From: Paul Brook <paul@codesourcery.com>
To: Chris Wright <chrisw@sous-sol.org>
Cc: kvm@vger.kernel.org, Joerg Roedel <joro@8bytes.org>,
qemu-devel@nongnu.org, avi@redhat.com,
Eduard - Gabriel Munteanu <eduard.munteanu@linux360.ro>
Subject: Re: [Qemu-devel] Re: [RFC PATCH 4/7] ide: IOMMU support
Date: Thu, 15 Jul 2010 11:28:26 +0100 [thread overview]
Message-ID: <201007151128.27487.paul@codesourcery.com> (raw)
In-Reply-To: <20100714222401.GB21126@sequoia.sous-sol.org>
> > The right approach IMHO is to convert devices to use bus-specific
> > functions to access memory. The bus specific functions should have
> > a device argument as the first parameter.
>
> As for ATS, the internal api to handle the device's dma reqeust needs
> a notion of a translated vs. an untranslated request. IOW, if qemu ever
> had a device with ATS support, the device would use its local cache to
> translate the dma address and then submit a translated request to the
> pci bus (effectively doing a raw cpu physical memory* in that case).
Really? Can you provide an documentation to support this claim?
My impression is that there is no difference between translated and
untranslated devices, and the translation is explicitly disabled by software.
Paul
next prev parent reply other threads:[~2010-07-15 10:28 UTC|newest]
Thread overview: 42+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-07-14 5:45 [Qemu-devel] [RFC PATCH 0/7] AMD IOMMU emulation patchset Eduard - Gabriel Munteanu
2010-07-14 5:45 ` [Qemu-devel] [RFC PATCH 1/7] Generic IOMMU layer Eduard - Gabriel Munteanu
2010-07-14 6:07 ` malc
2010-07-14 22:47 ` Eduard - Gabriel Munteanu
2010-07-14 5:45 ` [Qemu-devel] [RFC PATCH 2/7] AMD IOMMU emulation Eduard - Gabriel Munteanu
2010-07-14 20:16 ` Paul Brook
2010-07-14 5:45 ` [Qemu-devel] [RFC PATCH 3/7] pci: call IOMMU hooks Eduard - Gabriel Munteanu
2010-07-14 7:37 ` Isaku Yamahata
2010-07-14 22:50 ` Eduard - Gabriel Munteanu
2010-07-14 5:45 ` [Qemu-devel] [RFC PATCH 4/7] ide: IOMMU support Eduard - Gabriel Munteanu
2010-07-14 13:53 ` [Qemu-devel] " Paul Brook
2010-07-14 18:33 ` Joerg Roedel
2010-07-14 20:13 ` Paul Brook
2010-07-14 21:29 ` Anthony Liguori
2010-07-14 22:24 ` Chris Wright
2010-07-15 10:28 ` Paul Brook [this message]
2010-07-15 16:52 ` Chris Wright
2010-07-15 17:02 ` Avi Kivity
2010-07-15 17:17 ` Chris Wright
2010-07-15 17:22 ` Avi Kivity
2010-07-15 17:25 ` Chris Wright
2010-07-15 17:27 ` Eduard - Gabriel Munteanu
2010-07-15 17:22 ` Joerg Roedel
2010-07-15 17:14 ` Chris Wright
2010-07-15 9:10 ` Joerg Roedel
2010-07-15 12:45 ` Anthony Liguori
2010-07-15 14:45 ` Joerg Roedel
2010-07-15 16:45 ` Eduard - Gabriel Munteanu
2010-07-15 17:42 ` Anthony Liguori
2010-07-15 10:33 ` Paul Brook
2010-07-15 12:42 ` Anthony Liguori
2010-07-15 14:02 ` Paul Brook
2010-07-14 23:39 ` Eduard - Gabriel Munteanu
2010-07-15 9:22 ` Joerg Roedel
2010-07-15 10:49 ` Paul Brook
2010-07-15 14:59 ` Joerg Roedel
2010-07-14 23:11 ` Eduard - Gabriel Munteanu
2010-07-15 10:58 ` Paul Brook
2010-07-14 5:45 ` [Qemu-devel] [RFC PATCH 5/7] rtl8139: " Eduard - Gabriel Munteanu
2010-07-14 5:45 ` [Qemu-devel] [RFC PATCH 6/7] eepro100: " Eduard - Gabriel Munteanu
2010-07-14 5:45 ` [Qemu-devel] [RFC PATCH 7/7] ac97: " Eduard - Gabriel Munteanu
2010-07-14 6:09 ` malc
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