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target/i386: set the CPUID level to 0x14 on old machine-type

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The CPUID level need to be set to 0x14 manually on old
machine-type if Intel PT is enabled in guest. E.g. the
CPUID[0].EAX(level)=7 and CPUID[7].EBX[25](intel-pt)=1 when the
Qemu with "-machine pc-i440fx-3.1 -cpu qemu64,+intel-pt" parameter.

Some Intel PT capabilities are exposed by leaf 0x14 and the
missing capabilities will cause some MSRs access failed.
This patch add a warning message to inform the user to extend
the CPUID level.

Suggested-by: Eduardo Habkost <ehabkost@redhat.com>
Signed-off-by: Luwei Kang <luwei.kang@intel.com>
Message-Id: <1584031686-16444-1-git-send-email-luwei.kang@intel.com>
Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>
This commit is contained in:
Luwei Kang 2020-03-13 00:48:06 +08:00 committed by Eduardo Habkost
parent 7b225762c8
commit ddc2fc9e4e
1 changed files with 8 additions and 3 deletions
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11
target/i386/cpu.c
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@ -6356,9 +6356,14 @@ static void x86_cpu_expand_features(X86CPU *cpu, Error **errp)
x86_cpu_adjust_feat_level(cpu, FEAT_XSAVE);
/* Intel Processor Trace requires CPUID[0x14] */
if ((env->features[FEAT_7_0_EBX] & CPUID_7_0_EBX_INTEL_PT) &&
kvm_enabled() && cpu->intel_pt_auto_level) {
x86_cpu_adjust_level(cpu, &cpu->env.cpuid_min_level, 0x14);
if ((env->features[FEAT_7_0_EBX] & CPUID_7_0_EBX_INTEL_PT)) {
if (cpu->intel_pt_auto_level) {
x86_cpu_adjust_level(cpu, &cpu->env.cpuid_min_level, 0x14);
} else if (cpu->env.cpuid_min_level < 0x14) {
mark_unavailable_features(cpu, FEAT_7_0_EBX,
CPUID_7_0_EBX_INTEL_PT,
"Intel PT need CPUID leaf 0x14, please set by \"-cpu ...,+intel-pt,level=0x14\"");
}
}
/* CPU topology with multi-dies support requires CPUID[0x1F] */