Re: [libvirt] [PATCHv1 4/7] qemu_capabilities: Baseline CPUModel via QEMU

Spinup QEMU instance and complete QMP query-cpu-model-baseline exchanges to determine CPUModel 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 | 132 +++++++++++++++++++++++++++++++++++++++++++ src/qemu/qemu_capabilities.h | 9 +++ 2 files changed, 141 insertions(+) diff --git a/src/qemu/qemu_capabilities.c b/src/qemu/qemu_capabilities.c index 097985cbe7..9ffbf91a90 100644 --- a/src/qemu/qemu_capabilities.c +++ b/src/qemu/qemu_capabilities.c @@ -5122,3 +5122,135 @@ virQEMUCapsSetMicrocodeVersion(virQEMUCapsPtr qemuCaps, { qemuCaps->microcodeVersion = microcodeVersion; } + + +/* in: + * <host> + * <cpu> + * <arch>s390x</arch> + * <model>z13-base</model> + * <feature name='xxx'/> + * ... + * <feature name='yyy'/> + * </cpu> + * <cpu> + * <arch>s390x</arch> + * <model>z114-base</model> + * <feature name='xxx'/> + * ... + * <feature name='yyy'/> + * </cpu> + * </host> + * + * out: + * <cpu match='exact'> + * <model>z13-base</model> + * <feature policy='require' name='xxx'/> + * <feature policy='require' name='yyy'/> + * </cpu> + * + * (ret==0) && (baseline.len == 0) if baseline not supported by QEMU + */ +int +virQEMUCapsQMPBaselineCPUModel(char *exec, + const char *libDir, + uid_t runUid, + gid_t runGid, + const char **xmlCPUs, + unsigned int ncpus, + bool migratable, + virBufferPtr baseline) +{ + qemuMonitorCPUModelInfoPtr model_baseline = NULL; + qemuMonitorCPUModelInfoPtr new_model_baseline = NULL; + qemuMonitorCPUModelInfoPtr model_b = NULL; + virQEMUCapsInitQMPCommandPtr cmd = NULL; + virBuffer buf = VIR_BUFFER_INITIALIZER; + bool forceTCG = false; + int ret = -1; + size_t i; + + VIR_DEBUG("ncpus=%i, migratable=%i", ncpus, migratable); + + if (!(cmd = virQEMUCapsSpinUpQemu(exec, libDir, runUid, runGid, forceTCG))) + goto cleanup; + + if (!(cmd->mon)) {

+ /* Not connected to QEMU (monitor) */ + VIR_DEBUG("QEMU failed to initialize error=%s", virGetLastErrorMessage()); + goto cleanup; + } + + /* QEMU requires qmp_capabilities exchange first */ + if (qemuMonitorSetCapabilities(cmd->mon) < 0) { + VIR_DEBUG("Failed to set monitor capabilities %s", + virGetLastErrorMessage()); + goto cleanup; + }