linux-kernel - Re: [RFCv2 05/16] x86/kvm: Make VirtIO use DMA API in KVM guest

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Message-ID: <20201020124724.mk66h5ulm3xwdksc@black.fi.intel.com>
Date:   Tue, 20 Oct 2020 15:47:24 +0300
From:   "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>
To:     Christoph Hellwig <hch@...radead.org>
Cc:     "Kirill A. Shutemov" <kirill@...temov.name>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Andy Lutomirski <luto@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Paolo Bonzini <pbonzini@...hat.com>,
        Sean Christopherson <sean.j.christopherson@...el.com>,
        Vitaly Kuznetsov <vkuznets@...hat.com>,
        Wanpeng Li <wanpengli@...cent.com>,
        Jim Mattson <jmattson@...gle.com>,
        Joerg Roedel <joro@...tes.org>,
        David Rientjes <rientjes@...gle.com>,
        Andrea Arcangeli <aarcange@...hat.com>,
        Kees Cook <keescook@...omium.org>,
        Will Drewry <wad@...omium.org>,
        "Edgecombe, Rick P" <rick.p.edgecombe@...el.com>,
        "Kleen, Andi" <andi.kleen@...el.com>,
        Liran Alon <liran.alon@...cle.com>,
        Mike Rapoport <rppt@...nel.org>, x86@...nel.org,
        kvm@...r.kernel.org, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org
Subject: Re: [RFCv2 05/16] x86/kvm: Make VirtIO use DMA API in KVM guest

On Tue, Oct 20, 2020 at 09:06:58AM +0100, Christoph Hellwig wrote:
> NAK.  Any virtio implementation that needs special DMA OPS treatment
> needs to set the VIRTIO_F_ACCESS_PLATFORM bit.  The only reason the
> Xen hack existst is because it slipped in a long time ago and we can't
> fix that any more.

Thanks. Will fix.

-- 
 Kirill A. Shutemov