From: Tom Lendacky <thomas.lenda...@amd.com> A per-CPU implementation for holding values specific to a CPU when running as an SEV-ES guest, specifically to hold the Debug Register value. Allocate an extra page immediately after the GHCB page for each AP.
Using the page after the GHCB ensures that it is unique per AP. But, it also ends up being marked shared/unencrypted when it doesn't need to be. It is possible, during PEI, to mark only the GHCB pages as shared, but DXE is not as easy. There needs to be a way to change the pagetables created for DXE using CreateIdentityMappingPageTables() before switching to them. Signed-off-by: Tom Lendacky <thomas.lenda...@amd.com> --- OvmfPkg/OvmfPkgX64.fdf | 8 ++++---- OvmfPkg/PlatformPei/AmdSev.c | 2 +- 2 files changed, 5 insertions(+), 5 deletions(-) diff --git a/OvmfPkg/OvmfPkgX64.fdf b/OvmfPkg/OvmfPkgX64.fdf index 2a2427092382..3ba3d7384745 100644 --- a/OvmfPkg/OvmfPkgX64.fdf +++ b/OvmfPkg/OvmfPkgX64.fdf @@ -70,13 +70,13 @@ [FD.MEMFD] 0x000000|0x007000 gUefiOvmfPkgTokenSpaceGuid.PcdOvmfSecPageTablesBase|gUefiOvmfPkgTokenSpaceGuid.PcdOvmfSecPageTablesSize -0x007000|0x001000 +0x007000|0x002000 gUefiOvmfPkgTokenSpaceGuid.PcdOvmfSecGhcbBase|gUefiOvmfPkgTokenSpaceGuid.PcdOvmfSecGhcbSize -0x008000|0x001000 -gUefiOvmfPkgTokenSpaceGuid.PcdOvmfLockBoxStorageBase|gUefiOvmfPkgTokenSpaceGuid.PcdOvmfLockBoxStorageSize - 0x009000|0x001000 +gUefiOvmfPkgTokenSpaceGuid.PcdOvmfLockBoxStorageBase|gUefiOvmfPkgTokenSpaceGuid.PcdOvmfLockBoxStorageSize + +0x00A000|0x001000 gEfiMdePkgTokenSpaceGuid.PcdGuidedExtractHandlerTableAddress|gUefiOvmfPkgTokenSpaceGuid.PcdGuidedExtractHandlerTableSize 0x010000|0x010000 diff --git a/OvmfPkg/PlatformPei/AmdSev.c b/OvmfPkg/PlatformPei/AmdSev.c index 84896d4681f9..87ac842a1590 100644 --- a/OvmfPkg/PlatformPei/AmdSev.c +++ b/OvmfPkg/PlatformPei/AmdSev.c @@ -42,7 +42,7 @@ AmdSevEsInitialize ( return; } - GhcbPageCount = mMaxCpuCount; + GhcbPageCount = mMaxCpuCount * 2; // // Allocate GHCB pages. -- 2.17.1 -=-=-=-=-=-=-=-=-=-=-=- Groups.io Links: You receive all messages sent to this group. View/Reply Online (#46097): https://edk2.groups.io/g/devel/message/46097 Mute This Topic: https://groups.io/mt/32966269/21656 Mute #vc: https://groups.io/mk?hashtag=vc&subid=3846945 Group Owner: devel+ow...@edk2.groups.io Unsubscribe: https://edk2.groups.io/g/devel/unsub [arch...@mail-archive.com] -=-=-=-=-=-=-=-=-=-=-=-