[libvirt] [REPOST PATCHv2 1/2] qemu: Check for existing hostdev address for cold attach device

Prior to the hostdev being inserted in the hostdevs list, add a check during qemuDomainAttachDeviceConfig to determine whether the new/incoming <hostdev ...> device is providing the same <address> as some existing hostdev on the list and if so fail the cold attach. This cannot be done during virDomainHostdevDefPostParse because that is called after virDomainDefParseXML would have inserted a hostdev onto the hostdevs list and thus would have a "conflict" with itself. Therefore, the post parse processing can only compare if the current hostdev address conflicts with a SCSI <disk> address. By comparison this is similar to the validation phase checks in virDomainDefCheckDuplicateDriveAddresses that occur during define/startup processing but are not run during config attach of a live guest. Signed-off-by: John Ferlan <jferlan(a)redhat.com&gt; --- 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 9a35e04a85..ef1abe3f68 100644 --- a/src/qemu/qemu_driver.c +++ b/src/qemu/qemu_driver.c @@ -8007,6 +8007,12 @@ 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