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UefiCpuPkg/MpInitLib: For SEV-ES guest, set stack based on processor number

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BZ: https://bugzilla.tianocore.org/show_bug.cgi?id=3008

Set the SEV-ES reset stack address for an AP based on the processor number
instead of the APIC ID in case the APIC IDs are not zero-based and densely
packed/enumerated. This will ensure an AP reset stack address does not get
set outside of the AP reset stack memory allocation.

Cc: Eric Dong <eric.dong@intel.com>
Cc: Ray Ni <ray.ni@intel.com>
Cc: Laszlo Ersek <lersek@redhat.com>
Cc: Rahul Kumar <rahul1.kumar@intel.com>
Acked-by: Ray Ni <ray.ni@intel.com>
Signed-off-by: Tom Lendacky <thomas.lendacky@amd.com>
Message-Id: <24866de07d2a954dec71df70972f1851273020d8.1604685192.git.thomas.lendacky@amd.com>
This commit is contained in:
Tom Lendacky 2020-11-06 11:53:13 -06:00 committed by mergify[bot]
parent 1b0db1ec87
commit d150439b72
1 changed files with 6 additions and 1 deletions
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7
UefiCpuPkg/Library/MpInitLib/MpLib.c
View File

@ -680,11 +680,16 @@ MpInitLibSevEsAPReset (
IN CPU_MP_DATA *CpuMpData IN CPU_MP_DATA *CpuMpData
) )
{ {
EFI_STATUS Status;
UINTN ProcessorNumber;
UINT16 Code16, Code32; UINT16 Code16, Code32;
AP_RESET *APResetFn; AP_RESET *APResetFn;
UINTN BufferStart; UINTN BufferStart;
UINTN StackStart; UINTN StackStart;
Status = GetProcessorNumber (CpuMpData, &ProcessorNumber);
ASSERT_EFI_ERROR (Status);
Code16 = GetProtectedMode16CS (); Code16 = GetProtectedMode16CS ();
Code32 = GetProtectedMode32CS (); Code32 = GetProtectedMode32CS ();
@ -696,7 +701,7 @@ MpInitLibSevEsAPReset (
BufferStart = CpuMpData->MpCpuExchangeInfo->BufferStart; BufferStart = CpuMpData->MpCpuExchangeInfo->BufferStart;
StackStart = CpuMpData->SevEsAPResetStackStart - StackStart = CpuMpData->SevEsAPResetStackStart -
(AP_RESET_STACK_SIZE * GetApicId ()); (AP_RESET_STACK_SIZE * ProcessorNumber);
// //
// This call never returns. // This call never returns.