| Message ID | 20100113132506.GY7549@redhat.com |
|---|---|
| State | New |
| Headers | show |
On 01/13/2010 07:25 AM, Gleb Natapov wrote: > Initialize KVM paravirt cpuid leaf and allow user to control guest > visible PV features through -cpu flag. > > Signed-off-by: Gleb Natapov<gleb@redhat.com> > --- > v1->v2 > fix indentation > remove unneeded ifdefs > v2->v3 > added needed ifdefs (CONFIG_KVM_PARA) > > diff --git a/target-i386/cpu.h b/target-i386/cpu.h > index f3834b3..216b00e 100644 > --- a/target-i386/cpu.h > +++ b/target-i386/cpu.h > @@ -701,7 +701,8 @@ typedef struct CPUX86State { > uint8_t nmi_pending; > uint8_t has_error_code; > uint32_t sipi_vector; > - > + uint32_t cpuid_kvm_features; > + > /* in order to simplify APIC support, we leave this pointer to the > user */ > struct APICState *apic_state; > diff --git a/target-i386/helper.c b/target-i386/helper.c > index 049fccf..70762bb 100644 > --- a/target-i386/helper.c > +++ b/target-i386/helper.c > @@ -58,10 +58,18 @@ static const char *ext3_feature_name[] = { > NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, > }; > > +static const char *kvm_feature_name[] = { > + "kvmclock", "kvm_nopiodelay", "kvm_mmu", NULL, NULL, NULL, NULL, NULL, > + NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, > + NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, > + NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, > +}; > + > static void add_flagname_to_bitmaps(const char *flagname, uint32_t *features, > uint32_t *ext_features, > uint32_t *ext2_features, > - uint32_t *ext3_features) > + uint32_t *ext3_features, > + uint32_t *kvm_features) > { > int i; > int found = 0; > @@ -86,6 +94,12 @@ static void add_flagname_to_bitmaps(const char *flagname, uint32_t *features, > *ext3_features |= 1<< i; > found = 1; > } > + for ( i = 0 ; i< 32 ; i++ ) > + if (kvm_feature_name[i]&& !strcmp (flagname, kvm_feature_name[i])) { > + *kvm_features |= 1<< i; > + found = 1; > + } > + > if (!found) { > fprintf(stderr, "CPU feature %s not found\n", flagname); > } > @@ -98,7 +112,7 @@ typedef struct x86_def_t { > int family; > int model; > int stepping; > - uint32_t features, ext_features, ext2_features, ext3_features; > + uint32_t features, ext_features, ext2_features, ext3_features, kvm_features; > uint32_t xlevel; > char model_id[48]; > int vendor_override; > @@ -375,8 +389,8 @@ static int cpu_x86_find_by_name(x86_def_t *x86_cpu_def, const char *cpu_model) > > char *s = strdup(cpu_model); > char *featurestr, *name = strtok(s, ","); > - uint32_t plus_features = 0, plus_ext_features = 0, plus_ext2_features = 0, plus_ext3_features = 0; > - uint32_t minus_features = 0, minus_ext_features = 0, minus_ext2_features = 0, minus_ext3_features = 0; > + uint32_t plus_features = 0, plus_ext_features = 0, plus_ext2_features = 0, plus_ext3_features = 0, plus_kvm_features = 0; > + uint32_t minus_features = 0, minus_ext_features = 0, minus_ext2_features = 0, minus_ext3_features = 0, minus_kvm_features = 0; > uint32_t numvalue; > > def = NULL; > @@ -394,17 +408,20 @@ static int cpu_x86_find_by_name(x86_def_t *x86_cpu_def, const char *cpu_model) > memcpy(x86_cpu_def, def, sizeof(*def)); > } > > + plus_kvm_features = ~0; /* not supported bits