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qemu: Remove devices only after DEVICE_DELETED event

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This commit is contained in:
Jiri Denemark 2013-07-11 17:11:02 +02:00
parent ab47cc9bf9
commit 3fbf78bdf3
5 changed files with 199 additions and 6 deletions
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4
src/qemu/qemu_domain.c
View File

@ -220,6 +220,9 @@ qemuDomainObjPrivateAlloc(void)
goto error;
}
if (virCondInit(&priv->unplugFinished) < 0)
goto error;
if (!(priv->devs = virChrdevAlloc()))
goto error;
@ -248,6 +251,7 @@ qemuDomainObjPrivateFree(void *data)
VIR_FREE(priv->lockState);
VIR_FREE(priv->origname);
virCondDestroy(&priv->unplugFinished);
virChrdevFree(priv->devs);
/* This should never be non-NULL if we get here, but just in case... */

3
src/qemu/qemu_domain.h
View File

@ -168,6 +168,9 @@ struct _qemuDomainObjPrivate {
size_t ncleanupCallbacks_max;
virCgroupPtr cgroup;
virCond unplugFinished; /* signals that unpluggingDevice was unplugged */
const char *unpluggingDevice; /* alias of the device that is being unplugged */
};
typedef enum {

159
src/qemu/qemu_hotplug.c
View File

@ -48,6 +48,7 @@
#include "device_conf.h"
#include "virstoragefile.h"
#include "virstring.h"
#include "virtime.h"
#define VIR_FROM_THIS VIR_FROM_QEMU
#define CHANGE_MEDIA_RETRIES 10
@ -2488,6 +2489,122 @@ qemuDomainRemoveChrDevice(virQEMUDriverPtr driver ATTRIBUTE_UNUSED,
}
void
qemuDomainRemoveDevice(virQEMUDriverPtr driver,
virDomainObjPtr vm,
virDomainDeviceDefPtr dev)
{
switch ((virDomainDeviceType) dev->type) {
case VIR_DOMAIN_DEVICE_DISK:
qemuDomainRemoveDiskDevice(driver, vm, dev->data.disk);
break;
case VIR_DOMAIN_DEVICE_CONTROLLER:
qemuDomainRemoveControllerDevice(driver, vm, dev->data.controller);
break;
case VIR_DOMAIN_DEVICE_NET:
qemuDomainRemoveNetDevice(driver, vm, dev->data.net);
break;
case VIR_DOMAIN_DEVICE_HOSTDEV:
qemuDomainRemoveHostDevice(driver, vm, dev->data.hostdev);
break;
case VIR_DOMAIN_DEVICE_CHR:
qemuDomainRemoveChrDevice(driver, vm, dev->data.chr);
break;
case VIR_DOMAIN_DEVICE_NONE:
case VIR_DOMAIN_DEVICE_LEASE:
case VIR_DOMAIN_DEVICE_FS:
case VIR_DOMAIN_DEVICE_INPUT:
case VIR_DOMAIN_DEVICE_SOUND:
case VIR_DOMAIN_DEVICE_VIDEO:
case VIR_DOMAIN_DEVICE_WATCHDOG:
case VIR_DOMAIN_DEVICE_GRAPHICS:
case VIR_DOMAIN_DEVICE_HUB:
case VIR_DOMAIN_DEVICE_REDIRDEV:
case VIR_DOMAIN_DEVICE_SMARTCARD:
case VIR_DOMAIN_DEVICE_MEMBALLOON:
case VIR_DOMAIN_DEVICE_NVRAM:
case VIR_DOMAIN_DEVICE_RNG:
case VIR_DOMAIN_DEVICE_LAST:
virReportError(VIR_ERR_OPERATION_UNSUPPORTED,
_("don't know how to remove a %s device"),
virDomainDeviceTypeToString(dev->type));
break;
}
}
/* Wait up to 5 seconds for device removal to finish. */
#define QEMU_REMOVAL_WAIT_TIME (1000ull * 5)
static void
qemuDomainMarkDeviceForRemoval(virDomainObjPtr vm,
virDomainDeviceInfoPtr info)
{
qemuDomainObjPrivatePtr priv = vm->privateData;
if (virQEMUCapsGet(priv->qemuCaps, QEMU_CAPS_DEVICE_DEL_EVENT))
priv->unpluggingDevice = info->alias;
else
priv->unpluggingDevice = NULL;
}
static void
qemuDomainResetDeviceRemoval(virDomainObjPtr vm)
{
qemuDomainObjPrivatePtr priv = vm->privateData;
priv->unpluggingDevice = NULL;
}
/* Returns:
* -1 on error
* 0 when DEVICE_DELETED event is unsupported
* 1 when device removal finished
* 2 device removal did not finish in QEMU_REMOVAL_WAIT_TIME
*/
static int
qemuDomainWaitForDeviceRemoval(virDomainObjPtr vm)
{
qemuDomainObjPrivatePtr priv = vm->privateData;
unsigned long long until;
if (!virQEMUCapsGet(priv->qemuCaps, QEMU_CAPS_DEVICE_DEL_EVENT))
return 0;
if (virTimeMillisNow(&until) < 0)
return -1;
until += QEMU_REMOVAL_WAIT_TIME;
while (priv->unpluggingDevice) {
if (virCondWaitUntil(&priv->unplugFinished,
&vm->parent.lock, until) < 0) {
if (errno == ETIMEDOUT) {
return 2;
} else {
virReportSystemError(errno, "%s",
_("Unable to wait on unplug condition"));
return -1;
}
}
}
return 1;
}
void
qemuDomainSignalDeviceRemoval(virDomainObjPtr vm,
const char *devAlias)
{
qemuDomainObjPrivatePtr priv = vm->privateData;
if (STREQ_NULLABLE(priv->unpluggingDevice, devAlias)) {
qemuDomainResetDeviceRemoval(vm);
virCondSignal(&priv->unplugFinished);
}
}
int qemuDomainDetachVirtioDiskDevice(virQEMUDriverPtr driver,
virDomainObjPtr vm,
virDomainDiskDefPtr detach)
@ -2526,6 +2643,8 @@ int qemuDomainDetachVirtioDiskDevice(virQEMUDriverPtr driver,
QEMU_DRIVE_HOST_PREFIX, detach->info.alias) < 0)
goto cleanup;
qemuDomainMarkDeviceForRemoval(vm, &detach->info);
