[libvirt] [PATCH 5/8] conf: Add disk iothread bus check in device post parse

[John Ferlan]

Add a check in the device post processing for any disk using iothread to be
using the proper bus (which happens to be only virtio for now).

This check could have been added in device parse, except that if a domain
was running with such a configuration (albeit doing nothing), then it
would disappear. Found while working through code to add iothreads for
virtio-scsi-{pci,ccw}.

Signed-off-by: John Ferlan <jferlan at redhat.com>
---
 src/conf/domain_conf.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/src/conf/domain_conf.c b/src/conf/domain_conf.c
index a3c50f1..fd7579a 100644
--- a/src/conf/domain_conf.c
+++ b/src/conf/domain_conf.c
@@ -4187,6 +4187,13 @@ virDomainDeviceDefPostParseInternal(virDomainDeviceDefPtr dev,
             return -1;
         }
 
+        if (disk->iothread && disk->bus != VIR_DOMAIN_DISK_BUS_VIRTIO) {
+            virReportError(VIR_ERR_CONFIG_UNSUPPORTED,
+                           _("disk '%s' improperly configured, iothread "
+                             "only supported on virtio bus"), disk->dst);
+            return -1;
+        }
+
         if (disk->info.type == VIR_DOMAIN_DEVICE_ADDRESS_TYPE_NONE &&
             virDomainDiskDefAssignAddress(xmlopt, disk, def) < 0)
             return -1;
-- 
2.5.5