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

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Message-ID: <8578b7ca-4a81-7a06-7ac8-9f6f5740a7de@redhat.com>
Date:   Tue, 9 May 2017 18:04:57 +0200
From:   Paolo Bonzini <pbonzini@...hat.com>
To:     Bandan Das <bsd@...hat.com>
Cc:     kvm@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 0/3] nVMX: Emulated Page Modification Logging for
 Nested Virtualization



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