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kvm: use kernel-provided para_features instead of statically coming up with new capabilities 

Use the features provided by KVM_GET_SUPPORTED_CPUID directly to
mask out features from guest-visible cpuid.

The old get_para_features() mechanism is kept for older kernels that do not implement it.

Signed-off-by: Glauber Costa <glommer@redhat.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
This commit is contained in:
Glauber Costa 2011-03-17 19:42:05 -03:00 committed by Marcelo Tosatti
parent cd18f05e24
commit 0c31b744f6
1 changed files with 51 additions and 31 deletions
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82
target-i386/kvm.c
View File

@ -92,6 +92,35 @@ static struct kvm_cpuid2 *try_get_cpuid(KVMState *s, int max)
return cpuid;
}
#ifdef CONFIG_KVM_PARA
struct kvm_para_features {
int cap;
int feature;
} para_features[] = {
{ KVM_CAP_CLOCKSOURCE, KVM_FEATURE_CLOCKSOURCE },
{ KVM_CAP_NOP_IO_DELAY, KVM_FEATURE_NOP_IO_DELAY },
{ KVM_CAP_PV_MMU, KVM_FEATURE_MMU_OP },
#ifdef KVM_CAP_ASYNC_PF
{ KVM_CAP_ASYNC_PF, KVM_FEATURE_ASYNC_PF },
#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
uint32_t kvm_arch_get_supported_cpuid(CPUState *env, uint32_t function,
uint32_t index, int reg)
{
@ -99,6 +128,9 @@ uint32_t kvm_arch_get_supported_cpuid(CPUState *env, uint32_t function,
int i, max;
uint32_t ret = 0;
uint32_t cpuid_1_edx;
#ifdef CONFIG_KVM_PARA
int has_kvm_features = 0;
#endif
max = 1;
while ((cpuid = try_get_cpuid(env->kvm_state, max)) == NULL) {
@ -108,6 +140,11 @@ uint32_t kvm_arch_get_supported_cpuid(CPUState *env, uint32_t function,
for (i = 0; i < cpuid->nent; ++i) {
if (cpuid->entries[i].function == function &&
cpuid->entries[i].index == index) {
#ifdef CONFIG_KVM_PARA
if (cpuid->entries[i].function == KVM_CPUID_FEATURES) {
has_kvm_features = 1;
}
#endif
switch (reg) {
case R_EAX:
ret = cpuid->entries[i].eax;
@ -140,39 +177,16 @@ uint32_t kvm_arch_get_supported_cpuid(CPUState *env, uint32_t function,
qemu_free(cpuid);
#ifdef CONFIG_KVM_PARA
/* fallback for older kernels */
if (!has_kvm_features && (function == KVM_CPUID_FEATURES)) {
ret = get_para_features(env);
}
#endif
return ret;
}
#ifdef CONFIG_KVM_PARA
struct kvm_para_features {
int cap;
int feature;
} para_features[] = {
{ KVM_CAP_CLOCKSOURCE, KVM_FEATURE_CLOCKSOURCE },
{ KVM_CAP_NOP_IO_DELAY, KVM_FEATURE_NOP_IO_DELAY },
{ KVM_CAP_PV_MMU, KVM_FEATURE_MMU_OP },
#ifdef KVM_CAP_ASYNC_PF
{ KVM_CAP_ASYNC_PF, KVM_FEATURE_ASYNC_PF },
#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);
}
}
#ifdef KVM_CAP_ASYNC_PF
has_msr_async_pf_en = features & (1 << KVM_FEATURE_ASYNC_PF);
#endif
return features;
}
#endif /* CONFIG_KVM_PARA */
typedef struct HWPoisonPage {
ram_addr_t ram_addr;
QLIST_ENTRY(HWPoisonPage) list;
@ -397,7 +411,13 @@ int kvm_arch_init_vcpu(CPUState *env)
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);
c->eax = env->cpuid_kvm_features & kvm_arch_get_supported_cpuid(env,
KVM_CPUID_FEATURES, 0, R_EAX);
#ifdef KVM_CAP_ASYNC_PF
has_msr_async_pf_en = c->eax & (1 << KVM_FEATURE_ASYNC_PF);
#endif
#endif
cpu_x86_cpuid(env, 0, 0, &limit, &unused, &unused, &unused);