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Add support for network device detach

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qemu network devices are hot-unplugged in two stages - first the PCI NIC
is removed using 'pci_del <pci_addr>' and then the backend is removed
using 'host_net_remove <vlan> <name>'.

In order to perform these operations we need to have retained the
PCI address, backend name and vlan number.

* src/qemu_driver.c: add qemudDomainDetachNetDevice()
This commit is contained in:
Mark McLoughlin 2009-07-17 22:08:34 +01:00
parent 4e21a95afe
commit c2709cdaaa
1 changed files with 100 additions and 2 deletions
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102
src/qemu_driver.c
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@ -4907,6 +4907,103 @@ cleanup:
return ret;
}
static int
qemudDomainDetachNetDevice(virConnectPtr conn,
virDomainObjPtr vm,
virDomainDeviceDefPtr dev)
{
int i, ret = -1;
char *cmd = NULL;
char *reply = NULL;
virDomainNetDefPtr detach = NULL;
for (i = 0 ; i < vm->def->nnets ; i++) {
virDomainNetDefPtr net = vm->def->nets[i];
if (!memcmp(net->mac, dev->data.net->mac, sizeof(net->mac))) {
detach = net;
break;
}
}
if (!detach) {
qemudReportError(conn, NULL, NULL, VIR_ERR_OPERATION_FAILED,
_("network device %02x:%02x:%02x:%02x:%02x:%02x not found"),
dev->data.net->mac[0], dev->data.net->mac[1],
dev->data.net->mac[2], dev->data.net->mac[3],
dev->data.net->mac[4], dev->data.net->mac[5]);
goto cleanup;
}
if (!virNetHasValidPciAddr(detach) || detach->vlan < 0 || !detach->hostnet_name) {
qemudReportError(conn, NULL, NULL, VIR_ERR_OPERATION_FAILED,
"%s", _("network device cannot be detached - device state missing"));
goto cleanup;
}
if (virAsprintf(&cmd, "pci_del pci_addr=%.4x:%.2x:%.2x",
detach->pci_addr.domain,
detach->pci_addr.bus,
detach->pci_addr.slot) < 0) {
virReportOOMError(conn);
goto cleanup;
}
if (qemudMonitorCommand(vm, cmd, &reply) < 0) {
qemudReportError(conn, NULL, NULL, VIR_ERR_OPERATION_FAILED,
_("network device dettach command '%s' failed"), cmd);
goto cleanup;
}
DEBUG("%s: pci_del reply: %s", vm->def->name, reply);
/* If the command fails due to a wrong PCI address qemu prints
* 'invalid pci address'; nothing is printed on success */
if (strstr(reply, "Invalid pci address")) {
qemudReportError(conn, NULL, NULL, VIR_ERR_OPERATION_FAILED,
_("failed to detach network device: invalid PCI address %.4x:%.2x:%.2x: %s"),
detach->pci_addr.domain,
detach->pci_addr.bus,
detach->pci_addr.slot,
reply);
goto cleanup;
}
VIR_FREE(reply);
VIR_FREE(cmd);
if (virAsprintf(&cmd, "host_net_remove %d %s",
detach->vlan, detach->hostnet_name) < 0) {
virReportOOMError(conn);
goto cleanup;
}
if (qemudMonitorCommand(vm, cmd, &reply) < 0) {
qemudReportError(conn, NULL, NULL, VIR_ERR_OPERATION_FAILED,
_("network device dettach command '%s' failed"), cmd);
goto cleanup;
}
DEBUG("%s: host_net_remove reply: %s", vm->def->name, reply);
if (vm->def->nnets > 1) {
vm->def->nets[i] = vm->def->nets[--vm->def->nnets];
if (VIR_REALLOC_N(vm->def->nets, vm->def->nnets) < 0) {
virReportOOMError(conn);
goto cleanup;
}
} else {
VIR_FREE(vm->def->nets[0]);
vm->def->nnets = 0;
}
ret = 0;
cleanup:
VIR_FREE(reply);
VIR_FREE(cmd);
return ret;
}
static int qemudDomainDetachDevice(virDomainPtr dom,
const char *xml) {
struct qemud_driver *driver = dom->conn->privateData;
@ -4945,8 +5042,9 @@ static int qemudDomainDetachDevice(virDomainPtr dom,
driver->securityDriver->domainRestoreSecurityImageLabel(dom->conn, dev->data.disk);
if (qemuDomainSetDeviceOwnership(dom->conn, driver, dev, 1) < 0)
VIR_WARN0("Fail to restore disk device ownership");
}
else
} else if (dev->type == VIR_DOMAIN_DEVICE_NET) {
ret = qemudDomainDetachNetDevice(dom->conn, vm, dev);
} else
qemudReportError(dom->conn, dom, NULL, VIR_ERR_NO_SUPPORT,
"%s", _("only SCSI or virtio disk device can be detached dynamically"));