Check whether the disable-legacy property is present on the following
devices:
  virtio-balloon-pci
  virtio-blk-pci
  virtio-scsi-pci
  virtio-net-pci
  virtio-gpu-pci

Assuming that if QEMU knows other virtio devices where this property
is applicable, it will have at least one of these devices.

Added in QEMU by:
commit e266d421490e0ae83044bbebb209b2d3650c0ba6
    virtio-pci: add flags to enable/disable legacy/modern
---
 src/qemu/qemu_capabilities.c                            | 6 ++++++
 src/qemu/qemu_capabilities.h                            | 1 +
 tests/qemucapabilitiesdata/caps_2.4.0.x86_64.xml        | 1 +
 tests/qemucapabilitiesdata/caps_2.5.0.x86_64.xml        | 1 +
 tests/qemucapabilitiesdata/caps_2.6.0-gicv2.aarch64.xml | 1 +
 tests/qemucapabilitiesdata/caps_2.6.0-gicv3.aarch64.xml | 1 +
 tests/qemucapabilitiesdata/caps_2.6.0.ppc64le.xml       | 1 +
 tests/qemucapabilitiesdata/caps_2.6.0.x86_64.xml        | 1 +
 tests/qemucapabilitiesdata/caps_2.7.0.x86_64.xml        | 1 +
 9 files changed, 14 insertions(+)

diff --git a/src/qemu/qemu_capabilities.c b/src/qemu/qemu_capabilities.c
index 43e3ea7..340691a 100644
--- a/src/qemu/qemu_capabilities.c
+++ b/src/qemu/qemu_capabilities.c
@@ -340,6 +340,7 @@ VIR_ENUM_IMPL(virQEMUCaps, QEMU_CAPS_LAST,
               "display", /* 230 */
               "intel-iommu",
               "smm",
+              "virtio-revision",
     );
 
 
@@ -1565,6 +1566,7 @@ struct virQEMUCapsStringFlags virQEMUCapsObjectTypes[] = {
 
 static struct virQEMUCapsStringFlags virQEMUCapsObjectPropsVirtioBalloon[] = {
     { "deflate-on-oom", QEMU_CAPS_VIRTIO_BALLOON_AUTODEFLATE },
+    { "disable-legacy", QEMU_CAPS_DEVICE_VIRTIO_REVISION },
 };
 
 static struct virQEMUCapsStringFlags virQEMUCapsObjectPropsVirtioBlk[] = {
@@ -1574,15 +1576,18 @@ static struct virQEMUCapsStringFlags 
virQEMUCapsObjectPropsVirtioBlk[] = {
     { "event_idx", QEMU_CAPS_VIRTIO_BLK_EVENT_IDX },
     { "scsi", QEMU_CAPS_VIRTIO_BLK_SCSI },
     { "logical_block_size", QEMU_CAPS_BLOCKIO },
+    { "disable-legacy", QEMU_CAPS_DEVICE_VIRTIO_REVISION },
 };
 
 static struct virQEMUCapsStringFlags virQEMUCapsObjectPropsVirtioNet[] = {
     { "tx", QEMU_CAPS_VIRTIO_TX_ALG },
     { "event_idx", QEMU_CAPS_VIRTIO_NET_EVENT_IDX },
+    { "disable-legacy", QEMU_CAPS_DEVICE_VIRTIO_REVISION },
 };
 
 static struct virQEMUCapsStringFlags virQEMUCapsObjectPropsVirtioSCSI[] = {
     { "iothread", QEMU_CAPS_VIRTIO_SCSI_IOTHREAD },
+    { "disable-legacy", QEMU_CAPS_DEVICE_VIRTIO_REVISION },
 };
 
 static struct virQEMUCapsStringFlags virQEMUCapsObjectPropsPCIAssign[] = {
@@ -1659,6 +1664,7 @@ static struct virQEMUCapsStringFlags 
virQEMUCapsObjectPropsQxlVga[] = {
 
 static struct virQEMUCapsStringFlags virQEMUCapsObjectPropsVirtioGpu[] = {
     { "virgl", QEMU_CAPS_DEVICE_VIRTIO_GPU_VIRGL },
+    { "disable-legacy", QEMU_CAPS_DEVICE_VIRTIO_REVISION },
 };
 
 static struct virQEMUCapsStringFlags virQEMUCapsObjectPropsICH9[] = {
diff --git a/src/qemu/qemu_capabilities.h b/src/qemu/qemu_capabilities.h
index d249e2e..15cf19d 100644
--- a/src/qemu/qemu_capabilities.h
+++ b/src/qemu/qemu_capabilities.h
@@ -373,6 +373,7 @@ typedef enum {
     QEMU_CAPS_DISPLAY, /* -display */
     QEMU_CAPS_DEVICE_INTEL_IOMMU, /* -device intel-iommu */
     QEMU_CAPS_MACHINE_SMM_OPT, /* -machine xxx,smm=on/off/auto */
+    QEMU_CAPS_DEVICE_VIRTIO_REVISION, /* virtio-*pci.disable-{legacy,modern} */
 
