[libvirt] [PATCH 10/34] Implement SCSI controller hotplug/unplug for QEMU
Daniel Veillard
veillard at redhat.com
Fri Jan 15 14:50:48 UTC 2010
On Fri, Jan 08, 2010 at 05:23:06PM +0000, Daniel P. Berrange wrote:
> From: Wolfgang Mauerer <wolfgang.mauerer at siemens.com>
>
> This patch allows for explicit hotplug/unplug of SCSI controllers.
> Ordinarily this is not required, since QEMU/libvirt will attach
> a new SCSI controller whenever one is required. Allowing explicit
> hotplug of controllers though, enables the caller to specify a
> static PCI address, instead of auto-assigning the next available
> PCI slot. Or it will when we have static PCI addressing.
>
> This patch is derived from Wolfgang Mauerer's disk controller
> patch series.
>
> * src/qemu/qemu_driver.c: Support hotplug & unplug of SCSI
> controllers
> * src/qemu/qemu_monitor.c, src/qemu/qemu_monitor.h,
> src/qemu/qemu_monitor_json.c, src/qemu/qemu_monitor_json.h,
> src/qemu/qemu_monitor_text.c, src/qemu/qemu_monitor_text.h: Add
> new API for attaching PCI SCSI controllers
> ---
> src/libvirt_private.syms | 2 +
> src/qemu/qemu_driver.c | 118 ++++++++++++++++++++++++++++++++++++++++++
> src/qemu/qemu_monitor.c | 16 ++++++
> src/qemu/qemu_monitor.h | 4 ++
> src/qemu/qemu_monitor_json.c | 40 ++++++++++++++
> src/qemu/qemu_monitor_json.h | 4 ++
> src/qemu/qemu_monitor_text.c | 45 ++++++++++++++++
> src/qemu/qemu_monitor_text.h | 5 ++
> 8 files changed, 234 insertions(+), 0 deletions(-)
>
> diff --git a/src/libvirt_private.syms b/src/libvirt_private.syms
> index a346aa5..fa8825f 100644
> --- a/src/libvirt_private.syms
> +++ b/src/libvirt_private.syms
> @@ -183,6 +183,8 @@ virDomainDeviceAddressIsValid;
> virDomainDevicePCIAddressIsValid;
> virDomainDeviceInfoIsSet;
> virDomainDeviceAddressClear;
> +virDomainControllerTypeToString;
> +virDomainControllerDefFree;
>
>
> # domain_event.h
> diff --git a/src/qemu/qemu_driver.c b/src/qemu/qemu_driver.c
> index 8c2e6d6..9dcbe25 100644
> --- a/src/qemu/qemu_driver.c
> +++ b/src/qemu/qemu_driver.c
> @@ -5111,6 +5111,45 @@ static int qemudDomainAttachPciDiskDevice(virConnectPtr conn,
> return ret;
> }
>
> +static int qemudDomainAttachPciControllerDevice(virConnectPtr conn,
> + struct qemud_driver *driver,
> + virDomainObjPtr vm,
> + virDomainControllerDefPtr def)
> +{
> + int i, ret;
> + const char* type = virDomainControllerTypeToString(def->type);
> + qemuDomainObjPrivatePtr priv = vm->privateData;
> +
> + for (i = 0 ; i < vm->def->ncontrollers ; i++) {
> + if ((vm->def->controllers[i]->type == def->type) &&
> + (vm->def->controllers[i]->idx == def->idx)) {
> + qemudReportError(conn, dom, NULL, VIR_ERR_OPERATION_FAILED,
> + _("target %s:%d already exists"),
> + type, def->idx);
> + return -1;
> + }
> + }
> +
> + if (VIR_REALLOC_N(vm->def->controllers, vm->def->ncontrollers+1) < 0) {
> + virReportOOMError(conn);
> + return -1;
> + }
> +
> + qemuDomainObjEnterMonitorWithDriver(driver, vm);
> + ret = qemuMonitorAttachPCIDiskController(priv->mon,
