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Message-Id: <1345540117-14164-1-git-send-email-zheng.z.yan@intel.com> Date: Tue, 21 Aug 2012 17:08:37 +0800 From: "Yan, Zheng" <zheng.z.yan@...el.com> To: a.p.zijlstra@...llo.nl, eranian@...gle.com, mingo@...e.hu, andi@...stfloor.org, avi@...hat.com, linux-kernel@...r.kernel.org Cc: "Yan, Zheng" <zheng.z.yan@...el.com> Subject: [PATCH] perf/x86: Disable uncore on virtualized CPU. From: "Yan, Zheng" <zheng.z.yan@...el.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@...el.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; -- 1.7.11.2 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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