[Qemu-devel] [RFC PATCH v2 11/16] sev: add LAUNCH_FINISH command

[Brijesh Singh <brijesh.singh@amd.com>]

The command is used to finalize the SEV guest launch process.

The command returns a measurement value of the data encrypted through
the LAUNCH_UPDATE command. This measurement can be handed to the guest
owner to verify that the guest was launched into SEV-enabled mode.

User can retrieve the measurement via 'measurement' property defined
in 'sev-launch-info' object.

Signed-off-by: Brijesh Singh <brijesh.singh@amd.com>
---
 sev.c |   17 +++++++++++++++--
 1 file changed, 15 insertions(+), 2 deletions(-)

diff --git a/sev.c b/sev.c
index dcd7c48..21c491c 100644
--- a/sev.c
+++ b/sev.c
@@ -955,7 +955,21 @@ sev_launch_start(SEVState *s)
 static int
 sev_launch_finish(SEVState *s)
 {
-    // add the command to finalize the launch in next patches
+    int ret;
+    struct kvm_sev_launch_finish *finish = s->launch_finish;
+
+    assert(s->state == SEV_STATE_LAUNCHING);
+
+    ret = sev_ioctl(KVM_SEV_LAUNCH_FINISH, finish);
+    if (ret) {
+        return -1;
+    }
+
+    DPRINTF("SEV: LAUNCH_FINISH ");
+    DPRINTF_U8_PTR(" measurement", finish->measurement,
+                   sizeof(finish->measurement));
+
+    s->state = SEV_STATE_RUNNING;
     return 0;
 }
 
@@ -1058,7 +1072,6 @@ sev_guest_launch_finish(void *handle)
 
     if (s->state == SEV_STATE_LAUNCHING) {
         return sev_launch_finish(s);
-        // use launch_finish commands
     } else if (s->state == SEV_STATE_RECEIVING) {
         // use receive_finish commands
     } else {