will be filtered out later */ > + > add_flagname_to_bitmaps("hypervisor",&plus_features, > -&plus_ext_features,&plus_ext2_features,&plus_ext3_features); > +&plus_ext_features,&plus_ext2_features,&plus_ext3_features, > +&plus_kvm_features); > > featurestr = strtok(NULL, ","); > > while (featurestr) { > char *val; > if (featurestr[0] == '+') { > - add_flagname_to_bitmaps(featurestr + 1,&plus_features,&plus_ext_features,&plus_ext2_features,&plus_ext3_features); > + add_flagname_to_bitmaps(featurestr + 1,&plus_features,&plus_ext_features,&plus_ext2_features,&plus_ext3_features,&plus_kvm_features); > } else if (featurestr[0] == '-') { > - add_flagname_to_bitmaps(featurestr + 1,&minus_features,&minus_ext_features,&minus_ext2_features,&minus_ext3_features); > + add_flagname_to_bitmaps(featurestr + 1,&minus_features,&minus_ext_features,&minus_ext2_features,&minus_ext3_features,&minus_kvm_features); > } else if ((val = strchr(featurestr, '='))) { > *val = 0; val++; > if (!strcmp(featurestr, "family")) { > @@ -481,10 +498,12 @@ static int cpu_x86_find_by_name(x86_def_t *x86_cpu_def, const char *cpu_model) > x86_cpu_def->ext_features |= plus_ext_features; > x86_cpu_def->ext2_features |= plus_ext2_features; > x86_cpu_def->ext3_features |= plus_ext3_features; > + x86_cpu_def->kvm_features |= plus_kvm_features; > x86_cpu_def->features&= ~minus_features; > x86_cpu_def->ext_features&= ~minus_ext_features; > x86_cpu_def->ext2_features&= ~minus_ext2_features; > x86_cpu_def->ext3_features&= ~minus_ext3_features; > + x86_cpu_def->kvm_features&= ~minus_kvm_features; > free(s); > return 0; > > @@ -529,7 +548,7 @@ static int cpu_x86_register (CPUX86State *env, const char *cpu_model) > env->cpuid_ext_features = def->ext_features; > env->cpuid_ext2_features = def->ext2_features; > env->cpuid_xlevel = def->xlevel; > - env->cpuid_ext3_features = def->ext3_features; > + env->cpuid_kvm_features = def->kvm_features; > { > const char *model_id = def->model_id; > int c, len, i; > diff --git a/target-i386/kvm.c b/target-i386/kvm.c > index 4084503..5b093ce 100644 > --- a/target-i386/kvm.c > +++ b/target-i386/kvm.c > @@ -25,6 +25,10 @@ > #include "gdbstub.h" > #include "host-utils.h" > > +#ifdef CONFIG_KVM_PARA > +#include<linux/kvm_para.h> > +#endif > +// > //#define DEBUG_KVM > > #ifdef DEBUG_KVM > @@ -134,6 +138,39 @@ static void kvm_trim_features(uint32_t *features, uint32_t supported) > } > } > > +#ifdef CONFIG_KVM_PARA > +struct kvm_para_features { > + int cap; > + int feature; > +} para_features[] = { > +#ifdef KVM_CAP_CLOCKSOURCE > + { KVM_CAP_CLOCKSOURCE, KVM_FEATURE_CLOCKSOURCE }, > +#endif > +#ifdef KVM_CAP_NOP_IO_DELAY > + { KVM_CAP_NOP_IO_DELAY, KVM_FEATURE_NOP_IO_DELAY }, > +#endif > +#ifdef KVM_CAP_PV_MMU > + { KVM_CAP_PV_MMU, KVM_FEATURE_MMU_OP }, > +#endif > +#ifdef KVM_CAP_CR3_CACHE > + { KVM_CAP_CR3_CACHE, KVM_FEATURE_CR3_CACHE }, > +#endif > + { -1, -1 } > +}; > + > +static int get_para_features(CPUState *env) > +{ > + int i, features = 0; > + > + for (i = 0; i< ARRAY_SIZE(para_features) - 1; i++) { > + if (kvm_check_extension(env->kvm_state, para_features[i].cap)) > + features |= (1<< para_features[i].feature); > + } > + > + return features; > +} > +#endif > + > int kvm_arch_init_vcpu(CPUState *env) > { > struct { > @@ -142,6 +179,10 @@ int kvm_arch_init_vcpu(CPUState *env) > } __attribute__((packed)) cpuid_data; > uint32_t limit, i, j, cpuid_i; > uint32_t unused; > + struct kvm_cpuid_entry2 *c; > +#ifdef KVM_CPUID_SIGNATURE > + uint32_t signature[3]; > +#endif > > env->mp_state = KVM_MP_STATE_RUNNABLE; > > @@ -160,10 +201,27 @@ int kvm_arch_init_vcpu(CPUState *env) > > cpuid_i = 0; > > +#ifdef CONFIG_KVM_PARA > + /* Paravirtualization CPUIDs */ > + memcpy(signature, "KVMKVMKVM\0\0\0", 12); > + c =&cpuid_data.entries[cpuid_i++]; > + memset(c, 0, sizeof(*c)); > + c->function = KVM_CPUID_SIGNATURE; > + c->eax = 0; > + c->ebx = signature[0]; > + c->ecx = signature[1]; > + c->edx = signature[2]; > + > + c =&cpuid_data.entries[cpuid_i++]; > + memset(c, 0, sizeof(*c)); > + c->function = KVM_CPUID_FEATURES; > + c->eax = env->cpuid_kvm_features& get_para_features(env); > +#endif > + > cpu_x86_cpuid(env, 0, 0,&limit,&unused,&unused,&unused); Instead of hooking here, would it make more sense to tie into the generic cpuid function in helper.c? Regards, Anthony Liguori
On Wed, Jan 13, 2010 at 10:05:33AM -0600, Anthony Liguori wrote: > >+#ifdef CONFIG_KVM_PARA > >+ /* Paravirtualization CPUIDs */ > >+ memcpy(signature, "KVMKVMKVM\0\0\0", 12); > >+ c =&cpuid_data.entries[cpuid_i++]; > >+ memset(c, 0, sizeof(*c)); > >+ c->function = KVM_CPUID_SIGNATURE; > >+ c->eax = 0; > >+ c->ebx = signature[0]; > >+ c->ecx = signature[1]; > >+ c->edx = signature[2]; > >+ > >+ c =&cpuid_data.entries[cpuid_i++]; > >+ memset(c, 0, sizeof(*c)); > >+ c->function = KVM_CPUID_FEATURES; > >+ c->eax = env->cpuid_kvm_features& get_para_features(env); > >+#endif > >+ > > cpu_x86_cpuid(env, 0, 0,&limit,&unused,&unused,&unused); > > Instead of hooking here, would it make more sense to tie into the > generic cpuid function in helper.c? > What do you mean? This patch ties into generic cpuid function in helper.c and pars kvm cpu flags there. Here we just configure kernel. -- Gleb.
On Wed, Jan 13, 2010 at 06:14:54PM +0200, Gleb Natapov wrote: > On Wed, Jan 13, 2010 at 10:05:33AM -0600, Anthony Liguori wrote: > > >+#ifdef CONFIG_KVM_PARA > > >+ /* Paravirtualization CPUIDs */ > > >+ memcpy(signature, "KVMKVMKVM\0\0\0", 12); > > >+ c =&cpuid_data.entries[cpuid_i++]; > > >+ memset(c, 0, sizeof(*c)); > > >+ c->function = KVM_CPUID_SIGNATURE; > > >+ c->eax = 0; > > >+ c->ebx = signature[0]; > > >+ c->ecx = signature[1]; > > >+ c->edx = signature[2]; > > >+ > > >+ c =&cpuid_data.entries[cpuid_i++]; > > >+ memset(c, 0, sizeof(*c)); > > >+ c->function = KVM_CPUID_FEATURES; > > >+ c->eax = env->cpuid_kvm_features& get_para_features(env); > > >+#endif > > >+ > > > cpu_x86_cpuid(env, 0, 0,&limit,&unused,&unused,&unused); > > > > Instead of hooking here, would it make more sense to tie into the > > generic cpuid function in helper.c? > > > What do you mean? This patch ties into generic cpuid function in > helper.c and pars kvm cpu flags there. Here we just configure > kernel. > Or do you mean making so that PV leaf will be available via cpu_x86_cpuid()? This make sense, but lets do it after merging this code path with qemu-kvm and the proposed patch brings qemu and qemu-kvm close together. -- Gleb.
