qemu: Do not skip virCPUUpdateLive if priv->origCPU is set

Even though we got both the original CPU (used for starting a domain)
and the updated version (the CPU really provided by QEMU) during
incoming migration, restore, or snapshot revert, we still need to update
the CPU according to the data we got from the freshly started QEMU.
Otherwise we don't know whether the CPU we got from QEMU matches the one
before migration. We just need to keep the original CPU in
priv->origCPU.

Messed up by me in v3.4.0-58-g8e34f4781.

Signed-off-by: Jiri Denemark <jdenemar@redhat.com>
Reviewed-by: Pavel Hrdina <phrdina@redhat.com>

diff --git a/src/qemu/qemu_process.c b/src/qemu/qemu_process.c
index 3b7f20be46185f1fc6ccb0fea8eadef66fd4a00c..f1447c33db76427461d3cdc40cae4a9ac480d688 100644 (file)
--- a/src/qemu/qemu_process.c
+++ b/src/qemu/qemu_process.c
@@ -3989,20 +3989,16 @@ qemuProcessUpdateLiveGuestCPU(virQEMUDriverPtr driver,
         if (qemuProcessVerifyCPUFeatures(def, cpu) < 0)
             goto cleanup;
 
-        /* Don't update the CPU if we already did so when starting a domain
-         * during migration, restore or snapshot revert. */
-        if (priv->origCPU) {
-            ret = 0;
-            goto cleanup;
-        }
-
         if (!(orig = virCPUDefCopy(def->cpu)))
             goto cleanup;
 
         if ((rc = virCPUUpdateLive(def->os.arch, def->cpu, cpu, disabled)) < 0) {
             goto cleanup;
         } else if (rc == 0) {
-            if (!virCPUDefIsEqual(def->cpu, orig, false))
+            /* Store the original CPU in priv if QEMU changed it and we didn't
+             * get the original CPU via migration, restore, or snapshot revert.
+             */
+            if (!priv->origCPU && !virCPUDefIsEqual(def->cpu, orig, false))
                 VIR_STEAL_PTR(priv->origCPU, orig);
 
             def->cpu->check = VIR_CPU_CHECK_FULL;