> + type,
> + &def->info.addr.pci);
> + qemuDomainObjExitMonitorWithDriver(driver, vm);
> +
> + if (ret == 0) {
> + def->info.type = VIR_DOMAIN_DEVICE_ADDRESS_TYPE_PCI;
> + virDomainControllerInsertPreAlloced(vm->def, def);
> + }
> +
> + return ret;
> +}
> +
> +
> static int qemudDomainAttachUsbMassstorageDevice(virConnectPtr conn,
> struct qemud_driver *driver,
> virDomainObjPtr vm,
> @@ -5496,6 +5535,15 @@ static int qemudDomainAttachDevice(virDomainPtr dom,
> virCgroupDenyDevicePath(cgroup,
> dev->data.disk->src);
> }
> + } else if (dev->type == VIR_DOMAIN_DEVICE_CONTROLLER) {
> + if (dev->data.controller->type == VIR_DOMAIN_CONTROLLER_TYPE_SCSI) {
> + ret = qemudDomainAttachPciControllerDevice(dom->conn, driver, vm, dev->data.controller);
> + } else {
> + qemudReportError(dom->conn, dom, NULL, VIR_ERR_NO_SUPPORT,
> + _("disk controller bus '%s' cannot be hotplugged."),
> + virDomainControllerTypeToString(dev->data.controller->type));
> + /* fallthrough */
> + }
> } else if (dev->type == VIR_DOMAIN_DEVICE_NET) {
> ret = qemudDomainAttachNetDevice(dom->conn, driver, vm, dev, qemuCmdFlags);
> } else if (dev->type == VIR_DOMAIN_DEVICE_HOSTDEV) {
> @@ -5587,6 +5635,67 @@ cleanup:
> return ret;
> }
>
> +static int qemudDomainDetachPciControllerDevice(virConnectPtr conn,
> + struct qemud_driver *driver,
> + virDomainObjPtr vm,
> + virDomainDeviceDefPtr dev)
> +{
> + int i, ret = -1;
> + virDomainControllerDefPtr detach = NULL;
> + qemuDomainObjPrivatePtr priv = vm->privateData;
> +
> + for (i = 0 ; i < vm->def->ncontrollers ; i++) {
> + if ((vm->def->controllers[i]->type == dev->data.controller->type) &&
> + (vm->def->controllers[i]->idx == dev->data.controller->idx)) {
> + detach = vm->def->controllers[i];
> + break;
> + }
> + }
> +
> + if (!detach) {
> + qemudReportError(conn, NULL, NULL, VIR_ERR_OPERATION_FAILED,
> + _("disk controller %s:%d not found"),
> + virDomainControllerTypeToString(dev->data.controller->type),
> + dev->data.controller->idx);
> + goto cleanup;
> + }
> +
> + if (!virDomainDeviceAddressIsValid(&detach->info,
> + VIR_DOMAIN_DEVICE_ADDRESS_TYPE_PCI)) {
> + qemudReportError(conn, NULL, NULL, VIR_ERR_OPERATION_FAILED, "%s",
> + _("device cannot be detached without a PCI address"));
> + goto cleanup;
> + }
> +
> + qemuDomainObjEnterMonitorWithDriver(driver, vm);
> + if (qemuMonitorRemovePCIDevice(priv->mon,
> + &detach->info.addr.pci) < 0) {
> + qemuDomainObjExitMonitor(vm);
> + goto cleanup;
> + }
> + qemuDomainObjExitMonitorWithDriver(driver, vm);
> +
> + if (vm->def->ncontrollers > 1) {
> + memmove(vm->def->controllers + i,
> + vm->def->controllers + i + 1,
> + sizeof(*vm->def->controllers) *
> + (vm->def->ncontrollers - (i + 1)));
> + vm->def->ncontrollers--;
> + if (VIR_REALLOC_N(vm->def->controllers, vm->def->ncontrollers) < 0) {
> + /* ignore, harmless */
> + }
> + } else {
> + VIR_FREE(vm->def->controllers);
> + vm->def->ncontrollers = 0;
> + }
> + virDomainControllerDefFree(detach);
> +
> + ret = 0;
