Messages in this thread | | | Date | Tue, 21 Aug 2012 16:31:15 +0200 | From | Andi Kleen <> | 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@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.
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.
-Andi
| |