[libvirt] [PATCHv6 1/3] libvirt/qemu - support persistent modification of devices.

Thank you for comments. This is a rebased/fixed one. = From: KAMEZAWA Hiroyuki <kamezawa.hiroyu(a)jp.fujitsu.com&gt; Date: Wed, 23 Mar 2011 17:45:12 +0900 Subject: [PATCHv6 1/3] libvirt/qemu - support persistent modification of devices. Now, qemudDomainAttachDeviceFlags() and qemudDomainDetachDeviceFlags() doesn't support VIR_DOMAIN_DEVICE_MODIFY_CONFIG. By this, virsh's at(de)tatch-device --persistent cannot modify qemu config. (Xen allows it.) This patch is a base patch for adding support of devices in step by step manner. Following patches will add some device support. Signed-off-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu(a)jp.fujitsu.com&gt; Changelog v5->v6 - fixed Indentation - clean up. Changelog v4->v5: - fixed error codes at reporting Error. - fixed unlock code after calling qemuDomainObjBeginJobWithDriver() - fixed virDomainFindByUUID() to be virDomainFindByName() - fixed spelling, indent, etc.. - removed unnecessary checks. --- src/qemu/qemu_driver.c | 137 +++++++++++++++++++++++++++++++++++++++++++----- 1 files changed, 124 insertions(+), 13 deletions(-) diff --git a/src/qemu/qemu_driver.c b/src/qemu/qemu_driver.c index 6f296c9..468361b 100644 --- a/src/qemu/qemu_driver.c +++ b/src/qemu/qemu_driver.c @@ -4140,16 +4140,124 @@ cleanup: return ret; } -static int qemudDomainAttachDeviceFlags(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")); +/* + * 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) +{ + + switch(newdev->type) { + default: + qemuReportError(VIR_ERR_CONFIG_UNSUPPORTED, "%s", + _("Sorry, the device is not supported for now")); + return -1; + } + + return 0; +} + +static int qemuDomainDetachDevicePersistent(virDomainDefPtr vmdef, + virDomainDeviceDefPtr device) +{ + switch(device->type) { + default: + qemuReportError(VIR_ERR_CONFIG_UNSUPPORTED, "%s", + _("Sorry, the device is not supported for now")); return -1; } + return 0; +} + +static int qemuDomainModifyDevicePersistent(virDomainPtr dom, + const char *xml, + unsigned int attach, unsigned int flags) +{ + struct qemud_driver *driver; + virDomainDeviceDefPtr device; + virDomainDefPtr vmdef; + virDomainObjPtr vm; + int ret = -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_OPERATION_INVALID, "%s", + _("Now, cannot modify alive domain and its definition " + "at the same time.")); + return -1; + } + + driver = dom->conn->privateData; + qemuDriverLock(driver); + vm = virDomainFindByName(&driver->domains, dom->name); + if (!vm) { + qemuReportError(VIR_ERR_NO_DOMAIN, _("no domain with name : '%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", + _("unsupported to update active domain's definition.")); + goto endjob; + } + + vmdef = virDomainObjGetPersistentDef(driver->caps, vm); - return qemudDomainAttachDevice(dom, xml); + 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; +unlock_out: + if (vm) + virDomainObjUnlock(vm); + 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 not supported"), flags); + + return -1; } @@ -4364,13 +4472,16 @@ 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 not supported now"), flags); + return -1; } static int qemudDomainGetAutostart(virDomainPtr dom, -- 1.7.4.1