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authorPeter Zijlstra <peterz@infradead.org>2014-02-03 14:29:03 +0100
committerThomas Gleixner <tglx@linutronix.de>2014-02-21 22:09:01 +0100
commitc9b08884c9c98929ec2d8abafd78e89062d01ee7 (patch)
treed7e9cd28d499baa17f6f33d9493a91d62e1f217d /lib
parenta3ef2229c94ff70998724cb64b9cb4c77db9e950 (diff)
perf/x86: Correctly use FEATURE_PDCM
The current code simply assumes Intel Arch PerfMon v2+ to have the IA32_PERF_CAPABILITIES MSR; the SDM specifies that we should check CPUID[1].ECX[15] (aka, FEATURE_PDCM) instead. This was found by KVM which implements v2+ but didn't provide the capabilities MSR. Change the code to DTRT; KVM will also implement the MSR and return 0. Cc: pbonzini@redhat.com Reported-by: "Michael S. Tsirkin" <mst@redhat.com> Suggested-by: Eduardo Habkost <ehabkost@redhat.com> Signed-off-by: Peter Zijlstra <peterz@infradead.org> Link: http://lkml.kernel.org/r/20140203132903.GI8874@twins.programming.kicks-ass.net Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Diffstat (limited to 'lib')
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