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

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On 05/05/2017 21:25, Bandan Das wrote:
> v2:
> 2/3: Clear out all bits except bit 12
> 3/3: Slightly modify an existing comment, honor L0's
> PML setting when clearing it for L1
> 
> v1:
> http://www.spinics.net/lists/kvm/msg149247.html
> 
> These patches implement PML on top of EPT A/D emulation
> (ae1e2d1082ae).
> 
> When dirty bit is being set, we write the gpa to the
> buffer provided by L1. If the index overflows, we just
> change the exit reason before running L1.

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!

Paolo

> Bandan Das (3):
>   kvm: x86: Add a hook for arch specific dirty logging emulation
>   nVMX: Implement emulated Page Modification Logging
>   nVMX: Advertise PML to L1 hypervisor
> 
>  arch/x86/include/asm/kvm_host.h |  2 +
>  arch/x86/kvm/mmu.c              | 15 +++++++
>  arch/x86/kvm/mmu.h              |  1 +
>  arch/x86/kvm/paging_tmpl.h      |  4 ++
>  arch/x86/kvm/vmx.c              | 97 ++++++++++++++++++++++++++++++++++++++---
>  5 files changed, 112 insertions(+), 7 deletions(-)
> 

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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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