qemu: Add qemuAssignDeviceShmemAlias and use it

Signed-off-by: Martin Kletzander <mkletzan@redhat.com>

src/qemu/qemu_alias.c

@@ -352,6 +352,36 @@ qemuAssignDeviceMemoryAlias(virDomainDefPtr def,
 }
 
 
+int
+qemuAssignDeviceShmemAlias(virDomainDefPtr def,
+                           virDomainShmemDefPtr shmem,
+                           int idx)
+{
+    if (idx == -1) {
+        size_t i;
+        idx = 0;
+        for (i = 0; i < def->nshmems; i++) {
+            int thisidx;
+
+            if ((thisidx = qemuDomainDeviceAliasIndex(&def->shmems[i]->info,
+                                                      "shmem")) < 0) {
+                virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
+                               _("Unable to determine device index "
+                                 "for shmem device"));
+                return -1;
+            }
+
+            if (thisidx >= idx)
+                idx = thisidx + 1;
+        }
+    }
+
+    if (virAsprintf(&shmem->info.alias, "shmem%d", idx) < 0)
+        return -1;
+    return 0;
+}
+
+
 int
 qemuAssignDeviceAliases(virDomainDefPtr def, virQEMUCapsPtr qemuCaps)
 {
@@ -421,7 +451,7 @@ qemuAssignDeviceAliases(virDomainDefPtr def, virQEMUCapsPtr qemuCaps)
             return -1;
     }
     for (i = 0; i < def->nshmems; i++) {
-        if (virAsprintf(&def->shmems[i]->info.alias, "shmem%zu", i) < 0)
+        if (qemuAssignDeviceShmemAlias(def, def->shmems[i], i) < 0)
             return -1;
     }
     for (i = 0; i < def->nsmartcards; i++) {

src/qemu/qemu_alias.h

@@ -60,6 +60,10 @@ int qemuAssignDeviceRNGAlias(virDomainDefPtr def,
 int qemuAssignDeviceMemoryAlias(virDomainDefPtr def,
                                 virDomainMemoryDefPtr mems);
 
+int qemuAssignDeviceShmemAlias(virDomainDefPtr def,
+                               virDomainShmemDefPtr shmem,
+                               int idx);
+
 int qemuAssignDeviceAliases(virDomainDefPtr def, virQEMUCapsPtr qemuCaps);
 
 int qemuDomainDeviceAliasIndex(const virDomainDeviceInfo *info,