s390x/kvm: implement CPU model support
Let's implement our two hooks so we can support CPU models. Acked-by: Cornelia Huck <cornelia.huck@de.ibm.com> Signed-off-by: David Hildenbrand <dahi@linux.vnet.ibm.com> Message-Id: <20160905085244.99980-22-dahi@linux.vnet.ibm.com> Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com>
This commit is contained in:
David Hildenbrand
Cornelia Huck
parent
392529cb77
commit
3b84c25cc7
@ -162,6 +162,61 @@ bool s390_has_feat(S390Feat feat)
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return test_bit(feat, cpu->model->features);
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}
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uint8_t s390_get_gen_for_cpu_type(uint16_t type)
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{
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int i;
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for (i = 0; i < ARRAY_SIZE(s390_cpu_defs); i++) {
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if (s390_cpu_defs[i].type == type) {
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return s390_cpu_defs[i].gen;
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}
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}
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return 0;
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}
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const S390CPUDef *s390_find_cpu_def(uint16_t type, uint8_t gen, uint8_t ec_ga,
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S390FeatBitmap features)
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{
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const S390CPUDef *last_compatible = NULL;
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int i;
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if (!gen) {
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ec_ga = 0;
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}
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if (!gen && type) {
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gen = s390_get_gen_for_cpu_type(type);
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}
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for (i = 0; i < ARRAY_SIZE(s390_cpu_defs); i++) {
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const S390CPUDef *def = &s390_cpu_defs[i];
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S390FeatBitmap missing;
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/* don't even try newer generations if we know the generation */
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if (gen) {
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if (def->gen > gen) {
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break;
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} else if (def->gen == gen && ec_ga && def->ec_ga > ec_ga) {
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break;
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}
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}
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if (features) {
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/* see if the model satisfies the minimum features */
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bitmap_andnot(missing, def->base_feat, features, S390_FEAT_MAX);
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if (!bitmap_empty(missing, S390_FEAT_MAX)) {
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break;
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}
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}
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/* stop the search if we found the exact model */
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if (def->type == type && def->ec_ga == ec_ga) {
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return def;
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}
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last_compatible = def;
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}
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return last_compatible;
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}
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struct S390PrintCpuListInfo {
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FILE *f;
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fprintf_function print;
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@ -324,7 +379,7 @@ static S390CPUModel *get_max_cpu_model(Error **errp)
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}
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if (kvm_enabled()) {
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error_setg(errp, "KVM does not support CPU models.");
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kvm_s390_get_host_cpu_model(&max_model, errp);
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} else {
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/* TCG enulates a z900 */
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max_model.def = &s390_cpu_defs[0];
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@ -357,8 +412,7 @@ static inline void apply_cpu_model(const S390CPUModel *model, Error **errp)
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}
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if (kvm_enabled()) {
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/* FIXME KVM */
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error_setg(errp, "KVM doesn't support CPU models.");
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kvm_s390_apply_cpu_model(model, errp);
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} else if (model) {
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/* FIXME TCG - use data for stdip/stfl */
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}
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@ -563,6 +617,21 @@ static void s390_cpu_model_initfn(Object *obj)
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#ifdef CONFIG_KVM
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static void s390_host_cpu_model_initfn(Object *obj)
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{
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S390CPU *cpu = S390_CPU(obj);
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Error *err = NULL;
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if (!kvm_enabled() || !kvm_s390_cpu_models_supported()) {
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return;
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}
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cpu->model = g_malloc0(sizeof(*cpu->model));
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kvm_s390_get_host_cpu_model(cpu->model, &err);
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if (err) {
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error_report_err(err);
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g_free(cpu->model);
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/* fallback to unsupported cpu models */
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cpu->model = NULL;
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}
