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OvmfPkg: Use TdHob instead of e820tables to get memory info in TDVF

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Currently, TDVF gets LowMemory and FistNonAddress from the e820tables
via fw_cfg, while TD-Hob can also provide the memory info of LowMemory
and FistNonAddress.

In current stage e820tables are not measured but TD-Hob is measured in
early phase by TDVF.

So, from the security perspective we'd better use the information from
TD-Hob instead of e820tables.

Cc: Erdem Aktas <erdemaktas@google.com>
Cc: Jiewen Yao <jiewen.yao@intel.com>
Cc: Min Xu <min.m.xu@intel.com>
Cc: Gerd Hoffmann <kraxel@redhat.com>
Cc: Elena Reshetova <elena.reshetova@intel.com>
Signed-off-by: Ceping Sun <cepingx.sun@intel.com>
This commit is contained in:
Ceping Sun 2024-08-28 01:16:34 -04:00 committed by mergify[bot]
parent e48acc0fa9
commit d997d3c62f
1 changed files with 34 additions and 0 deletions
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34
OvmfPkg/Library/PlatformInitLib/MemDetect.c
View File

@ -107,6 +107,36 @@ typedef VOID (*E820_SCAN_CALLBACK) (
EFI_HOB_PLATFORM_INFO *PlatformInfoHob
);
STATIC
EFI_STATUS
PlatformScanE820Tdx (
IN E820_SCAN_CALLBACK Callback,
IN OUT EFI_HOB_PLATFORM_INFO *PlatformInfoHob
)
{
EFI_E820_ENTRY64 E820Entry;
EFI_PEI_HOB_POINTERS Hob;
Hob.Raw = (UINT8 *)(UINTN)FixedPcdGet32 (PcdOvmfSecGhcbBase);
while (!END_OF_HOB_LIST (Hob)) {
if (Hob.Header->HobType == EFI_HOB_TYPE_RESOURCE_DESCRIPTOR) {
if ((Hob.ResourceDescriptor->ResourceType == EFI_RESOURCE_MEMORY_UNACCEPTED) ||
(Hob.ResourceDescriptor->ResourceType == EFI_RESOURCE_SYSTEM_MEMORY))
{
E820Entry.BaseAddr = Hob.ResourceDescriptor->PhysicalStart;
E820Entry.Length = Hob.ResourceDescriptor->ResourceLength;
E820Entry.Type = EfiAcpiAddressRangeMemory;
Callback (&E820Entry, PlatformInfoHob);
}
}
Hob.Raw = (UINT8 *)(Hob.Raw + Hob.Header->HobLength);
}
return EFI_SUCCESS;
}
/**
Store first address not used by e820 RAM entries in
PlatformInfoHob->FirstNonAddress
@ -347,6 +377,10 @@ PlatformScanE820 (
return PlatformScanE820Pvh (Callback, PlatformInfoHob);
}
if (TdIsEnabled ()) {
return PlatformScanE820Tdx (Callback, PlatformInfoHob);
}
Status = QemuFwCfgFindFile ("etc/e820", &FwCfgItem, &FwCfgSize);
if (EFI_ERROR (Status)) {
return Status;