2_VER_3_0 MBox2; ///< Mailbox 2: Backlight communication (Offset 0x200, Size 0x100)
+ IGD_OPREGION_MBOX3_VER_3_0 MBox3; ///< Mailbox 3: BIOS to Driver Notification (Offset 0x300, Size 0x100)
+ IGD_OPREGION_MBOX4 MBox4; ///< Mailbox 4: Video BIOS Table (VBT) (Offset 0x400, Size 0x1800)
+ IGD_OPREGION_MBOX5 MBox5; ///< Mailbox 5: BIOS to Driver Notification Extension (Offset 0x1C00, Size 0x400)
+} IGD_OPREGION_STRUCTURE_VER_3_0;
+#pragma pack()
+
+#endif
--
2.30.2.windows.1


Re: [edk2-platform][PATCH v1 1/1] Platform/RaspberryPi/RPi4: Fix non-standard ACPI HIDs

Ard Biesheuvel
 

On Wed, 21 Jul 2021 at 22:39, Andrei Warkentin <awarkentin@...> wrote:

Reviewed-by: Andrei Warkentin <awarkentin@...>
Pushed as d549e39ca1a9..194269223294

Thanks all,

________________________________
From: Ard Biesheuvel <ardb@...>
Sent: Tuesday, July 20, 2021 10:37 AM
To: Samer El-Haj-Mahmoud <Samer.El-Haj-Mahmoud@...>
Cc: edk2-devel-groups-io <devel@edk2.groups.io>; Leif Lindholm <leif@...>; Ard Biesheuvel <ardb+tianocore@...>; Pete Batard <pete@...>; Andrei Warkentin <awarkentin@...>; Mario Bălănică <mariobalanica02@...>
Subject: Re: [edk2-platform][PATCH v1 1/1] Platform/RaspberryPi/RPi4: Fix non-standard ACPI HIDs

On Mon, 19 Jul 2021 at 22:45, Samer El-Haj-Mahmoud
<Samer.El-Haj-Mahmoud@...> wrote:

Remove non-standard RPI ACPI _CIDs that are not needed.
This also fixes the FWTS failure reported in
https://nam04.safelinks.protection.outlook.com/?url=https%3A%2F%2Fgithub.com%2Fpftf%2FRPi4%2Fissues%2F67&;data=04%7C01%7Cawarkentin%40vmware.com%7Cbfd9e47da54c40ef9c5408d94b51486a%7Cb39138ca3cee4b4aa4d6cd83d9dd62f0%7C0%7C0%7C637623634750321947%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C1000&amp;sdata=YO4V6pksRlNqfPlMwO0VPKNVcp4npeP%2BN%2BpigTFfZnM%3D&amp;reserved=0

The windows drivers at https://nam04.safelinks.protection.outlook.com/?url=https%3A%2F%2Fgithub.com%2Fraspberrypi%2Fwindows-drivers&;data=04%7C01%7Cawarkentin%40vmware.com%7Cbfd9e47da54c40ef9c5408d94b51486a%7Cb39138ca3cee4b4aa4d6cd83d9dd62f0%7C0%7C0%7C637623634750321947%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C1000&amp;sdata=PMkBX%2F6vHaAoUC5tkCA7aAldaYEKFgh9w3yFYsgNrPQ%3D&amp;reserved=0
are still able to match the ACPI objects using the HIDs which
are supported in the drivers, with these two recent changes needed:
469702898789e555c6947e50216a3f79e0ddeb9
and
5c5e2742b4c983b3001c473b168b0dae2fcba0c2

Cc: Leif Lindholm <leif@...>
Cc: Ard Biesheuvel <ardb+tianocore@...>
Cc: Pete Batard <pete@...>
Cc: Andrei Warkentin <awarkentin@...>
Cc: Mario Bălănică <mariobalanica02@...>
Signed-off-by: Samer El-Haj-Mahmoud <Samer.El-Haj-Mahmoud@...>
Tested-by: Mario Bălănică <mariobalanica02@...>
Glad to see this getting cleaned up.

Anyone care to ack?


