From: Paul Brook <paul@codesourcery.com>
To: Anthony Liguori <anthony@codemonkey.ws>
Cc: qemu-devel@nongnu.org, Joerg Roedel <joro@8bytes.org>,
avi@redhat.com, kvm@vger.kernel.org,
"Eduard - Gabriel Munteanu" <eduard.munteanu@linux360.ro>
Subject: Re: [Qemu-devel] Re: [RFC PATCH 4/7] ide: IOMMU support
Date: Thu, 15 Jul 2010 11:33:14 +0100 [thread overview]
Message-ID: <201007151133.14493.paul@codesourcery.com> (raw)
In-Reply-To: <4C3E2C2E.70507@codemonkey.ws>
> > Depending how the we decide to handle IOMMU invalidation, it may also be
> > necessary to augment the memory_map API to allow the system to request a
> > mapping be revoked. However this issue is not specific to the IOMMU
> > implementation. Such bugs are already present on any system that allows
> > dynamic reconfiguration of the address space, e.g. by changing PCI BARs.
>
> That's why the memory_map API today does not allow mappings to persist
> after trips back to the main loop.
Sure it does. If you can't combine zero-copy memory access with asynchronous
IO then IMO it's fairly useless. See e.g. dma-helpers.c
Paul
WARNING: multiple messages have this Message-ID (diff)
From: Paul Brook <paul@codesourcery.com>
To: Anthony Liguori <anthony@codemonkey.ws>
Cc: Joerg Roedel <joro@8bytes.org>,
Eduard - Gabriel Munteanu <eduard.munteanu@linux360.ro>,
qemu-devel@nongnu.org, kvm@vger.kernel.org, avi@redhat.com
Subject: Re: [Qemu-devel] Re: [RFC PATCH 4/7] ide: IOMMU support
Date: Thu, 15 Jul 2010 11:33:14 +0100 [thread overview]
Message-ID: <201007151133.14493.paul@codesourcery.com> (raw)
In-Reply-To: <4C3E2C2E.70507@codemonkey.ws>
> > Depending how the we decide to handle IOMMU invalidation, it may also be
> > necessary to augment the memory_map API to allow the system to request a
> > mapping be revoked. However this issue is not specific to the IOMMU
> > implementation. Such bugs are already present on any system that allows
> > dynamic reconfiguration of the address space, e.g. by changing PCI BARs.
>
> That's why the memory_map API today does not allow mappings to persist
> after trips back to the main loop.
Sure it does. If you can't combine zero-copy memory access with asynchronous
IO then IMO it's fairly useless. See e.g. dma-helpers.c
Paul
next prev parent reply other threads:[~2010-07-15 10:33 UTC|newest]
Thread overview: 83+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-07-14 5:45 [RFC PATCH 0/7] AMD IOMMU emulation patchset Eduard - Gabriel Munteanu
2010-07-14 5:45 ` [Qemu-devel] " Eduard - Gabriel Munteanu
2010-07-14 5:45 ` [RFC PATCH 1/7] Generic IOMMU layer Eduard - Gabriel Munteanu
2010-07-14 5:45 ` [Qemu-devel] " Eduard - Gabriel Munteanu
2010-07-14 6:07 ` malc
2010-07-14 6:07 ` [Qemu-devel] " malc
2010-07-14 22:47 ` Eduard - Gabriel Munteanu
2010-07-14 22:47 ` Eduard - Gabriel Munteanu
2010-07-14 5:45 ` [RFC PATCH 2/7] AMD IOMMU emulation Eduard - Gabriel Munteanu
2010-07-14 5:45 ` [Qemu-devel] " Eduard - Gabriel Munteanu
