[PATCH v3 39/49] i386/sev: Set CPU state to protected once SNP guest payload is finalized

[Michael Roth <michael.roth@xxxxxxx>]

Once KVM_SNP_LAUNCH_FINISH is called the vCPU state is copied into the
vCPU's VMSA page and measured/encrypted. Any attempt to read/write CPU
state afterward will only be acting on the initial data and so are
effectively no-ops.

Set the vCPU state to protected at this point so that QEMU don't
continue trying to re-sync vCPU data during guest runtime.

Signed-off-by: Michael Roth <michael.roth@xxxxxxx>
---
 target/i386/sev.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/target/i386/sev.c b/target/i386/sev.c
index 4155342e72..4d862eef78 100644
--- a/target/i386/sev.c
+++ b/target/i386/sev.c
@@ -975,6 +975,7 @@ sev_snp_launch_finish(SevSnpGuestState *sev_snp)
         exit(1);
     }
 
+    kvm_mark_guest_state_protected();
     sev_set_guest_state(SEV_COMMON(sev_snp), SEV_STATE_RUNNING);
 
     /* add migration blocker */
-- 
2.25.1