qemu: Setup host side of VDPA device for block copy

Setup the VDPA bits of the appropriate part of the image chain for block
copy.

Signed-off-by: Peter Krempa <pkrempa@redhat.com>
Reviewed-by: Ján Tomko <jtomko@redhat.com>

src/qemu/qemu_block.c

@@ -23,6 +23,7 @@
 #include "qemu_domain.h"
 #include "qemu_alias.h"
 #include "qemu_security.h"
+#include "qemu_process.h"
 
 #include "storage_source.h"
 #include "viralloc.h"
@@ -3675,6 +3676,9 @@ qemuBlockPivot(virDomainObj *vm,
                 virQEMUCapsGet(priv->qemuCaps, QEMU_CAPS_BLOCKDEV_SNAPSHOT_ALLOW_WRITE_ONLY) &&
                 virStorageSourceHasBacking(disk->mirror)) {
 
+                if (qemuProcessPrepareHostStorageSourceChain(vm, disk->mirror->backingStore) < 0)
+                    return -1;
+
                 if (!(chainattachdata = qemuBuildStorageSourceChainAttachPrepareBlockdev(disk->mirror->backingStore)))
                     return -1;
 

src/qemu/qemu_driver.c

@@ -14290,10 +14290,16 @@ qemuDomainBlockCopyCommon(virDomainObj *vm,
         if (virQEMUCapsGet(priv->qemuCaps, QEMU_CAPS_BLOCKDEV_SNAPSHOT_ALLOW_WRITE_ONLY)) {
             g_autoptr(virStorageSource) terminator = virStorageSourceNew();
 
+            if (qemuProcessPrepareHostStorageSource(vm, mirror) < 0)
+                goto endjob;
+
             if (!(data = qemuBuildStorageSourceChainAttachPrepareBlockdevTop(mirror,
                                                                              terminator)))
                 goto endjob;
         } else {
+            if (qemuProcessPrepareHostStorageSourceChain(vm, mirror) < 0)
+                goto endjob;
+
             if (!(data = qemuBuildStorageSourceChainAttachPrepareBlockdev(mirror)))
                 goto endjob;
         }
@@ -14308,6 +14314,9 @@ qemuDomainBlockCopyCommon(virDomainObj *vm,
         if (mirror_shallow) {
             /* if external backing store is populated we'll need to open it */
             if (virStorageSourceHasBacking(mirror)) {
+                if (qemuProcessPrepareHostStorageSourceChain(vm, mirror->backingStore) < 0)
+                    goto endjob;
+
                 if (!(data = qemuBuildStorageSourceChainAttachPrepareBlockdev(mirror->backingStore)))
                     goto endjob;
 
@@ -14321,6 +14330,9 @@ qemuDomainBlockCopyCommon(virDomainObj *vm,
             mirrorBacking = mirror->backingStore;
         }
 
+        if (qemuProcessPrepareHostStorageSource(vm, mirror) < 0)
+            goto endjob;
+
         if (!(crdata = qemuBuildStorageSourceChainAttachPrepareBlockdevTop(mirror,
                                                                            mirrorBacking)))
             goto endjob;