[PATCH v5 19/23] sev: Finalize the SEV guest launch flow

[Brijesh Singh <brijesh.singh@xxxxxxx>]

SEV launch flow requires us to issue LAUNCH_FINISH command before guest
is ready to run.

Cc: Paolo Bonzini <pbonzini@xxxxxxxxxx>
Cc: kvm@xxxxxxxxxxxxxxx
Signed-off-by: Brijesh Singh <brijesh.singh@xxxxxxx>
---
 accel/kvm/sev.c | 30 ++++++++++++++++++++++++++++++
 1 file changed, 30 insertions(+)

diff --git a/accel/kvm/sev.c b/accel/kvm/sev.c
index c0eea371fa06..fbbd99becc0a 100644
--- a/accel/kvm/sev.c
+++ b/accel/kvm/sev.c
@@ -454,6 +454,35 @@ static Notifier sev_machine_done_notify = {
     .notify = sev_launch_get_measure,
 };
 
+static void
+sev_launch_finish(SEVState *s)
+{
+    int ret, error;
+
+    ret = sev_ioctl(KVM_SEV_LAUNCH_FINISH, 0, &error);
+    if (ret) {
+        error_report("%s: LAUNCH_FINISH ret=%d fw_error=%d '%s'",
+                     __func__, ret, error, fw_error_to_str(error));
+        exit(1);
+    }
+
+    s->cur_state = SEV_STATE_RUNNING;
+    DPRINTF("SEV: LAUNCH_FINISH\n");
+}
+
+static void
+sev_vm_state_change(void *opaque, int running, RunState state)
+{
+    SEVState *s = opaque;
+
+    if (running) {
+        /* we are about to resume the guest, finalize the launch flow */
+        if (s->cur_state == SEV_STATE_SECRET) {
+            sev_launch_finish(s);
+        }
+    }
+}
+
 void *
 sev_guest_init(const char *id)
 {
@@ -497,6 +526,7 @@ sev_guest_init(const char *id)
 
     ram_block_notifier_add(&sev_ram_notifier);
     qemu_add_machine_init_done_notifier(&sev_machine_done_notify);
+    qemu_add_vm_change_state_handler(sev_vm_state_change, s);
 
     sev_state = s;
 
-- 
2.9.5