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qemu: remove support for query-cpus

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The query-cpus-fast command was introduced in 2.12, therefore
query-cpus is never used on supported versions of QEMU.  Remove
the logic to parse its output, as well as the parameters to
choose between the two commands.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Reviewed-by: Peter Krempa <pkrempa@redhat.com>
This commit is contained in:
Paolo Bonzini 2022-08-08 17:15:07 +02:00 committed by Peter Krempa
parent cf1c191155
commit b1f57ef0fd
6 changed files with 30 additions and 78 deletions
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22
src/qemu/qemu_domain.c
View File

@ -9618,22 +9618,18 @@ qemuDomainRefreshVcpuInfo(virQEMUDriver *driver,
size_t maxvcpus = virDomainDefGetVcpusMax(vm->def);
size_t i, j;
bool hotplug;
bool fast;
bool validTIDs = true;
int rc;
int ret = -1;
hotplug = qemuDomainSupportsNewVcpuHotplug(vm);
fast = virQEMUCapsGet(QEMU_DOMAIN_PRIVATE(vm)->qemuCaps,
QEMU_CAPS_QUERY_CPUS_FAST);
VIR_DEBUG("Maxvcpus %zu hotplug %d fast query %d", maxvcpus, hotplug, fast);
VIR_DEBUG("Maxvcpus %zu hotplug %d", maxvcpus, hotplug);
if (qemuDomainObjEnterMonitorAsync(driver, vm, asyncJob) < 0)
return -1;
rc = qemuMonitorGetCPUInfo(qemuDomainGetMonitor(vm), &info, maxvcpus,
hotplug, fast);
hotplug);
qemuDomainObjExitMonitor(vm);
@ -9641,7 +9637,7 @@ qemuDomainRefreshVcpuInfo(virQEMUDriver *driver,
goto cleanup;
/*
* The query-cpus[-fast] commands return information
* The query-cpus-fast commands return information
* about the vCPUs, including the OS level PID that
* is executing the vCPU.
*
@ -9766,7 +9762,6 @@ qemuDomainRefreshVcpuHalted(virQEMUDriver *driver,
size_t maxvcpus = virDomainDefGetVcpusMax(vm->def);
g_autoptr(virBitmap) haltedmap = NULL;
size_t i;
bool fast;
/* Not supported currently for TCG, see qemuDomainRefreshVcpuInfo */
if (vm->def->virtType == VIR_DOMAIN_VIRT_QEMU)
@ -9774,21 +9769,14 @@ qemuDomainRefreshVcpuHalted(virQEMUDriver *driver,
/* The halted state is interesting only on s390(x). On other platforms
* the data would be stale at the time when it would be used.
* Calling qemuMonitorGetCpuHalted() can adversely affect the running
* VM's performance unless QEMU supports query-cpus-fast.
*/
if (!ARCH_IS_S390(vm->def->os.arch) ||
!virQEMUCapsGet(QEMU_DOMAIN_PRIVATE(vm)->qemuCaps,
QEMU_CAPS_QUERY_CPUS_FAST))
if (!ARCH_IS_S390(vm->def->os.arch))
return 0;
if (qemuDomainObjEnterMonitorAsync(driver, vm, asyncJob) < 0)
return -1;
fast = virQEMUCapsGet(QEMU_DOMAIN_PRIVATE(vm)->qemuCaps,
QEMU_CAPS_QUERY_CPUS_FAST);
haltedmap = qemuMonitorGetCpuHalted(qemuDomainGetMonitor(vm), maxvcpus,
fast);
haltedmap = qemuMonitorGetCpuHalted(qemuDomainGetMonitor(vm), maxvcpus);
qemuDomainObjExitMonitor(vm);
if (!haltedmap)

