Messages in this thread | | | Date | Wed, 5 Sep 2012 08:35:24 +0200 | From | Ingo Molnar <> | Subject | Re: [PATCH] perf/x86: Disable uncore on virtualized CPU. |
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* Yan, Zheng <zheng.z.yan@intel.com> wrote:
> From: "Yan, Zheng" <zheng.z.yan@intel.com> > > 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> > --- > arch/x86/kernel/cpu/perf_event_intel_uncore.c | 3 +++ > 1 file changed, 3 insertions(+) > > diff --git a/arch/x86/kernel/cpu/perf_event_intel_uncore.c b/arch/x86/kernel/cpu/perf_event_intel_uncore.c > index 0a55710..2f005ba 100644 > --- a/arch/x86/kernel/cpu/perf_event_intel_uncore.c > +++ b/arch/x86/kernel/cpu/perf_event_intel_uncore.c > @@ -2898,6 +2898,9 @@ 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;
Cannot the presence of the uncore hardware be detected in a cleaner fashion, via the PCI config space and such?
Thanks,
Ingo
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