mirror of https://github.com/acidanthera/audk.git
d4d7c9ad5f
During AP bringup, just after switching to long mode, APs will do some cpuid calls to verify that the extended topology leaf (0xB) is available so they can fetch their x2 APIC IDs from it. In the case of SEV-ES, these cpuid instructions must be handled by direct use of the GHCB MSR protocol to fetch the values from the hypervisor, since a #VC handler is not yet available due to the AP's stack not being set up yet. For SEV-SNP, rather than relying on the GHCB MSR protocol, it is expected that these values would be obtained from the SEV-SNP CPUID table instead. The actual x2 APIC ID (and 8-bit APIC IDs) would still be fetched from hypervisor using the GHCB MSR protocol however, so introducing support for the SEV-SNP CPUID table in that part of the AP bring-up code would only be to handle the checks/validation of the extended topology leaf. Rather than introducing all the added complexity needed to handle these checks via the CPUID table, instead let the BSP do the check in advance, since it can make use of the #VC handler to avoid the need to scan the SNP CPUID table directly, and add a flag in ExchangeInfo to communicate the result of this check to APs. Cc: Eric Dong <eric.dong@intel.com> Cc: Ray Ni <ray.ni@intel.com> Cc: Rahul Kumar <rahul1.kumar@intel.com> 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> Cc: Gerd Hoffmann <kraxel@redhat.com> Acked-by: Gerd Hoffmann <kraxel@redhat.com> Acked-by: Ray Ni <ray.ni@intel.com> Suggested-by: Brijesh Singh <brijesh.singh@amd.com> Signed-off-by: Michael Roth <michael.roth@amd.com> Signed-off-by: Brijesh Singh <brijesh.singh@amd.com> |
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| .. | ||
| BaseUefiCpuLib | ||
| BaseXApicLib | ||
| BaseXApicX2ApicLib | ||
| CpuCacheInfoLib | ||
| CpuCommonFeaturesLib | ||
| CpuExceptionHandlerLib | ||
| CpuTimerLib | ||
| MicrocodeLib | ||
| MpInitLib | ||
| MpInitLibUp | ||
| MtrrLib | ||
| PlatformSecLibNull | ||
| RegisterCpuFeaturesLib | ||
| SecPeiDxeTimerLibUefiCpu | ||
| SmmCpuFeaturesLib | ||
| SmmCpuPlatformHookLibNull | ||
| VmgExitLibNull | ||