On 01/13/2010 10:23 AM, Gleb Natapov wrote: > Or do you mean making so that PV leaf will be available via > cpu_x86_cpuid()? This make sense, but lets do it after merging this > code path with qemu-kvm and the proposed patch brings qemu and > qemu-kvm close together. > Yes, that's what I meant, and yes, I think that's a fine approach. Regards, Anthony Liguori
On 01/13/2010 07:25 AM, Gleb Natapov wrote: > Initialize KVM paravirt cpuid leaf and allow user to control guest > visible PV features through -cpu flag. > > Signed-off-by: Gleb Natapov<gleb@redhat.com> > Applied. Thanks. Regards, Anthony Liguori > --- > v1->v2 > fix indentation > remove unneeded ifdefs > v2->v3 > added needed ifdefs (CONFIG_KVM_PARA) > > diff --git a/target-i386/cpu.h b/target-i386/cpu.h > index f3834b3..216b00e 100644 > --- a/target-i386/cpu.h > +++ b/target-i386/cpu.h > @@ -701,7 +701,8 @@ typedef struct CPUX86State { > uint8_t nmi_pending; > uint8_t has_error_code; > uint32_t sipi_vector; > - > + uint32_t cpuid_kvm_features; > + > /* in order to simplify APIC support, we leave this pointer to the > user */ > struct APICState *apic_state; > diff --git a/target-i386/helper.c b/target-i386/helper.c > index 049fccf..70762bb 100644 > --- a/target-i386/helper.c > +++ b/target-i386/helper.c > @@ -58,10 +58,18 @@ static const char *ext3_feature_name[] = { > NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, > }; > > +static const char *kvm_feature_name[] = { > + "kvmclock", "kvm_nopiodelay", "kvm_mmu", NULL, NULL, NULL, NULL, NULL, > + NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, > + NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, > + NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, > +}; > + > static void add_flagname_to_bitmaps(const char *flagname, uint32_t *features, > uint32_t *ext_features, > uint32_t *ext2_features, > - uint32_t *ext3_features) > + uint32_t *ext3_features, > + uint32_t *kvm_features) > { > int i; > int found = 0; > @@ -86,6 +94,12 @@ static void add_flagname_to_bitmaps(const char *flagname, uint32_t *features, > *ext3_features |= 1<< i; > found = 1; > } > + for ( i = 0 ; i< 32 ; i++ ) > + if (kvm_feature_name[i]&& !strcmp (flagname, kvm_feature_name[i])) { > + *kvm_features |= 1<< i; > + found = 1; > + } > + > if (!found) { > fprintf(stderr, "CPU feature %s not found\n", flagname); > } > @@ -98,7 +112,7 @@ typedef struct x86_def_t { > int family; > int model; > int stepping; > - uint32_t features, ext_features, ext2_features, ext3_features; > + uint32_t features, ext_features, ext2_features, ext3_features, kvm_features; > uint32_t xlevel; > char model_id[48]; > int vendor_override; > @@ -375,8 +389,8 @@ static int cpu_x86_find_by_name(x86_def_t *x86_cpu_def, const char *cpu_model) > > char *s = strdup(cpu_model); > char *featurestr, *name = strtok(s, ","); > - uint32_t plus_features = 0, plus_ext_features = 0, plus_ext2_features = 0, plus_ext3_features = 0; > - uint32_t minus_features = 0, minus_ext_features = 0, minus_ext2_features = 0, minus_ext3_features = 0; > + uint32_t plus_features = 0, plus_ext_features = 0, plus_ext2_features = 