[libvirt] [PATCH] qemu: Check for existing hostdev address for cold attach device

[John Ferlan]

https://bugzilla.redhat.com/show_bug.cgi?id=1559867

Add a check if the incoming <hostdev ...> with specified <address>
already exists and if so fail the attach.

Signed-off-by: John Ferlan <jferlan at redhat.com>
---
 src/qemu/qemu_driver.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/src/qemu/qemu_driver.c b/src/qemu/qemu_driver.c
index 38ea865ce3..7b4cdbcdcf 100644
--- a/src/qemu/qemu_driver.c
+++ b/src/qemu/qemu_driver.c
@@ -8014,6 +8014,12 @@ qemuDomainAttachDeviceConfig(virDomainDefPtr vmdef,
                            _("device is already in the domain configuration"));
             return -1;
         }
+        if (dev->data.hostdev->info->type != VIR_DOMAIN_DEVICE_ADDRESS_TYPE_NONE &&
+            virDomainDefHasDeviceAddress(vmdef, dev->data.hostdev->info)) {
+            virReportError(VIR_ERR_CONFIG_UNSUPPORTED, "%s",
+                           _("a device with the same address already exists "));
+            return -1;
+        }
         if (virDomainHostdevInsert(vmdef, hostdev))
             return -1;
         dev->data.hostdev = NULL;
-- 
2.14.4