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i386/cpu: Set and track CPUID_EXT3_CMP_LEG in env->features[FEAT_8000_0001_ECX]

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The correct usage is tracking and maintaining features in env->features[]
instead of manually set it in cpu_x86_cpuid().

Signed-off-by: Xiaoyao Li <xiaoyao.li@intel.com>
Link: https://lore.kernel.org/r/20241219110125.1266461-11-xiaoyao.li@intel.com
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Xiaoyao Li 2024-12-19 06:01:25 -05:00 • committed by Paolo Bonzini
parent c6bd2dd634
commit 99a637a86f
1 changed files with 9 additions and 11 deletions
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20
target/i386/cpu.c
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@ -6953,17 +6953,6 @@ void cpu_x86_cpuid(CPUX86State *env, uint32_t index, uint32_t count,
*ecx = env->features[FEAT_8000_0001_ECX];
*edx = env->features[FEAT_8000_0001_EDX];
/* The Linux kernel checks for the CMPLegacy bit and
* discards multiple thread information if it is set.
* So don't set it here for Intel to make Linux guests happy.
*/
if (threads_per_pkg > 1) {
if (env->cpuid_vendor1 != CPUID_VENDOR_INTEL_1 ||
env->cpuid_vendor2 != CPUID_VENDOR_INTEL_2 ||
env->cpuid_vendor3 != CPUID_VENDOR_INTEL_3) {
*ecx |= 1 << 1; /* CmpLegacy bit */
}
}
if (tcg_enabled() && env->cpuid_vendor1 == CPUID_VENDOR_INTEL_1 &&
!(env->hflags & HF_LMA_MASK)) {
*edx &= ~CPUID_EXT2_SYSCALL;
@ -7530,6 +7519,15 @@ void x86_cpu_expand_features(X86CPU *cpu, Error **errp)
if (x86_threads_per_pkg(&env->topo_info) > 1) {
env->features[FEAT_1_EDX] |= CPUID_HT;
/*
* The Linux kernel checks for the CMPLegacy bit and
* discards multiple thread information if it is set.
* So don't set it here for Intel to make Linux guests happy.
*/
if (!IS_INTEL_CPU(env)) {
env->features[FEAT_8000_0001_ECX] |= CPUID_EXT3_CMP_LEG;
}
}
for (i = 0; i < ARRAY_SIZE(feature_dependencies); i++) {