> Git commit 54753b60 (SVN r16870), "MdeModulePkg: Update SMBIOS revision to
> 3.0." changed PcdSmbiosVersion from 0x0208 to 0x0300. This controls the
> version number of the SMBIOS entry point table (and other things) that
> "MdeModulePkg/Universal/SmbiosDxe" installs.
>
> Alas, this change breaks older Linux guests, like RHEL-6 (up to RHEL-6.7);
> those are limited to 2.x (both in the guest kernel firmware driver, and in
> the dmidecode utility).
>
> The v2.1.0+ machine types of QEMU generate SMBIOS payload for the firmware
> to install. The payload includes the entry point table ("anchor" table).
> OvmfPkg/SmbiosPlatformDxe cannot install the anchor table (because that is
> the jurisdiction of the generic "MdeModulePkg/Universal/SmbiosDxe"
> driver); however, we can parse the entry point version from QEMU's anchor
> table, and instruct "MdeModulePkg/Universal/SmbiosDxe" to adhere to that
> version.
>
> On machine types older than v2.1.0, the feature is not available, but
> then, should anything in OVMF install SMBIOS tables, version 2.8 is simply
> safer / more widely supported than 3.0 -- hence the default 2.8 value for
> the dynamic PCD.
>
> We set the PCD in PlatformPei (when not on the S3 resume path), because
> that's an easy and certain way to set the PCD before a DXE driver reads
> it. This follows the example of PcdEmuVariableNvStoreReserved (which is
> read by EmuVariableFvbRuntimeDxe).
>
> RHBZ: https://bugzilla.redhat.com/show_bug.cgi?id=1232876
> Cc: Gabriel Somlo <so...@cmu.edu>
Acked-by: Gabriel Somlo <so...@cmu.edu>
Thanks much,
--Gabriel
> Cc: Jordan Justen <jordan.l.jus...@intel.com>
> Contributed-under: TianoCore Contribution Agreement 1.0
> Signed-off-by: Laszlo Ersek <ler...@redhat.com>
> ---
>
> Notes:
> This simple patch is somewhat urgent for RHEL-7.2, please help me by
> reviewing it quickly. Thanks!
>
> OvmfPkg/PlatformPei/PlatformPei.inf | 2 ++
> OvmfPkg/PlatformPei/Platform.c | 39
> +++++++++++++++++++++++++++++++++++++
> OvmfPkg/OvmfPkgIa32.dsc | 2 ++
> OvmfPkg/OvmfPkgIa32X64.dsc | 2 ++
> OvmfPkg/OvmfPkgX64.dsc | 2 ++
> 5 files changed, 47 insertions(+)
>
> diff --git a/OvmfPkg/PlatformPei/PlatformPei.inf
> b/OvmfPkg/PlatformPei/PlatformPei.inf
> index 0307bca..721495b 100644
> --- a/OvmfPkg/PlatformPei/PlatformPei.inf
> +++ b/OvmfPkg/PlatformPei/PlatformPei.inf
> @@ -58,6 +58,7 @@ [LibraryClasses]
> QemuFwCfgLib
> MtrrLib
> PcdLib
> + BaseMemoryLib
>
> [Pcd]
> gUefiOvmfPkgTokenSpaceGuid.PcdOvmfPeiMemFvBase
> @@ -81,6 +82,7 @@ [Pcd]
> gEfiMdeModulePkgTokenSpaceGuid.PcdFlashNvStorageVariableSize
> gEfiMdeModulePkgTokenSpaceGuid.PcdEmuVariableNvStoreReserved
> gEfiMdeModulePkgTokenSpaceGuid.PcdPciDisableBusEnumeration
> + gEfiMdeModulePkgTokenSpaceGuid.PcdSmbiosVersion
> gUefiCpuPkgTokenSpaceGuid.PcdCpuLocalApicBaseAddress
>
> [Ppis]
> diff --git a/OvmfPkg/PlatformPei/Platform.c b/OvmfPkg/PlatformPei/Platform.c
> index 2a1b577..fc98fc3 100644
> --- a/OvmfPkg/PlatformPei/Platform.c
> +++ b/OvmfPkg/PlatformPei/Platform.c
> @@ -32,9 +32,11 @@
> #include <Library/PeiServicesLib.h>
> #include <Library/QemuFwCfgLib.h>
> #include <Library/ResourcePublicationLib.h>
> +#include <Library/BaseMemoryLib.h>
> #include <Guid/MemoryTypeInformation.h>
> #include <Ppi/MasterBootMode.h>
> #include <IndustryStandard/Pci22.h>
> +#include <IndustryStandard/SmBios.h>
> #include <OvmfPlatforms.h>
>
> #include "Platform.h"
> @@ -380,6 +382,41 @@ DebugDumpCmos (
>
>
> /**
> + Set the SMBIOS entry point version for the generic SmbiosDxe driver.
