From: Tom Lendacky <thomas.lenda...@amd.com>
BZ: https://bugzilla.tianocore.org/show_bug.cgi?id=2198
Protect the SEV-ES work area memory used by an SEV-ES guest.
Regarding the lifecycle of the SEV-ES memory area:
PcdSevEsWorkArea
(a) when and how it is initialized after first boot of the VM
If SEV-ES is enabled, the SEV-ES area is initialized during
the SEC phase [OvmfPkg/ResetVector/Ia32/PageTables64.asm].
(b) how it is protected from memory allocations during DXE
If SEV-ES is enabled, then InitializeRamRegions()
[OvmfPkg/PlatformPei/MemDetect.c] protects the ranges with either
an AcpiNVS (S3 enabled) or BootServicesData (S3 disabled) memory
allocation HOB, in PEI.
(c) how it is protected from the OS
If S3 is enabled, then (b) reserves it from the OS too.
If S3 is disabled, then the range needs no protection.
(d) how it is accessed on the S3 resume path
It is rewritten same as in (a), which is fine because (b) reserved it.
(e) how it is accessed on the warm reset path
It is rewritten same as in (a).
Cc: Jordan Justen <jordan.l.jus...@intel.com>
Cc: Laszlo Ersek <ler...@redhat.com>
Cc: Ard Biesheuvel <ard.biesheu...@arm.com>
Cc: Anthony Perard <anthony.per...@citrix.com>
Cc: Julien Grall <jul...@xen.org>
Reviewed-by: Laszlo Ersek <ler...@redhat.com>
Signed-off-by: Tom Lendacky <thomas.lenda...@amd.com>
---
OvmfPkg/PlatformPei/PlatformPei.inf | 2 ++
OvmfPkg/PlatformPei/MemDetect.c | 20 ++++++++++++++++++++
2 files changed, 22 insertions(+)
diff --git a/OvmfPkg/PlatformPei/PlatformPei.inf
b/OvmfPkg/PlatformPei/PlatformPei.inf
index 4742e1bdf42b..c53be2f4925c 100644
--- a/OvmfPkg/PlatformPei/PlatformPei.inf
+++ b/OvmfPkg/PlatformPei/PlatformPei.inf
@@ -118,6 +118,8 @@ [FixedPcd]
gEmbeddedTokenSpaceGuid.PcdMemoryTypeEfiReservedMemoryType
gEmbeddedTokenSpaceGuid.PcdMemoryTypeEfiRuntimeServicesCode
gEmbeddedTokenSpaceGuid.PcdMemoryTypeEfiRuntimeServicesData
+ gUefiCpuPkgTokenSpaceGuid.PcdSevEsWorkAreaBase
+ gUefiCpuPkgTokenSpaceGuid.PcdSevEsWorkAreaSize
[FeaturePcd]
gUefiOvmfPkgTokenSpaceGuid.PcdCsmEnable
diff --git a/OvmfPkg/PlatformPei/MemDetect.c b/OvmfPkg/PlatformPei/MemDetect.c
index 6b5fee166b5d..ffbbef891a11 100644
--- a/OvmfPkg/PlatformPei/MemDetect.c
+++ b/OvmfPkg/PlatformPei/MemDetect.c
@@ -940,5 +940,25 @@ InitializeRamRegions (
);
}
}
+
+#ifdef MDE_CPU_X64
+ if (MemEncryptSevEsIsEnabled ()) {
+ //
+ // If SEV-ES is enabled, reserve the SEV-ES work area.
+ //
+ // Since this memory range will be used by the Reset Vector on S3
+ // resume, it must be reserved as ACPI NVS.
+ //
+ // If S3 is unsupported, then various drivers might still write to the
+ // work area. We ought to prevent DXE from serving allocation requests
+ // such that they would overlap the work area.
+ //
+ BuildMemoryAllocationHob (
+ (EFI_PHYSICAL_ADDRESS)(UINTN) FixedPcdGet32 (PcdSevEsWorkAreaBase),
+ (UINT64)(UINTN) FixedPcdGet32 (PcdSevEsWorkAreaSize),
+ mS3Supported ? EfiACPIMemoryNVS : EfiBootServicesData
+ );
+ }
+#endif
}
}
--
2.27.0
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