Re: [PATCH v2 0/3] nVMX: Emulated Page Modification Logging for Nested Virtualization

From	Paolo Bonzini <pbonzini@redhat.com>
Newsgroups	linux.kernel
Subject	Re: [PATCH v2 0/3] nVMX: Emulated Page Modification Logging for Nested Virtualization
Date	2017-05-11 07:10 +0200
Message-ID	<tFOwp-22k-1@gated-at.bofh.it> (permalink)
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On 09/05/2017 18:03, Bandan Das wrote:
>> I tested this with api/dirty-log-perf, and nested PML is more than 3
>> times faster than pml=0.  I want to do a few more tests because I don't
>> see any PML full exits in the L1 trace, but it seems to be a nice
>> improvement!
>
> Thanks for testing! Regarding the PML full exits, I did notice their
> absence. I induced it artifically in my testing with a lower index
> and it seemed to work fine.

Yes, tracing showed that it's because the guest's EXTERNAL_INTERRUPT
exits are too frequent.

Paolo

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[PATCH v2 0/3] nVMX: Emulated Page Modification Logging for Nested Virtualization Bandan Das <bsd@redhat.com> - 2017-05-05 21:30 +0200
  [PATCH v2 1/3] kvm: x86: Add a hook for arch specific dirty logging emulation Bandan Das <bsd@redhat.com> - 2017-05-05 21:30 +0200
    Re: [PATCH v2 1/3] kvm: x86: Add a hook for arch specific dirty  logging emulation "Huang, Kai" <kai.huang@linux.intel.com> - 2017-05-10 13:00 +0200
      Re: [PATCH v2 1/3] kvm: x86: Add a hook for arch specific dirty logging emulation Bandan Das <bsd@redhat.com> - 2017-05-10 18:00 +0200
        Re: [PATCH v2 1/3] kvm: x86: Add a hook for arch specific dirty  logging emulation "Huang, Kai" <kai.huang@linux.intel.com> - 2017-05-11 01:30 +0200
          Re: [PATCH v2 1/3] kvm: x86: Add a hook for arch specific dirty logging emulation Bandan Das <bsd@redhat.com> - 2017-05-11 20:40 +0200
  Re: [PATCH v2 0/3] nVMX: Emulated Page Modification Logging for  Nested Virtualization Paolo Bonzini <pbonzini@redhat.com> - 2017-05-09 17:30 +0200
    Re: [PATCH v2 0/3] nVMX: Emulated Page Modification Logging for Nested Virtualization Bandan Das <bsd@redhat.com> - 2017-05-09 18:10 +0200
      Re: [PATCH v2 0/3] nVMX: Emulated Page Modification Logging for  Nested Virtualization Paolo Bonzini <pbonzini@redhat.com> - 2017-05-11 07:10 +0200

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