i386/sev: Set CPU state to protected once SNP guest payload is finalized
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@amd.com>
Signed-off-by: Pankaj Gupta <pankaj.gupta@amd.com>
Message-ID: <20240530111643.1091816-18-pankaj.gupta@amd.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
diff --git a/target/i386/sev.c b/target/i386/sev.c
index ef2e592..e84e439 100644
--- a/target/i386/sev.c
+++ b/target/i386/sev.c
@@ -997,6 +997,7 @@
exit(1);
}
+ kvm_mark_guest_state_protected();
sev_set_guest_state(sev_common, SEV_STATE_RUNNING);
/* add migration blocker */