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}
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#endif
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@ -49,7 +49,25 @@ typedef struct S390CPUModel {
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uint8_t cpu_ver; /* CPU version, usually "ff" for kvm */
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} S390CPUModel;
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/*
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* CPU ID
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*
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* bits 0-7: Zeroes (ff for kvm)
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* bits 8-31: CPU ID (serial number)
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* bits 32-48: Machine type
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* bits 48-63: Zeroes
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*/
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#define cpuid_type(x) (((x) >> 16) & 0xffff)
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#define cpuid_id(x) (((x) >> 32) & 0xffffff)
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#define cpuid_ver(x) (((x) >> 56) & 0xff)
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#define lowest_ibc(x) (((uint32_t)(x) >> 16) & 0xfff)
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#define unblocked_ibc(x) ((uint32_t)(x) & 0xfff)
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#define has_ibc(x) (lowest_ibc(x) != 0)
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#define S390_GEN_Z10 0xa
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#define ibc_gen(x) (x == 0 ? 0 : ((x >> 4) + S390_GEN_Z10))
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#define ibc_ec_ga(x) (x & 0xf)
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uint32_t s390_get_hmfai(void);
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uint8_t s390_get_mha_pow(void);
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@ -65,5 +83,37 @@ static inline uint16_t s390_ibc_from_cpu_model(const S390CPUModel *model)
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}
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void s390_get_feat_block(S390FeatType type, uint8_t *data);
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bool s390_has_feat(S390Feat feat);
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uint8_t s390_get_gen_for_cpu_type(uint16_t type);
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static inline bool s390_known_cpu_type(uint16_t type)
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{
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return s390_get_gen_for_cpu_type(type) != 0;
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}
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static inline uint64_t s390_cpuid_from_cpu_model(const S390CPUModel *model)
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{
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return ((uint64_t)model->cpu_ver << 56) |
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((uint64_t)model->cpu_id << 32) |
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((uint64_t)model->def->type << 16);
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}
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S390CPUDef const *s390_find_cpu_def(uint16_t type, uint8_t gen, uint8_t ec_ga,
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S390FeatBitmap features);
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#ifdef CONFIG_KVM
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bool kvm_s390_cpu_models_supported(void);
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void kvm_s390_get_host_cpu_model(S390CPUModel *model, Error **errp);
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void kvm_s390_apply_cpu_model(const S390CPUModel *model, Error **errp);
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#else
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static inline void kvm_s390_get_host_cpu_model(S390CPUModel *model,
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Error **errp)
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{
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}
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static inline void kvm_s390_apply_cpu_model(const S390CPUModel *model,
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Error **errp)
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{
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}
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static inline bool kvm_s390_cpu_models_supported(void)
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{
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return false;
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}
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#endif
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#endif /* TARGET_S390X_CPU_MODELS_H */
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@ -2312,3 +2312,298 @@ int kvm_arch_msi_data_to_gsi(uint32_t data)
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{
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abort();
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}
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static inline int test_bit_inv(long nr, const unsigned long *addr)
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{
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return test_bit(BE_BIT_NR(nr), addr);
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}
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static inline void set_bit_inv(long nr, unsigned long *addr)
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{
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set_bit(BE_BIT_NR(nr), addr);
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}
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static int query_cpu_subfunc(S390FeatBitmap features)
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{
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struct kvm_s390_vm_cpu_subfunc prop;
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struct kvm_device_attr attr = {
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.group = KVM_S390_VM_CPU_MODEL,
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.attr = KVM_S390_VM_CPU_MACHINE_SUBFUNC,
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.addr = (uint64_t) &prop,
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};
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int rc;
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rc = kvm_vm_ioctl(kvm_state, KVM_GET_DEVICE_ATTR, &attr);
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if (rc) {
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return rc;
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}
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/*
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* We're going to add all subfunctions now, if the corresponding feature
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* is available that unlocks the query functions.
