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| author |   Chao Peng <chao.p.peng@linux.intel.com> | 2018-10-24 16:05:11 +0800 |
|---|---|---|
| committer |   Paolo Bonzini <pbonzini@redhat.com> | 2018-12-21 11:28:35 +0100 |
| commit | 86f5201df0d3e3efc78d3eac7fc5a59b813287cd (patch) | |
| tree | 3f55a8ef84aa81ce4921a82069ece3014f519876 /arch/x86/kvm/cpuid.c | |
| parent | KVM: x86: Add Intel PT virtualization work mode (diff) | |
| download | linux-dev-86f5201df0d3e3efc78d3eac7fc5a59b813287cd.tar.xz linux-dev-86f5201df0d3e3efc78d3eac7fc5a59b813287cd.zip | |
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.c | 22 |
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; |