From: Benjamin Herrenschmidt <benh@kernel.crashing.org>
To: Andy Lutomirski <luto@amacapital.net>
Cc: Christian Borntraeger <borntraeger@de.ibm.com>,
Paolo Bonzini <pbonzini@redhat.com>,
David Woodhouse <dwmw2@infradead.org>,
Martin Schwidefsky <schwidefsky@de.ibm.com>,
"Michael S. Tsirkin" <mst@redhat.com>,
Sebastian Ott <sebott@linux.vnet.ibm.com>,
"David S. Miller" <davem@davemloft.net>,
linux-s390 <linux-s390@vger.kernel.org>,
Cornelia Huck <cornelia.huck@de.ibm.com>,
Joerg Roedel <jroedel@suse.de>, KVM <kvm@vger.kernel.org>,
Christoph Hellwig <hch@lst.de>,
Linux Virtualization <virtualization@lists.linux-foundation.org>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
sparclinux@vger.kernel.org
Subject: Re: [PATCH v4 0/6] virtio core DMA API conversion
Date: Wed, 11 Nov 2015 11:44:42 +1100 [thread overview]
Message-ID: <1447202682.31884.123.camel@kernel.crashing.org> (raw)
In-Reply-To: <CALCETrWb9poeyxXhcbAbQkpcP-XYjWtz2w9iSPkKJH8rdzAj-A@mail.gmail.com>
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.
next prev parent reply other threads:[~2015-11-11 0:45 UTC|newest]
Thread overview: 38+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-10-30 1:09 [PATCH v4 0/6] virtio core DMA API conversion Andy Lutomirski
2015-10-30 1:09 ` [PATCH v4 1/6] virtio-net: Stop doing DMA from the stack Andy Lutomirski
2015-10-30 13:55 ` Christian Borntraeger
2015-10-31 5:02 ` Andy Lutomirski
2015-10-30 1:09 ` [PATCH v4 2/6] virtio_ring: Support DMA APIs Andy Lutomirski
2015-10-30 12:01 ` Cornelia Huck
2015-10-30 12:05 ` Christian Borntraeger
2015-10-30 18:51 ` Andy Lutomirski
2015-10-30 1:09 ` [PATCH v4 3/6] virtio_pci: Use the DMA API Andy Lutomirski
2015-10-30 1:09 ` [PATCH v4 4/6] virtio: Add improved queue allocation API Andy Lutomirski
2015-10-30 1:09 ` [PATCH v4 5/6] virtio_mmio: Use the DMA API Andy Lutomirski
2015-10-30 1:09 ` [PATCH v4 6/6] virtio_pci: " Andy Lutomirski
2015-10-30 1:17 ` [PATCH v4 0/6] virtio core DMA API conversion Andy Lutomirski
2015-10-30 9:57 ` Christian Borntraeger
2015-11-09 12:15 ` Michael S. Tsirkin
2015-11-09 12:27 ` Paolo Bonzini
2015-11-09 22:58 ` Benjamin Herrenschmidt
2015-11-10 0:46 ` Andy Lutomirski
2015-11-10 2:04 ` Benjamin Herrenschmidt
2015-11-10 2:18 ` Andy Lutomirski
2015-11-10 5:26 ` Benjamin Herrenschmidt
2015-11-10 5:33 ` Andy Lutomirski
2015-11-10 5:28 ` Benjamin Herrenschmidt
2015-11-10 5:35 ` Andy Lutomirski
2015-11-10 10:37 ` Benjamin Herrenschmidt
2015-11-10 12:43 ` Michael S. Tsirkin
2015-11-10 19:37 ` Benjamin Herrenschmidt
2015-11-10 18:54 ` Andy Lutomirski
2015-11-10 22:27 ` Benjamin Herrenschmidt
2015-11-10 23:44 ` Andy Lutomirski
2015-11-11 0:44 ` Benjamin Herrenschmidt [this message]
2015-11-11 4:46 ` Andy Lutomirski
2015-11-11 5:08 ` Benjamin Herrenschmidt
2015-11-10 7:28 ` Jan Kiszka
2015-11-10 9:45 ` Knut Omang
2015-11-10 10:26 ` Benjamin Herrenschmidt
2015-11-10 10:27 ` Joerg Roedel
2015-11-10 19:36 ` Benjamin Herrenschmidt
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