[PATCH v2 2/4] qemu: capabilities: add QEMU_CAPS_VIRTFS_MULTIDEVS

[Christian Schoenebeck <qemu_oss@xxxxxxxxxxxxx>]

The QEMU 9pfs 'multidevs' option exists since QEMU 4.2, so just
set this capability based on that QEMU version.

Signed-off-by: Christian Schoenebeck <qemu_oss@xxxxxxxxxxxxx>
---
 src/qemu/qemu_capabilities.c                      | 5 +++++
 src/qemu/qemu_capabilities.h                      | 1 +
 tests/qemucapabilitiesdata/caps_4.2.0.x86_64.xml  | 1 +
 tests/qemucapabilitiesdata/caps_5.0.0.aarch64.xml | 1 +
 tests/qemucapabilitiesdata/caps_5.0.0.x86_64.xml  | 1 +
 5 files changed, 9 insertions(+)

diff --git a/src/qemu/qemu_capabilities.c b/src/qemu/qemu_capabilities.c
index a95a60c36a..68b6e166e9 100644
--- a/src/qemu/qemu_capabilities.c
+++ b/src/qemu/qemu_capabilities.c
@@ -567,6 +567,7 @@ VIR_ENUM_IMPL(virQEMUCaps,
               "query-named-block-nodes.flat",
               "blockdev-snapshot.allow-write-only-overlay",
               "blockdev-reopen",
+              "virtfs-multidevs",
     );
 
 
@@ -4837,6 +4838,10 @@ virQEMUCapsInitQMPVersionCaps(virQEMUCapsPtr qemuCaps)
         ARCH_IS_PPC64(qemuCaps->arch)) {
         virQEMUCapsSet(qemuCaps, QEMU_CAPS_MACHINE_PSERIES_MAX_CPU_COMPAT);
     }
+
+    /* -virtfs multidevs option is supported since QEMU 4.2 */
+    if (qemuCaps->version >= 4002000)
+        virQEMUCapsSet(qemuCaps, QEMU_CAPS_VIRTFS_MULTIDEVS);
 }
 
 
diff --git a/src/qemu/qemu_capabilities.h b/src/qemu/qemu_capabilities.h
index f0961e273c..a6025312be 100644
--- a/src/qemu/qemu_capabilities.h
+++ b/src/qemu/qemu_capabilities.h
@@ -548,6 +548,7 @@ typedef enum { /* virQEMUCapsFlags grouping marker for syntax-check */
     QEMU_CAPS_QMP_QUERY_NAMED_BLOCK_NODES_FLAT, /* query-named-block-nodes supports the 'flat' option */
     QEMU_CAPS_BLOCKDEV_SNAPSHOT_ALLOW_WRITE_ONLY, /* blockdev-snapshot has the 'allow-write-only-overlay' feature */
     QEMU_CAPS_BLOCKDEV_REOPEN, /* 'blockdev-reopen' qmp command is supported */
+    QEMU_CAPS_VIRTFS_MULTIDEVS, /* -virtfs multidevs supported by virtio-9p */
 
     QEMU_CAPS_LAST /* this must always be the last item */
 } virQEMUCapsFlags;
diff --git a/tests/qemucapabilitiesdata/caps_4.2.0.x86_64.xml b/tests/qemucapabilitiesdata/caps_4.2.0.x86_64.xml
index 83e804ea36..d8b0de46cd 100644
--- a/tests/qemucapabilitiesdata/caps_4.2.0.x86_64.xml
+++ b/tests/qemucapabilitiesdata/caps_4.2.0.x86_64.xml
@@ -223,6 +223,7 @@
   <flag name='rng-builtin'/>
   <flag name='virtio-net.failover'/>
   <flag name='vhost-user-fs'/>
+  <flag name='virtfs-multidevs'/>
   <version>4002000</version>
   <kvmVersion>0</kvmVersion>
   <microcodeVersion>43100242</microcodeVersion>
diff --git a/tests/qemucapabilitiesdata/caps_5.0.0.aarch64.xml b/tests/qemucapabilitiesdata/caps_5.0.0.aarch64.xml
index e52c60607d..3a695fbe79 100644
--- a/tests/qemucapabilitiesdata/caps_5.0.0.aarch64.xml
+++ b/tests/qemucapabilitiesdata/caps_5.0.0.aarch64.xml
@@ -181,6 +181,7 @@
   <flag name='virtio-net.failover'/>
   <flag name='cpu.kvm-no-adjvtime'/>
   <flag name='vhost-user-fs'/>
+  <flag name='virtfs-multidevs'/>
   <version>4002050</version>
   <kvmVersion>0</kvmVersion>
   <microcodeVersion>61700241</microcodeVersion>
diff --git a/tests/qemucapabilitiesdata/caps_5.0.0.x86_64.xml b/tests/qemucapabilitiesdata/caps_5.0.0.x86_64.xml
index d773f7e356..95fa0813dd 100644
--- a/tests/qemucapabilitiesdata/caps_5.0.0.x86_64.xml
+++ b/tests/qemucapabilitiesdata/caps_5.0.0.x86_64.xml
@@ -226,6 +226,7 @@
   <flag name='vhost-user-fs'/>
   <flag name='query-named-block-nodes.flat'/>
   <flag name='blockdev-snapshot.allow-write-only-overlay'/>
+  <flag name='virtfs-multidevs'/>
   <version>4002050</version>
   <kvmVersion>0</kvmVersion>
   <microcodeVersion>43100241</microcodeVersion>
-- 
2.20.1