[edk2-devel] [PATCH v2 3/3] OvmfPkg/PlatformPei: Mark SEC GHCB page in the page encryption bitmap.
Ashish Kalra
ashish.kalra at amd.com
Thu Dec 3 22:27:39 UTC 2020
From: Ashish Kalra <ashish.kalra at amd.com>
Mark the SEC GHCB page that is mapped as unencrypted in
ResetVector code in the hypervisor page encryption bitmap.
Cc: Jordan Justen <jordan.l.justen at intel.com>
Cc: Laszlo Ersek <lersek at redhat.com>
Cc: Ard Biesheuvel <ard.biesheuvel at arm.com>
Signed-off-by: Ashish Kalra <ashish.kalra at amd.com>
---
OvmfPkg/PlatformPei/AmdSev.c | 10 ++++++++++
1 file changed, 10 insertions(+)
diff --git a/OvmfPkg/PlatformPei/AmdSev.c b/OvmfPkg/PlatformPei/AmdSev.c
index 4a515a4847..456d32be84 100644
--- a/OvmfPkg/PlatformPei/AmdSev.c
+++ b/OvmfPkg/PlatformPei/AmdSev.c
@@ -15,6 +15,7 @@
#include <Library/HobLib.h>
#include <Library/MemEncryptSevLib.h>
#include <Library/MemoryAllocationLib.h>
+#include <Library/MemEncryptHypercallLib.h>
#include <Library/PcdLib.h>
#include <PiPei.h>
#include <Register/Amd/Cpuid.h>
@@ -77,6 +78,15 @@ AmdSevEsInitialize (
ZeroMem (GhcbBase, EFI_PAGES_TO_SIZE (GhcbPageCount));
+ //
+ // GHCB_BASE setup during reset-vector needs to be marked as
+ // decrypted in the hypervisor page encryption bitmap.
+ //
+ SetMemoryEncDecHypercall3 (FixedPcdGet32 (PcdOvmfSecGhcbBase),
+ EFI_SIZE_TO_PAGES(FixedPcdGet32 (PcdOvmfSecGhcbSize)),
+ FALSE
+ );
+
PcdStatus = PcdSet64S (PcdGhcbBase, GhcbBasePa);
ASSERT_RETURN_ERROR (PcdStatus);
PcdStatus = PcdSet64S (PcdGhcbSize, EFI_PAGES_TO_SIZE (GhcbPageCount));
--
2.17.1
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