---
Platform/RaspberryPi/AcpiTables/GpuDevs.asl | 26 +++++++++++---------
Platform/RaspberryPi/AcpiTables/Sdhc.asl | 4 +--
Platform/RaspberryPi/AcpiTables/Uart.asl | 2 +-
3 files changed, 18 insertions(+), 14 deletions(-)

diff --git a/Platform/RaspberryPi/AcpiTables/GpuDevs.asl b/Platform/RaspberryPi/AcpiTables/GpuDevs.asl
index 966a94cdb5b5..9750dc25c07c 100644
--- a/Platform/RaspberryPi/AcpiTables/GpuDevs.asl
+++ b/Platform/RaspberryPi/AcpiTables/GpuDevs.asl
@@ -13,7 +13,11 @@
Device (USB0)
{
Name (_HID, "BCM2848")
- Name (_CID, Package() { "DWC_OTG", "DWC2_OTG" })
+#if (RPI_MODEL == 3)
+ Name (_CID, "DWC_OTG")
+#elif (RPI_MODEL == 4)
+ Name (_CID, "BCM2848")
+#endif
Name (_UID, 0x0)
Name (_CCA, 0x0)
Method (_STA)
@@ -36,7 +40,7 @@ Device (USB0)
Device (GPU0)
{
Name (_HID, "BCM2850")
- Name (_CID, "VC4")
+ Name (_CID, "BCM2850")
Name (_UID, 0x0)
Name (_CCA, 0x0)
Method (_STA)
@@ -140,7 +144,7 @@ Device (GPU0)
Device (RPIQ)
{
Name (_HID, "BCM2849")
- Name (_CID, "RPIQ")
+ Name (_CID, "BCM2849")
Name (_UID, 0)
Name (_CCA, 0x0)
Method (_STA)
@@ -164,7 +168,7 @@ Device (RPIQ)
Device (VCIQ)
{
Name (_HID, "BCM2835")
- Name (_CID, "VCIQ")
+ Name (_CID, "BCM2835")
Name (_UID, 0)
Name (_CCA, 0x0)
Name (_DEP, Package() { \_SB.GDV0.RPIQ })
@@ -189,7 +193,7 @@ Device (VCIQ)
Device (VCSM)
{
Name (_HID, "BCM2856")
- Name (_CID, "VCSM")
+ Name (_CID, "BCM2856")
Name (_UID, 0)
Name (_CCA, 0x0)
Name (_DEP, Package() { \_SB.GDV0.VCIQ })
@@ -203,7 +207,7 @@ Device (VCSM)
Device (GPI0)
{
Name (_HID, "BCM2845")
- Name (_CID, "BCMGPIO")
+ Name (_CID, "BCM2845")
Name (_UID, 0x0)
Name (_CCA, 0x0)
Method (_STA)
@@ -230,7 +234,7 @@ Device (GPI0)
Device (I2C1)
{
Name (_HID, "BCM2841")
- Name (_CID, "BCMI2C")
+ Name (_CID, "BCM2841")
Name (_UID, 0x1)
Name (_CCA, 0x0)
Method (_STA)
@@ -254,7 +258,7 @@ Device (I2C1)
Device (I2C2)
{
Name (_HID, "BCM2841")
- Name (_CID, "BCMI2C")
+ Name (_CID, "BCM2841")
Name (_UID, 0x2)
Name (_CCA, 0x0)
Method (_STA)
@@ -278,7 +282,7 @@ Device (I2C2)
Device (SPI0)
{
Name (_HID, "BCM2838")
- Name (_CID, "BCMSPI0")
+ Name (_CID, "BCM2838")
Name (_UID, 0x0)
Name (_CCA, 0x0)
Method (_STA)
@@ -304,7 +308,7 @@ Device (SPI0)
Device (SPI1)
{
Name (_HID, "BCM2839")
- Name (_CID, "BCMAUXSPI")
+ Name (_CID, "BCM2839")
Name (_UID, 0x1)
Name (_CCA, 0x0)
Name (_DEP, Package() { \_SB.GDV0.RPIQ })
@@ -331,7 +335,7 @@ Device (SPI1)
// Device (SPI2)
// {
// Name (_HID, "BCM2839")
-// Name (_CID, "BCMAUXSPI")
+// Name (_CID, "BCM2839")
// Name (_UID, 0x2)
// Name (_CCA, 0x0)
// Name (_DEP, Package() { \_SB.GDV0.RPIQ })
diff --git a/Platform/RaspberryPi/AcpiTables/Sdhc.asl b/Platform/RaspberryPi/AcpiTables/Sdhc.asl
index 42776e33bbc6..85d5053a338c 100644
--- a/Platform/RaspberryPi/AcpiTables/Sdhc.asl
+++ b/Platform/RaspberryPi/AcpiTables/Sdhc.asl
@@ -23,7 +23,7 @@
Device (SDC1)
{
Name (_HID, "BCM2847")
- Name (_CID, "ARASAN")
+ Name (_CID, "BCM2847")
Name (_UID, 0x0)
Name (_CCA, 0x0)
Name (_S1D, 0x1)
@@ -78,7 +78,7 @@ Device (SDC1)
Device (SDC2)
{
Name (_HID, "BCM2855")
- Name (_CID, "SDHST")
+ Name (_CID, "BCM2855")
Name (_UID, 0x0)
Name (_CCA, 0x0)
Name (_S1D, 0x1)
diff --git a/Platform/RaspberryPi/AcpiTables/Uart.asl b/Platform/RaspberryPi/AcpiTables/Uart.asl
index 167f94e8892b..974f06d3bc3f 100644
--- a/Platform/RaspberryPi/AcpiTables/Uart.asl
+++ b/Platform/RaspberryPi/AcpiTables/Uart.asl
@@ -59,7 +59,7 @@ Device (URT0)
Device (URTM)
{
Name (_HID, "BCM2836")
- Name (_CID, "MINIUART")
+ Name (_CID, "BCM2836")
Name (_UID, 0x0)
Name (_CCA, 0x0)
Method (_STA)
--
2.25.1


