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Re: [PATCH v4 0/6] virtio core DMA API conversion

From Andy Lutomirski <luto@amacapital.net>
Newsgroups linux.kernel
Subject Re: [PATCH v4 0/6] virtio core DMA API conversion
Date 2015-11-10 06:40 +0100
Message-ID <qt9OW-TO-23@gated-at.bofh.it> (permalink)
References (2 earlier) <qt42S-5vi-23@gated-at.bofh.it> <qt5ii-6fS-3@gated-at.bofh.it> <qt6Ho-7hQ-19@gated-at.bofh.it> <qt6Ho-7hQ-17@gated-at.bofh.it> <qt9OW-TO-25@gated-at.bofh.it>
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On Mon, Nov 9, 2015 at 9:26 PM, Benjamin Herrenschmidt
<benh@kernel.crashing.org> wrote:
> On Mon, 2015-11-09 at 18:18 -0800, Andy Lutomirski wrote:
>>
>> Which leaves the special case of Xen, where even preexisting devices
>> don't bypass the IOMMU.  Can we keep this specific to powerpc and
>> sparc?  On x86, this problem is basically nonexistent, since the IOMMU
>> is properly self-describing.
>>
>> IOW, I think that on x86 we should assume that all virtio devices
>> honor the IOMMU.
>
> You don't like performances ? :-)

This should have basically no effect.  Every non-experimental x86
virtio setup in existence either doesn't work at all (Xen) or has DMA
ops that are no-ops.

--Andy
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Thread

Re: [PATCH v4 0/6] virtio core DMA API conversion "Michael S. Tsirkin" <mst@redhat.com> - 2015-11-09 13:20 +0100
  Re: [PATCH v4 0/6] virtio core DMA API conversion Paolo Bonzini <pbonzini@redhat.com> - 2015-11-09 13:30 +0100
  Re: [PATCH v4 0/6] virtio core DMA API conversion Benjamin Herrenschmidt <benh@kernel.crashing.org> - 2015-11-10 00:30 +0100
    Re: [PATCH v4 0/6] virtio core DMA API conversion Andy Lutomirski <luto@amacapital.net> - 2015-11-10 01:50 +0100
      Re: [PATCH v4 0/6] virtio core DMA API conversion Andy Lutomirski <luto@amacapital.net> - 2015-11-10 03:20 +0100
        Re: [PATCH v4 0/6] virtio core DMA API conversion Benjamin Herrenschmidt <benh@kernel.crashing.org> - 2015-11-10 06:30 +0100
          Re: [PATCH v4 0/6] virtio core DMA API conversion Andy Lutomirski <luto@amacapital.net> - 2015-11-10 06:40 +0100
            Re: [PATCH v4 0/6] virtio core DMA API conversion Benjamin Herrenschmidt <benh@kernel.crashing.org> - 2015-11-10 11:40 +0100
              Re: [PATCH v4 0/6] virtio core DMA API conversion "Michael S. Tsirkin" <mst@redhat.com> - 2015-11-10 13:50 +0100
                Re: [PATCH v4 0/6] virtio core DMA API conversion Benjamin Herrenschmidt <benh@kernel.crashing.org> - 2015-11-10 21:40 +0100
              Re: [PATCH v4 0/6] virtio core DMA API conversion Andy Lutomirski <luto@amacapital.net> - 2015-11-10 20:00 +0100
                Re: [PATCH v4 0/6] virtio core DMA API conversion Benjamin Herrenschmidt <benh@kernel.crashing.org> - 2015-11-10 23:30 +0100
                Re: [PATCH v4 0/6] virtio core DMA API conversion Andy Lutomirski <luto@amacapital.net> - 2015-11-11 00:50 +0100
                Re: [PATCH v4 0/6] virtio core DMA API conversion Benjamin Herrenschmidt <benh@kernel.crashing.org> - 2015-11-11 01:50 +0100
                Re: [PATCH v4 0/6] virtio core DMA API conversion Andy Lutomirski <luto@amacapital.net> - 2015-11-11 05:50 +0100
                Re: [PATCH v4 0/6] virtio core DMA API conversion Benjamin Herrenschmidt <benh@kernel.crashing.org> - 2015-11-11 06:10 +0100
        Re: [PATCH v4 0/6] virtio core DMA API conversion Andy Lutomirski <luto@amacapital.net> - 2015-11-10 06:40 +0100
        Re: [PATCH v4 0/6] virtio core DMA API conversion Benjamin Herrenschmidt <benh@kernel.crashing.org> - 2015-11-10 07:30 +0100
        Re: [PATCH v4 0/6] virtio core DMA API conversion Jan Kiszka <jan.kiszka@siemens.com> - 2015-11-10 09:20 +0100
      Re: [PATCH v4 0/6] virtio core DMA API conversion Benjamin Herrenschmidt <benh@kernel.crashing.org> - 2015-11-10 04:10 +0100
        Re: [PATCH v4 0/6] virtio core DMA API conversion Knut Omang <knut.omang@oracle.com> - 2015-11-10 10:50 +0100
          Re: [PATCH v4 0/6] virtio core DMA API conversion Benjamin Herrenschmidt <benh@kernel.crashing.org> - 2015-11-10 11:50 +0100
        Re: [PATCH v4 0/6] virtio core DMA API conversion Joerg Roedel <jroedel@suse.de> - 2015-11-10 11:30 +0100
          Re: [PATCH v4 0/6] virtio core DMA API conversion Benjamin Herrenschmidt <benh@kernel.crashing.org> - 2015-11-10 20:40 +0100

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