[PATCH 5/6] qemu: Use correct host model for updating guest cpu

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when a user requested a domain xml description with
vir_domain_xml_update_cpu flag, libvirt would use the host cpu
definition from host capabilities rather than the one which will
actually be used once the domain is started.

https://bugzilla.redhat.com/show_bug.cgi?id=1481309

Signed-off-by: Jiri Denemark <jdenemar@xxxxxxxxxx>
---
 src/qemu/qemu_domain.c | 11 ++++++++++-
 1 file changed, 10 insertions(+), 1 deletion(-)

diff --git a/src/qemu/qemu_domain.c b/src/qemu/qemu_domain.c
index aba4111ba2..74284f40c1 100644
--- a/src/qemu/qemu_domain.c
+++ b/src/qemu/qemu_domain.c
@@ -4553,6 +4553,7 @@ qemuDomainDefFormatBufInternal(virQEMUDriverPtr driver,
     int ret = -1;
     virDomainDefPtr copy = NULL;
     virCapsPtr caps = NULL;
+    virQEMUCapsPtr qemuCaps = NULL;
 
     if (!(caps = virQEMUDriverGetCapabilities(driver, false)))
         goto cleanup;
@@ -4571,7 +4572,14 @@ qemuDomainDefFormatBufInternal(virQEMUDriverPtr driver,
         def->cpu &&
         (def->cpu->mode != VIR_CPU_MODE_CUSTOM ||
          def->cpu->model)) {
-        if (virCPUUpdate(def->os.arch, def->cpu, caps->host.cpu) < 0)
+        if (!(qemuCaps = virQEMUCapsCacheLookupCopy(driver->qemuCapsCache,
+                                                    def->emulator,
+                                                    def->os.machine)))
+            goto cleanup;
+
+        if (virCPUUpdate(def->os.arch, def->cpu,
+                         virQEMUCapsGetHostModel(qemuCaps, def->virtType,
+                                                 VIR_QEMU_CAPS_HOST_CPU_MIGRATABLE)) < 0)
             goto cleanup;
     }
 
@@ -4689,6 +4697,7 @@ qemuDomainDefFormatBufInternal(virQEMUDriverPtr driver,
  cleanup:
     virDomainDefFree(copy);
     virObjectUnref(caps);
+    virObjectUnref(qemuCaps);
     return ret;
 }
 
-- 
2.14.1

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