On Sun, Oct 27, 2019 at 07:11:11PM -0400, Luwei Kang wrote: > Intel new hardware introduces a mechanism to direct PEBS records > output into the Intel PT buffer that can be used for enabling PEBS > in KVM guest. This patch implements the registers read and write > emulation when PEBS is supported in KVM guest. > > KMM needs to reprogram the counters when the value of these MSRs > be changed that to make sure it can take effect in hardware. > > Signed-off-by: Luwei Kang <luwei.kang@xxxxxxxxx> > --- > arch/x86/include/asm/kvm_host.h | 4 +++ > arch/x86/include/asm/msr-index.h | 6 ++++ > arch/x86/kvm/vmx/capabilities.h | 15 ++++++++++ > arch/x86/kvm/vmx/pmu_intel.c | 63 ++++++++++++++++++++++++++++++++++++++-- > 4 files changed, 86 insertions(+), 2 deletions(-) > > diff --git a/arch/x86/include/asm/msr-index.h b/arch/x86/include/asm/msr-index.h > index 20ce682..d22f8d9 100644 > --- a/arch/x86/include/asm/msr-index.h > +++ b/arch/x86/include/asm/msr-index.h > @@ -131,9 +131,13 @@ > #define LBR_INFO_ABORT BIT_ULL(61) > #define LBR_INFO_CYCLES 0xffff > > +#define MSR_IA32_PEBS_PMI_AFTER_REC BIT_ULL(60) > +#define MSR_IA32_PEBS_OUTPUT_PT BIT_ULL(61) > +#define MSR_IA32_PEBS_OUTPUT_MASK (3ULL << 61) > #define MSR_IA32_PEBS_ENABLE 0x000003f1 > #define MSR_PEBS_DATA_CFG 0x000003f2 > #define MSR_IA32_DS_AREA 0x00000600 > +#define MSR_IA32_PERF_CAP_PEBS_OUTPUT_PT BIT_ULL(16) > #define MSR_IA32_PERF_CAPABILITIES 0x00000345 > #define MSR_PEBS_LD_LAT_THRESHOLD 0x000003f6 > > @@ -665,6 +669,8 @@ > #define MSR_IA32_MISC_ENABLE_FERR (1ULL << MSR_IA32_MISC_ENABLE_FERR_BIT) > #define MSR_IA32_MISC_ENABLE_FERR_MULTIPLEX_BIT 10 > #define MSR_IA32_MISC_ENABLE_FERR_MULTIPLEX (1ULL << MSR_IA32_MISC_ENABLE_FERR_MULTIPLEX_BIT) > +#define MSR_IA32_MISC_ENABLE_PEBS_BIT 12 > +#define MSR_IA32_MISC_ENABLE_PEBS (1ULL << MSR_IA32_MISC_ENABLE_PEBS_BIT) > #define MSR_IA32_MISC_ENABLE_TM2_BIT 13 > #define MSR_IA32_MISC_ENABLE_TM2 (1ULL << MSR_IA32_MISC_ENABLE_TM2_BIT) > #define MSR_IA32_MISC_ENABLE_ADJ_PREF_DISABLE_BIT 19 Some of these already exist but are local to perf. Don't blindly introduce more without unifying.
