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17 May 2024, 09:02:56 UTC
Revision c9b08884c9c98929ec2d8abafd78e89062d01ee7 authored by Peter Zijlstra on 03 February 2014, 13:29:03 UTC, committed by Thomas Gleixner on 21 February 2014, 21:09:01 UTC 
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>
1 parent a3ef222
History
Tip revision: c9b08884c9c98929ec2d8abafd78e89062d01ee7 authored by Peter Zijlstra on 03 February 2014, 13:29:03 UTC
perf/x86: Correctly use FEATURE_PDCM
Tip revision: c9b0888
File Mode Size
Makefile -rw-r--r-- 394 bytes
compat.c -rw-r--r-- 19.2 KB
compat_mq.c -rw-r--r-- 4.1 KB
ipc_sysctl.c -rw-r--r-- 7.0 KB
ipcns_notifier.c -rw-r--r-- 2.2 KB
mq_sysctl.c -rw-r--r-- 2.7 KB
mqueue.c -rw-r--r-- 35.4 KB
msg.c -rw-r--r-- 23.4 KB
msgutil.c -rw-r--r-- 3.6 KB
namespace.c -rw-r--r-- 4.7 KB
sem.c -rw-r--r-- 54.4 KB
shm.c -rw-r--r-- 31.9 KB
syscall.c -rw-r--r-- 2.3 KB
util.c -rw-r--r-- 22.5 KB
util.h -rw-r--r-- 5.8 KB
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