[PATCH v6 4/6] OvmfPkg/VmgExitLib: Encryption state change hypercall support in VC handler


Ashish Kalra
 

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

Make the #VC handler aware of the page encryption state
change hypercall by adding support to check KVM_HC_MAP_GPA_RANGE
hypercall and add the additional register values used by
hypercall in the GHCB.

Cc: Jordan Justen <jordan.l.justen@...>
Cc: Ard Biesheuvel <ard.biesheuvel@...>
Signed-off-by: Ashish Kalra <ashish.kalra@...>
---
OvmfPkg/Library/VmgExitLib/VmgExitVcHandler.c | 13 +++++++++++++
1 file changed, 13 insertions(+)

diff --git a/OvmfPkg/Library/VmgExitLib/VmgExitVcHandler.c b/OvmfPkg/Library/VmgExitLib/VmgExitVcHandler.c
index 41b0c8cc53..2d06343e92 100644
--- a/OvmfPkg/Library/VmgExitLib/VmgExitVcHandler.c
+++ b/OvmfPkg/Library/VmgExitLib/VmgExitVcHandler.c
@@ -1171,6 +1171,19 @@ VmmCallExit (
Ghcb->SaveArea.Cpl = (UINT8) (Regs->Cs & 0x3);
VmgSetOffsetValid (Ghcb, GhcbCpl);

+ if (Regs->Rax == KVM_HC_MAP_GPA_RANGE) {
+ //
+ // KVM_HC_MAP_GPA_RANGE hypercall requires these
+ // extra registers.
+ //
+ Ghcb->SaveArea.Rbx = Regs->Rbx;
+ VmgSetOffsetValid (Ghcb, GhcbRbx);
+ Ghcb->SaveArea.Rcx = Regs->Rcx;
+ VmgSetOffsetValid (Ghcb, GhcbRcx);
+ Ghcb->SaveArea.Rdx = Regs->Rdx;
+ VmgSetOffsetValid (Ghcb, GhcbRdx);
+ }
+
Status = VmgExit (Ghcb, SVM_EXIT_VMMCALL, 0, 0);
if (Status != 0) {
return Status;
--
2.17.1

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