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target/i386: Add CPUID.1F generation support for multi-dies PCMachine

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The CPUID.1F as Intel V2 Extended Topology Enumeration Leaf would be
exposed if guests want to emulate multiple software-visible die within
each package. Per Intel's SDM, the 0x1f is a superset of 0xb, thus they
can be generated by almost same code as 0xb except die_offset setting.

If the number of dies per package is greater than 1, the cpuid_min_level
would be adjusted to 0x1f regardless of whether the host supports CPUID.1F.
Likewise, the CPUID.1F wouldn't be exposed if env->nr_dies < 2.

Suggested-by: Eduardo Habkost <ehabkost@redhat.com>
Signed-off-by: Like Xu <like.xu@linux.intel.com>
Message-Id: <20190620054525.37188-2-like.xu@linux.intel.com>
Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>
This commit is contained in:
Like Xu 2019-06-20 13:45:23 +08:00 committed by Eduardo Habkost
parent 1c809535e3
commit a94e142899
3 changed files with 54 additions and 0 deletions
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41
target/i386/cpu.c
View File

@ -4413,6 +4413,42 @@ void cpu_x86_cpuid(CPUX86State *env, uint32_t index, uint32_t count,
*ecx |= CPUID_TOPOLOGY_LEVEL_INVALID;
}
assert(!(*eax & ~0x1f));
*ebx &= 0xffff; /* The count doesn't need to be reliable. */
break;
case 0x1F:
/* V2 Extended Topology Enumeration Leaf */
if (env->nr_dies < 2) {
*eax = *ebx = *ecx = *edx = 0;
break;
}
*ecx = count & 0xff;
*edx = cpu->apic_id;
switch (count) {
case 0:
*eax = apicid_core_offset(env->nr_dies, cs->nr_cores,
cs->nr_threads);
*ebx = cs->nr_threads;
*ecx |= CPUID_TOPOLOGY_LEVEL_SMT;
break;
case 1:
*eax = apicid_die_offset(env->nr_dies, cs->nr_cores,
cs->nr_threads);
*ebx = cs->nr_cores * cs->nr_threads;
*ecx |= CPUID_TOPOLOGY_LEVEL_CORE;
break;
case 2:
*eax = apicid_pkg_offset(env->nr_dies, cs->nr_cores,
cs->nr_threads);
*ebx = env->nr_dies * cs->nr_cores * cs->nr_threads;
*ecx |= CPUID_TOPOLOGY_LEVEL_DIE;
break;
default:
*eax = 0;
*ebx = 0;
*ecx |= CPUID_TOPOLOGY_LEVEL_INVALID;
}
assert(!(*eax & ~0x1f));
*ebx &= 0xffff; /* The count doesn't need to be reliable. */
break;
@ -5094,6 +5130,11 @@ static void x86_cpu_expand_features(X86CPU *cpu, Error **errp)
x86_cpu_adjust_level(cpu, &cpu->env.cpuid_min_level, 0x14);
}
/* CPU topology with multi-dies support requires CPUID[0x1F] */
if (env->nr_dies > 1) {
x86_cpu_adjust_level(cpu, &env->cpuid_min_level, 0x1F);
}
/* SVM requires CPUID[0x8000000A] */
if (env->features[FEAT_8000_0001_ECX] & CPUID_EXT3_SVM) {
x86_cpu_adjust_level(cpu, &env->cpuid_min_xlevel, 0x8000000A);

1
target/i386/cpu.h
View File

@ -736,6 +736,7 @@ typedef uint32_t FeatureWordArray[FEATURE_WORDS];
#define CPUID_TOPOLOGY_LEVEL_INVALID (0U << 8)
#define CPUID_TOPOLOGY_LEVEL_SMT (1U << 8)
#define CPUID_TOPOLOGY_LEVEL_CORE (2U << 8)
#define CPUID_TOPOLOGY_LEVEL_DIE (5U << 8)
/* MSR Feature Bits */
#define MSR_ARCH_CAP_RDCL_NO (1U << 0)

12
target/i386/kvm.c
View File

@ -1451,6 +1451,10 @@ int kvm_arch_init_vcpu(CPUState *cs)
}
break;
}
case 0x1f:
if (env->nr_dies < 2) {
break;
}
case 4:
case 0xb:
case 0xd:
@ -1458,6 +1462,11 @@ int kvm_arch_init_vcpu(CPUState *cs)
if (i == 0xd && j == 64) {
break;
}
if (i == 0x1f && j == 64) {
break;
}
c->function = i;
c->flags = KVM_CPUID_FLAG_SIGNIFCANT_INDEX;
c->index = j;
@ -1469,6 +1478,9 @@ int kvm_arch_init_vcpu(CPUState *cs)
if (i == 0xb && !(c->ecx & 0xff00)) {
break;
}
if (i == 0x1f && !(c->ecx & 0xff00)) {
break;
}
if (i == 0xd && c->eax == 0) {
continue;
}