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UefiCpuPkg/MpInitLib: Use SEV-SNP AP Creation NAE event to launch APs

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BZ: https://bugzilla.tianocore.org/show_bug.cgi?id=3275

Use the SEV-SNP AP Creation NAE event to create and launch APs under
SEV-SNP. This capability will be advertised in the SEV Hypervisor
Feature Support PCD (PcdSevEsHypervisorFeatures).

Cc: Michael Roth <michael.roth@amd.com>
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: Ray Ni <ray.ni@intel.com>
Acked-by: Gerd Hoffmann <kraxel@redhat.com>
Signed-off-by: Tom Lendacky <thomas.lendacky@amd.com>
Signed-off-by: Brijesh Singh <brijesh.singh@amd.com>
This commit is contained in:
Tom Lendacky
2021-12-09 11:28:00 +08:00
committed by mergify[bot]
parent 67484aed69
commit 06544455d0
7 changed files with 433 additions and 22 deletions
Download Patch File Download Diff File Expand all files Collapse all files

13
UefiCpuPkg/Library/MpInitLib/DxeMpLib.c
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@@ -93,7 +93,14 @@ GetWakeupBuffer (
EFI_PHYSICAL_ADDRESS StartAddress;
EFI_MEMORY_TYPE MemoryType;
if (ConfidentialComputingGuestHas (CCAttrAmdSevEs)) {
if (ConfidentialComputingGuestHas (CCAttrAmdSevEs) &&
!ConfidentialComputingGuestHas (CCAttrAmdSevSnp))
{
//
// An SEV-ES-only guest requires the memory to be reserved. SEV-SNP, which
// is also considered SEV-ES, uses a different AP startup method, though,
// which does not have the same requirement.
//
MemoryType = EfiReservedMemoryType;
} else {
MemoryType = EfiBootServicesData;
@@ -380,7 +387,7 @@ RelocateApLoop (
MpInitLibWhoAmI (&ProcessorNumber);
CpuMpData = GetCpuMpData ();
MwaitSupport = IsMwaitSupport ();
if (CpuMpData->SevEsIsEnabled) {
if (CpuMpData->UseSevEsAPMethod) {
StackStart = CpuMpData->SevEsAPResetStackStart;
} else {
StackStart = mReservedTopOfApStack;
@@ -430,7 +437,7 @@ MpInitChangeApLoopCallback (
CpuPause ();
}
if (CpuMpData->SevEsIsEnabled && (CpuMpData->WakeupBuffer != (UINTN)-1)) {
if (CpuMpData->UseSevEsAPMethod && (CpuMpData->WakeupBuffer != (UINTN)-1)) {
//
// There are APs present. Re-use reserved memory area below 1MB from
// WakeupBuffer as the area to be used for transitioning to 16-bit mode