[PATCH 3/5] OvmfPkg: Retrieve SMBIOS from Cloud Hypervisor


Boeuf, Sebastien
 

From: Sebastien Boeuf <sebastien.boeuf@intel.com>

Add a fallback on the SMBIOS code to find the SMBIOS table for Cloud
Hypervisor if it couldn't be found for Qemu through fw_cfg.

Signed-off-by: Rob Bradford <robert.bradford@intel.com>
Signed-off-by: Sebastien Boeuf <sebastien.boeuf@intel.com>
---
OvmfPkg/Include/IndustryStandard/CloudHv.h | 5 +++
OvmfPkg/SmbiosPlatformDxe/CloudHv.c | 32 +++++++++++++++++++
OvmfPkg/SmbiosPlatformDxe/EntryPoint.c | 23 +++++++++++--
.../SmbiosPlatformDxe/SmbiosPlatformDxe.inf | 1 +
4 files changed, 59 insertions(+), 2 deletions(-)
create mode 100644 OvmfPkg/SmbiosPlatformDxe/CloudHv.c

diff --git a/OvmfPkg/Include/IndustryStandard/CloudHv.h b/OvmfPkg/Include/IndustryStandard/CloudHv.h
index 6ab18ad50d..ad0e170795 100644
--- a/OvmfPkg/Include/IndustryStandard/CloudHv.h
+++ b/OvmfPkg/Include/IndustryStandard/CloudHv.h
@@ -32,4 +32,9 @@
//
#define CLOUDHV_MMIO_HOLE_SIZE 0x38000000

+//
+// SMBIOS address
+//
+#define CLOUDHV_SMBIOS_ADDRESS 0xf0000
+
#endif // __CLOUDHV_H__
diff --git a/OvmfPkg/SmbiosPlatformDxe/CloudHv.c b/OvmfPkg/SmbiosPlatformDxe/CloudHv.c
new file mode 100644
index 0000000000..f56a810684
--- /dev/null
+++ b/OvmfPkg/SmbiosPlatformDxe/CloudHv.c
@@ -0,0 +1,32 @@
+/** @file
+ Find Cloud Hypervisor SMBIOS data.
+
+ SPDX-License-Identifier: BSD-2-Clause-Patent
+**/
+
+#include <IndustryStandard/CloudHv.h> // CLOUDHV_SMBIOS_ADDRESS
+#include <IndustryStandard/SmBios.h> // SMBIOS_TABLE_3_0_ENTRY_POINT
+
+/**
+ Locates and extracts the QEMU SMBIOS data if present in fw_cfg
+
+ @return Address of extracted QEMU SMBIOS data
+
+**/
+UINT8 *
+GetCloudHvSmbiosTables (
+ VOID
+ )
+{
+ SMBIOS_TABLE_3_0_ENTRY_POINT *CloudHvTables = (VOID *)CLOUDHV_SMBIOS_ADDRESS;
+
+ if (CloudHvTables->AnchorString[0] == '_' &&
+ CloudHvTables->AnchorString[1] == 'S' &&
+ CloudHvTables->AnchorString[2] == 'M' &&
+ CloudHvTables->AnchorString[3] == '3' &&
+ CloudHvTables->AnchorString[4] == '_') {
+ return (UINT8*)(UINTN)CloudHvTables->TableAddress;
+ }
+
+ return NULL;
+}
diff --git a/OvmfPkg/SmbiosPlatformDxe/EntryPoint.c b/OvmfPkg/SmbiosPlatformDxe/EntryPoint.c
index d3b1836a04..28faabb46a 100644
--- a/OvmfPkg/SmbiosPlatformDxe/EntryPoint.c
+++ b/OvmfPkg/SmbiosPlatformDxe/EntryPoint.c
@@ -8,6 +8,11 @@

#include "SmbiosPlatformDxe.h"

+UINT8 *
+GetCloudHvSmbiosTables (
+ VOID
+ );
+
UINT8 *
GetQemuSmbiosTables (
VOID
@@ -32,14 +37,28 @@ SmbiosTablePublishEntry (
{
EFI_STATUS Status;
UINT8 *SmbiosTables;
+ BOOLEAN FreeTables = FALSE;

Status = EFI_NOT_FOUND;
//
// Add QEMU SMBIOS data if found
//
SmbiosTables = GetQemuSmbiosTables ();
- if (SmbiosTables != NULL) {
- Status = InstallAllStructures (SmbiosTables);
+ if (SmbiosTables == NULL) {
+ SmbiosTables = GetCloudHvSmbiosTables ();
+ if (SmbiosTables == NULL) {
+ return EFI_NOT_FOUND;
+ }
+ } else {
+ FreeTables = TRUE;
+ }
+
+ Status = InstallAllStructures (SmbiosTables);
+
+ //
+ // Free SmbiosTables if allocated by Qemu.
+ //
+ if (FreeTables) {
FreePool (SmbiosTables);
}

diff --git a/OvmfPkg/SmbiosPlatformDxe/SmbiosPlatformDxe.inf b/OvmfPkg/SmbiosPlatformDxe/SmbiosPlatformDxe.inf
index e239a631f2..365d96241e 100644
--- a/OvmfPkg/SmbiosPlatformDxe/SmbiosPlatformDxe.inf
+++ b/OvmfPkg/SmbiosPlatformDxe/SmbiosPlatformDxe.inf
@@ -24,6 +24,7 @@
#

[Sources]
+ CloudHv.c
EntryPoint.c
Qemu.c
SmbiosPlatformDxe.c
--
2.30.2

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