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cpu_x86: Ignore enabled features for input models in x86DecodeUseCandidate
While we don't want to aim for the shortest list of disabled features in the baseline result (it would select a very old model), we want to do so while looking at any of the input models for which we're trying to compute a baseline CPU model. Given a set of input models, we always want to take the least capable one of them (i.e., the one with shortest list of disabled features) or a better model which is not one of the input models. So when considering an input model, we just check whether its list of disabled features is shorter than the currently best one. When looking at other models we check both enabled and disabled features while penalizing disabled features as implemented by the previous patch. Signed-off-by: Jiri Denemark <jdenemar@redhat.com> Reviewed-by: Michal Privoznik <mprivozn@redhat.com>
This commit is contained in:
Jiri Denemark
parent
48341b025a
commit
bb6cedd208
@ -1961,7 +1961,8 @@ virCPUx86Compare(virCPUDef *host,
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static int
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virCPUx86CompareCandidateFeatureList(virCPUDef *cpuCurrent,
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virCPUDef *cpuCandidate)
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virCPUDef *cpuCandidate,
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bool isPreferred)
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{
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size_t current = cpuCurrent->nfeatures;
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size_t enabledCurrent = current;
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@ -2003,6 +2004,14 @@ virCPUx86CompareCandidateFeatureList(virCPUDef *cpuCurrent,
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return 1;
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}
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if (isPreferred && disabled < disabledCurrent) {
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VIR_DEBUG("%s is in the list of preferred models and provides fewer "
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"disabled features than %s: %zu < %zu",
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cpuCandidate->model, cpuCurrent->model,
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disabled, disabledCurrent);
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return 1;
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}
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VIR_DEBUG("%s is not better than %s: %zu (%zu, %zu) >= %zu (%zu, %zu)",
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cpuCandidate->model, cpuCurrent->model,
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candidate, enabled, disabled,
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@ -2025,8 +2034,10 @@ x86DecodeUseCandidate(virCPUx86Model *current,
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virCPUx86Model *candidate,
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virCPUDef *cpuCandidate,
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uint32_t signature,
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const char *preferred)
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const char **preferred)
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{
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bool isPreferred = false;
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if (cpuCandidate->type == VIR_CPU_TYPE_HOST &&
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!candidate->decodeHost) {
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VIR_DEBUG("%s is not supposed to be used for host CPU definition",
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@ -2050,9 +2061,13 @@ x86DecodeUseCandidate(virCPUx86Model *current,
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}
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}
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if (preferred && STREQ(cpuCandidate->model, preferred)) {
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VIR_DEBUG("%s is the preferred model", cpuCandidate->model);
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return 2;
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if (preferred) {
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isPreferred = g_strv_contains(preferred, cpuCandidate->model);
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if (isPreferred && !preferred[1]) {
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VIR_DEBUG("%s is the preferred model", cpuCandidate->model);
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return 2;
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}
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}
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if (!cpuCurrent) {
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@ -2079,7 +2094,8 @@ x86DecodeUseCandidate(virCPUx86Model *current,
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}
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}
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return virCPUx86CompareCandidateFeatureList(cpuCurrent, cpuCandidate);
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return virCPUx86CompareCandidateFeatureList(cpuCurrent, cpuCandidate,
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isPreferred);
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}
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@ -2122,7 +2138,7 @@ static int
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x86Decode(virCPUDef *cpu,
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const virCPUx86Data *cpuData,
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virDomainCapsCPUModels *models,
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const char *preferred,
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const char **preferred,
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bool migratable)
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{
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virCPUx86Map *map;
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@ -2155,6 +2171,9 @@ x86Decode(virCPUDef *cpu,
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x86DataFilterTSX(&data, vendor, map);
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if (preferred && !preferred[0])
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preferred = NULL;
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/* Walk through the CPU models in reverse order to check newest
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* models first.