0, plus_ext3_features = 0, plus_kvm_features = 0; > + uint32_t minus_features = 0, minus_ext_features = 0, minus_ext2_features = 0, minus_ext3_features = 0, minus_kvm_features = 0; > uint32_t numvalue; > > def = NULL; > @@ -394,17 +408,20 @@ static int cpu_x86_find_by_name(x86_def_t *x86_cpu_def, const char *cpu_model) > memcpy(x86_cpu_def, def, sizeof(*def)); > } > > + plus_kvm_features = ~0; /* not supported bits will be filtered out later */ > + > add_flagname_to_bitmaps("hypervisor",&plus_features, > -&plus_ext_features,&plus_ext2_features,&plus_ext3_features); > +&plus_ext_features,&plus_ext2_features,&plus_ext3_features, > +&plus_kvm_features); > > featurestr = strtok(NULL, ","); > > while (featurestr) { > char *val; > if (featurestr[0] == '+') { > - add_flagname_to_bitmaps(featurestr + 1,&plus_features,&plus_ext_features,&plus_ext2_features,&plus_ext3_features); > + add_flagname_to_bitmaps(featurestr + 1,&plus_features,&plus_ext_features,&plus_ext2_features,&plus_ext3_features,&plus_kvm_features); > } else if (featurestr[0] == '-') { > - add_flagname_to_bitmaps(featurestr + 1,&minus_features,&minus_ext_features,&minus_ext2_features,&minus_ext3_features); > + add_flagname_to_bitmaps(featurestr + 1,&minus_features,&minus_ext_features,&minus_ext2_features,&minus_ext3_features,&minus_kvm_features); > } else if ((val = strchr(featurestr, '='))) { > *val = 0; val++; > if (!strcmp(featurestr, "family")) { > @@ -481,10 +498,12 @@ static int cpu_x86_find_by_name(x86_def_t *x86_cpu_def, const char *cpu_model) > x86_cpu_def->ext_features |= plus_ext_features; > x86_cpu_def->ext2_features |= plus_ext2_features; > x86_cpu_def->ext3_features |= plus_ext3_features; > + x86_cpu_def->kvm_features |= plus_kvm_features; > x86_cpu_def->features&= ~minus_features; > x86_cpu_def->ext_features&= ~minus_ext_features; > x86_cpu_def->ext2_features&= ~minus_ext2_features; > x86_cpu_def->ext3_features&= ~minus_ext3_features; > + x86_cpu_def->kvm_features&= ~minus_kvm_features; > free(s); > return 0; > > @@ -529,7 +548,7 @@ static int cpu_x86_register (CPUX86State *env, const char *cpu_model) > env->cpuid_ext_features = def->ext_features; > env->cpuid_ext2_features = def->ext2_features; > env->cpuid_xlevel = def->xlevel; > - env->cpuid_ext3_features = def->ext3_features; > + env->cpuid_kvm_features = def->kvm_features; > { > const char *model_id = def->model_id; > int c, len, i; > diff --git a/target-i386/kvm.c b/target-i386/kvm.c > index 4084503..5b093ce 100644 > --- a/target-i386/kvm.c > +++ b/target-i386/kvm.c > @@ -25,6 +25,10 @@ > #include "gdbstub.h" > #include "host-utils.h" > > +#ifdef CONFIG_KVM_PARA > +#include<linux/kvm_para.h> > +#endif > +// > //#define DEBUG_KVM > > #ifdef DEBUG_KVM > @@ -134,6 +138,39 @@ static void kvm_trim_features(uint32_t *features, uint32_t supported) > } > } > > +#ifdef CONFIG_KVM_PARA > +struct kvm_para_features { > + int cap; > + int feature; > +} para_features[] = { > +#ifdef KVM_CAP_CLOCKSOURCE > + { KVM_CAP_CLOCKSOURCE, KVM_FEATURE_CLOCKSOURCE }, > +#endif > +#ifdef KVM_CAP_NOP_IO_DELAY > + { KVM_CAP_NOP_IO_DELAY, KVM_FEATURE_NOP_IO_DELAY }, > +#endif > +#ifdef KVM_CAP_PV_MMU > + { KVM_CAP_PV_MMU, KVM_FEATURE_MMU_OP }, > +#endif > +#ifdef KVM_CAP_CR3_CACHE > + { KVM_CAP_CR3_CACHE, KVM_FEATURE_CR3_CACHE }, > +#endif > + { -1, -1 } > +}; > + > +static int get_para_features(CPUState *env) > +{ > + int i, features = 0; > + > + for (i = 0; i< ARRAY_SIZE(para_features) - 1; i++) { > + if (kvm_check_extension(env->kvm_state, para_features[i].cap)) > + features |= (1<< para_features[i].feature); > + } > + > + return features; > +} > +#endif > + > int kvm_arch_init_vcpu(CPUState *env) > { > struct { > @@ -142,6 +179,10 @@ int kvm_arch_init_vcpu(CPUState *env) > } __attribute__((packed)) cpuid_data; > uint32_t limit, i, j, cpuid_i; > uint32_t unused; > + struct kvm_cpuid_entry2 *c; > +#ifdef KVM_CPUID_SIGNATURE > + uint32_t signature[3]; > +#endif > > env->mp_state = KVM_MP_STATE_RUNNABLE; > > @@ -160,10 +201,27 @@ int kvm_arch_init_vcpu(CPUState *env) > > cpuid_i = 0; > > +#ifdef CONFIG_KVM_PARA > + /* Paravirtualization CPUIDs */ > + memcpy(signature, "KVMKVMKVM\0\0\0", 12); > + c =&cpuid_data.entries[cpuid_i++]; > + memset(c, 0, sizeof(*c)); > + c->function = KVM_CPUID_SIGNATURE; > + c->eax = 0; > + c->ebx = signature[0]; > + c->ecx = signature[1]; > + c->edx = signature[2]; > + > + c =&cpuid_data.entries[cpuid_i++]; > + memset(c, 0, sizeof(*c)); > + c->function = KVM_CPUID_FEATURES; > + c->eax = env->cpuid_kvm_features& get_para_features(env); > +#endif > + > cpu_x86_cpuid(env, 0, 0,&limit,&unused,&unused,&unused); > > for (i = 0; i<= limit; i++) { > - struct kvm_cpuid_entry2 *c =&cpuid_data.entries[cpuid_i++]; > + c =&cpuid_data.entries[cpuid_i++]; > > switch (i) { > case 2: { > @@ -213,7 +271,7 @@ int kvm_arch_init_vcpu(CPUState *env) > cpu_x86_cpuid(env, 0x80000000, 0,&limit,&unused,&unused,&unused); > > for (i = 0x80000000; i<= limit; i++) { > - struct kvm_cpuid_entry2 *c =&cpuid_data.entries[cpuid_i++]; > + c =&cpuid_data.entries[cpuid_i++]; > > c->function = i; > c->flags = 0; > -- > Gleb. > > > >
diff --git a/target-i386/cpu.h b/target-i386/cpu.h index f3834b3..216b00e 100644 --- a/target-i386/cpu.h +++ b/target-i386/cpu.h @@ -701,7 +701,8 @@ typedef struct CPUX86State { uint8_t nmi_pending; uint8_t has_error_code; uint32_t sipi_vector; - + uint32_t cpuid_kvm_features; + /* in order to simplify APIC support, we leave this pointer to the user */ struct APICState *apic_state; diff --git a/target-i386/helper.c b/target-i386/helper.c index 049fccf..70762bb 100644 --- a/target-i386/helper.c +++ b/target-i386/helper.c @@ -58,10 +58,18 @@ static const char *ext3_feature_name[] = { NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, }; +static const char *kvm_feature_name[] = { + "kvmclock", "kvm_nopiodelay", "kvm_mmu", NULL, NULL, NULL, NULL, NULL, + NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, + NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, + NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, +}; + static void add_flagname_to_bitmaps(const char *flagname, uint32_t *features, uint32_t *ext_features, uint32_t *ext2_features, - uint32_t *ext3_features) + uint32_t *ext3_features, + uint32_t *kvm_features) { int i; int found = 0; @@ -86,6 +94,12 @@ static void add_flagname_to_bitmaps(const char *flagname, uint32_t *features, *ext3_features |= 1 << i; found = 1; } + for ( i = 0 ; i < 32 ; i++ ) + if (kvm_feature_name[i] && !strcmp (flagname, kvm_feature_name[i])) { + *kvm_features |= 1 << i; + found = 1; + } + if (!found) { fprintf(stderr, "CPU feature %s not found\n", flagname); } @@ -98,7 +112,7 @@ typedef struct x86_def_t { int family; int model; int stepping; - uint32_t features, ext_features, ext2_features, ext3_features; + uint32_t features, ext_features, ext2_features, ext3_features, kvm_features; uint32_t xlevel; char model_id[48]; int vendor_override; @@ -375,8 +389,8 @@ static int cpu_x86_find_by_name(x86_def_t *x86_cpu_def, const char *cpu_model) char *s = strdup(cpu_model); char *featurestr, *name = strtok(s, ","); - uint32_t plus_features = 0, plus_ext_features = 0, plus_ext2_features = 0, plus_ext3_features = 0; - uint32_t minus_features = 0, minus_ext_features = 0, minus_ext2_features = 0, minus_ext3_features = 0; + uint32_t plus_features = 0, plus_ext_features = 0, plus_ext2_features = 0, plus_ext3_features = 0, plus_kvm_features = 0; + uint32_t minus_features = 0, minus_ext_features = 0, minus_ext2_features = 0, minus_ext3_features = 0, minus_kvm_features = 0; uint32_t numvalue; def = NULL; @@ -394,17 +408,20 @@ static int cpu_x86_find_by_name(x86_def_t *x86_cpu_def, const char *cpu_model) memcpy(x86_cpu_def, def, sizeof(*def)); } + plus_kvm_features = ~0; /* not supported bits will be filtered out later */ + add_flagname_to_bitmaps("hypervisor", &plus_features, - &plus_ext_features, &plus_ext2_features, &plus_ext3_features); + &plus_ext_features, &plus_ext2_features, &plus_ext3_features, + &plus_kvm_features); featurestr = strtok(NULL, ","); while (featurestr) { char *val; if (featurestr[0] == '+') { - add_flagname_to_bitmaps(featurestr + 1, &plus_features, &plus_ext_features, &plus_ext2_features, &plus_ext3_features); + add_flagname_to_bitmaps(featurestr + 1, &plus_features, &plus_ext_features, &plus_ext2_features, &plus_ext3_features, &plus_kvm_features); } else if (featurestr[0] == '-') { - add_flagname_to_bitmaps(featurestr + 1, &minus_features, &minus_ext_features, &minus_ext2_features, &minus_ext3_features); + add_flagname_to_bitmaps(featurestr + 1, &minus_features, &minus_ext_features, &minus_ext2_features, &minus_ext3_features, &minus_kvm_features); } else if ((val = strchr(featurestr, '='))) { *val = 0; val++; if (!strcmp(featurestr, "family")) { @@ -481,10 +498,12 @@ static int cpu_x86_find_by_name(x86_def_t *x86_cpu_def, const char *cpu_model) x86_cpu_def->ext_features |= plus_ext_features; x86_cpu_def->ext2_features |= plus_ext2_features; x86_cpu_def->ext3_features |= plus_ext3_features; + x86_cpu_def->kvm_features |= plus_kvm_features; x86_cpu_def->features &= ~minus_features; x86_cpu_def->ext_features &= ~minus_ext_features; x86_cpu_def->ext2_features &= ~minus_ext2_features; x86_cpu_def->ext3_features &= ~minus_ext3_features; + x86_cpu_def->kvm_features &= ~minus_kvm_features; free(s); return 0; @@ -529,7 +548,7 @@ static int cpu_x86_register (CPUX86State *env, const char *cpu_model) env->cpuid_ext_features = def->ext_features; env->cpuid_ext2_features = def->ext2_features; env->cpuid_xlevel = def->xlevel; - env->cpuid_ext3_features = def->ext3_features; + env->cpuid_kvm_features = def->kvm_features; { const char *model_id = def->model_id; int c, len, i; diff --git a/target-i386/kvm.c b/target-i386/kvm.c index 4084503..5b093ce 100644 --- a/target-i386/kvm.c +++ b/target-i386/kvm.c @@ -25,6 +25,10 @@ #include "gdbstub.h" #include "host-utils.h" +#ifdef CONFIG_KVM_PARA +#include <linux/kvm_para.h> +#endif +// //#define DEBUG_KVM #ifdef DEBUG_KVM @@ -134,6 +138,39 @@ static void kvm_trim_features(uint32_t *features, uint32_t supported) } } +#ifdef CONFIG_KVM_PARA +struct kvm_para_features { + int cap; + int feature; +} para_features[] = { +#ifdef KVM_CAP_CLOCKSOURCE + { KVM_CAP_CLOCKSOURCE, KVM_FEATURE_CLOCKSOURCE }, +#endif +#ifdef KVM_CAP_NOP_IO_DELAY + { KVM_CAP_NOP_IO_DELAY, KVM_FEATURE_NOP_IO_DELAY }, +#endif +#ifdef KVM_CAP_PV_MMU + { KVM_CAP_PV_MMU, KVM_FEATURE_MMU_OP }, +#endif +#ifdef KVM_CAP_CR3_CACHE + { KVM_CAP_CR3_CACHE, KVM_FEATURE_CR3_CACHE }, +#endif + { -1, -1 } +}; + +static int get_para_features(CPUState *env) +{ + int i, features = 0; + + for (i = 0; i < ARRAY_SIZE(para_features) - 1; i++) { + if (kvm_check_extension(env->kvm_state, para_features[i].cap)) + features |= (1 << para_features[i].feature); + } + + return features; +} +#endif + int kvm_arch_init_vcpu(CPUState *env) { struct { @@ -142,6 +179,10 @@ int kvm_arch_init_vcpu(CPUState *env) } __attribute__((packed)) cpuid_data; uint32_t limit, i, j, cpuid_i; uint32_t unused; + struct kvm_cpuid_entry2 *c; +#ifdef KVM_CPUID_SIGNATURE + uint32_t signature[3]; +#endif env->mp_state = KVM_MP_STATE_RUNNABLE; @@ -160,10 +201,27 @@ int kvm_arch_init_vcpu(CPUState *env) cpuid_i = 0; +#ifdef CONFIG_KVM_PARA + /* Paravirtualization CPUIDs */ + memcpy(signature, "KVMKVMKVM\0\0\0", 12); + c = &cpuid_data.entries[cpuid_i++]; + memset(c, 0, sizeof(*c)); + c->function = KVM_CPUID_SIGNATURE; + c->eax = 0; + c->ebx = signature[0]; + c->ecx = signature[1]; + c->edx = signature[2]; + + c = &cpuid_data.entries[cpuid_i++]; + memset(c, 0, sizeof(*c)); + c->function = KVM_CPUID_FEATURES; + c->eax = env->cpuid_kvm_features & get_para_features(env); +#endif + cpu_x86_cpuid(env, 0, 0, &limit, &unused, &unused, &unused); for (i = 0; i <= limit; i++) { - struct kvm_cpuid_entry2 *c = &cpuid_data.entries[cpuid_i++]; + c = &cpuid_data.entries[cpuid_i++]; switch (i) { case 2: { @@ -213,7 +271,7 @@ int kvm_arch_init_vcpu(CPUState *env) cpu_x86_cpuid(env, 0x80000000, 0, &limit, &unused, &unused, &unused); for (i = 0x80000000; i <= limit; i++) { - struct kvm_cpuid_entry2 *c = &cpuid_data.entries[cpuid_i++]; + c = &cpuid_data.entries[cpuid_i++]; c->function = i; c->flags = 0;
Initialize KVM paravirt cpuid leaf and allow user to control guest visible PV features through -cpu flag. Signed-off-by: Gleb Natapov <gleb@redhat.com> --- v1->v2 fix indentation remove unneeded ifdefs v2->v3 added needed ifdefs (CONFIG_KVM_PARA) -- Gleb.