From: David Woodhouse <dwmw2@infradead.org>
To: Joerg Roedel <joerg.roedel@amd.com>
Cc: iommu@lists.linux-foundation.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH 0/8] Passthrough support for AMD-IOMMU (AMD-Vi)
Date: Mon, 07 Sep 2009 13:54:30 +0100 [thread overview]
Message-ID: <1252328070.4483.569.camel@macbook.infradead.org> (raw)
In-Reply-To: <1252056994-31980-1-git-send-email-joerg.roedel@amd.com>
On Fri, 2009-09-04 at 11:36 +0200, Joerg Roedel wrote:
>
> this series of patches implement iommu=pt support for AMD IOMMU (AMD-Vi). If
> this option is passed on the kernel command line, the AMD-Vi driver will not
> register itself as the dma_ops backend and allows all devices unlimited access
> to main memory as long as no other kernel part (currently only KVM will do so)
> assigns the device to another domain using the IOMMU-API.
The Intel IOMMU used to behave like that in passthrough mode, but I've
now changed it. Now, it will still register itself as the dma_ops
backend, and it won't actually bypass the IOMMU for devices with a
limited dma_mask. So you don't end up having to use swiotlb for those
(which wasn't working anyway, iirc).
The devices for which you actually care about performance are still
going to end up with the passthrough mapping as you desire, anyway.
--
David Woodhouse Open Source Technology Centre
David.Woodhouse@intel.com Intel Corporation
prev parent reply other threads:[~2009-09-07 12:54 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-09-04 9:36 Joerg Roedel
2009-09-04 9:36 ` [PATCH 1/8] x86/dma: Mark iommu_pass_through as __read_mostly Joerg Roedel
2009-09-04 9:36 ` [PATCH 2/8] x86/amd-iommu: Add core functions for pd allocation/freeing Joerg Roedel
2009-09-04 9:36 ` [PATCH 3/8] x86/amd-iommu: Add passthrough mode initialization functions Joerg Roedel
2009-09-04 9:36 ` [PATCH 4/8] x86/amd-iommu: Fix device table write order Joerg Roedel
2009-09-04 9:36 ` [PATCH 5/8] x86/amd-iommu: Align locking between attach_device and detach_device Joerg Roedel
2009-09-04 9:36 ` [PATCH 6/8] x86/amd-iommu: Make sure a device is assigned in passthrough mode Joerg Roedel
2009-09-04 9:36 ` [PATCH 7/8] x86/amd-iommu: Don't detach device from pt domain on driver unbind Joerg Roedel
2009-09-04 9:36 ` [PATCH 8/8] x86/amd-iommu: Initialize passthrough mode when requested Joerg Roedel
2009-09-07 12:54 ` David Woodhouse [this message]
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