Re: [PATCH V5 08/10] OvmfPkg/IncompatiblePciDeviceSupportDxe: Ignore OptionRom in Td guest


Gerd Hoffmann
 

On Sun, Mar 13, 2022 at 08:41:09AM +0800, Min Xu wrote:
RFC: https://bugzilla.tianocore.org/show_bug.cgi?id=3429

Host VMM may inject OptionRom which is untrusted in Td guest. So PCI
OptionRom needs to be ignored if it is Td guest. According to
"Table 20. ACPI 2.0 & 3.0 QWORD Address Space Descriptor Usage"
PI spec 1.7, type-specific flags can be set to 0 when Address
Translation Offset == 6 to skip device option ROM.

Cc: Michael D Kinney <michael.d.kinney@...>
Cc: Brijesh Singh <brijesh.singh@...>
Cc: Erdem Aktas <erdemaktas@...>
Cc: James Bottomley <jejb@...>
Cc: Jiewen Yao <jiewen.yao@...>
Cc: Tom Lendacky <thomas.lendacky@...>
Cc: Gerd Hoffmann <kraxel@...>
Signed-off-by: Min Xu <min.m.xu@...>
Acked-by: Gerd Hoffmann <kraxel@...>

Join devel@edk2.groups.io to automatically receive all group messages.