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

From Benjamin Herrenschmidt <benh@kernel.crashing.org>
Newsgroups linux.kernel
Subject Re: [PATCH v4 0/6] virtio core DMA API conversion
Date 2015-11-11 01:50 +0100
Message-ID <qtrLP-3YD-1@gated-at.bofh.it> (permalink)
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On Tue, 2015-11-10 at 15:44 -0800, Andy Lutomirski wrote:
> 
> > What about partition <-> partition virtio such as what we could do on
> > PAPR systems. That would have the weak barrier bit.
> >
> 
> Is it partition <-> partition, bypassing IOMMU?

No.

> I think I'd settle for just something that doesn't regress
> non-experimental setups that actually work today and that allow new
> setups (x86 with fixed QEMU and maybe something more complicated on
> powerpc and/or sparc) to work in all cases.
> 
> We could certainly just make powerpc and sparc continue bypassing the
> IOMMU until someone comes up with a way to fix it.  I'll send out some
> patches that do that, and maybe that'll help this make progress.

But we haven't found a solution that works. All we have come up with is
a quirk that will force bypass on virtio always and will not allow us
to operate non-bypassing devices on either of those architectures in
the future.

I'm not too happy about this.

Ben.

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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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