> +
> +cleanup:
> + return ret;
> +}
> +
> static int
> qemudDomainDetachNetDevice(virConnectPtr conn,
> struct qemud_driver *driver,
> @@ -5838,6 +5947,15 @@ static int qemudDomainDetachDevice(virDomainPtr dom,
> VIR_WARN0("Fail to restore disk device ownership");
> } else if (dev->type == VIR_DOMAIN_DEVICE_NET) {
> ret = qemudDomainDetachNetDevice(dom->conn, driver, vm, dev);
> + } else if (dev->type == VIR_DOMAIN_DEVICE_CONTROLLER) {
> + if (dev->data.controller->type == VIR_DOMAIN_CONTROLLER_TYPE_SCSI) {
> + ret = qemudDomainDetachPciControllerDevice(dom->conn, driver, vm, dev);
> + } else {
> + qemudReportError(dom->conn, dom, NULL, VIR_ERR_NO_SUPPORT,
> + _("disk controller bus '%s' cannot be hotunplugged."),
> + virDomainControllerTypeToString(dev->data.controller->type));
> + /* fallthrough */
> + }
> } else if (dev->type == VIR_DOMAIN_DEVICE_HOSTDEV) {
> ret = qemudDomainDetachHostDevice(dom->conn, driver, vm, dev);
> } else
> diff --git a/src/qemu/qemu_monitor.c b/src/qemu/qemu_monitor.c
> index caf2d35..dca8906 100644
> --- a/src/qemu/qemu_monitor.c
> +++ b/src/qemu/qemu_monitor.c
> @@ -1250,3 +1250,19 @@ int qemuMonitorGetPtyPaths(qemuMonitorPtr mon,
>
> return qemuMonitorTextGetPtyPaths(mon, paths);
> }
> +
> +
> +int qemuMonitorAttachPCIDiskController(qemuMonitorPtr mon,
> + const char *bus,
> + virDomainDevicePCIAddress *guestAddr)
> +{
> + DEBUG("mon=%p, fd=%d type=%s", mon, mon->fd, bus);
> + int ret;
> +
> + if (mon->json)
> + ret = qemuMonitorJSONAttachPCIDiskController(mon, bus, guestAddr);
> + else
> + ret = qemuMonitorTextAttachPCIDiskController(mon, bus, guestAddr);
> +
> + return ret;
> +}
> diff --git a/src/qemu/qemu_monitor.h b/src/qemu/qemu_monitor.h
> index e0a0552..1096106 100644
> --- a/src/qemu/qemu_monitor.h
> +++ b/src/qemu/qemu_monitor.h
> @@ -265,4 +265,8 @@ int qemuMonitorRemoveHostNetwork(qemuMonitorPtr mon,
> int qemuMonitorGetPtyPaths(qemuMonitorPtr mon,
> virHashTablePtr paths);
>
> +int qemuMonitorAttachPCIDiskController(qemuMonitorPtr mon,
> + const char *bus,
> + virDomainDevicePCIAddress *guestAddr);
> +
> #endif /* QEMU_MONITOR_H */
> diff --git a/src/qemu/qemu_monitor_json.c b/src/qemu/qemu_monitor_json.c
> index e0a3225..14b8680 100644
> --- a/src/qemu/qemu_monitor_json.c
> +++ b/src/qemu/qemu_monitor_json.c
> @@ -1482,3 +1482,43 @@ int qemuMonitorJSONRemoveHostNetwork(qemuMonitorPtr mon,
> virJSONValueFree(reply);
> return ret;
> }
> +
> +
> +int qemuMonitorJSONAttachPCIDiskController(qemuMonitorPtr mon,
> + const char *bus,
> + virDomainDevicePCIAddress *guestAddr)
> +{
> + int ret;
> + virJSONValuePtr cmd;
> + virJSONValuePtr reply = NULL;
> + char *dev;
> +
> + memset(guestAddr, 0, sizeof(*guestAddr));
> +
> + if (virAsprintf(&dev, "if=%s", bus) < 0) {
> + virReportOOMError(NULL);
> + return -1;
> + }
> +
> + cmd = qemuMonitorJSONMakeCommand("pci_add",
> + "s:pci_addr", "auto",
> + "s:type", "storage",
> + "s:opts", dev,
> + NULL);
> + VIR_FREE(dev);
> + if (!cmd)
> + return -1;
