[libvirt] [PATCH 3/5] libvirt/qemu - support persistent modification of devices.

From: KAMEZAWA Hiroyuki <kamezawa.hiroyu(a)jp.fujitsu.com&gt; Date: Thu, 3 Mar 2011 09:43:07 +0900 Subject: [PATCH 3/5] libivrt/qemu - support persistent modification of devices. Now, virsh attach-***/detach-*** has --persistent option and it can update XML definition of inactive domains. Now, disk and nic are supported in Xen, but none in qemu. This patch adds a function for permanent modification for qemu. Following patches will add disk/network suport. TODO: - finally, need to do hotplug + XML modification for active domain. Changelog v3->v4 - fixed trailing white spaces. - splitted into 2 part and this patch only contains wrappers. Changelog v2->v3: - clean ups. - handle all VIR_DOMAIN_DEVICE_MODIFY_XXX flags. --- src/qemu/qemu_driver.c | 143 ++++++++++++++++++++++++++++++++++++++++++++---- 1 files changed, 131 insertions(+), 12 deletions(-) diff --git a/src/qemu/qemu_driver.c b/src/qemu/qemu_driver.c index c9095bb..3248cdc 100644 --- a/src/qemu/qemu_driver.c +++ b/src/qemu/qemu_driver.c @@ -4099,16 +4099,131 @@ cleanup: return ret; } -static int qemudDomainAttachDeviceFlags(virDomainPtr dom, +/* + * Attach a device given by XML, the change will be persistent + * and domain XML definition file is updated. + */ +static int qemuDomainAttachDevicePersistent(virDomainDefPtr vmdef, + virDomainDeviceDefPtr newdev) +{ + + /* At first, check device confliction */ + switch(newdev->type) { + default: + qemuReportError(VIR_ERR_INVALID_ARG, "%s", + _("Sorry, the device is not suppored for now")); + return -1; + } + + return 0; +} + +static int qemuDomainDetachDevicePersistent(virDomainDefPtr vmdef, + virDomainDeviceDefPtr device) +{ + switch(device->type) { + default: + qemuReportError(VIR_ERR_INVALID_ARG, "%s", + _("Sorry, the device is not suppored for now")); + return -1; + } + return 0; +} + +static int qemuDomainModifyDevicePersistent(virDomainPtr dom, const char *xml, - unsigned int flags) { - if (flags & VIR_DOMAIN_DEVICE_MODIFY_CONFIG) { - qemuReportError(VIR_ERR_OPERATION_INVALID, - "%s", _("cannot modify the persistent configuration of a domain")); + unsigned int attach, int flags) +{ + struct qemud_driver *driver; + virDomainDeviceDefPtr device; + virDomainDefPtr vmdef; + virDomainObjPtr vm; + int ret = -1; + + if (!dom || !dom->conn || !dom->name || !xml) { + qemuReportError(VIR_ERR_INTERNAL_ERROR, + _("internal error : %s"), __FUNCTION__); + return -1; + } + /* + * When both of MODIFY_CONFIG and MODIFY_LIVE is specified at the same time, + * return error for now. We should support this later. + */ + if (flags & VIR_DOMAIN_DEVICE_MODIFY_LIVE) { + qemuReportError(VIR_ERR_INVALID_ARG, "%s", + _("Now, cannot modify alive domain and its definition " + "at the same time.")); return -1; } - return qemudDomainAttachDevice(dom, xml); + driver = dom->conn->privateData; + qemuDriverLock(driver); + vm = virDomainFindByUUID(&driver->domains, dom->uuid); + if (!vm) { + qemuReportError(VIR_ERR_NO_DOMAIN, _("cannot find domain '%s'"), + dom->name); + goto unlock_out; + } + + if (qemuDomainObjBeginJobWithDriver(driver, vm) < 0) + goto unlock_out; + + if (virDomainObjIsActive(vm)) { + /* + * For now, just allow updating inactive domains. Further development + * will allow updating both active domain and its config file at + * the same time. + */ + qemuReportError(VIR_ERR_OPERATION_INVALID, "%s", + _("Now, it's unsupported to update active domain's definition.")); + goto endjob; + } + + vmdef = virDomainObjGetPersistentDef(driver->caps, vm); + + if (!vmdef) + goto endjob; + + device = virDomainDeviceDefParse(driver->caps, + vmdef, xml, VIR_DOMAIN_XML_INACTIVE); + if (!device) + goto endjob; + + if (attach) + ret = qemuDomainAttachDevicePersistent(vmdef, device); + else + ret = qemuDomainDetachDevicePersistent(vmdef, device); + + if (!ret) /* save the result */ + ret = virDomainSaveConfig(driver->configDir, vmdef); + + virDomainDeviceDefFree(device); + +endjob: + if (qemuDomainObjEndJob(vm) == 0) + vm = NULL; + if (vm) + virDomainObjUnlock(vm); +unlock_out: + qemuDriverUnlock(driver); + return ret; +} + +static int qemudDomainAttachDeviceFlags(virDomainPtr dom, + const char *xml, + unsigned int flags) +{ + if (flags & VIR_DOMAIN_DEVICE_MODIFY_CONFIG) + return qemuDomainModifyDevicePersistent(dom, xml, 1, flags); + + if (flags & VIR_DOMAIN_DEVICE_MODIFY_LIVE) + return qemudDomainAttachDevice(dom, xml); + + qemuReportError(VIR_ERR_INVALID_ARG, + _("bad flag: %x only MODIFY_LIVE, MODIFY_CONFIG are supported now"), + flags); + + return -1; } @@ -4322,13 +4437,17 @@ cleanup: static int qemudDomainDetachDeviceFlags(virDomainPtr dom, const char *xml, unsigned int flags) { - if (flags & VIR_DOMAIN_DEVICE_MODIFY_CONFIG) { - qemuReportError(VIR_ERR_OPERATION_INVALID, - "%s", _("cannot modify the persistent configuration of a domain")); - return -1; - } - return qemudDomainDetachDevice(dom, xml); + if (flags & VIR_DOMAIN_DEVICE_MODIFY_CONFIG) + return qemuDomainModifyDevicePersistent(dom, xml, 0, flags); + + if (flags & VIR_DOMAIN_DEVICE_MODIFY_LIVE) + return qemudDomainDetachDevice(dom, xml); + + qemuReportError(VIR_ERR_INVALID_ARG, + _("bad flag: %x only MODIFY_LIVE, MODIFY_CONFIG are supported now"), + flags); + return -1; } static int qemudDomainGetAutostart(virDomainPtr dom, -- 1.7.4.1