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Message-ID: <CAOJsxLE8Cn=GRSdeCoeTPKCOB5-gaodnC3W8g93r8mHigC23LA@mail.gmail.com> Date: Tue, 21 Aug 2012 17:42:08 +0300 From: Pekka Enberg <penberg@...nel.org> To: Andi Kleen <andi@...stfloor.org> Cc: "Yan, Zheng" <zheng.z.yan@...el.com>, a.p.zijlstra@...llo.nl, eranian@...gle.com, mingo@...e.hu, avi@...hat.com, linux-kernel@...r.kernel.org Subject: Re: [PATCH] perf/x86: Disable uncore on virtualized CPU. On Tue, Aug 21, 2012 at 05:08:37PM +0800, Yan, Zheng wrote: >> 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. On Tue, Aug 21, 2012 at 5:31 PM, Andi Kleen <andi@...stfloor.org> wrote: > I'm not sure cpu_has_hypervisor is reliable enough for this. > Better find out why it hangs and fix that. > > Early rdmsrls should be rdmsrl_safe() > Early writes in the driver should check if anything was written, > and if not then disable itself. It's unfortunate that the changelog does not include any reference to the actual thread this was discussed in: http://www.mail-archive.com/kvm@vger.kernel.org/msg77524.html -- 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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