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Limit the information exposed in PERF_CAPABILITIES to the LBR format only. This is helpful as hardware without model-specific LBRs set format to 0x3f in order to notify the feature is not present. Signed-off-by: Roger Pau Monné --- Seeing as we have never exposed PDCM in CPUID I wonder whether there's something that I'm missing that makes exposing PERF_CAPABILITIES LBR format not as trivial as it looks. --- xen/arch/x86/msr.c | 9 +++++++++ xen/include/public/arch-x86/cpufeatureset.h | 2 +- 2 files changed, 10 insertions(+), 1 deletion(-) diff --git a/xen/arch/x86/msr.c b/xen/arch/x86/msr.c index 01a15857b7..423a795d1d 100644 --- a/xen/arch/x86/msr.c +++ b/xen/arch/x86/msr.c @@ -316,6 +316,15 @@ int guest_rdmsr(struct vcpu *v, uint32_t msr, uint64_t *val) *val = 0; break; + case MSR_IA32_PERF_CAPABILITIES: + if ( !cp->basic.pdcm ) + goto gp_fault; + + /* Only report LBR format. */ + rdmsrl(MSR_IA32_PERF_CAPABILITIES, *val); + *val &= MSR_IA32_PERF_CAP_LBR_FORMAT; + break; + case MSR_X2APIC_FIRST ... MSR_X2APIC_LAST: if ( !is_hvm_domain(d) || v != curr ) goto gp_fault; diff --git a/xen/include/public/arch-x86/cpufeatureset.h b/xen/include/public/arch-x86/cpufeatureset.h index cd6409f9f3..5fdaec43c5 100644 --- a/xen/include/public/arch-x86/cpufeatureset.h +++ b/xen/include/public/arch-x86/cpufeatureset.h @@ -135,7 +135,7 @@ XEN_CPUFEATURE(SSSE3, 1*32+ 9) /*A Supplemental Streaming SIMD Extensio XEN_CPUFEATURE(FMA, 1*32+12) /*A Fused Multiply Add */ XEN_CPUFEATURE(CX16, 1*32+13) /*A CMPXCHG16B */ XEN_CPUFEATURE(XTPR, 1*32+14) /* Send Task Priority Messages */ -XEN_CPUFEATURE(PDCM, 1*32+15) /* Perf/Debug Capability MSR */ +XEN_CPUFEATURE(PDCM, 1*32+15) /*S Perf/Debug Capability MSR */ XEN_CPUFEATURE(PCID, 1*32+17) /*H Process Context ID */ XEN_CPUFEATURE(DCA, 1*32+18) /* Direct Cache Access */ XEN_CPUFEATURE(SSE4_1, 1*32+19) /*A Streaming SIMD Extensions 4.1 */ -- 2.36.0