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

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

To: "Kirill A. Shutemov" <kirill@xxxxxxxxxxxxx>
Subject: Re: [RFCv2 05/16] x86/kvm: Make VirtIO use DMA API in KVM guest
From: Christoph Hellwig <hch@xxxxxxxxxxxxx>
Date: Tue, 20 Oct 2020 09:06:58 +0100
Cc: Dave Hansen <dave.hansen@xxxxxxxxxxxxxxx>, Andy Lutomirski <luto@xxxxxxxxxx>, Peter Zijlstra <peterz@xxxxxxxxxxxxx>, Paolo Bonzini <pbonzini@xxxxxxxxxx>, Sean Christopherson <sean.j.christopherson@xxxxxxxxx>, Vitaly Kuznetsov <vkuznets@xxxxxxxxxx>, Wanpeng Li <wanpengli@xxxxxxxxxxx>, Jim Mattson <jmattson@xxxxxxxxxx>, Joerg Roedel <joro@xxxxxxxxxx>, David Rientjes <rientjes@xxxxxxxxxx>, Andrea Arcangeli <aarcange@xxxxxxxxxx>, Kees Cook <keescook@xxxxxxxxxxxx>, Will Drewry <wad@xxxxxxxxxxxx>, "Edgecombe, Rick P" <rick.p.edgecombe@xxxxxxxxx>, "Kleen, Andi" <andi.kleen@xxxxxxxxx>, Liran Alon <liran.alon@xxxxxxxxxx>, Mike Rapoport <rppt@xxxxxxxxxx>, x86@xxxxxxxxxx, kvm@xxxxxxxxxxxxxxx, linux-mm@xxxxxxxxx, linux-kernel@xxxxxxxxxxxxxxx, "Kirill A. Shutemov" <kirill.shutemov@xxxxxxxxxxxxxxx>
In-reply-to: <20201020061859.18385-6-kirill.shutemov@linux.intel.com>
References: <20201020061859.18385-1-kirill.shutemov@linux.intel.com> <20201020061859.18385-6-kirill.shutemov@linux.intel.com>

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.

Follow-Ups:
- Re: [RFCv2 05/16] x86/kvm: Make VirtIO use DMA API in KVM guest
  - From: Kirill A. Shutemov

References:
- [RFCv2 00/16] KVM protected memory extension
  - From: Kirill A. Shutemov
- [RFCv2 05/16] x86/kvm: Make VirtIO use DMA API in KVM guest
  - From: Kirill A. Shutemov

Prev by Date: Re: [External] Re: [RFC 0/4] Introduce VDUSE - vDPA Device in Userspace
Next by Date: Re: [PATCH] mm, hugetlb: Avoid double clearing for hugetlb pages
Previous by thread: [RFCv2 05/16] x86/kvm: Make VirtIO use DMA API in KVM guest
Next by thread: Re: [RFCv2 05/16] x86/kvm: Make VirtIO use DMA API in KVM guest
Index(es):
- Date
- Thread

[Index of Archives] [Linux ARM Kernel] [Linux ARM] [Linux Omap] [Fedora ARM] [IETF Annouce] [Bugtraq] [Linux OMAP] [Linux MIPS] [eCos] [Asterisk Internet PBX] [Linux API]