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qemu: capabilities: Extract availability of new cpu hotplug for machine types

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QEMU reports whether 'query-hotpluggable-cpus' is supported for a given
machine type. Extract and cache the information using the capability
cache.

When copying the capabilities for a new start of qemu, mask out the
presence of QEMU_CAPS_QUERY_HOTPLUGGABLE_CPUS if the machine type
doesn't support hotpluggable cpus.
This commit is contained in:
Peter Krempa 2016-07-29 09:45:19 +02:00
parent ffa536e0f8
commit 920bbe5c15
5 changed files with 61 additions and 28 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

29
src/qemu/qemu_capabilities.c
View File

@ -349,6 +349,7 @@ struct virQEMUCapsMachineType {
char *name;
char *alias;
unsigned int maxCpus;
bool hotplugCpus;
};
/*
* Update the XML parser/formatter when adding more
@ -550,6 +551,7 @@ virQEMUCapsParseMachineTypesStr(const char *output,
}
/* When parsing from command line we don't have information about maxCpus */
qemuCaps->machineTypes[qemuCaps->nmachineTypes-1].maxCpus = 0;
qemuCaps->machineTypes[qemuCaps->nmachineTypes-1].hotplugCpus = false;
} while ((p = next));
@ -2105,6 +2107,7 @@ virQEMUCapsPtr virQEMUCapsNewCopy(virQEMUCapsPtr qemuCaps)
VIR_STRDUP(ret->machineTypes[i].alias, qemuCaps->machineTypes[i].alias) < 0)
goto error;
ret->machineTypes[i].maxCpus = qemuCaps->machineTypes[i].maxCpus;
ret->machineTypes[i].hotplugCpus = qemuCaps->machineTypes[i].hotplugCpus;
}
if (VIR_ALLOC_N(ret->gicCapabilities, qemuCaps->ngicCapabilities) < 0)
@ -2414,6 +2417,20 @@ int virQEMUCapsGetMachineMaxCpus(virQEMUCapsPtr qemuCaps,
}
bool virQEMUCapsGetMachineHotplugCpus(virQEMUCapsPtr qemuCaps,
const char *name)
{
size_t i;
for (i = 0; i < qemuCaps->nmachineTypes; i++) {
if (STREQ_NULLABLE(qemuCaps->machineTypes[i].name, name))
return qemuCaps->machineTypes[i].hotplugCpus;
}
return false;
}
/**
* virQEMUCapsSetGICCapabilities:
* @qemuCaps: QEMU capabilities
@ -2572,6 +2589,7 @@ virQEMUCapsProbeQMPMachineTypes(virQEMUCapsPtr qemuCaps,
goto cleanup;
mach->maxCpus = machines[i]->maxCpus;
mach->hotplugCpus = machines[i]->hotplugCpus;
if (machines[i]->isDefault)
defIdx = qemuCaps->nmachineTypes - 1;
@ -2830,7 +2848,7 @@ int virQEMUCapsProbeQMP(virQEMUCapsPtr qemuCaps,
* ...
* <cpu name="pentium3"/>
* ...
* <machine name="pc-1.0" alias="pc" maxCpus="4"/>
* <machine name="pc-1.0" alias="pc" hotplugCpus='yes' maxCpus="4"/>
* ...
* </qemuCaps>
*/
@ -2991,6 +3009,11 @@ virQEMUCapsLoadCache(virQEMUCapsPtr qemuCaps, const char *filename,
goto cleanup;
}
VIR_FREE(str);
str = virXMLPropString(nodes[i], "hotplugCpus");
if (STREQ_NULLABLE(str, "yes"))
qemuCaps->machineTypes[i].hotplugCpus = true;
VIR_FREE(str);
}
}
VIR_FREE(nodes);
@ -3124,6 +3147,8 @@ virQEMUCapsFormatCache(virQEMUCapsPtr qemuCaps,
if (qemuCaps->machineTypes[i].alias)
virBufferEscapeString(&buf, " alias='%s'",
qemuCaps->machineTypes[i].alias);
if (qemuCaps->machineTypes[i].hotplugCpus)
virBufferAddLit(&buf, " hotplugCpus='yes'");
virBufferAsprintf(&buf, " maxCpus='%u'/>\n",
qemuCaps->machineTypes[i].maxCpus);
}
@ -3912,6 +3937,8 @@ virQEMUCapsFilterByMachineType(virQEMUCapsPtr qemuCaps,
virQEMUCapsClear(qemuCaps, filter->flags[j]);
}
if (!virQEMUCapsGetMachineHotplugCpus(qemuCaps, machineType))
virQEMUCapsClear(qemuCaps, QEMU_CAPS_QUERY_HOTPLUGGABLE_CPUS);
}

2
src/qemu/qemu_capabilities.h
View File

@ -428,6 +428,8 @@ const char *virQEMUCapsGetCanonicalMachine(virQEMUCapsPtr qemuCaps,
const char *name);
int virQEMUCapsGetMachineMaxCpus(virQEMUCapsPtr qemuCaps,
const char *name);
bool virQEMUCapsGetMachineHotplugCpus(virQEMUCapsPtr qemuCaps,
const char *name);
int virQEMUCapsGetMachineTypesCaps(virQEMUCapsPtr qemuCaps,
size_t *nmachines,
virCapsGuestMachinePtr **machines);