29
src/qemu/qemu_monitor.c
View File

@ -1565,16 +1565,16 @@ qemuMonitorGetCPUInfoLegacy(struct qemuMonitorQueryCpusEntry *cpuentries,
*
* This function stitches together data retrieved via query-hotpluggable-cpus
* which returns entities on the hotpluggable level (which may describe more
* than one guest logical vcpu) with the output of query-cpus (or
* query-cpus-fast), having an entry per enabled guest logical vcpu.
* than one guest logical vcpu) with the output of query-cpus-fast,
* having an entry per enabled guest logical vcpu.
*
* query-hotpluggable-cpus conveys following information:
* - topology information and number of logical vcpus this entry creates
* - device type name of the entry that needs to be used when hotplugging
* - qom path in qemu which can be used to map the entry against
* query-cpus[-fast]
* query-cpus-fast
*
* query-cpus[-fast] conveys following information:
* query-cpus-fast conveys following information:
* - thread id of a given guest logical vcpu
* - order in which the vcpus were inserted
* - qom path to allow mapping the two together
@ -1609,7 +1609,7 @@ qemuMonitorGetCPUInfoHotplug(struct qemuMonitorQueryHotpluggableCpusEntry *hotpl
for (i = 0; i < nhotplugvcpus; i++)
totalvcpus += hotplugvcpus[i].vcpus;
/* trim '/thread...' suffix from the data returned by query-cpus[-fast] */
/* trim '/thread...' suffix from the data returned by query-cpus-fast */
for (i = 0; i < ncpuentries; i++) {
if (cpuentries[i].qom_path &&
(tmp = strstr(cpuentries[i].qom_path, "/thread")))
@ -1622,7 +1622,7 @@ qemuMonitorGetCPUInfoHotplug(struct qemuMonitorQueryHotpluggableCpusEntry *hotpl
}
/* Note the order in which the hotpluggable entities are inserted by
* matching them to the query-cpus[-fast] entries */
* matching them to the query-cpus-fast entries */
for (i = 0; i < ncpuentries; i++) {
for (j = 0; j < nhotplugvcpus; j++) {
if (!cpuentries[i].qom_path ||
@ -1679,7 +1679,7 @@ qemuMonitorGetCPUInfoHotplug(struct qemuMonitorQueryHotpluggableCpusEntry *hotpl
}
if (anyvcpu == maxvcpus) {
VIR_DEBUG("too many query-cpus[-fast] entries for a given "
VIR_DEBUG("too many query-cpus-fast entries for a given "
"query-hotpluggable-cpus entry");
return -1;
}
@ -1707,7 +1707,6 @@ qemuMonitorGetCPUInfoHotplug(struct qemuMonitorQueryHotpluggableCpusEntry *hotpl
* @vcpus: pointer filled by array of qemuMonitorCPUInfo structures
* @maxvcpus: total possible number of vcpus
* @hotplug: query data relevant for hotplug support
* @fast: use QMP query-cpus-fast if supported
*
* Detects VCPU information. If qemu doesn't support or fails reporting
* information this function will return success as other parts of libvirt
@ -1720,8 +1719,7 @@ int
qemuMonitorGetCPUInfo(qemuMonitor *mon,
qemuMonitorCPUInfo **vcpus,
size_t maxvcpus,
bool hotplug,
bool fast)
bool hotplug)
{
struct qemuMonitorQueryHotpluggableCpusEntry *hotplugcpus = NULL;
size_t nhotplugcpus = 0;
@ -1742,8 +1740,7 @@ qemuMonitorGetCPUInfo(qemuMonitor *mon,
(qemuMonitorJSONGetHotpluggableCPUs(mon, &hotplugcpus, &nhotplugcpus)) < 0)
goto cleanup;
rc = qemuMonitorJSONQueryCPUs(mon, &cpuentries, &ncpuentries, hotplug,
fast);
rc = qemuMonitorJSONQueryCPUs(mon, &cpuentries, &ncpuentries, hotplug);
if (rc < 0) {
if (!hotplug && rc == -2) {
@ -1779,12 +1776,11 @@ qemuMonitorGetCPUInfo(qemuMonitor *mon,
* qemuMonitorGetCpuHalted:
*
* Returns a bitmap of vcpu id's that are halted. The id's correspond to the
* 'CPU' field as reported by query-cpus[-fast]'.
* 'CPU' field as reported by query-cpus-fast'.
*/
virBitmap *
qemuMonitorGetCpuHalted(qemuMonitor *mon,
size_t maxvcpus,
bool fast)
size_t maxvcpus)
{
struct qemuMonitorQueryCpusEntry *cpuentries = NULL;
size_t ncpuentries = 0;
@ -1794,8 +1790,7 @@ qemuMonitorGetCpuHalted(qemuMonitor *mon,
QEMU_CHECK_MONITOR_NULL(mon);
rc = qemuMonitorJSONQueryCPUs(mon, &cpuentries, &ncpuentries, false,
fast);
rc = qemuMonitorJSONQueryCPUs(mon, &cpuentries, &ncpuentries, false);
if (rc < 0)
goto cleanup;

6
src/qemu/qemu_monitor.h
View File

@ -644,11 +644,9 @@ void qemuMonitorCPUInfoFree(qemuMonitorCPUInfo *list,
int qemuMonitorGetCPUInfo(qemuMonitor *mon,
qemuMonitorCPUInfo **vcpus,
size_t maxvcpus,
bool hotplug,
bool fast);
bool hotplug);
virBitmap *qemuMonitorGetCpuHalted(qemuMonitor *mon,
size_t maxvcpus,
bool fast);
size_t maxvcpus);
int qemuMonitorGetBalloonInfo(qemuMonitor *mon,
unsigned long long *currmem);

