Messages in this thread | | | From | Vitaly Kuznetsov <> | Subject | Re: [PATCH RFC] Revert "KVM: VMX: Micro-optimize vmexit time when not exposing PMU" | Date | Fri, 19 Jun 2020 13:29:38 +0200 |
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"Xu, Like" <like.xu@intel.com> writes:
> On 2020/6/19 17:40, Vitaly Kuznetsov wrote: >> Guest crashes are observed on a Cascade Lake system when 'perf top' is >> launched on the host, e.g. > Interesting, is it specific to Cascade Lake? >
Actually no, just reproduced this on a Haswell system. If you run the guest with "-cpu host,-pmu" and do 'perf top' (on the host) the guest crashes immediately.
> Would you mind sharing the output of > "cpuid -r -l 1 -1" and "cat /proc/cpuinfo| grep microcode | uniq" with us ?
Sure (this is probably unrelated because the issue also reproduces on Haswell but still):
# cpuid -r -l 1 -1
CPU: 0x00000001 0x00: eax=0x00050657 ebx=0x03200800 ecx=0x7ffefbff edx=0xbfebfbff
# cat /proc/cpuinfo| grep microcode | uniq microcode : 0x500002c
This is "Intel(R) Xeon(R) Gold 5218 CPU @ 2.30GHz"
-- Vitaly
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