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*/
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@ -2162,16 +2181,18 @@ x86Decode(virCPUDef *cpu,
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candidate = map->models[i];
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if (models &&
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!(hvModel = virDomainCapsCPUModelsGet(models, candidate->name))) {
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if (preferred && STREQ(candidate->name, preferred)) {
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if (preferred &&
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!preferred[1] &&
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STREQ(candidate->name, preferred[0])) {
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if (cpu->fallback != VIR_CPU_FALLBACK_ALLOW) {
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virReportError(VIR_ERR_CONFIG_UNSUPPORTED,
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_("CPU model %s is not supported by hypervisor"),
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preferred);
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preferred[0]);
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return -1;
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} else {
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VIR_WARN("Preferred CPU model %s not allowed by"
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" hypervisor; closest supported model will be"
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" used", preferred);
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" used", preferred[0]);
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}
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} else {
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VIR_DEBUG("CPU model %s not allowed by hypervisor; ignoring",
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@ -2779,8 +2800,8 @@ virCPUx86Baseline(virCPUDef **cpus,
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size_t i;
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virCPUx86Vendor *vendor = NULL;
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bool outputVendor = true;
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const char *modelName;
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bool matchingNames = true;
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g_autofree char **modelNames = NULL;
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size_t namesLen = 0;
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g_autoptr(virCPUData) featData = NULL;
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if (!(map = virCPUx86GetMap()))
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@ -2802,19 +2823,17 @@ virCPUx86Baseline(virCPUDef **cpus,
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return NULL;
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}
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modelName = cpus[0]->model;
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modelNames = g_new0(char *, ncpus + 1);
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if (cpus[0]->model)
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modelNames[namesLen++] = cpus[0]->model;
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for (i = 1; i < ncpus; i++) {
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g_autoptr(virCPUx86Model) model = NULL;
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const char *vn = NULL;
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if (matchingNames && cpus[i]->model) {
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if (!modelName) {
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modelName = cpus[i]->model;
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} else if (STRNEQ(modelName, cpus[i]->model)) {
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modelName = NULL;
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matchingNames = false;
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}
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}
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if (cpus[i]->model &&
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!g_strv_contains((const char **) modelNames, cpus[i]->model))
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modelNames[namesLen++] = cpus[i]->model;
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if (!(model = x86ModelFromCPU(cpus[i], map, -1)))
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return NULL;
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@ -2877,10 +2896,11 @@ virCPUx86Baseline(virCPUDef **cpus,
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virCPUx86DataAddItem(&base_model->data, &vendor->data) < 0)
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return NULL;
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if (x86Decode(cpu, &base_model->data, models, modelName, migratable) < 0)
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if (x86Decode(cpu, &base_model->data, models,
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(const char **) modelNames, migratable) < 0)
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return NULL;
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if (STREQ_NULLABLE(cpu->model, modelName))
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if (namesLen == 1 && STREQ(cpu->model, modelNames[0]))
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cpu->fallback = VIR_CPU_FALLBACK_FORBID;
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if (!outputVendor)
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@ -1,10 +1,14 @@
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<cpu mode='custom' match='exact'>
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<model fallback='allow'>SandyBridge</model>
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<model fallback='allow'>Westmere</model>
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<vendor>Intel</vendor>
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<feature policy='require' name='vme'/>
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<feature policy='require' name='ss'/>
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<feature policy='require' name='pclmuldq'/>
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<feature policy='require' name='pcid'/>
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<feature policy='require' name='x2apic'/>
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<feature policy='require' name='tsc-deadline'/>
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<feature policy='require' name='xsave'/>
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<feature policy='require' name='osxsave'/>
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<feature policy='require' name='avx'/>
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<feature policy='require' name='hypervisor'/>
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<feature policy='disable' name='rdtscp'/>
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</cpu>
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@ -1,11 +1,15 @@
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<cpu mode='custom' match='exact'>
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<model fallback='allow'>SandyBridge</model>
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<model fallback='allow'>Westmere</model>
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<vendor>Intel</vendor>
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<feature policy='require' name='vme'/>
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<feature policy='require' name='ss'/>
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<feature policy='require' name='pclmuldq'/>
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<feature policy='require' name='pcid'/>
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<feature policy='require' name='x2apic'/>
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<feature policy='require' name='tsc-deadline'/>
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<feature policy='require' name='xsave'/>
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<feature policy='require' name='osxsave'/>
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<feature policy='require' name='avx'/>
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<feature policy='require' name='hypervisor'/>
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<feature policy='require' name='invtsc'/>
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<feature policy='disable' name='rdtscp'/>
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</cpu>
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@ -1,17 +1,22 @@
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<cpu mode='custom' match='exact'>
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<model fallback='allow'>Cooperlake</model>
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<model fallback='allow'>Cascadelake-Server</model>
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<vendor>Intel</vendor>
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<feature policy='require' name='ss'/>
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<feature policy='require' name='vmx'/>
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<feature policy='require' name='hypervisor'/>
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<feature policy='require' name='tsc_adjust'/>
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<feature policy='require' name='mpx'/>
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<feature policy='require' name='umip'/>
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<feature policy='require' name='pku'/>
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<feature policy='require' name='md-clear'/>
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<feature policy='require' name='stibp'/>
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<feature policy='require' name='arch-capabilities'/>
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<feature policy='require' name='xsaves'/>
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<feature policy='require' name='ibpb'/>
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<feature policy='require' name='amd-ssbd'/>
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<feature policy='require' name='rdctl-no'/>
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<feature policy='require' name='ibrs-all'/>
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<feature policy='require' name='skip-l1dfl-vmentry'/>
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<feature policy='require' name='mds-no'/>
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<feature policy='require' name='pschange-mc-no'/>
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<feature policy='require' name='tsx-ctrl'/>
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<feature policy='disable' name='avx512-bf16'/>
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<feature policy='disable' name='taa-no'/>
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</cpu>
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