linux-kernel - Re: [PATCH 0/4] KVM: x86/mmu: Bug fixes and cleanups in get_mmio

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Date:   Mon, 21 Dec 2020 19:26:53 +0100
From:   Paolo Bonzini <pbonzini@...hat.com>
To:     Sean Christopherson <seanjc@...gle.com>
Cc:     Vitaly Kuznetsov <vkuznets@...hat.com>,
        Wanpeng Li <wanpengli@...cent.com>,
        Jim Mattson <jmattson@...gle.com>,
        Joerg Roedel <joro@...tes.org>, kvm@...r.kernel.org,
        linux-kernel@...r.kernel.org, Ben Gardon <bgardon@...gle.com>,
        Richard Herbert <rherbert@...patico.ca>
Subject: Re: [PATCH 0/4] KVM: x86/mmu: Bug fixes and cleanups in
 get_mmio_spte()

On 18/12/20 01:31, Sean Christopherson wrote:
> Two fixes for bugs that were introduced along with the TDP MMU (though I
> strongly suspect only the one reported by Richard, fixed in patch 2/4, is
> hittable in practice).  Two additional cleanup on top to try and make the
> code a bit more readable and shave a few cycles.
> 
> Sean Christopherson (4):
>    KVM: x86/mmu: Use -1 to flag an undefined spte in get_mmio_spte()
>    KVM: x86/mmu: Get root level from walkers when retrieving MMIO SPTE
>    KVM: x86/mmu: Use raw level to index into MMIO walks' sptes array
>    KVM: x86/mmu: Optimize not-present/MMIO SPTE check in get_mmio_spte()
> 
>   arch/x86/kvm/mmu/mmu.c     | 53 +++++++++++++++++++++-----------------
>   arch/x86/kvm/mmu/tdp_mmu.c |  9 ++++---
>   arch/x86/kvm/mmu/tdp_mmu.h |  4 ++-
>   3 files changed, 39 insertions(+), 27 deletions(-)
> 

Queued, thanks (and thanks for Ccing stable on the first two already :)).

Paolo