qemuDomainObjEnterMonitor(driver, vm);
if (virQEMUCapsGet(priv->qemuCaps, QEMU_CAPS_DEVICE)) {
if (qemuMonitorDelDevice(priv->mon, detach->info.alias) < 0) {
@ -2547,10 +2666,12 @@ int qemuDomainDetachVirtioDiskDevice(virQEMUDriverPtr driver,
qemuDomainObjExitMonitor(driver, vm);
qemuDomainRemoveDiskDevice(driver, vm, detach);
if (!qemuDomainWaitForDeviceRemoval(vm))
qemuDomainRemoveDiskDevice(driver, vm, detach);
ret = 0;
cleanup:
qemuDomainResetDeviceRemoval(vm);
VIR_FREE(drivestr);
return ret;
}
@ -2583,6 +2704,8 @@ int qemuDomainDetachDiskDevice(virQEMUDriverPtr driver,
QEMU_DRIVE_HOST_PREFIX, detach->info.alias) < 0)
goto cleanup;
qemuDomainMarkDeviceForRemoval(vm, &detach->info);
qemuDomainObjEnterMonitor(driver, vm);
if (qemuMonitorDelDevice(priv->mon, detach->info.alias) < 0) {
qemuDomainObjExitMonitor(driver, vm);
@ -2595,10 +2718,12 @@ int qemuDomainDetachDiskDevice(virQEMUDriverPtr driver,
qemuDomainObjExitMonitor(driver, vm);
qemuDomainRemoveDiskDevice(driver, vm, detach);
if (!qemuDomainWaitForDeviceRemoval(vm))
qemuDomainRemoveDiskDevice(driver, vm, detach);
ret = 0;
cleanup:
qemuDomainResetDeviceRemoval(vm);
VIR_FREE(drivestr);
return ret;
}
@ -2698,6 +2823,8 @@ int qemuDomainDetachPciControllerDevice(virQEMUDriverPtr driver,
goto cleanup;
}
qemuDomainMarkDeviceForRemoval(vm, &detach->info);
qemuDomainObjEnterMonitor(driver, vm);
if (virQEMUCapsGet(priv->qemuCaps, QEMU_CAPS_DEVICE)) {
if (qemuMonitorDelDevice(priv->mon, detach->info.alias)) {
@ -2713,11 +2840,13 @@ int qemuDomainDetachPciControllerDevice(virQEMUDriverPtr driver,
}
qemuDomainObjExitMonitor(driver, vm);
qemuDomainRemoveControllerDevice(driver, vm, detach);
if (!qemuDomainWaitForDeviceRemoval(vm))
qemuDomainRemoveControllerDevice(driver, vm, detach);
ret = 0;
cleanup:
qemuDomainResetDeviceRemoval(vm);
return ret;
}
@ -2745,6 +2874,8 @@ qemuDomainDetachHostPciDevice(virQEMUDriverPtr driver,
return -1;
}
qemuDomainMarkDeviceForRemoval(vm, detach->info);
qemuDomainObjEnterMonitor(driver, vm);
if (virQEMUCapsGet(priv->qemuCaps, QEMU_CAPS_DEVICE)) {
ret = qemuMonitorDelDevice(priv->mon, detach->info->alias);
@ -2776,6 +2907,8 @@ qemuDomainDetachHostUsbDevice(virQEMUDriverPtr driver,
return -1;
}
qemuDomainMarkDeviceForRemoval(vm, detach->info);
qemuDomainObjEnterMonitor(driver, vm);
ret = qemuMonitorDelDevice(priv->mon, detach->info->alias);
qemuDomainObjExitMonitor(driver, vm);
@ -2811,6 +2944,8 @@ qemuDomainDetachHostScsiDevice(virQEMUDriverPtr driver,
if (!(devstr = qemuBuildSCSIHostdevDevStr(vm->def, detach, priv->qemuCaps)))
goto cleanup;
qemuDomainMarkDeviceForRemoval(vm, detach->info);
qemuDomainObjEnterMonitor(driver, vm);
if ((ret = qemuMonitorDelDevice(priv->mon, detach->info->alias)) == 0) {
if ((ret = qemuMonitorDriveDel(priv->mon, drvstr)) < 0) {
@ -2859,9 +2994,11 @@ qemuDomainDetachThisHostDevice(virQEMUDriverPtr driver,
if (ret < 0)
virDomainAuditHostdev(vm, detach, "detach", false);
else
else if (!qemuDomainWaitForDeviceRemoval(vm))
qemuDomainRemoveHostDevice(driver, vm, detach);
qemuDomainResetDeviceRemoval(vm);
return ret;
}
@ -2992,6 +3129,8 @@ qemuDomainDetachNetDevice(virQEMUDriverPtr driver,
if (virAsprintf(&hostnet_name, "host%s", detach->info.alias) < 0)
goto cleanup;
qemuDomainMarkDeviceForRemoval(vm, &detach->info);
qemuDomainObjEnterMonitor(driver, vm);
if (virQEMUCapsGet(priv->qemuCaps, QEMU_CAPS_DEVICE)) {
if (qemuMonitorDelDevice(priv->mon, detach->info.alias) < 0) {
@ -3024,9 +3163,13 @@ qemuDomainDetachNetDevice(virQEMUDriverPtr driver,
}
qemuDomainObjExitMonitor(driver, vm);
qemuDomainRemoveNetDevice(driver, vm, detach);
if (!qemuDomainWaitForDeviceRemoval(vm))
qemuDomainRemoveNetDevice(driver, vm, detach);
ret = 0;
cleanup:
qemuDomainResetDeviceRemoval(vm);
VIR_FREE(hostnet_name);
return ret;
}
@ -3171,6 +3314,8 @@ int qemuDomainDetachChrDevice(virQEMUDriverPtr driver,
if (virAsprintf(&charAlias, "char%s", tmpChr->info.alias) < 0)
goto cleanup;
qemuDomainMarkDeviceForRemoval(vm, &tmpChr->info);
qemuDomainObjEnterMonitor(driver, vm);
if (devstr && qemuMonitorDelDevice(priv->mon, tmpChr->info.alias) < 0) {
qemuDomainObjExitMonitor(driver, vm);
@ -3183,10 +3328,12 @@ int qemuDomainDetachChrDevice(virQEMUDriverPtr driver,
}
qemuDomainObjExitMonitor(driver, vm);
qemuDomainRemoveChrDevice(driver, vm, tmpChr);
if (!qemuDomainWaitForDeviceRemoval(vm))
qemuDomainRemoveChrDevice(driver, vm, tmpChr);
ret = 0;
cleanup:
qemuDomainResetDeviceRemoval(vm);
VIR_FREE(devstr);
VIR_FREE(charAlias);
return ret;

