Messages in this thread | | | Date | Tue, 21 Aug 2012 17:42:08 +0300 | Subject | Re: [PATCH] perf/x86: Disable uncore on virtualized CPU. | From | Pekka Enberg <> |
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On Tue, Aug 21, 2012 at 05:08:37PM +0800, Yan, Zheng 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.
On Tue, Aug 21, 2012 at 5:31 PM, Andi Kleen <andi@firstfloor.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
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