qemu: Store updated CPU in save cookie

Since the domain XML saved in a snapshot or saved image uses the
original guest CPU definition but we still want to enforce ABI when
restoring the domain if libvirt and QEMU are new enough, we save the
live updated CPU definition in a save cookie.

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

diff --git a/src/qemu/qemu_domain.c b/src/qemu/qemu_domain.c
index 0da44f0662cd9841c6718794f9371d7a0ef8ac59..ec43d06d73f9d893dbe0e1992080c886b008f8ab 100644 (file)
--- a/src/qemu/qemu_domain.c
+++ b/src/qemu/qemu_domain.c
@@ -9167,12 +9167,15 @@ qemuDomainSaveCookieDispose(void *obj)
     qemuDomainSaveCookiePtr cookie = obj;
 
     VIR_DEBUG("cookie=%p", cookie);
+
+    virCPUDefFree(cookie->cpu);
 }
 
 
 qemuDomainSaveCookiePtr
 qemuDomainSaveCookieNew(virDomainObjPtr vm ATTRIBUTE_UNUSED)
 {
+    qemuDomainObjPrivatePtr priv = vm->privateData;
     qemuDomainSaveCookiePtr cookie = NULL;
 
     if (qemuDomainInitialize() < 0)
@@ -9181,7 +9184,10 @@ qemuDomainSaveCookieNew(virDomainObjPtr vm ATTRIBUTE_UNUSED)
     if (!(cookie = virObjectNew(qemuDomainSaveCookieClass)))
         goto error;
 
-    VIR_DEBUG("Save cookie %p", cookie);
+    if (priv->origCPU && !(cookie->cpu = virCPUDefCopy(vm->def->cpu)))
+        goto error;
+
+    VIR_DEBUG("Save cookie %p, cpu=%p", cookie, cookie->cpu);
 
     return cookie;
 
@@ -9203,6 +9209,10 @@ qemuDomainSaveCookieParse(xmlXPathContextPtr ctxt ATTRIBUTE_UNUSED,
     if (!(cookie = virObjectNew(qemuDomainSaveCookieClass)))
         goto error;
 
+    if (virCPUDefParseXML(ctxt, "./cpu[1]", VIR_CPU_TYPE_GUEST,
+                          &cookie->cpu) < 0)
+        goto error;
+
     *obj = (virObjectPtr) cookie;
     return 0;
 
@@ -9213,9 +9223,15 @@ qemuDomainSaveCookieParse(xmlXPathContextPtr ctxt ATTRIBUTE_UNUSED,
 
 
 static int
-qemuDomainSaveCookieFormat(virBufferPtr buf ATTRIBUTE_UNUSED,
-                           virObjectPtr obj ATTRIBUTE_UNUSED)
+qemuDomainSaveCookieFormat(virBufferPtr buf,
+                           virObjectPtr obj)
 {
+    qemuDomainSaveCookiePtr cookie = (qemuDomainSaveCookiePtr) obj;
+
+    if (cookie->cpu &&
+        virCPUDefFormatBufFull(buf, cookie->cpu, NULL, false) < 0)
+        return -1;
+
     return 0;
 }
 

diff --git a/src/qemu/qemu_domain.h b/src/qemu/qemu_domain.h
index 08c0b32f1b933343b4485077e81b265c37e82548..44c466cb75dcefdc77e3381e9718413f5162db17 100644 (file)
--- a/src/qemu/qemu_domain.h
+++ b/src/qemu/qemu_domain.h
@@ -424,6 +424,8 @@ typedef struct _qemuDomainSaveCookie qemuDomainSaveCookie;
 typedef qemuDomainSaveCookie *qemuDomainSaveCookiePtr;
 struct _qemuDomainSaveCookie {
     virObject parent;
+
+    virCPUDefPtr cpu;
 };
 
 qemuDomainSaveCookiePtr qemuDomainSaveCookieNew(virDomainObjPtr vm);