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qemu: domain: Prepare for VCPUs vanishing while libvirt is not running

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Similarly to devices the guest may allow unplug of the VCPU if libvirt
is down. To avoid problems, refresh the vcpu state on reconnect. Don't
mess with the vcpu state otherwise.
This commit is contained in:
Peter Krempa 2016-08-05 14:48:27 +02:00
parent 6b4a23ff6c
commit 133be0a9e2
4 changed files with 17 additions and 6 deletions
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9
src/qemu/qemu_domain.c
View File

@ -5764,16 +5764,20 @@ qemuDomainSupportsNewVcpuHotplug(virDomainObjPtr vm)
* @driver: qemu driver data
* @vm: domain object
* @asyncJob: current asynchronous job type
* @state: refresh vcpu state
*
* Updates vCPU information private data of @vm. Due to historical reasons this
* function returns success even if some data were not reported by qemu.
*
* If @state is true, the vcpu state is refreshed as reported by the monitor.
*
* Returns 0 on success and -1 on fatal error.
*/
int
qemuDomainRefreshVcpuInfo(virQEMUDriverPtr driver,
virDomainObjPtr vm,
int asyncJob)
int asyncJob,
bool state)
{
virDomainVcpuDefPtr vcpu;
qemuDomainVcpuPrivatePtr vcpupriv;
@ -5841,6 +5845,9 @@ qemuDomainRefreshVcpuInfo(virQEMUDriverPtr driver,
VIR_FREE(vcpupriv->alias);
VIR_STEAL_PTR(vcpupriv->alias, info[i].alias);
vcpupriv->enable_id = info[i].id;
if (hotplug && state)
vcpu->online = !!info[i].qom_path;
}
ret = 0;

3
src/qemu/qemu_domain.h
View File

@ -660,7 +660,8 @@ pid_t qemuDomainGetVcpuPid(virDomainObjPtr vm, unsigned int vcpuid);
int qemuDomainValidateVcpuInfo(virDomainObjPtr vm);
int qemuDomainRefreshVcpuInfo(virQEMUDriverPtr driver,
virDomainObjPtr vm,
int asyncJob);
int asyncJob,
bool state);
bool qemuDomainSupportsNicdev(virDomainDefPtr def,
virDomainNetDefPtr net);

4
src/qemu/qemu_driver.c
View File

@ -4640,7 +4640,7 @@ qemuDomainHotplugAddVcpu(virQEMUDriverPtr driver,
vcpuinfo->online = true;
if (qemuDomainRefreshVcpuInfo(driver, vm, QEMU_ASYNC_JOB_NONE) < 0)
if (qemuDomainRefreshVcpuInfo(driver, vm, QEMU_ASYNC_JOB_NONE, false) < 0)
goto cleanup;
if (qemuDomainValidateVcpuInfo(vm) < 0)
@ -4689,7 +4689,7 @@ qemuDomainHotplugDelVcpu(virQEMUDriverPtr driver,
goto cleanup;
}
if (qemuDomainRefreshVcpuInfo(driver, vm, QEMU_ASYNC_JOB_NONE) < 0)
if (qemuDomainRefreshVcpuInfo(driver, vm, QEMU_ASYNC_JOB_NONE, false) < 0)
goto cleanup;
if (qemuDomainValidateVcpuInfo(vm) < 0) {

7
src/qemu/qemu_process.c
View File

@ -3354,6 +3354,9 @@ qemuProcessReconnect(void *opaque)
ignore_value(virSecurityManagerCheckAllLabel(driver->securityManager,
obj->def));
if (qemuDomainRefreshVcpuInfo(driver, obj, QEMU_ASYNC_JOB_NONE, true) < 0)
goto error;
if (virSecurityManagerReserveLabel(driver->securityManager, obj->def, obj->pid) < 0)
goto error;
@ -5234,7 +5237,7 @@ qemuProcessLaunch(virConnectPtr conn,
goto cleanup;
VIR_DEBUG("Refreshing VCPU info");
if (qemuDomainRefreshVcpuInfo(driver, vm, asyncJob) < 0)
if (qemuDomainRefreshVcpuInfo(driver, vm, asyncJob, false) < 0)
goto cleanup;
if (qemuDomainValidateVcpuInfo(vm) < 0)
@ -6029,7 +6032,7 @@ int qemuProcessAttach(virConnectPtr conn ATTRIBUTE_UNUSED,
}
VIR_DEBUG("Detecting VCPU PIDs");
if (qemuDomainRefreshVcpuInfo(driver, vm, QEMU_ASYNC_JOB_NONE) < 0)
if (qemuDomainRefreshVcpuInfo(driver, vm, QEMU_ASYNC_JOB_NONE, false) < 0)
goto error;
if (qemuDomainValidateVcpuInfo(vm) < 0)