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*/
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s390_add_from_feat_block(features, S390_FEAT_TYPE_PLO, prop.plo);
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if (test_bit(S390_FEAT_TOD_CLOCK_STEERING, features)) {
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s390_add_from_feat_block(features, S390_FEAT_TYPE_PTFF, prop.ptff);
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}
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if (test_bit(S390_FEAT_MSA, features)) {
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s390_add_from_feat_block(features, S390_FEAT_TYPE_KMAC, prop.kmac);
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s390_add_from_feat_block(features, S390_FEAT_TYPE_KMC, prop.kmc);
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s390_add_from_feat_block(features, S390_FEAT_TYPE_KM, prop.km);
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s390_add_from_feat_block(features, S390_FEAT_TYPE_KIMD, prop.kimd);
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s390_add_from_feat_block(features, S390_FEAT_TYPE_KLMD, prop.klmd);
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}
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if (test_bit(S390_FEAT_MSA_EXT_3, features)) {
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s390_add_from_feat_block(features, S390_FEAT_TYPE_PCKMO, prop.pckmo);
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}
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if (test_bit(S390_FEAT_MSA_EXT_4, features)) {
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s390_add_from_feat_block(features, S390_FEAT_TYPE_KMCTR, prop.kmctr);
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s390_add_from_feat_block(features, S390_FEAT_TYPE_KMF, prop.kmf);
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s390_add_from_feat_block(features, S390_FEAT_TYPE_KMO, prop.kmo);
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s390_add_from_feat_block(features, S390_FEAT_TYPE_PCC, prop.pcc);
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}
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if (test_bit(S390_FEAT_MSA_EXT_5, features)) {
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s390_add_from_feat_block(features, S390_FEAT_TYPE_PPNO, prop.ppno);
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}
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return 0;
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}
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static int configure_cpu_subfunc(const S390FeatBitmap features)
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{
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struct kvm_s390_vm_cpu_subfunc prop = {};
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struct kvm_device_attr attr = {
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.group = KVM_S390_VM_CPU_MODEL,
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.attr = KVM_S390_VM_CPU_PROCESSOR_SUBFUNC,
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.addr = (uint64_t) &prop,
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};
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if (!kvm_vm_check_attr(kvm_state, KVM_S390_VM_CPU_MODEL,
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KVM_S390_VM_CPU_PROCESSOR_SUBFUNC)) {
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/* hardware support might be missing, IBC will handle most of this */
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return 0;
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}
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s390_fill_feat_block(features, S390_FEAT_TYPE_PLO, prop.plo);
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if (test_bit(S390_FEAT_TOD_CLOCK_STEERING, features)) {
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s390_fill_feat_block(features, S390_FEAT_TYPE_PTFF, prop.ptff);
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prop.ptff[0] |= 0x80; /* query is always available */
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}
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if (test_bit(S390_FEAT_MSA, features)) {
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s390_fill_feat_block(features, S390_FEAT_TYPE_KMAC, prop.kmac);
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prop.kmac[0] |= 0x80; /* query is always available */
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s390_fill_feat_block(features, S390_FEAT_TYPE_KMC, prop.kmc);
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prop.kmc[0] |= 0x80; /* query is always available */
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s390_fill_feat_block(features, S390_FEAT_TYPE_KM, prop.km);
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prop.km[0] |= 0x80; /* query is always available */
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s390_fill_feat_block(features, S390_FEAT_TYPE_KIMD, prop.kimd);
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prop.kimd[0] |= 0x80; /* query is always available */
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s390_fill_feat_block(features, S390_FEAT_TYPE_KLMD, prop.klmd);
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prop.klmd[0] |= 0x80; /* query is always available */
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}
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if (test_bit(S390_FEAT_MSA_EXT_3, features)) {
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s390_fill_feat_block(features, S390_FEAT_TYPE_PCKMO, prop.pckmo);
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prop.pckmo[0] |= 0x80; /* query is always available */
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}
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if (test_bit(S390_FEAT_MSA_EXT_4, features)) {
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s390_fill_feat_block(features, S390_FEAT_TYPE_KMCTR, prop.kmctr);
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prop.kmctr[0] |= 0x80; /* query is always available */
