From: Andy Lutomirski <luto@amacapital.net>
To: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Andy Lutomirski <luto@kernel.org>,
David Woodhouse <dwmw2@infradead.org>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
"David S. Miller" <davem@davemloft.net>,
sparclinux@vger.kernel.org, Joerg Roedel <jroedel@suse.de>,
Christian Borntraeger <borntraeger@de.ibm.com>,
Cornelia Huck <cornelia.huck@de.ibm.com>,
Sebastian Ott <sebott@linux.vnet.ibm.com>,
Paolo Bonzini <pbonzini@redhat.com>,
Christoph Hellwig <hch@lst.de>, KVM <kvm@vger.kernel.org>,
Martin Schwidefsky <schwidefsky@de.ibm.com>,
linux-s390 <linux-s390@vger.kernel.org>,
Linux Virtualization <virtualization@lists.linux-foundation.org>,
"Michael S. Tsirkin" <mst@redhat.com>
Subject: Re: [PATCH v4 0/6] virtio core DMA API conversion
Date: Mon, 9 Nov 2015 21:33:07 -0800 [thread overview]
Message-ID: <CALCETrVopuN6s7ZTa4ZRe1E1wPiWy_2gMR_OH2B2rK0+VdeWVg@mail.gmail.com> (raw)
In-Reply-To: <1447133190.31884.65.camel@kernel.crashing.org>
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
WARNING: multiple messages have this Message-ID (diff)
From: Andy Lutomirski <luto@amacapital.net>
To: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Andy Lutomirski <luto@kernel.org>,
David Woodhouse <dwmw2@infradead.org>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
"David S. Miller" <davem@davemloft.net>,
sparclinux@vger.kernel.org, Joerg Roedel <jroedel@suse.de>,
Christian Borntraeger <borntraeger@de.ibm.com>,
Cornelia Huck <cornelia.huck@de.ibm.com>,
Sebastian Ott <sebott@linux.vnet.ibm.com>,
Paolo Bonzini <pbonzini@redhat.com>,
Christoph Hellwig <hch@lst.de>, KVM <kvm@vger.kernel.org>,
Martin Schwidefsky <schwidefsky@de.ibm.com>,
linux-s390 <linux-s390@vger.kernel.org>,
Linux Virtualization <virtualization@lists.linux-foundation.org>,
"Michael S. Tsirkin" <mst@redhat.com>
Subject: Re: [PATCH v4 0/6] virtio core DMA API conversion
Date: Tue, 10 Nov 2015 05:33:07 +0000 [thread overview]
Message-ID: <CALCETrVopuN6s7ZTa4ZRe1E1wPiWy_2gMR_OH2B2rK0+VdeWVg@mail.gmail.com> (raw)
In-Reply-To: <1447133190.31884.65.camel@kernel.crashing.org>
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
next prev parent reply other threads:[~2015-11-10 5:33 UTC|newest]
Thread overview: 116+ 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 ` Andy Lutomirski
2015-10-30 1:09 ` [PATCH v4 1/6] virtio-net: Stop doing DMA from the stack Andy Lutomirski
2015-10-30 1:09 ` Andy Lutomirski
2015-10-30 1:09 ` Andy Lutomirski
2015-10-30 13:55 ` Christian Borntraeger
2015-10-30 13:55 ` Christian Borntraeger
2015-10-31 5:02 ` Andy Lutomirski
2015-10-31 5:02 ` Andy Lutomirski
2015-10-31 5:02 ` Andy Lutomirski
2015-10-30 13:55 ` Christian Borntraeger
2015-10-30 1:09 ` [PATCH v4 2/6] virtio_ring: Support DMA APIs Andy Lutomirski
2015-10-30 1:09 ` Andy Lutomirski
2015-10-30 12:01 ` Cornelia Huck
2015-10-30 12:01 ` Cornelia Huck
2015-10-30 12:01 ` Cornelia Huck
2015-10-30 12:05 ` Christian Borntraeger
2015-10-30 12:05 ` Christian Borntraeger
2015-10-30 12:05 ` Christian Borntraeger
2015-10-30 18:51 ` Andy Lutomirski
2015-10-30 18:51 ` Andy Lutomirski
2015-10-30 18:51 ` Andy Lutomirski
2015-10-30 1:09 ` Andy Lutomirski
2015-10-30 1:09 ` [PATCH v4 3/6] virtio_pci: Use the DMA API Andy Lutomirski
2015-10-30 1:09 ` Andy Lutomirski
2015-10-30 1:09 ` Andy Lutomirski
2015-10-30 1:09 ` [PATCH v4 4/6] virtio: Add improved queue allocation API Andy Lutomirski
2015-10-30 1:09 ` Andy Lutomirski