> +**/
> +STATIC
> +VOID
> +SmbiosVersionInitialization (
> + VOID
> + )
> +{
> + FIRMWARE_CONFIG_ITEM Anchor;
> + UINTN AnchorSize;
> + SMBIOS_TABLE_ENTRY_POINT QemuAnchor;
> + UINT16 SmbiosVersion;
> +
> + if (RETURN_ERROR (QemuFwCfgFindFile ("etc/smbios/smbios-anchor", &Anchor,
> + &AnchorSize)) ||
> + AnchorSize != sizeof QemuAnchor) {
> + return;
> + }
> +
> + QemuFwCfgSelectItem (Anchor);
> + QemuFwCfgReadBytes (AnchorSize, &QemuAnchor);
> + if (CompareMem (QemuAnchor.AnchorString, "_SM_", 4) != 0 ||
> + CompareMem (QemuAnchor.IntermediateAnchorString, "_DMI_", 5) != 0) {
> + return;
> + }
> +
> + SmbiosVersion = (UINT16)(QemuAnchor.MajorVersion << 8 |
> + QemuAnchor.MinorVersion);
> + DEBUG ((EFI_D_INFO, "%a: SMBIOS version from QEMU: 0x%04x\n", __FUNCTION__,
> + SmbiosVersion));
> + PcdSet16 (PcdSmbiosVersion, SmbiosVersion);
> +}
> +
> +
> +/**
> Perform Platform PEI initialization.
>
> @param FileHandle Handle of the file being invoked.
> @@ -429,6 +466,8 @@ InitializePlatform (
> PeiFvInitialization ();
>
> MemMapInitialization ();
> +
> + SmbiosVersionInitialization ();
> }
>
> MiscInitialization ();
> diff --git a/OvmfPkg/OvmfPkgIa32.dsc b/OvmfPkg/OvmfPkgIa32.dsc
> index ad476da..b71f751 100644
> --- a/OvmfPkg/OvmfPkgIa32.dsc
> +++ b/OvmfPkg/OvmfPkgIa32.dsc
> @@ -380,6 +380,8 @@ [PcdsDynamicDefault]
> gEfiMdeModulePkgTokenSpaceGuid.PcdSetupVideoHorizontalResolution|640
> gEfiMdeModulePkgTokenSpaceGuid.PcdSetupVideoVerticalResolution|480
>
> + gEfiMdeModulePkgTokenSpaceGuid.PcdSmbiosVersion|0x0208
> +
>
> ################################################################################
> #
> # Components Section - list of all EDK II Modules needed by this Platform.
> diff --git a/OvmfPkg/OvmfPkgIa32X64.dsc b/OvmfPkg/OvmfPkgIa32X64.dsc
> index 6b65ee8..12818e5 100644
> --- a/OvmfPkg/OvmfPkgIa32X64.dsc
> +++ b/OvmfPkg/OvmfPkgIa32X64.dsc
> @@ -386,6 +386,8 @@ [PcdsDynamicDefault]
> gEfiMdeModulePkgTokenSpaceGuid.PcdSetupVideoHorizontalResolution|640
> gEfiMdeModulePkgTokenSpaceGuid.PcdSetupVideoVerticalResolution|480
>
> + gEfiMdeModulePkgTokenSpaceGuid.PcdSmbiosVersion|0x0208
> +
>
> ################################################################################
> #
> # Components Section - list of all EDK II Modules needed by this Platform.
> diff --git a/OvmfPkg/OvmfPkgX64.dsc b/OvmfPkg/OvmfPkgX64.dsc
> index a40d7cb..623033d 100644
> --- a/OvmfPkg/OvmfPkgX64.dsc
> +++ b/OvmfPkg/OvmfPkgX64.dsc
> @@ -385,6 +385,8 @@ [PcdsDynamicDefault]
> gEfiMdeModulePkgTokenSpaceGuid.PcdSetupVideoHorizontalResolution|640
> gEfiMdeModulePkgTokenSpaceGuid.PcdSetupVideoVerticalResolution|480
>
> + gEfiMdeModulePkgTokenSpaceGuid.PcdSmbiosVersion|0x0208
> +
>
> ################################################################################
> #
> # Components Section - list of all EDK II Modules needed by this Platform.
> --
> 1.8.3.1
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