44
src/qemu/qemu_monitor_json.c
View File

@ -1678,21 +1678,8 @@ qemuMonitorJSONExtractCPUS390Info(virJSONValue *jsoncpu,
* @data: JSON response data
* @entries: filled with detected cpu entries on success
* @nentries: number of entries returned
* @fast: true if this is a response from query-cpus-fast
*
* The JSON response @data will have the following format
* in case @fast == false
* [{ "arch": "x86",
* "current": true,
* "CPU": 0,
* "qom_path": "/machine/unattached/device[0]",
* "pc": -2130415978,
* "halted": true,
* "thread_id": 2631237,
* ...},
* {...}
* ]
* and for @fast == true
* [{ "arch": "x86",
* "cpu-index": 0,
* "props": {
@ -1724,8 +1711,7 @@ qemuMonitorJSONExtractCPUS390Info(virJSONValue *jsoncpu,
static int
qemuMonitorJSONExtractCPUInfo(virJSONValue *data,
struct qemuMonitorQueryCpusEntry **entries,
size_t *nentries,
bool fast)
size_t *nentries)
{
const char *arch = NULL;
struct qemuMonitorQueryCpusEntry *cpus = NULL;
@ -1753,19 +1739,11 @@ qemuMonitorJSONExtractCPUInfo(virJSONValue *data,
* non-fatal, simply returning no data.
* The return data of query-cpus-fast has different field names
*/
if (fast) {
if (!(arch = virJSONValueObjectGetString(entry, "target")))
arch = virJSONValueObjectGetString(entry, "arch");
ignore_value(virJSONValueObjectGetNumberInt(entry, "cpu-index", &cpuid));
ignore_value(virJSONValueObjectGetNumberInt(entry, "thread-id", &thread));
qom_path = virJSONValueObjectGetString(entry, "qom-path");
} else {
if (!(arch = virJSONValueObjectGetString(entry, "target")))
arch = virJSONValueObjectGetString(entry, "arch");
ignore_value(virJSONValueObjectGetNumberInt(entry, "CPU", &cpuid));
ignore_value(virJSONValueObjectGetNumberInt(entry, "thread_id", &thread));
ignore_value(virJSONValueObjectGetBoolean(entry, "halted", &halted));
qom_path = virJSONValueObjectGetString(entry, "qom_path");
}
ignore_value(virJSONValueObjectGetNumberInt(entry, "cpu-index", &cpuid));
ignore_value(virJSONValueObjectGetNumberInt(entry, "thread-id", &thread));
qom_path = virJSONValueObjectGetString(entry, "qom-path");
cpus[i].qemu_id = cpuid;
cpus[i].tid = thread;
@ -1794,7 +1772,6 @@ qemuMonitorJSONExtractCPUInfo(virJSONValue *data,
* @entries: filled with detected entries on success
* @nentries: number of entries returned
* @force: force exit on error
* @fast: use query-cpus-fast
*
* Queries qemu for cpu-related information. Failure to execute the command or
* extract results does not produce an error as libvirt can continue without
@ -1807,18 +1784,13 @@ int
qemuMonitorJSONQueryCPUs(qemuMonitor *mon,
struct qemuMonitorQueryCpusEntry **entries,
size_t *nentries,
bool force,
bool fast)
bool force)
{
g_autoptr(virJSONValue) cmd = NULL;
g_autoptr(virJSONValue) reply = NULL;
virJSONValue *data;
if (fast)
cmd = qemuMonitorJSONMakeCommand("query-cpus-fast", NULL);
else
cmd = qemuMonitorJSONMakeCommand("query-cpus", NULL);
cmd = qemuMonitorJSONMakeCommand("query-cpus-fast", NULL);
if (!cmd)
return -1;
@ -1831,7 +1803,7 @@ qemuMonitorJSONQueryCPUs(qemuMonitor *mon,
if (!(data = virJSONValueObjectGetArray(reply, "return")))
return -2;
return qemuMonitorJSONExtractCPUInfo(data, entries, nentries, fast);
return qemuMonitorJSONExtractCPUInfo(data, entries, nentries);
}

3
src/qemu/qemu_monitor_json.h
View File

@ -66,8 +66,7 @@ int
qemuMonitorJSONQueryCPUs(qemuMonitor *mon,
struct qemuMonitorQueryCpusEntry **entries,
size_t *nentries,
bool force,
bool fast);
bool force);
int
qemuMonitorJSONUpdateVideoMemorySize(qemuMonitor *mon,
virDomainVideoDef *video,

4
tests/qemumonitorjsontest.c
View File

@ -1299,7 +1299,7 @@ testQEMUMonitorJSONqemuMonitorJSONQueryCPUsHelper(qemuMonitorTest *test,
int ret = -1;
if (qemuMonitorJSONQueryCPUs(qemuMonitorTestGetMonitor(test),
&cpudata, &ncpudata, true, true) < 0)
&cpudata, &ncpudata, true) < 0)
goto cleanup;
if (ncpudata != num) {
@ -2380,7 +2380,7 @@ testQemuMonitorCPUInfo(const void *opaque)
goto cleanup;
rc = qemuMonitorGetCPUInfo(qemuMonitorTestGetMonitor(test),
&vcpus, data->maxvcpus, true, true);
&vcpus, data->maxvcpus, true);
if (rc < 0)
goto cleanup;