Re: RFC: EXT4 filesystem driver

Marvin Häuser <mhaeuser@...>
 

On 22.07.21 01:12, Pedro Falcato wrote:
EXT4 (fourth extended filesystem) is a filesystem developed for Linux
that has been in wide use (desktops, servers, smartphones) since 2008.

The Ext4Pkg implements the Simple File System Protocol for a partition
that is formatted with the EXT4 file system. This allows UEFI Drivers,
UEFI Applications, UEFI OS Loaders, and the UEFI Shell to access files
on an EXT4 partition and supports booting a UEFI OS Loader from an
EXT4 partition.
This project is one of the TianoCore Google Summer of Code projects.

Right now, Ext4Pkg only contains a single member, Ext4Dxe, which is a
UEFI driver that consumes Block I/O, Disk I/O and (optionally) Disk
I/O 2 Protocols, and produces the Simple File System protocol. It
allows mounting ext4 filesystems exclusively.

Brief overhead of EXT4:
Layout of an EXT2/3/4 filesystem:
(note: this driver has been developed using
https://www.kernel.org/doc/html/latest/filesystems/ext4/index.html as
documentation).

An ext2/3/4 filesystem (here on out referred to as simply an ext4 filesystem,
due to the similarities) is composed of various concepts:

1) Superblock
The superblock is the structure near (1024 bytes offset from the start)
the start of the partition, and describes the filesystem in general.
Here, we get to know the size of the filesystem's blocks, which features
it supports or not, whether it's been cleanly unmounted, how many blocks
we have, etc.

2) Block groups
EXT4 filesystems are divided into block groups, and each block group covers
s_blocks_per_group(8 * Block Size) blocks. Each block group has an
associated block group descriptor; these are present directly after the
superblock. Each block group descriptor contains the location of the
inode table, and the inode and block bitmaps (note these bitmaps are only
a block long, which gets us the 8 * Block Size formula covered previously).

3) Blocks
The ext4 filesystem is divided into blocks, of size s_log_block_size ^ 1024.
Blocks can be allocated using individual block groups's bitmaps. Note
that block 0 is invalid and its presence on extents/block tables means
it's part of a file hole, and that particular location must be read as
a block full of zeros.

4) Inodes
The ext4 filesystem divides files/directories into inodes (originally
index nodes). Each file/socket/symlink/directory/etc (here on out referred
to as a file, since there is no distinction under the ext4 filesystem) is
stored as a /nameless/ inode, that is stored in some block group's inode
table. Each inode has s_inode_size size (or GOOD_OLD_INODE_SIZE if it's
an old filesystem), and holds various metadata about the file. Since the
largest inode structure right now is ~160 bytes, the rest of the inode
contains inline extended attributes. Inodes' data is stored using either
data blocks (under ext2/3) or extents (under ext4).

5) Extents
Ext4 inodes store data in extents. These let N contiguous logical blocks
that are represented by N contiguous physical blocks be represented by a
single extent structure, which minimizes filesystem metadata bloat and
speeds up block mapping (particularly due to the fact that high-quality
ext4 implementations like linux's try /really/ hard to make the file
contiguous, so it's common to have files with almost 0 fragmentation).
Inodes that use extents store them in a tree, and the top of the tree
is stored on i_data. The tree's leaves always start with an
EXT4_EXTENT_HEADER and contain EXT4_EXTENT_INDEX on eh_depth != 0 and
EXT4_EXTENT on eh_depth = 0; these entries are always sorted by logical
block.

