Messages in this thread | | | Subject | Re: perf with precise attribute kills all KVM based VMs | From | Peter Zijlstra <> | Date | Mon, 09 Jul 2012 16:24:04 +0200 |
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On Mon, 2012-07-09 at 17:19 +0300, Gleb Natapov wrote: > Yes, this is knows problem that I can't find time to fix. The crash is > cause by CPU using host PEBS virtual address while guest is running > which causes guest memory corruption. We should disable evens that use > PEBS at the guest entry.
Whoops.. so the hardware is reading the DS address as programmed by the host (host linear address) and using it as a guest linear address?
Quality stuff..
Disabling PEBS events for guests isn't pretty though.. but I guess the only alternative is mapping the DS into the guest and reprogramming MSR_IA32_DS_AREA which is all a little involved I suppose?
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