This patch series provides fixes around AP startup and sorting:
- The CPUID_EXTENDED_TOPOLOGY CPUID leaf takes a sub-leaf as input. The
current SEV-SNP support is attempting to retrieve the this leaf with
sub-leaf 0, but is calling AsmCpuid(), which does not clear ECX before
invoking the CPUID instruction. Therefore, because of the calling
convention, the leaf value becomes the sub-leaf value and ends up
returning incorrect information. Change the call from AsmCpuid() to
AsmCpuidEx().
- When sorting the CPUs by APIC ID, the VMSA associated with the vCPU
should follow the APIC ID. Update the sorting code to swap the VMSA
pointer during the sort.
---
These patches are based on commit:
da219919538b ("BaseTools: GenFw: auto-set nxcompat flag")
Tom Lendacky (2):
UefiCpuPkg/MpInitLib: Use AsmCpuidEx() for CPUID_EXTENDED_TOPOLOGY
leaf
UefiCpuPkg/MpInitLib: Copy SEV-ES save area pointer during APIC ID
sorting
UefiCpuPkg/Library/MpInitLib/AmdSev.c | 9 ++++++++-
UefiCpuPkg/Library/MpInitLib/MpLib.c | 8 +++++++-
2 files changed, 15 insertions(+), 2 deletions(-)
--
2.42.0
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