2015-10-30 1:09 ` Andy Lutomirski
2015-10-30 1:09 ` [PATCH v4 5/6] virtio_mmio: Use the DMA API Andy Lutomirski
2015-10-30 1:09 ` Andy Lutomirski
2015-10-30 1:09 ` Andy Lutomirski
2015-10-30 1:09 ` [PATCH v4 6/6] virtio_pci: " Andy Lutomirski
2015-10-30 1:09 ` Andy Lutomirski
2015-10-30 1:09 ` Andy Lutomirski
2015-10-30 1:17 ` [PATCH v4 0/6] virtio core DMA API conversion Andy Lutomirski
2015-10-30 1:17 ` Andy Lutomirski
2015-10-30 1:17 ` Andy Lutomirski
2015-10-30 9:57 ` Christian Borntraeger
2015-10-30 9:57 ` Christian Borntraeger
2015-10-30 9:57 ` Christian Borntraeger
2015-11-09 12:15 ` Michael S. Tsirkin
2015-11-09 12:15 ` Michael S. Tsirkin
2015-11-09 12:15 ` Michael S. Tsirkin
2015-11-09 12:27 ` Paolo Bonzini
2015-11-09 12:27 ` Paolo Bonzini
2015-11-09 12:27 ` Paolo Bonzini
2015-11-09 22:58 ` Benjamin Herrenschmidt
2015-11-09 22:58 ` Benjamin Herrenschmidt
2015-11-09 22:58 ` Benjamin Herrenschmidt
2015-11-10 0:46 ` Andy Lutomirski
2015-11-10 0:46 ` Andy Lutomirski
2015-11-10 0:46 ` Andy Lutomirski
2015-11-10 2:04 ` Benjamin Herrenschmidt
2015-11-10 2:04 ` Benjamin Herrenschmidt
2015-11-10 2:04 ` Benjamin Herrenschmidt
2015-11-10 2:18 ` Andy Lutomirski
2015-11-10 2:18 ` Andy Lutomirski
2015-11-10 2:18 ` Andy Lutomirski
2015-11-10 5:26 ` Benjamin Herrenschmidt
2015-11-10 5:26 ` Benjamin Herrenschmidt
2015-11-10 5:26 ` Benjamin Herrenschmidt
2015-11-10 5:33 ` Andy Lutomirski
2015-11-10 5:33 ` Andy Lutomirski [this message]
2015-11-10 5:33 ` Andy Lutomirski
2015-11-10 5:28 ` Benjamin Herrenschmidt
2015-11-10 5:28 ` Benjamin Herrenschmidt
2015-11-10 5:28 ` Benjamin Herrenschmidt
2015-11-10 5:35 ` Andy Lutomirski
2015-11-10 5:35 ` Andy Lutomirski
2015-11-10 5:35 ` Andy Lutomirski
2015-11-10 10:37 ` Benjamin Herrenschmidt
2015-11-10 10:37 ` Benjamin Herrenschmidt
2015-11-10 10:37 ` Benjamin Herrenschmidt
2015-11-10 12:43 ` Michael S. Tsirkin
2015-11-10 12:43 ` Michael S. Tsirkin
2015-11-10 12:43 ` Michael S. Tsirkin
2015-11-10 19:37 ` Benjamin Herrenschmidt
2015-11-10 19:37 ` Benjamin Herrenschmidt
2015-11-10 19:37 ` Benjamin Herrenschmidt
2015-11-10 12:43 ` Michael S. Tsirkin
2015-11-10 18:54 ` Andy Lutomirski
2015-11-10 18:54 ` Andy Lutomirski
2015-11-10 18:54 ` Andy Lutomirski
2015-11-10 22:27 ` Benjamin Herrenschmidt
2015-11-10 22:27 ` Benjamin Herrenschmidt
2015-11-10 22:27 ` Benjamin Herrenschmidt
2015-11-10 23:44 ` Andy Lutomirski
2015-11-10 23:44 ` Andy Lutomirski
2015-11-10 23:44 ` Andy Lutomirski
2015-11-11 0:44 ` Benjamin Herrenschmidt
2015-11-11 0:44 ` Benjamin Herrenschmidt
2015-11-11 0:44 ` Benjamin Herrenschmidt
2015-11-11 4:46 ` Andy Lutomirski
2015-11-11 4:46 ` Andy Lutomirski
2015-11-11 4:46 ` Andy Lutomirski
2015-11-11 5:08 ` Benjamin Herrenschmidt
2015-11-11 5:08 ` Benjamin Herrenschmidt
2015-11-11 5:08 ` Benjamin Herrenschmidt
2015-11-10 7:28 ` Jan Kiszka
2015-11-10 7:28 ` Jan Kiszka
2015-11-10 7:28 ` Jan Kiszka
2015-11-10 7:28 ` Jan Kiszka
2015-11-10 9:45 ` Knut Omang
2015-11-10 9:45 ` Knut Omang
2015-11-10 9:45 ` Knut Omang
2015-11-10 10:26 ` Benjamin Herrenschmidt
2015-11-10 10:26 ` Benjamin Herrenschmidt
2015-11-10 10:26 ` Benjamin Herrenschmidt
2015-11-10 10:27 ` Joerg Roedel
2015-11-10 10:27 ` Joerg Roedel
2015-11-10 10:27 ` Joerg Roedel
2015-11-10 19:36 ` Benjamin Herrenschmidt
2015-11-10 19:36 ` Benjamin Herrenschmidt
2015-11-10 19:36 ` Benjamin Herrenschmidt
-- strict thread matches above, loose matches on Subject: below --
2015-10-30 1:09 Andy Lutomirski
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