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s390_fill_feat_block(features, S390_FEAT_TYPE_KMF, prop.kmf);
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prop.kmf[0] |= 0x80; /* query is always available */
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s390_fill_feat_block(features, S390_FEAT_TYPE_KMO, prop.kmo);
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prop.kmo[0] |= 0x80; /* query is always available */
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s390_fill_feat_block(features, S390_FEAT_TYPE_PCC, prop.pcc);
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prop.pcc[0] |= 0x80; /* query is always available */
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}
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if (test_bit(S390_FEAT_MSA_EXT_5, features)) {
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s390_fill_feat_block(features, S390_FEAT_TYPE_PPNO, prop.ppno);
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prop.ppno[0] |= 0x80; /* query is always available */
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}
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return kvm_vm_ioctl(kvm_state, KVM_SET_DEVICE_ATTR, &attr);
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}
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static int kvm_to_feat[][2] = {
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{ KVM_S390_VM_CPU_FEAT_ESOP, S390_FEAT_ESOP },
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{ KVM_S390_VM_CPU_FEAT_SIEF2, S390_FEAT_SIE_F2 },
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{ KVM_S390_VM_CPU_FEAT_64BSCAO , S390_FEAT_SIE_64BSCAO },
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{ KVM_S390_VM_CPU_FEAT_SIIF, S390_FEAT_SIE_SIIF },
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{ KVM_S390_VM_CPU_FEAT_GPERE, S390_FEAT_SIE_GPERE },
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{ KVM_S390_VM_CPU_FEAT_GSLS, S390_FEAT_SIE_GSLS },
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{ KVM_S390_VM_CPU_FEAT_IB, S390_FEAT_SIE_IB },
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{ KVM_S390_VM_CPU_FEAT_CEI, S390_FEAT_SIE_CEI },
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{ KVM_S390_VM_CPU_FEAT_IBS, S390_FEAT_SIE_IBS },
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{ KVM_S390_VM_CPU_FEAT_SKEY, S390_FEAT_SIE_SKEY },
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{ KVM_S390_VM_CPU_FEAT_CMMA, S390_FEAT_SIE_CMMA },
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{ KVM_S390_VM_CPU_FEAT_PFMFI, S390_FEAT_SIE_PFMFI},
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{ KVM_S390_VM_CPU_FEAT_SIGPIF, S390_FEAT_SIE_SIGPIF},
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};
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static int query_cpu_feat(S390FeatBitmap features)
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{
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struct kvm_s390_vm_cpu_feat prop;
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struct kvm_device_attr attr = {
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.group = KVM_S390_VM_CPU_MODEL,
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.attr = KVM_S390_VM_CPU_MACHINE_FEAT,
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.addr = (uint64_t) &prop,
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};
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int rc;
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int i;
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rc = kvm_vm_ioctl(kvm_state, KVM_GET_DEVICE_ATTR, &attr);
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if (rc) {
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return rc;
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}
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for (i = 0; i < ARRAY_SIZE(kvm_to_feat); i++) {
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if (test_bit_inv(kvm_to_feat[i][0], (unsigned long *)prop.feat)) {
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set_bit(kvm_to_feat[i][1], features);
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}
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}
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return 0;
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}
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static int configure_cpu_feat(const S390FeatBitmap features)
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{
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struct kvm_s390_vm_cpu_feat prop = {};
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struct kvm_device_attr attr = {
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.group = KVM_S390_VM_CPU_MODEL,
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.attr = KVM_S390_VM_CPU_PROCESSOR_FEAT,
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.addr = (uint64_t) &prop,
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};
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int i;
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for (i = 0; i < ARRAY_SIZE(kvm_to_feat); i++) {
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if (test_bit(kvm_to_feat[i][1], features)) {
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set_bit_inv(kvm_to_feat[i][0], (unsigned long *)prop.feat);
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}
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}
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return kvm_vm_ioctl(kvm_state, KVM_SET_DEVICE_ATTR, &attr);
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}
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bool kvm_s390_cpu_models_supported(void)
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{
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return kvm_vm_check_attr(kvm_state, KVM_S390_VM_CPU_MODEL,
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KVM_S390_VM_CPU_MACHINE) &&
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kvm_vm_check_attr(kvm_state, KVM_S390_VM_CPU_MODEL,
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KVM_S390_VM_CPU_PROCESSOR) &&