1
src/qemu/qemu_monitor.h
View File

@ -854,6 +854,7 @@ struct _qemuMonitorMachineInfo {
bool isDefault;
char *alias;
unsigned int maxCpus;
bool hotplugCpus;
};
int qemuMonitorGetMachines(qemuMonitorPtr mon,

3
src/qemu/qemu_monitor_json.c
View File

@ -4840,6 +4840,9 @@ int qemuMonitorJSONGetMachines(qemuMonitorPtr mon,
_("query-machines reply has malformed 'cpu-max' data"));
goto cleanup;
}
ignore_value(virJSONValueObjectGetBoolean(child, "hotpluggable-cpus",
&info->hotplugCpus));
}
ret = n;

54
tests/qemucapabilitiesdata/caps_2.7.0.x86_64.xml
View File

@ -227,31 +227,31 @@
<cpu name='core2duo'/>
<cpu name='phenom'/>
<cpu name='qemu64'/>
<machine name='pc-i440fx-2.7' alias='pc' maxCpus='255'/>
<machine name='pc-0.12' maxCpus='255'/>
<machine name='pc-i440fx-2.4' maxCpus='255'/>
<machine name='pc-1.3' maxCpus='255'/>
<machine name='pc-q35-2.7' alias='q35' maxCpus='255'/>
<machine name='pc-q35-2.6' maxCpus='255'/>
<machine name='pc-i440fx-1.7' maxCpus='255'/>
<machine name='pc-i440fx-1.6' maxCpus='255'/>
<machine name='pc-0.11' maxCpus='255'/>
<machine name='pc-i440fx-2.3' maxCpus='255'/>
<machine name='pc-0.10' maxCpus='255'/>
<machine name='pc-1.2' maxCpus='255'/>
<machine name='pc-i440fx-2.2' maxCpus='255'/>
<machine name='isapc' maxCpus='1'/>
<machine name='pc-q35-2.5' maxCpus='255'/>
<machine name='pc-0.15' maxCpus='255'/>
<machine name='pc-i440fx-1.5' maxCpus='255'/>
<machine name='pc-0.14' maxCpus='255'/>
<machine name='pc-i440fx-2.6' maxCpus='255'/>
<machine name='pc-i440fx-1.4' maxCpus='255'/>
<machine name='pc-i440fx-2.5' maxCpus='255'/>
<machine name='pc-1.1' maxCpus='255'/>
<machine name='pc-i440fx-2.1' maxCpus='255'/>
<machine name='pc-1.0' maxCpus='255'/>
<machine name='pc-i440fx-2.0' maxCpus='255'/>
<machine name='pc-q35-2.4' maxCpus='255'/>
<machine name='pc-0.13' maxCpus='255'/>
<machine name='pc-i440fx-2.7' alias='pc' hotplugCpus='yes' maxCpus='255'/>
<machine name='pc-0.12' hotplugCpus='yes' maxCpus='255'/>
<machine name='pc-i440fx-2.4' hotplugCpus='yes' maxCpus='255'/>
<machine name='pc-1.3' hotplugCpus='yes' maxCpus='255'/>
<machine name='pc-q35-2.7' alias='q35' hotplugCpus='yes' maxCpus='255'/>
<machine name='pc-q35-2.6' hotplugCpus='yes' maxCpus='255'/>
<machine name='pc-i440fx-1.7' hotplugCpus='yes' maxCpus='255'/>
<machine name='pc-i440fx-1.6' hotplugCpus='yes' maxCpus='255'/>
<machine name='pc-0.11' hotplugCpus='yes' maxCpus='255'/>
<machine name='pc-i440fx-2.3' hotplugCpus='yes' maxCpus='255'/>
<machine name='pc-0.10' hotplugCpus='yes' maxCpus='255'/>
<machine name='pc-1.2' hotplugCpus='yes' maxCpus='255'/>
<machine name='pc-i440fx-2.2' hotplugCpus='yes' maxCpus='255'/>
<machine name='isapc' hotplugCpus='yes' maxCpus='1'/>
<machine name='pc-q35-2.5' hotplugCpus='yes' maxCpus='255'/>
<machine name='pc-0.15' hotplugCpus='yes' maxCpus='255'/>
<machine name='pc-i440fx-1.5' hotplugCpus='yes' maxCpus='255'/>
<machine name='pc-0.14' hotplugCpus='yes' maxCpus='255'/>
<machine name='pc-i440fx-2.6' hotplugCpus='yes' maxCpus='255'/>
<machine name='pc-i440fx-1.4' hotplugCpus='yes' maxCpus='255'/>
<machine name='pc-i440fx-2.5' hotplugCpus='yes' maxCpus='255'/>
<machine name='pc-1.1' hotplugCpus='yes' maxCpus='255'/>
<machine name='pc-i440fx-2.1' hotplugCpus='yes' maxCpus='255'/>
<machine name='pc-1.0' hotplugCpus='yes' maxCpus='255'/>
<machine name='pc-i440fx-2.0' hotplugCpus='yes' maxCpus='255'/>
<machine name='pc-q35-2.4' hotplugCpus='yes' maxCpus='255'/>
<machine name='pc-0.13' hotplugCpus='yes' maxCpus='255'/>
</qemuCaps>