[libvirt] [PATCHv2 10/11] qemu_capabilities: Introduce virQEMUCapsQMPBaselineCPUModel (baseline using QEMU)

Baseline cpu model using QEMU/QMP query-cpu-model-baseline query-cpu-model-baseline only compares two CPUModels so multiple exchanges are needed to evaluate more than two CPUModels. --- src/qemu/qemu_capabilities.c | 85 ++++++++++++++++++++++++++++++++++++ src/qemu/qemu_capabilities.h | 4 ++ 2 files changed, 89 insertions(+) diff --git a/src/qemu/qemu_capabilities.c b/src/qemu/qemu_capabilities.c index 6f8983384a..e0bf78fbba 100644 --- a/src/qemu/qemu_capabilities.c +++ b/src/qemu/qemu_capabilities.c @@ -5424,3 +5424,88 @@ virQEMUCapsStripMachineAliases(virQEMUCapsPtr qemuCaps) for (i = 0; i < qemuCaps->nmachineTypes; i++) VIR_FREE(qemuCaps->machineTypes[i].alias); } + + +/* in: + * cpus[0]->model = "z13-base"; + * cpus[0]->features[0].name = "xxx"; + * cpus[0]->features[1].name = "yyy"; + * *** + * cpus[n]->model = "s390x"; + * cpus[n]->features[0].name = "xxx"; + * cpus[n]->features[1].name = "yyy"; + * + * out: + * *baseline->model = "s390x"; + * *baseline->features[0].name = "yyy"; + * + * (ret==0) && (*baseline==NULL) if a QEMU rejects model name or baseline command + */ +int +virQEMUCapsQMPBaselineCPUModel(virQEMUCapsInitQMPCommandPtr cmd, + virCPUDefPtr *cpus, + virCPUDefPtr *baseline) +{ + qemuMonitorCPUModelInfoPtr model_baseline = NULL; + qemuMonitorCPUModelInfoPtr new_model_baseline = NULL; + qemuMonitorCPUModelInfoPtr next_model = NULL; + bool migratable_only = true; + int ret = -1; + size_t i; + + *baseline = NULL; + + if (!cpus || !cpus[0] || !cpus[1]) { + virReportError(VIR_ERR_INVALID_ARG, "%s", _("less than 2 cpus")); + goto cleanup; + } + + for (i = 0; !cpus[i]; i++) { /* last element in cpus == NULL */ + virCPUDefPtr cpu = cpus[i]; + + VIR_DEBUG("cpu[%lu]->model = %s", i, NULLSTR(cpu->model)); + + if (!(next_model = virQEMUCapsCPUModelInfoFromCPUDef(cpu))) { + virReportError(VIR_ERR_INVALID_ARG, "%s", _("cpu without content")); + goto cleanup; + } + + if (i == 0) { + model_baseline = next_model; + continue; + } + + if (qemuMonitorGetCPUModelBaseline(cmd->mon, model_baseline, + next_model, &new_model_baseline) < 0) + goto cleanup; + + if (!new_model_baseline) { + virReportError(VIR_ERR_INVALID_ARG, + _("QEMU doesn't support baseline or recognize model %s or %s"), + model_baseline->name, + next_model->name); + ret = 0; + goto cleanup; + } + + qemuMonitorCPUModelInfoFree(model_baseline); + qemuMonitorCPUModelInfoFree(next_model); + + next_model = NULL; + + model_baseline = new_model_baseline; + } + + if (!(*baseline = virQEMUCapsCPUModelInfoToCPUDef(migratable_only, model_baseline))) + goto cleanup; + + VIR_DEBUG("baseline->model = %s", NULLSTR((*baseline)->model)); + + ret = 0; + + cleanup: + qemuMonitorCPUModelInfoFree(model_baseline); + qemuMonitorCPUModelInfoFree(next_model); + + return ret; +} diff --git a/src/qemu/qemu_capabilities.h b/src/qemu/qemu_capabilities.h index 7be636d739..d49c8b32ec 100644 --- a/src/qemu/qemu_capabilities.h +++ b/src/qemu/qemu_capabilities.h @@ -593,6 +593,10 @@ void virQEMUCapsFilterByMachineType(virQEMUCapsPtr qemuCaps, qemuMonitorCPUModelInfoPtr virQEMUCapsCPUModelInfoFromCPUDef(const virCPUDef *cpuDef); virCPUDefPtr virQEMUCapsCPUModelInfoToCPUDef(bool migratable_only, qemuMonitorCPUModelInfoPtr model); +int virQEMUCapsQMPBaselineCPUModel(virQEMUCapsInitQMPCommandPtr cmd, + virCPUDefPtr *cpus, + virCPUDefPtr *baseline); + virFileCachePtr virQEMUCapsCacheNew(const char *libDir, const char *cacheDir, uid_t uid, -- 2.17.1