linux-kernel - Re: [RFC PATCH 00/10] KVM: x86/mmu: simplify argument to kvm page fault handler

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Message-ID: <97ea1a31-4763-cefd-bfb8-8eeef46931b9@redhat.com>
Date:   Fri, 6 Aug 2021 18:07:05 +0200
From:   Paolo Bonzini <pbonzini@...hat.com>
To:     David Matlack <dmatlack@...gle.com>
Cc:     Isaku Yamahata <isaku.yamahata@...il.com>,
        Sean Christopherson <seanjc@...gle.com>,
        Isaku Yamahata <isaku.yamahata@...el.com>,
        kvm list <kvm@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Vitaly Kuznetsov <vkuznets@...hat.com>,
        Wanpeng Li <wanpengli@...cent.com>,
        Jim Mattson <jmattson@...gle.com>
Subject: Re: [RFC PATCH 00/10] KVM: x86/mmu: simplify argument to kvm page
 fault handler

On 29/07/21 19:24, David Matlack wrote:
> On Thu, Jul 29, 2021 at 10:17 AM Paolo Bonzini <pbonzini@...hat.com> wrote:
>>
>> On 29/07/21 18:48, David Matlack wrote:
>>> On Thu, Jun 10, 2021 at 3:05 PM Isaku Yamahata <isaku.yamahata@...il.com> wrote:
>>>>
>>>> Thanks for feedback. Let me respin it.
>>>
>>> Hi Isaku,
>>>
>>> I'm working on a series to plumb the memslot backing the faulting gfn
>>> through the page fault handling stack to avoid redundant lookups. This
>>> would be much cleaner to implement on top of your struct
>>> kvm_page_fault series than the existing code.
>>>
>>> Are you still planning to send another version of this series? Or if
>>> you have decided to drop it or go in a different direction?
>>
>> I can work on this and post updated patches next week.
> 
> Sounds good. For the record I'm also looking at adding an per-vCPU LRU
> slot, which *may* obviate the need to pass around the slot. (Isaku's
> series is still a nice cleanup regardless.)

Backport done, but not tested very well yet (and it's scary :)).

Paolo