OvmfPkg/ResetVector: update SEV support to use new work area format
BZ: https://bugzilla.tianocore.org/show_bug.cgi?id=3429 Update the SEV support to switch to using the newer work area format. Cc: James Bottomley <jejb@linux.ibm.com> Cc: Min Xu <min.m.xu@intel.com> Cc: Jiewen Yao <jiewen.yao@intel.com> Cc: Tom Lendacky <thomas.lendacky@amd.com> Cc: Jordan Justen <jordan.l.justen@intel.com> Cc: Ard Biesheuvel <ardb+tianocore@kernel.org> Cc: Erdem Aktas <erdemaktas@google.com> Signed-off-by: Brijesh Singh <brijesh.singh@amd.com> Reviewed-by: Min Xu <min.m.xu@intel.com> Reviewed-by: Jiewen Yao <Jiewen.yao@intel.com>
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@@ -171,6 +171,9 @@ CheckSevFeatures:
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bt eax, 0
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jnc NoSev
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; Set the work area header to indicate that the SEV is enabled
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mov byte[WORK_AREA_GUEST_TYPE], 1
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; Check for SEV-ES memory encryption feature:
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; CPUID Fn8000_001F[EAX] - Bit 3
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; CPUID raises a #VC exception if running as an SEV-ES guest
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@@ -257,6 +260,11 @@ SevExit:
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IsSevEsEnabled:
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xor eax, eax
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; During CheckSevFeatures, the WORK_AREA_GUEST_TYPE is set
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; to 1 if SEV is enabled.
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cmp byte[WORK_AREA_GUEST_TYPE], 1
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jne SevEsDisabled
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; During CheckSevFeatures, the SEV_ES_WORK_AREA was set to 1 if
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; SEV-ES is enabled.
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cmp byte[SEV_ES_WORK_AREA], 1
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