> +
> + ret = qemuMonitorJSONCommand(mon, cmd, &reply);
> +
> + if (ret == 0)
> + ret = qemuMonitorJSONCheckError(cmd, reply);
> +
> + if (ret == 0 &&
> + qemuMonitorJSONGetGuestAddress(reply, guestAddr) < 0)
> + ret = -1;
> +
> + virJSONValueFree(cmd);
> + virJSONValueFree(reply);
> + return ret;
> +}
> diff --git a/src/qemu/qemu_monitor_json.h b/src/qemu/qemu_monitor_json.h
> index 74d88b2..96eb68d 100644
> --- a/src/qemu/qemu_monitor_json.h
> +++ b/src/qemu/qemu_monitor_json.h
> @@ -141,4 +141,8 @@ int qemuMonitorJSONRemoveHostNetwork(qemuMonitorPtr mon,
> int vlan,
> const char *netname);
>
> +int qemuMonitorJSONAttachPCIDiskController(qemuMonitorPtr mon,
> + const char *bus,
> + virDomainDevicePCIAddress *guestAddr);
> +
> #endif /* QEMU_MONITOR_JSON_H */
> diff --git a/src/qemu/qemu_monitor_text.c b/src/qemu/qemu_monitor_text.c
> index 7c8b0a2..db3912e 100644
> --- a/src/qemu/qemu_monitor_text.c
> +++ b/src/qemu/qemu_monitor_text.c
> @@ -1747,6 +1747,51 @@ int qemuMonitorTextGetPtyPaths(qemuMonitorPtr mon,
> ret = 0;
>
> cleanup:
> + VIR_FREE(cmd);
> + VIR_FREE(reply);
> + return ret;
> +}
> +
> +
> +int qemuMonitorTextAttachPCIDiskController(qemuMonitorPtr mon,
> + const char *bus,
> + virDomainDevicePCIAddress *guestAddr)
> +{
> + char *cmd = NULL;
> + char *reply = NULL;
> + int tryOldSyntax = 0;
> + int ret = -1;
> +
> +try_command:
> + if (virAsprintf(&cmd, "pci_add %s storage if=%s",
> + (tryOldSyntax ? "0": "pci_addr=auto"), bus) < 0) {
> + virReportOOMError(NULL);
> + goto cleanup;
> + }
> +
> + if (qemuMonitorCommand(mon, cmd, &reply) < 0) {
> + qemudReportError(NULL, NULL, NULL, VIR_ERR_OPERATION_FAILED,
> + _("cannot attach %s disk controller"), bus);
> + goto cleanup;
> + }
> +
> + if (qemuMonitorTextParsePciAddReply(mon, reply, guestAddr) < 0) {
> + if (!tryOldSyntax && strstr(reply, "invalid char in expression")) {
> + VIR_FREE(reply);
> + VIR_FREE(cmd);
> + tryOldSyntax = 1;
> + goto try_command;
> + }
> +
> + qemudReportError (NULL, NULL, NULL, VIR_ERR_OPERATION_FAILED,
> + _("adding %s disk controller failed: %s"), bus, reply);
> + goto cleanup;
> + }
> +
> + ret = 0;
> +
> +cleanup:
> + VIR_FREE(cmd);
> VIR_FREE(reply);
> return ret;
> }
> diff --git a/src/qemu/qemu_monitor_text.h b/src/qemu/qemu_monitor_text.h
> index f1f2f77..ca2538a 100644
> --- a/src/qemu/qemu_monitor_text.h
> +++ b/src/qemu/qemu_monitor_text.h
> @@ -148,4 +148,9 @@ int qemuMonitorTextRemoveHostNetwork(qemuMonitorPtr mon,
> int qemuMonitorTextGetPtyPaths(qemuMonitorPtr mon,
> virHashTablePtr paths);
>
> +int qemuMonitorTextAttachPCIDiskController(qemuMonitorPtr mon,
> + const char *bus,
> + virDomainDevicePCIAddress *guestAddr);
> +
> +
> #endif /* QEMU_MONITOR_TEXT_H */
ACK,
Daniel
--
Daniel Veillard | libxml Gnome XML XSLT toolkit http://xmlsoft.org/
daniel at veillard.com | Rpmfind RPM search engine http://rpmfind.net/
http://veillard.com/ | virtualization library http://libvirt.org/
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