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kvm_vm_check_attr(kvm_state, KVM_S390_VM_CPU_MODEL,
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KVM_S390_VM_CPU_MACHINE_FEAT) &&
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kvm_vm_check_attr(kvm_state, KVM_S390_VM_CPU_MODEL,
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KVM_S390_VM_CPU_PROCESSOR_FEAT) &&
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kvm_vm_check_attr(kvm_state, KVM_S390_VM_CPU_MODEL,
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KVM_S390_VM_CPU_MACHINE_SUBFUNC);
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}
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void kvm_s390_get_host_cpu_model(S390CPUModel *model, Error **errp)
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{
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struct kvm_s390_vm_cpu_machine prop = {};
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struct kvm_device_attr attr = {
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.group = KVM_S390_VM_CPU_MODEL,
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.attr = KVM_S390_VM_CPU_MACHINE,
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.addr = (uint64_t) &prop,
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};
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uint16_t unblocked_ibc = 0, cpu_type = 0;
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int rc;
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memset(model, 0, sizeof(*model));
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if (!kvm_s390_cpu_models_supported()) {
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error_setg(errp, "KVM doesn't support CPU models");
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return;
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}
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/* query the basic cpu model properties */
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rc = kvm_vm_ioctl(kvm_state, KVM_GET_DEVICE_ATTR, &attr);
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if (rc) {
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error_setg(errp, "KVM: Error querying host CPU model: %d", rc);
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return;
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}
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cpu_type = cpuid_type(prop.cpuid);
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if (has_ibc(prop.ibc)) {
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model->lowest_ibc = lowest_ibc(prop.ibc);
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unblocked_ibc = unblocked_ibc(prop.ibc);
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}
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model->cpu_id = cpuid_id(prop.cpuid);
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model->cpu_ver = 0xff;
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/* get supported cpu features indicated via STFL(E) */
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s390_add_from_feat_block(model->features, S390_FEAT_TYPE_STFL,
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||||
(uint8_t *) prop.fac_mask);
|
||||
/* dat-enhancement facility 2 has no bit but was introduced with stfle */
|
||||
if (test_bit(S390_FEAT_STFLE, model->features)) {
|
||||
set_bit(S390_FEAT_DAT_ENH_2, model->features);
|
||||
}
|
||||
/* get supported cpu features indicated e.g. via SCLP */
|
||||
rc = query_cpu_feat(model->features);
|
||||
if (rc) {
|
||||
error_setg(errp, "KVM: Error querying CPU features: %d", rc);
|
||||
return;
|
||||
}
|
||||
/* get supported cpu subfunctions indicated via query / test bit */
|
||||
rc = query_cpu_subfunc(model->features);
|
||||
if (rc) {
|
||||
error_setg(errp, "KVM: Error querying CPU subfunctions: %d", rc);
|
||||
return;
|
||||
}
|
||||
|
||||
if (s390_known_cpu_type(cpu_type)) {
|
||||
/* we want the exact model, even if some features are missing */
|
||||
model->def = s390_find_cpu_def(cpu_type, ibc_gen(unblocked_ibc),
|
||||
ibc_ec_ga(unblocked_ibc), NULL);
|
||||
} else {
|
||||
/* model unknown, e.g. too new - search using features */
|
||||
model->def = s390_find_cpu_def(0, ibc_gen(unblocked_ibc),
|
||||
ibc_ec_ga(unblocked_ibc),
|
||||
model->features);
|
||||
}
|
||||
if (!model->def) {
|
||||
error_setg(errp, "KVM: host CPU model could not be identified");
|
||||
return;
|
||||
}
|
||||
/* strip of features that are not part of the maximum model */
|
||||
bitmap_and(model->features, model->features, model->def->full_feat,
|
||||
S390_FEAT_MAX);
|
||||
}
|
||||
|
||||
void kvm_s390_apply_cpu_model(const S390CPUModel *model, Error **errp)
|
||||
{
|
||||
struct kvm_s390_vm_cpu_processor prop = {
|
||||
.fac_list = { 0 },
|
||||
};
|
||||
struct kvm_device_attr attr = {
|
||||
.group = KVM_S390_VM_CPU_MODEL,
|
||||
.attr = KVM_S390_VM_CPU_PROCESSOR,
|
||||
.addr = (uint64_t) &prop,
|
||||
};
|
||||
int rc;
|
||||
|
||||
if (!model) {
|
||||
return;
|
||||
}
|
||||
if (!kvm_s390_cpu_models_supported()) {
|
||||
error_setg(errp, "KVM doesn't support CPU models");
|
||||
return;
|
||||
}
|
||||
prop.cpuid = s390_cpuid_from_cpu_model(model);
|
||||
prop.ibc = s390_ibc_from_cpu_model(model);
|
||||
/* configure cpu features indicated via STFL(e) */
|
||||
s390_fill_feat_block(model->features, S390_FEAT_TYPE_STFL,
|
||||
(uint8_t *) prop.fac_list);
|
||||
rc = kvm_vm_ioctl(kvm_state, KVM_SET_DEVICE_ATTR, &attr);
|
||||
if (rc) {
|
||||
error_setg(errp, "KVM: Error configuring the CPU model: %d", rc);
|
||||
return;
|
||||
}
|
||||
/* configure cpu features indicated e.g. via SCLP */
|
||||
rc = configure_cpu_feat(model->features);
|
||||
if (rc) {
|
||||
error_setg(errp, "KVM: Error configuring CPU features: %d", rc);
|
||||
return;
|
||||
}
|
||||
/* configure cpu subfunctions indicated via query / test bit */
|
||||
rc = configure_cpu_subfunc(model->features);
|
||||
if (rc) {
|
||||
error_setg(errp, "KVM: Error configuring CPU subfunctions: %d", rc);
|
||||
return;
|
||||
}
|
||||
}
|
||||
|
||||
Loading…
x
Reference in New Issue
Block a user