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authorChao Peng <chao.p.peng@linux.intel.com>2018-10-24 16:05:11 +0800
committerPaolo Bonzini <pbonzini@redhat.com>2018-12-21 11:28:35 +0100
commit86f5201df0d3e3efc78d3eac7fc5a59b813287cd (patch)
tree3f55a8ef84aa81ce4921a82069ece3014f519876 /arch/x86/kvm/cpuid.c
parentf99e3daf94ff35dd4a878d32ff66e1fd35223ad6 (diff)
downloadlinux-86f5201df0d3e3efc78d3eac7fc5a59b813287cd.tar.bz2
KVM: x86: Add Intel Processor Trace cpuid emulation
Expose Intel Processor Trace to guest only when the PT works in Host-Guest mode. Signed-off-by: Chao Peng <chao.p.peng@linux.intel.com> Signed-off-by: Luwei Kang <luwei.kang@intel.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to 'arch/x86/kvm/cpuid.c')
-rw-r--r--arch/x86/kvm/cpuid.c22
1 files changed, 20 insertions, 2 deletions
diff --git a/arch/x86/kvm/cpuid.c b/arch/x86/kvm/cpuid.c
index be5e64c61d8f..c731e87baef5 100644
--- a/arch/x86/kvm/cpuid.c
+++ b/arch/x86/kvm/cpuid.c
@@ -334,6 +334,7 @@ static inline int __do_cpuid_ent(struct kvm_cpuid_entry2 *entry, u32 function,
unsigned f_mpx = kvm_mpx_supported() ? F(MPX) : 0;
unsigned f_xsaves = kvm_x86_ops->xsaves_supported() ? F(XSAVES) : 0;
unsigned f_umip = kvm_x86_ops->umip_emulated() ? F(UMIP) : 0;
+ unsigned f_intel_pt = kvm_x86_ops->pt_supported() ? F(INTEL_PT) : 0;
/* cpuid 1.edx */
const u32 kvm_cpuid_1_edx_x86_features =
@@ -392,7 +393,7 @@ static inline int __do_cpuid_ent(struct kvm_cpuid_entry2 *entry, u32 function,
F(BMI2) | F(ERMS) | f_invpcid | F(RTM) | f_mpx | F(RDSEED) |
F(ADX) | F(SMAP) | F(AVX512IFMA) | F(AVX512F) | F(AVX512PF) |
F(AVX512ER) | F(AVX512CD) | F(CLFLUSHOPT) | F(CLWB) | F(AVX512DQ) |
- F(SHA_NI) | F(AVX512BW) | F(AVX512VL);
+ F(SHA_NI) | F(AVX512BW) | F(AVX512VL) | f_intel_pt;
/* cpuid 0xD.1.eax */
const u32 kvm_cpuid_D_1_eax_x86_features =
@@ -423,7 +424,7 @@ static inline int __do_cpuid_ent(struct kvm_cpuid_entry2 *entry, u32 function,
switch (function) {
case 0:
- entry->eax = min(entry->eax, (u32)0xd);
+ entry->eax = min(entry->eax, (u32)(f_intel_pt ? 0x14 : 0xd));
break;
case 1:
entry->edx &= kvm_cpuid_1_edx_x86_features;
@@ -600,6 +601,23 @@ static inline int __do_cpuid_ent(struct kvm_cpuid_entry2 *entry, u32 function,
}
break;
}
+ /* Intel PT */
+ case 0x14: {
+ int t, times = entry->eax;
+
+ if (!f_intel_pt)
+ break;
+
+ entry->flags |= KVM_CPUID_FLAG_SIGNIFCANT_INDEX;
+ for (t = 1; t <= times; ++t) {
+ if (*nent >= maxnent)
+ goto out;
+ do_cpuid_1_ent(&entry[t], function, t);
+ entry[t].flags |= KVM_CPUID_FLAG_SIGNIFCANT_INDEX;
+ ++*nent;
+ }
+ break;
+ }
case KVM_CPUID_SIGNATURE: {
static const char signature[12] = "KVMKVMKVM\0\0";
const u32 *sigptr = (const u32 *)signature;