2010-07-14 20:16 ` Paul Brook
2010-07-14 20:16 ` Paul Brook
2010-07-14 5:45 ` [RFC PATCH 3/7] pci: call IOMMU hooks Eduard - Gabriel Munteanu
2010-07-14 5:45 ` [Qemu-devel] " Eduard - Gabriel Munteanu
2010-07-14 7:37 ` Isaku Yamahata
2010-07-14 7:37 ` Isaku Yamahata
2010-07-14 22:50 ` Eduard - Gabriel Munteanu
2010-07-14 22:50 ` Eduard - Gabriel Munteanu
2010-07-14 5:45 ` [RFC PATCH 4/7] ide: IOMMU support Eduard - Gabriel Munteanu
2010-07-14 5:45 ` [Qemu-devel] " Eduard - Gabriel Munteanu
2010-07-14 13:53 ` Paul Brook
2010-07-14 13:53 ` [Qemu-devel] " Paul Brook
2010-07-14 18:33 ` Joerg Roedel
2010-07-14 18:33 ` [Qemu-devel] " Joerg Roedel
2010-07-14 20:13 ` Paul Brook
2010-07-14 21:29 ` Anthony Liguori
2010-07-14 21:29 ` Anthony Liguori
2010-07-14 22:24 ` Chris Wright
2010-07-14 22:24 ` Chris Wright
2010-07-15 10:28 ` Paul Brook
2010-07-15 10:28 ` Paul Brook
2010-07-15 16:52 ` Chris Wright
2010-07-15 16:52 ` Chris Wright
2010-07-15 17:02 ` Avi Kivity
2010-07-15 17:02 ` Avi Kivity
2010-07-15 17:17 ` Chris Wright
2010-07-15 17:17 ` Chris Wright
2010-07-15 17:22 ` Avi Kivity
2010-07-15 17:22 ` Avi Kivity
2010-07-15 17:25 ` Chris Wright
2010-07-15 17:25 ` Chris Wright
2010-07-15 17:27 ` Eduard - Gabriel Munteanu
2010-07-15 17:27 ` Eduard - Gabriel Munteanu
2010-07-15 17:22 ` Joerg Roedel
2010-07-15 17:22 ` Joerg Roedel
2010-07-15 17:14 ` Chris Wright
2010-07-15 17:14 ` Chris Wright
2010-07-15 9:10 ` Joerg Roedel
2010-07-15 9:10 ` Joerg Roedel
2010-07-15 12:45 ` Anthony Liguori
2010-07-15 12:45 ` Anthony Liguori
2010-07-15 14:45 ` Joerg Roedel
2010-07-15 14:45 ` Joerg Roedel
2010-07-15 16:45 ` Eduard - Gabriel Munteanu
2010-07-15 16:45 ` Eduard - Gabriel Munteanu
2010-07-15 17:42 ` Anthony Liguori
2010-07-15 17:42 ` Anthony Liguori
2010-07-15 10:33 ` Paul Brook [this message]
2010-07-15 10:33 ` Paul Brook
2010-07-15 12:42 ` Anthony Liguori
2010-07-15 12:42 ` Anthony Liguori
2010-07-15 14:02 ` Paul Brook
2010-07-15 14:02 ` Paul Brook
2010-07-14 23:39 ` Eduard - Gabriel Munteanu
2010-07-14 23:39 ` Eduard - Gabriel Munteanu
2010-07-15 9:22 ` Joerg Roedel
2010-07-15 9:22 ` Joerg Roedel
2010-07-15 10:49 ` Paul Brook
2010-07-15 10:49 ` Paul Brook
2010-07-15 14:59 ` Joerg Roedel
2010-07-15 14:59 ` Joerg Roedel
2010-07-14 23:11 ` Eduard - Gabriel Munteanu
2010-07-14 23:11 ` [Qemu-devel] " Eduard - Gabriel Munteanu
2010-07-15 10:58 ` Paul Brook
2010-07-15 10:58 ` [Qemu-devel] " Paul Brook
2010-07-14 5:45 ` [RFC PATCH 5/7] rtl8139: " Eduard - Gabriel Munteanu
2010-07-14 5:45 ` [Qemu-devel] " Eduard - Gabriel Munteanu
2010-07-14 5:45 ` [RFC PATCH 6/7] eepro100: " Eduard - Gabriel Munteanu
2010-07-14 5:45 ` [Qemu-devel] " Eduard - Gabriel Munteanu
2010-07-14 5:45 ` [RFC PATCH 7/7] ac97: " Eduard - Gabriel Munteanu
2010-07-14 5:45 ` [Qemu-devel] " Eduard - Gabriel Munteanu
2010-07-14 6:09 ` malc
2010-07-14 6:09 ` [Qemu-devel] " malc
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