qemu: Prepare for 'sd' card use together with blockdev

SD cards need to be instantiated via -drive if=sd. This means that all
cases where we use the blockdev path need to be special-cased for SD
cards.

Note that at this point QEMU_CAPS_BLOCKDEV is still cleared if the VM
config has a SD card.

Signed-off-by: Peter Krempa <pkrempa@redhat.com>
Reviewed-by: Michal Privoznik <mprivozn@redhat.com>

src/qemu/qemu_command.c

@@ -2089,7 +2089,8 @@ qemuBuildDiskSourceCommandLine(virCommandPtr cmd,
     g_autofree char *copyOnReadPropsStr = NULL;
     size_t i;
 
-    if (virQEMUCapsGet(qemuCaps, QEMU_CAPS_BLOCKDEV)) {
+    if (virQEMUCapsGet(qemuCaps, QEMU_CAPS_BLOCKDEV) &&
+        !qemuDiskBusIsSD(disk->bus)) {
         if (virStorageSourceIsEmpty(disk->src))
             return 0;
 

src/qemu/qemu_domain.c

@@ -8212,6 +8212,8 @@ qemuDomainDetermineDiskChain(virQEMUDriverPtr driver,
     virStorageSourcePtr src; /* iterator for the backing chain declared in XML */
     virStorageSourcePtr n; /* iterator for the backing chain detected from disk */
     qemuDomainObjPrivatePtr priv = vm->privateData;
+    bool blockdev = virQEMUCapsGet(priv->qemuCaps, QEMU_CAPS_BLOCKDEV);
+    bool isSD = qemuDiskBusIsSD(disk->bus);
     uid_t uid;
     gid_t gid;
 
@@ -8294,13 +8296,14 @@ qemuDomainDetermineDiskChain(virQEMUDriverPtr driver,
         if (n->format == VIR_STORAGE_FILE_ISO)
             n->format = VIR_STORAGE_FILE_RAW;
 
-        if (qemuDomainValidateStorageSource(n, priv->qemuCaps, false) < 0)
+        /* mask-out blockdev for 'sd' disks */
+        if (qemuDomainValidateStorageSource(n, priv->qemuCaps, isSD) < 0)
             return -1;
 
         qemuDomainPrepareStorageSourceConfig(n, cfg, priv->qemuCaps);
         qemuDomainPrepareDiskSourceData(disk, n);
 
-        if (virQEMUCapsGet(priv->qemuCaps, QEMU_CAPS_BLOCKDEV) &&
+        if (blockdev && !isSD &&
             qemuDomainPrepareStorageSourceBlockdev(disk, n, priv, cfg) < 0)
             return -1;
     }
@@ -8358,7 +8361,8 @@ qemuDomainDiskGetBackendAlias(virDomainDiskDefPtr disk,
 {
     *backendAlias = NULL;
 
-    if (!virQEMUCapsGet(qemuCaps, QEMU_CAPS_BLOCKDEV)) {
+    if (!virQEMUCapsGet(qemuCaps, QEMU_CAPS_BLOCKDEV) ||
+        qemuDiskBusIsSD(disk->bus)) {
         if (!(*backendAlias = qemuAliasDiskDriveFromDisk(disk)))
             return -1;
 
@@ -13234,7 +13238,8 @@ qemuDomainPrepareDiskSource(virDomainDiskDefPtr disk,
             disk->src->format = VIR_STORAGE_FILE_RAW;
     }
 
-    if (virQEMUCapsGet(priv->qemuCaps, QEMU_CAPS_BLOCKDEV)) {
+    if (virQEMUCapsGet(priv->qemuCaps, QEMU_CAPS_BLOCKDEV) &&
+        !qemuDiskBusIsSD(disk->bus)) {
         if (qemuDomainPrepareDiskSourceBlockdev(disk, priv, cfg) < 0)
             return -1;
     } else {

src/qemu/qemu_driver.c

@@ -10808,7 +10808,8 @@ qemuDomainBlockResize(virDomainPtr dom,
         disk->src->format == VIR_STORAGE_FILE_QED)
         size = VIR_ROUND_UP(size, 512);
 
-    if (virQEMUCapsGet(priv->qemuCaps, QEMU_CAPS_BLOCKDEV)) {
+    if (virQEMUCapsGet(priv->qemuCaps, QEMU_CAPS_BLOCKDEV) &&
+        !qemuDiskBusIsSD(disk->bus)) {
         if (virStorageSourceIsEmpty(disk->src) || disk->src->readonly) {
             virReportError(VIR_ERR_OPERATION_UNSUPPORTED,
                            _("can't resize empty or readonly disk '%s'"),

src/qemu/qemu_hotplug.c

@@ -4270,7 +4270,8 @@ qemuDomainRemoveDiskDevice(virQEMUDriverPtr driver,
               disk->info.alias, vm, vm->def->name);
 
 
-    if (blockdev) {
+    if (blockdev &&
+        !qemuDiskBusIsSD(disk->bus)) {
         corAlias = g_strdup(diskPriv->nodeCopyOnRead);
 
         if (diskPriv->blockjob) {

src/qemu/qemu_process.c

@@ -6405,7 +6405,7 @@ qemuProcessPrepareHostStorage(virQEMUDriverPtr driver,
             continue;
 
         /* backing chain needs to be redetected if we aren't using blockdev */
-        if (!blockdev)
+        if (!blockdev || qemuDiskBusIsSD(disk->bus))
             virStorageSourceBackingStoreClear(disk->src);
 
         /*
@@ -6634,6 +6634,10 @@ qemuProcessSetupDiskThrottlingBlockdev(virQEMUDriverPtr driver,
         virDomainDiskDefPtr disk = vm->def->disks[i];
         qemuDomainDiskPrivatePtr diskPriv = QEMU_DOMAIN_DISK_PRIVATE(disk);
 
+        /* sd-cards are instantiated via -drive */
+        if (qemuDiskBusIsSD(disk->bus))
+            continue;
+
         if (!qemuDiskConfigBlkdeviotuneEnabled(disk))
             continue;
 

src/qemu/qemu_validate.c

@@ -2259,6 +2259,7 @@ qemuValidateDomainDeviceDefDisk(const virDomainDiskDef *disk,
                                 virQEMUCapsPtr qemuCaps)
 {
     const char *driverName = virDomainDiskGetDriver(disk);
+    bool isSD = qemuDiskBusIsSD(disk->bus);
     virStorageSourcePtr n;
     int idx;
     int partition;
@@ -2298,7 +2299,8 @@ qemuValidateDomainDeviceDefDisk(const virDomainDiskDef *disk,
     }
 
     for (n = disk->src; virStorageSourceIsBacking(n); n = n->backingStore) {
-        if (qemuDomainValidateStorageSource(n, qemuCaps, false) < 0)
+        /* blockdev support is masked out for 'sd' disks */
+        if (qemuDomainValidateStorageSource(n, qemuCaps, isSD) < 0)
             return -1;
     }