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target-i386: xsave: Calculate enabled components only once 

Instead of checking both env->features and ena_mask at two
different places in the CPUID code, initialize ena_mask based on
the features that are enabled for the CPU, and then clear
unsupported bits based on kvm_arch_get_supported_cpuid().

The results should be exactly the same, but it will make it
easier to move the mask calculation elsewhare, and reuse
x86_cpu_filter_features() for the kvm_arch_get_supported_cpuid()
check.

Reviewed-by: Richard Henderson <rth@twiddle.net>
Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>
This commit is contained in:
Eduardo Habkost 2016-09-22 14:33:01 -03:00
parent 9646f4927f
commit 4928cd6de6
1 changed files with 16 additions and 10 deletions
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26
target-i386/cpu.c
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@ -2490,7 +2490,6 @@ void cpu_x86_cpuid(CPUX86State *env, uint32_t index, uint32_t count,
*ebx &= 0xffff; /* The count doesn't need to be reliable. */
break;
case 0xD: {
KVMState *s = cs->kvm_state;
uint64_t ena_mask;
int i;
@ -2502,20 +2501,28 @@ void cpu_x86_cpuid(CPUX86State *env, uint32_t index, uint32_t count,
if (!(env->features[FEAT_1_ECX] & CPUID_EXT_XSAVE)) {
break;
}
ena_mask = (XSTATE_FP_MASK | XSTATE_SSE_MASK);
for (i = 2; i < ARRAY_SIZE(x86_ext_save_areas); i++) {
const ExtSaveArea *esa = &x86_ext_save_areas[i];
if (env->features[esa->feature] & esa->bits) {
ena_mask |= (1ULL << i);
}
}
if (kvm_enabled()) {
ena_mask = kvm_arch_get_supported_cpuid(s, 0xd, 0, R_EDX);
ena_mask <<= 32;
ena_mask |= kvm_arch_get_supported_cpuid(s, 0xd, 0, R_EAX);
} else {
ena_mask = -1;
KVMState *s = cs->kvm_state;
uint64_t kvm_mask = kvm_arch_get_supported_cpuid(s, 0xd, 0, R_EDX);
kvm_mask <<= 32;
kvm_mask |= kvm_arch_get_supported_cpuid(s, 0xd, 0, R_EAX);
ena_mask &= kvm_mask;
}
if (count == 0) {
*ecx = 0x240;
for (i = 2; i < ARRAY_SIZE(x86_ext_save_areas); i++) {
const ExtSaveArea *esa = &x86_ext_save_areas[i];
if ((env->features[esa->feature] & esa->bits)
&& ((ena_mask >> i) & 1) != 0) {
if ((ena_mask >> i) & 1) {
if (i < 32) {
*eax |= 1u << i;
} else {
@ -2530,8 +2537,7 @@ void cpu_x86_cpuid(CPUX86State *env, uint32_t index, uint32_t count,
*eax = env->features[FEAT_XSAVE];
} else if (count < ARRAY_SIZE(x86_ext_save_areas)) {
const ExtSaveArea *esa = &x86_ext_save_areas[count];
if ((env->features[esa->feature] & esa->bits)
&& ((ena_mask >> count) & 1) != 0) {
if ((ena_mask >> count) & 1) {
*eax = esa->size;
*ebx = esa->offset;
}