6) Directories
Ext4 directories are files that store name -> inode mappings for the
logical directory; this is where files get their names, which means ext4
inodes do not themselves have names, since they can be linked (present)
multiple times with different names. Directories can store entries in two
different ways:
1) Classical linear directories: They store entries as a mostly-linked
mostly-list of EXT4_DIR_ENTRY.
2) Hash tree directories: These are used for larger directories, with
hundreds of entries, and are designed in a backwards-compatible way.
These are not yet implemented in the Ext4Dxe driver.

7) Journal
Ext3/4 filesystems have a journal to help protect the filesystem against
system crashes. This is not yet implemented in Ext4Dxe but is described
in detail in the Linux kernel's documentation.

The EDK2 implementation of ext4 is based only on the public documentation
available at https://www.kernel.org/doc/html/latest/filesystems/ext4/index.html
and
the FreeBSD ext2fs driver (available at
https://github.com/freebsd/freebsd-src/tree/main/sys/fs/ext2fs,
BSD-2-Clause-FreeBSD licensed). It is licensed as
SPDX-License-Identifier: BSD-2-Clause-Patent.

After a brief discussion with the community, the proposed package
location is edk2-platform/Features/Ext4Pkg
(relevant discussion: https://edk2.groups.io/g/devel/topic/83060185).

I was the main contributor and I would like to maintain the package in
the future, if possible.
While I personally don't like it's outside of the EDK II core, I kind of get it. However I would strongly suggest to choose a more general package name, like "LinuxFsPkg", or "NixFsPkg", or maybe even just "FileSystemPkg" (and move FAT over some day?). Imagine someone wants to import BTRFS next year, should it really be "BtrfsPkg"? I understand it follows the "FatPkg" convention, but I feel like people forget FatPkg was special as to its awkward license before Microsoft allowed a change a few years ago. Maintainers.txt already has the concept of different Reviewers per subfolder, maybe it could be extended a little to have a common EDK II contributor to officially maintain the package, but have you be a Maintainer or something like a Reviewer+ to your driver? Or you could maintain the entire package of course.

Current limitations:
1) The Ext4Dxe driver is, at the moment, read-only.
2) The Ext4Dxe driver at the moment cannot mount older (ext2/3)
filesystems. Ensuring compatibility with
those may not be a bad idea.

I intend to test the package using the UEFI SCTs present in edk2-test,
and implement any other needed unit tests myself using the already
available unit test framework. I also intend to (privately) fuzz the
UEFI driver with bad/unusual disk images, to improve the security and
reliability of the driver.

In the future, ext4 write support should be added so edk2 has a
fully-featured RW ext4 driver. There could also be a focus on
supporting the older ext4-like filesystems, as I mentioned in the
limitations, but that is open for discussion.
I may be alone, but I strongly object. One of our projects (OpenCore) has a disgusting way of writing files because the FAT32 driver in Aptio IV firmwares may corrupt the filesystem when resizing files. To be honest, it may corrupt with other usages too and we never noticed, because basically we wrote the code to require the least amount of (complex) FS operations.

The issue with EDK II is, there is a lot of own code and a lot of users, but little testing. By that I do not mean that developers do not test their code, but that nobody sits down and performs all sorts of FS manipulations in all sorts of orders and closely observes the result for regression-testing. Users will not really test it either, as UEFI to them should just somehow boot to Windows. If at least the code was shared with a codebase that is known-trusted (e.g. the Linux kernel itself), that'd be much easier to trust, but realistically this is not going to happen.
My point is, if a company like AMI cannot guarantee writing does not damage the FS for a very simple FS, how do you plan to guarantee yours doesn't for a much more complex FS? I'd rather have only one simple FS type that supports writing for most use-cases (e.g. logging).

At the very least I would beg you to have a PCD to turn write support off - if it will be off by default, that'd be great of course. :)
Was there any discussion yet as to why write support is needed in the first place you could point me to?

Thanks for your work!

Best regards,
Marvin

The driver's handling of unclean unmounting through forced shutdown is unclear.
Is there a position in edk2 on how to handle such cases? I don't think
FAT32 has a "this filesystem is/was dirty" and even though it seems to
me that stopping a system from booting/opening the partition because
"we may find some tiny irregularities" is not the best course of
action, I can't find a clear answer.

The driver also had to add implementations of CRC32C and CRC16, and
after talking with my mentor we quickly reached the conclusion that
these may be good candidates for inclusion in MdePkg. We also
discussed moving the Ucs2 <-> Utf8 conversion library in RedfishPkg
(BaseUcs2Utf8Lib) into MdePkg as well. Any comments?

Feel free to ask any questions you may find relevant.

Best Regards,

Pedro Falcato



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