[libvirt] [PATCH 04/11] qemu: Prepare for reuse of qemuDomainSetVcpusLive
Extract the call to qemuDomainSelectHotplugVcpuEntities outside of
qemuDomainSetVcpusLive and decide whether to hotplug or unplug the
entities specified by the cpumap using a boolean flag.
This will allow to use qemuDomainSetVcpusLive in cases where we prepare
the list of vcpus to enable or disable by other means.
---
src/qemu/qemu_driver.c | 31 +++++++++++++++++++++----------
1 file changed, 21 insertions(+), 10 deletions(-)
diff --git a/src/qemu/qemu_driver.c b/src/qemu/qemu_driver.c
index 842de0a..af8f458 100644
--- a/src/qemu/qemu_driver.c
+++ b/src/qemu/qemu_driver.c
@@ -4776,6 +4776,7 @@ qemuDomainSetVcpusMax(virQEMUDriverPtr driver,
*
* @def: domain definition
* @nvcpus: target vcpu count
+ * @enable: set to true if vcpus should be enabled
*
* Tries to find which vcpu entities need to be enabled or disabled to reach
* @nvcpus. This function works in order of the legacy hotplug but is able to
@@ -4785,7 +4786,8 @@ qemuDomainSetVcpusMax(virQEMUDriverPtr driver,
*/
static virBitmapPtr
qemuDomainSelectHotplugVcpuEntities(virDomainDefPtr def,
- unsigned int nvcpus)
+ unsigned int nvcpus,
+ bool *enable)
{
virBitmapPtr ret = NULL;
virDomainVcpuDefPtr vcpu;
@@ -4798,6 +4800,8 @@ qemuDomainSelectHotplugVcpuEntities(virDomainDefPtr def,
return NULL;
if (nvcpus > curvcpus) {
+ *enable = true;
+
for (i = 0; i < maxvcpus && curvcpus < nvcpus; i++) {
vcpu = virDomainDefGetVcpu(def, i);
vcpupriv = QEMU_DOMAIN_VCPU_PRIVATE(vcpu);
@@ -4820,6 +4824,8 @@ qemuDomainSelectHotplugVcpuEntities(virDomainDefPtr def,
ignore_value(virBitmapSetBit(ret, i));
}
} else {
+ *enable = false;
+
for (i = maxvcpus - 1; i >= 0 && curvcpus > nvcpus; i--) {
vcpu = virDomainDefGetVcpu(def, i);
vcpupriv = QEMU_DOMAIN_VCPU_PRIVATE(vcpu);
@@ -4865,22 +4871,19 @@ static int
qemuDomainSetVcpusLive(virQEMUDriverPtr driver,
virQEMUDriverConfigPtr cfg,
virDomainObjPtr vm,
- unsigned int nvcpus)
+ virBitmapPtr vcpumap,
+ bool enable)
{
qemuDomainObjPrivatePtr priv = vm->privateData;
qemuCgroupEmulatorAllNodesDataPtr emulatorCgroup = NULL;
- virBitmapPtr vcpumap = NULL;
ssize_t nextvcpu = -1;
int rc = 0;
int ret = -1;
- if (!(vcpumap = qemuDomainSelectHotplugVcpuEntities(vm->def, nvcpus)))
- goto cleanup;
-
if (qemuCgroupEmulatorAllNodesAllow(priv->cgroup, &emulatorCgroup) < 0)
goto cleanup;
- if (nvcpus > virDomainDefGetVcpus(vm->def)) {
+ if (enable) {
while ((nextvcpu = virBitmapNextSetBit(vcpumap, nextvcpu)) != -1) {
if ((rc = qemuDomainHotplugAddVcpu(driver, vm, nextvcpu)) < 0)
break;
@@ -4907,7 +4910,6 @@ qemuDomainSetVcpusLive(virQEMUDriverPtr driver,
cleanup:
qemuCgroupEmulatorAllNodesRestore(emulatorCgroup);
- virBitmapFree(vcpumap);
return ret;
}
@@ -4982,6 +4984,8 @@ qemuDomainSetVcpusInternal(virQEMUDriverPtr driver,
bool hotpluggable)
{
virQEMUDriverConfigPtr cfg = virQEMUDriverGetConfig(driver);
+ virBitmapPtr vcpumap = NULL;
+ bool enable;
int ret = -1;
if (def && nvcpus > virDomainDefGetVcpusMax(def)) {
@@ -5000,8 +5004,14 @@ qemuDomainSetVcpusInternal(virQEMUDriverPtr driver,
goto cleanup;
}
- if (def && qemuDomainSetVcpusLive(driver, cfg, vm, nvcpus) < 0)
- goto cleanup;
+ if (def) {
+ if (!(vcpumap = qemuDomainSelectHotplugVcpuEntities(vm->def, nvcpus,
+ &enable)))
+ goto cleanup;
+
+ if (qemuDomainSetVcpusLive(driver, cfg, vm, vcpumap, enable) < 0)
+ goto cleanup;
+ }
if (persistentDef) {
qemuDomainSetVcpusConfig(persistentDef, nvcpus, hotpluggable);
@@ -5013,6 +5023,7 @@ qemuDomainSetVcpusInternal(virQEMUDriverPtr driver,
ret = 0;
cleanup:
+ virBitmapFree(vcpumap);
virObjectUnref(cfg);
return ret;
}
--
2.10.2