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MdePkg: Add the COHERENCY_SFW_NO CPUID bit field

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Update the CPUID 0x8000001F EBX definition to add the COHERENCY_SFW_NO
bit field. The COHERENCY_SFW_NO bit is used to indicate that the SEV-SNP
cache coherency mitigation is not needed.

Signed-off-by: Tom Lendacky <thomas.lendacky@amd.com>
This commit is contained in:
Tom Lendacky 2025-07-22 16:59:44 -05:00 • committed by mergify[bot]
parent 3b0d834db2
commit 07ba06fdf7
1 changed files with 7 additions and 2 deletions
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9
MdePkg/Include/Register/Amd/Cpuid.h
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@ -701,9 +701,14 @@ typedef union {
UINT32 ReducedPhysBits : 5;
///
/// [Bit 31:12] Reserved
/// [Bit 30:12] Reserved
///
UINT32 ReservedBits : 21;
UINT32 ReservedBits : 20;
///
/// [Bit 31] SEV-SNP Cache Coherency Mitigation is not needed
///
UINT32 CoherencySfwNo : 1;
} Bits;
///
/// All bit fields as a 32-bit value