     QEMU_CAPS_LAST /* this must always be the last item */
 } virQEMUCapsFlags;
diff --git a/tests/qemucapabilitiesdata/caps_2.4.0.x86_64.xml 
b/tests/qemucapabilitiesdata/caps_2.4.0.x86_64.xml
index 339ee1f..5ec9320 100644
--- a/tests/qemucapabilitiesdata/caps_2.4.0.x86_64.xml
+++ b/tests/qemucapabilitiesdata/caps_2.4.0.x86_64.xml
@@ -184,6 +184,7 @@
   <flag name='display'/>
   <flag name='intel-iommu'/>
   <flag name='smm'/>
+  <flag name='virtio-revision'/>
   <version>2004000</version>
   <kvmVersion>0</kvmVersion>
   <package></package>
diff --git a/tests/qemucapabilitiesdata/caps_2.5.0.x86_64.xml 
b/tests/qemucapabilitiesdata/caps_2.5.0.x86_64.xml
index c1a68d0..33c89ae 100644
--- a/tests/qemucapabilitiesdata/caps_2.5.0.x86_64.xml
+++ b/tests/qemucapabilitiesdata/caps_2.5.0.x86_64.xml
@@ -189,6 +189,7 @@
   <flag name='display'/>
   <flag name='intel-iommu'/>
   <flag name='smm'/>
+  <flag name='virtio-revision'/>
   <version>2005000</version>
   <kvmVersion>0</kvmVersion>
   <package></package>
diff --git a/tests/qemucapabilitiesdata/caps_2.6.0-gicv2.aarch64.xml 
b/tests/qemucapabilitiesdata/caps_2.6.0-gicv2.aarch64.xml
index 85d7d3f..2eefaa0 100644
--- a/tests/qemucapabilitiesdata/caps_2.6.0-gicv2.aarch64.xml
+++ b/tests/qemucapabilitiesdata/caps_2.6.0-gicv2.aarch64.xml
@@ -158,6 +158,7 @@
   <flag name='tls-creds-x509'/>
   <flag name='display'/>
   <flag name='smm'/>
+  <flag name='virtio-revision'/>
   <version>2005094</version>
   <kvmVersion>0</kvmVersion>
   <package></package>
diff --git a/tests/qemucapabilitiesdata/caps_2.6.0-gicv3.aarch64.xml 
b/tests/qemucapabilitiesdata/caps_2.6.0-gicv3.aarch64.xml
index deb1257..581ffaa 100644
--- a/tests/qemucapabilitiesdata/caps_2.6.0-gicv3.aarch64.xml
+++ b/tests/qemucapabilitiesdata/caps_2.6.0-gicv3.aarch64.xml
@@ -158,6 +158,7 @@
   <flag name='tls-creds-x509'/>
   <flag name='display'/>
   <flag name='smm'/>
+  <flag name='virtio-revision'/>
   <version>2005094</version>
   <kvmVersion>0</kvmVersion>
   <package></package>
diff --git a/tests/qemucapabilitiesdata/caps_2.6.0.ppc64le.xml 
b/tests/qemucapabilitiesdata/caps_2.6.0.ppc64le.xml
index 2b7ea0e..8ed2c49 100644
--- a/tests/qemucapabilitiesdata/caps_2.6.0.ppc64le.xml
+++ b/tests/qemucapabilitiesdata/caps_2.6.0.ppc64le.xml
@@ -152,6 +152,7 @@
   <flag name='tls-creds-x509'/>
   <flag name='display'/>
   <flag name='smm'/>
+  <flag name='virtio-revision'/>
   <version>2005094</version>
   <kvmVersion>0</kvmVersion>
   <package></package>
diff --git a/tests/qemucapabilitiesdata/caps_2.6.0.x86_64.xml 
b/tests/qemucapabilitiesdata/caps_2.6.0.x86_64.xml
index 495c114..bf35867 100644
--- a/tests/qemucapabilitiesdata/caps_2.6.0.x86_64.xml
+++ b/tests/qemucapabilitiesdata/caps_2.6.0.x86_64.xml
@@ -195,6 +195,7 @@
   <flag name='display'/>
   <flag name='intel-iommu'/>
   <flag name='smm'/>
+  <flag name='virtio-revision'/>
   <version>2006000</version>
   <kvmVersion>0</kvmVersion>
   <package></package>
diff --git a/tests/qemucapabilitiesdata/caps_2.7.0.x86_64.xml 
b/tests/qemucapabilitiesdata/caps_2.7.0.x86_64.xml
index fafffa6..de2f3ee 100644
--- a/tests/qemucapabilitiesdata/caps_2.7.0.x86_64.xml
+++ b/tests/qemucapabilitiesdata/caps_2.7.0.x86_64.xml
@@ -192,6 +192,7 @@
   <flag name='display'/>
   <flag name='intel-iommu'/>
   <flag name='smm'/>
+  <flag name='virtio-revision'/>
   <version>2006091</version>
   <kvmVersion>0</kvmVersion>
   <package> (v2.7.0-rc1-52-g42e0d60)</package>
-- 
2.7.3

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