[edk2-devel] [PATCH 3/9] OvmfPkg/VmgExitLib: Set the SwScratch valid bit for IOIO events

[Lendacky, Thomas]

From: Tom Lendacky <thomas.lendacky at amd.com>

All fields that are set in the GHCB should have their associated bit in
the GHCB ValidBitmap field set. Add support to set the bit for the scratch
area field (SwScratch).

Fixes: 0020157a9825 ("OvmfPkg/VmgExitLib: Support string IO for IOIO_PROT NAE events")
Cc: Jordan Justen <jordan.l.justen at intel.com>
Cc: Laszlo Ersek <lersek at redhat.com>
Cc: Ard Biesheuvel <ard.biesheuvel at arm.com>
Cc: Tom Lendacky <thomas.lendacky at amd.com>
Cc: Brijesh Singh <brijesh.singh at amd.com>
Signed-off-by: Tom Lendacky <thomas.lendacky at amd.com>
---
 OvmfPkg/Library/VmgExitLib/VmgExitVcHandler.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/OvmfPkg/Library/VmgExitLib/VmgExitVcHandler.c b/OvmfPkg/Library/VmgExitLib/VmgExitVcHandler.c
index c5484a3f478c..40120e29af18 100644
--- a/OvmfPkg/Library/VmgExitLib/VmgExitVcHandler.c
+++ b/OvmfPkg/Library/VmgExitLib/VmgExitVcHandler.c
@@ -1289,6 +1289,7 @@ IoioExit (
       }
 
       Ghcb->SaveArea.SwScratch = (UINT64) Ghcb->SharedBuffer;
+      GhcbSetRegValid (Ghcb, GhcbSwScratch);
       Status = VmgExit (Ghcb, SVM_EXIT_IOIO_PROT, ExitInfo1, ExitInfo2);
       if (Status != 0) {
         return Status;
-- 
2.28.0



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