7
src/qemu/qemu_hotplug.h
View File

@ -119,4 +119,11 @@ virDomainChrDefPtr
qemuDomainChrRemove(virDomainDefPtr vmdef,
virDomainChrDefPtr chr);
void qemuDomainRemoveDevice(virQEMUDriverPtr driver,
virDomainObjPtr vm,
virDomainDeviceDefPtr dev);
void qemuDomainSignalDeviceRemoval(virDomainObjPtr vm,
const char *devAlias);
#endif /* __QEMU_HOTPLUG_H__ */

32
src/qemu/qemu_process.c
View File

@ -1313,6 +1313,37 @@ cleanup:
}
static int
qemuProcessHandleDeviceDeleted(qemuMonitorPtr mon ATTRIBUTE_UNUSED,
virDomainObjPtr vm,
const char *devAlias)
{
virQEMUDriverPtr driver = qemu_driver;
virQEMUDriverConfigPtr cfg = virQEMUDriverGetConfig(driver);
virDomainDeviceDef dev;
virObjectLock(vm);
VIR_DEBUG("Device %s removed from domain %p %s",
devAlias, vm, vm->def->name);
qemuDomainSignalDeviceRemoval(vm, devAlias);
if (virDomainDefFindDevice(vm->def, devAlias, &dev) < 0)
goto cleanup;
qemuDomainRemoveDevice(driver, vm, &dev);
if (virDomainSaveStatus(driver->xmlopt, cfg->stateDir, vm) < 0)
VIR_WARN("unable to save domain status with balloon change");
cleanup:
virObjectUnlock(vm);
virObjectUnref(cfg);
return 0;
}
static qemuMonitorCallbacks monitorCallbacks = {
.destroy = qemuProcessHandleMonitorDestroy,
.eofNotify = qemuProcessHandleMonitorEOF,
@ -1333,6 +1364,7 @@ static qemuMonitorCallbacks monitorCallbacks = {
.domainBalloonChange = qemuProcessHandleBalloonChange,
.domainPMSuspendDisk = qemuProcessHandlePMSuspendDisk,
.domainGuestPanic = qemuProcessHandleGuestPanic,
.domainDeviceDeleted = qemuProcessHandleDeviceDeleted,
};
static int