[PATCH v6 5/6] OvmfPkg/PlatformPei: Mark SEC GHCB page as unencrypted via hypercall


Ashish Kalra
 

From: Ashish Kalra <ashish.kalra@...>

Mark the SEC GHCB page (that is mapped as unencrypted in
ResetVector code) in the hypervisor's guest page encryption
state tracking.

Cc: Jordan Justen <jordan.l.justen@...>
Cc: Ard Biesheuvel <ard.biesheuvel@...>
Signed-off-by: Ashish Kalra <ashish.kalra@...>
---
OvmfPkg/PlatformPei/AmdSev.c | 11 +++++++++++
1 file changed, 11 insertions(+)

diff --git a/OvmfPkg/PlatformPei/AmdSev.c b/OvmfPkg/PlatformPei/AmdSev.c
index a8bf610022..1d38056ec0 100644
--- a/OvmfPkg/PlatformPei/AmdSev.c
+++ b/OvmfPkg/PlatformPei/AmdSev.c
@@ -52,6 +52,17 @@ AmdSevEsInitialize (
PcdStatus = PcdSetBoolS (PcdSevEsIsEnabled, TRUE);
ASSERT_RETURN_ERROR (PcdStatus);

+ //
+ // The SEC Ghcb setup during reset-vector needs to be marked as
+ // decrypted in the hypervisor's guest page encryption state
+ // tracking.
+ //
+ SetMemoryEncDecHypercall3 (
+ FixedPcdGet32 (PcdOvmfSecGhcbBase),
+ EFI_SIZE_TO_PAGES(FixedPcdGet32 (PcdOvmfSecGhcbSize)),
+ FALSE
+ );
+
//
// Allocate GHCB and per-CPU variable pages.
// Since the pages must survive across the UEFI to OS transition
--
2.17.1

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