audk/UefiCpuPkg
Michael Roth d4d7c9ad5f UefiCpuPkg/MpInitLib: use BSP to do extended topology check
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>
2021-12-09 06:28:10 +00:00
..
Application/Cpuid UefiCpuPkg: Apply uncrustify changes 2021-12-07 17:24:28 +00:00
CpuDxe UefiCpuPkg: Apply uncrustify changes 2021-12-07 17:24:28 +00:00
CpuFeatures UefiCpuPkg: Apply uncrustify changes 2021-12-07 17:24:28 +00:00
CpuIo2Dxe UefiCpuPkg: Apply uncrustify changes 2021-12-07 17:24:28 +00:00
CpuIo2Smm UefiCpuPkg: Apply uncrustify changes 2021-12-07 17:24:28 +00:00
CpuIoPei UefiCpuPkg: Apply uncrustify changes 2021-12-07 17:24:28 +00:00
CpuMpPei UefiCpuPkg: Apply uncrustify changes 2021-12-07 17:24:28 +00:00
CpuS3DataDxe UefiCpuPkg: Apply uncrustify changes 2021-12-07 17:24:28 +00:00
Include UefiCpuPkg: Apply uncrustify changes 2021-12-07 17:24:28 +00:00
Library UefiCpuPkg/MpInitLib: use BSP to do extended topology check 2021-12-09 06:28:10 +00:00
PiSmmCommunication UefiCpuPkg: Apply uncrustify changes 2021-12-07 17:24:28 +00:00
PiSmmCpuDxeSmm UefiCpuPkg: Apply uncrustify changes 2021-12-07 17:24:28 +00:00
ResetVector UefiCpuPkg: VTF0 Linear-Address Translation to a 1-GByte Page till 512GB 2021-09-16 14:18:27 +00:00
SecCore UefiCpuPkg: Apply uncrustify changes 2021-12-07 17:24:28 +00:00
SecMigrationPei UefiCpuPkg: Apply uncrustify changes 2021-12-07 17:24:28 +00:00
Test UefiCpuPkg/MtrrLib/UnitTest: Add host based unit test 2020-08-12 11:38:37 +00:00
Universal/Acpi/S3Resume2Pei UefiCpuPkg: Apply uncrustify changes 2021-12-07 17:24:28 +00:00
UefiCpuPkg.ci.yaml UefiCpuPkg: VTF0 Linear-Address Translation to a 1-GByte Page till 512GB 2021-09-16 14:18:27 +00:00
UefiCpuPkg.dec UefiCpuPkg: add PcdGhcbHypervisorFeatures 2021-12-09 06:28:10 +00:00
UefiCpuPkg.dsc UefiCpuPkg: SecCoreNative without ResetVector 2021-09-18 08:22:52 +00:00
UefiCpuPkg.uni UefiCpuPkg: Create an SEV-ES workarea PCD 2020-08-17 02:46:39 +00:00
UefiCpuPkgExtra.uni UefiCpuPkg: Replace BSD License with BSD+Patent License 2019-04-09 10:58:28 -07:00