qemu: capabilities: add 'packed' capability

Add the capability for QEMU's packed virtqueues for virtio that supposedly have
better cache utilization and performance compared to the default split queues.
Reviewed-by: NJán Tomko <jtomko@redhat.com>
Reviewed-by: NBoris Fiuczynski <fiuczy@linux.ibm.com>
Signed-off-by: NBjoern Walk <bwalk@linux.ibm.com>
Signed-off-by: NJán Tomko <jtomko@redhat.com>

src/qemu/qemu_capabilities.c

@@ -571,6 +571,7 @@ VIR_ENUM_IMPL(virQEMUCaps,
 
               /* 360 */
               "fsdev.multidevs",
+              "virtio.packed",
     );
 
 
@@ -1295,6 +1296,7 @@ static struct virQEMUCapsStringFlags virQEMUCapsDevicePropsVirtioBalloon[] = {
     { "disable-legacy", QEMU_CAPS_VIRTIO_PCI_DISABLE_LEGACY },
     { "iommu_platform", QEMU_CAPS_VIRTIO_PCI_IOMMU_PLATFORM },
     { "ats", QEMU_CAPS_VIRTIO_PCI_ATS },
+    { "packed", QEMU_CAPS_VIRTIO_PACKED_QUEUES },
 };
 
 static struct virQEMUCapsStringFlags virQEMUCapsDevicePropsVirtioBlk[] = {
@@ -1309,6 +1311,7 @@ static struct virQEMUCapsStringFlags virQEMUCapsDevicePropsVirtioBlk[] = {
     { "ats", QEMU_CAPS_VIRTIO_PCI_ATS },
     { "write-cache", QEMU_CAPS_DISK_WRITE_CACHE },
     { "werror", QEMU_CAPS_STORAGE_WERROR },
+    { "packed", QEMU_CAPS_VIRTIO_PACKED_QUEUES },
 };
 
 static struct virQEMUCapsStringFlags virQEMUCapsDevicePropsVirtioNet[] = {
@@ -1321,6 +1324,7 @@ static struct virQEMUCapsStringFlags virQEMUCapsDevicePropsVirtioNet[] = {
     { "iommu_platform", QEMU_CAPS_VIRTIO_PCI_IOMMU_PLATFORM },
     { "ats", QEMU_CAPS_VIRTIO_PCI_ATS },
     { "failover", QEMU_CAPS_VIRTIO_NET_FAILOVER },
+    { "packed", QEMU_CAPS_VIRTIO_PACKED_QUEUES },
 };
 
 static struct virQEMUCapsStringFlags virQEMUCapsDevicePropsSpaprPCIHostBridge[] = {
@@ -1332,6 +1336,7 @@ static struct virQEMUCapsStringFlags virQEMUCapsDevicePropsVirtioSCSI[] = {
     { "disable-legacy", QEMU_CAPS_VIRTIO_PCI_DISABLE_LEGACY },
     { "iommu_platform", QEMU_CAPS_VIRTIO_PCI_IOMMU_PLATFORM },
     { "ats", QEMU_CAPS_VIRTIO_PCI_ATS },
+    { "packed", QEMU_CAPS_VIRTIO_PACKED_QUEUES },
 };
 
 static struct virQEMUCapsStringFlags virQEMUCapsDevicePropsVfioPCI[] = {
@@ -1401,6 +1406,7 @@ static struct virQEMUCapsStringFlags virQEMUCapsDevicePropsVirtioGpu[] = {
     { "disable-legacy", QEMU_CAPS_VIRTIO_PCI_DISABLE_LEGACY },
     { "iommu_platform", QEMU_CAPS_VIRTIO_PCI_IOMMU_PLATFORM },
     { "ats", QEMU_CAPS_VIRTIO_PCI_ATS },
+    { "packed", QEMU_CAPS_VIRTIO_PACKED_QUEUES },
 };
 
 static struct virQEMUCapsStringFlags virQEMUCapsDevicePropsICH9[] = {

src/qemu/qemu_capabilities.h

@@ -552,6 +552,7 @@ typedef enum { /* virQEMUCapsFlags grouping marker for syntax-check */
 
     /* 360 */
     QEMU_CAPS_FSDEV_MULTIDEVS, /* fsdev.multidevs */
+    QEMU_CAPS_VIRTIO_PACKED_QUEUES, /* virtio.packed */
 
     QEMU_CAPS_LAST /* this must always be the last item */
 } virQEMUCapsFlags;

tests/qemucapabilitiesdata/caps_4.2.0.aarch64.xml

@@ -181,6 +181,7 @@
   <flag name='vhost-user-fs'/>
   <flag name='storage.werror'/>
   <flag name='fsdev.multidevs'/>
+  <flag name='virtio.packed'/>
   <version>4001050</version>
   <kvmVersion>0</kvmVersion>
   <microcodeVersion>61700242</microcodeVersion>

tests/qemucapabilitiesdata/caps_4.2.0.s390x.xml

@@ -146,6 +146,7 @@
   <flag name='vhost-user-fs'/>
   <flag name='storage.werror'/>
   <flag name='fsdev.multidevs'/>
+  <flag name='virtio.packed'/>
   <version>4002000</version>
   <kvmVersion>0</kvmVersion>
   <microcodeVersion>39100242</microcodeVersion>

tests/qemucapabilitiesdata/caps_4.2.0.x86_64.xml

@@ -225,6 +225,7 @@
   <flag name='vhost-user-fs'/>
   <flag name='storage.werror'/>
   <flag name='fsdev.multidevs'/>
+  <flag name='virtio.packed'/>
   <version>4002000</version>
   <kvmVersion>0</kvmVersion>
   <microcodeVersion>43100242</microcodeVersion>

tests/qemucapabilitiesdata/caps_5.0.0.aarch64.xml

@@ -183,6 +183,7 @@
   <flag name='vhost-user-fs'/>
   <flag name='storage.werror'/>
   <flag name='fsdev.multidevs'/>
+  <flag name='virtio.packed'/>
   <version>4002050</version>
   <kvmVersion>0</kvmVersion>
   <microcodeVersion>61700241</microcodeVersion>

tests/qemucapabilitiesdata/caps_5.0.0.ppc64.xml

@@ -191,6 +191,7 @@
   <flag name='blockdev-snapshot.allow-write-only-overlay'/>
   <flag name='storage.werror'/>
   <flag name='fsdev.multidevs'/>
+  <flag name='virtio.packed'/>
   <version>4002050</version>
   <kvmVersion>0</kvmVersion>
   <microcodeVersion>42900241</microcodeVersion>

tests/qemucapabilitiesdata/caps_5.0.0.x86_64.xml

@@ -228,6 +228,7 @@
   <flag name='blockdev-snapshot.allow-write-only-overlay'/>
   <flag name='storage.werror'/>
   <flag name='fsdev.multidevs'/>
+  <flag name='virtio.packed'/>
   <version>4002091</version>
   <kvmVersion>0</kvmVersion>
   <microcodeVersion>43100241</microcodeVersion>