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perf/x86: Disable uncore on virtualized CPUs

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Initializing uncore PMU on virtualized CPU may hang the kernel.
This is because kvm does not emulate the entire hardware. Thers
are lots of uncore related MSRs, making kvm enumerate them all
is a non-trival task. So just disable uncore on virtualized CPU.

Signed-off-by: Yan, Zheng <zheng.z.yan@intel.com>
Tested-by: Pekka Enberg <penberg@kernel.org>
Cc: a.p.zijlstra@chello.nl
Cc: eranian@google.com
Cc: andi@firstfloor.org
Cc: avi@redhat.com
Link: http://lkml.kernel.org/r/1345540117-14164-1-git-send-email-zheng.z.yan@intel.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
This commit is contained in:
Yan, Zheng 2012-08-21 17:08:37 +08:00 committed by Ingo Molnar
parent 31fd84b95e
commit a05123bdd1
1 changed files with 3 additions and 0 deletions
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3
arch/x86/kernel/cpu/perf_event_intel_uncore.c
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@ -2926,6 +2926,9 @@ static int __init intel_uncore_init(void)
if (boot_cpu_data.x86_vendor != X86_VENDOR_INTEL)
return -ENODEV;
if (cpu_has_hypervisor)
return -ENODEV;
ret = uncore_pci_init();
if (ret)
goto fail;