From: David Gibson <david@gibson.dropbear.id.au>
To: Wei Wang <wei.wang2@amd.com>
Cc: Joerg Roedel <joerg.roedel@amd.com>,
mst@redhat.com, qemu-devel@nongnu.org,
eduard.munteanu@linux360.ro
Subject: Re: [Qemu-devel] [0/13] RFC: Guest visible IOMMU
Date: Fri, 23 Mar 2012 13:02:17 +1100 [thread overview]
Message-ID: <20120323020217.GE9087@truffala.fritz.box> (raw)
In-Reply-To: <4F6B2E21.8000001@amd.com>
On Thu, Mar 22, 2012 at 02:50:25PM +0100, Wei Wang wrote:
> On 03/22/2012 03:14 AM, David Gibson wrote:
> >Here's another version of my series implementing the nevessary
> >framework for emulation of guest-visible IOMMUs. I've incorporated
> >the feedback from the last posting. I'm fairly confident that
> >preliminary patches 1-3 are ready to go in, the rest might still need
> >more consideration.
> >
> >In particular, if anyone has thoughts on how to handle the case where
> >an IOMMU mapping is invalidated by the guest where a qemu-side device
> >currently has that piece of IOVA-space dma_memory_map()ed, I'd be
> >interested to hear it.
> >
> >
> >
>
> Hi David,
> I am Xen developer. Currently I am working on a hardware based iommu
> emulation for amd iommu v2 systems (we need this to enable iommuv2
> drivers in guest OS and therefore to passthroug gpgpu to hvm guest).
> In this work, only a virtual iommu device has to be registered on
> qemu bus and dma translations are still performed by iommu hardware.
> So I wonder if it is possible that I could integrate my work with
> yours. I had a proof-of-concept patch for qemu:
>
> http://lists.xen.org/archives/html/xen-devel/2011-12/msg01269.html
>
> my last post was:
> http://lists.xen.org/archives/html/xen-devel/2012-03/msg00591.html
I'd be very glad to see AMD IOMMU support integrated with my
infrastructure. Eduard - Gabriel's original patch series included an
AMD IOMMU emulation, but since I'm not really familiar with that
IOMMU, and don't have the hardware to test it, I didn't feel confident
to attempt porting it to my new infrastructure.
I notice that you seem to be aiming mostly at pass-through.
Pass-through has some complications of its own - this patch series was
aimed firstly at IOMMU emulation, although I'm also concerned with
pass-through (we're currently struggling with how best to handle
pass-through for pSeries machines).
--
David Gibson | I'll have my music baroque, and my code
david AT gibson.dropbear.id.au | minimalist, thank you. NOT _the_ _other_
| _way_ _around_!
http://www.ozlabs.org/~dgibson
prev parent reply other threads:[~2012-03-23 2:20 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-03-22 2:14 [Qemu-devel] [0/13] RFC: Guest visible IOMMU David Gibson
2012-03-22 2:14 ` [Qemu-devel] [PATCH 01/13] Use DMADirection type for dma_bdrv_io David Gibson
2012-03-22 2:14 ` [Qemu-devel] [PATCH 02/13] Better support for dma_addr_t variables David Gibson
2012-03-22 2:14 ` [Qemu-devel] [PATCH 03/13] usb-xhci: Use PCI DMA helper functions David Gibson
2012-03-22 10:00 ` Gerd Hoffmann
2012-03-23 2:05 ` David Gibson
2012-03-22 2:14 ` [Qemu-devel] [PATCH 04/13] Implement cpu_physical_memory_zero() David Gibson
2012-03-22 2:14 ` [Qemu-devel] [PATCH 05/13] iommu: Add universal DMA helper functions David Gibson
2012-03-22 2:14 ` [Qemu-devel] [PATCH 06/13] usb-ohci: Use " David Gibson
2012-03-22 10:01 ` Gerd Hoffmann
2012-03-22 2:14 ` [Qemu-devel] [PATCH 07/13] iommu: Make sglists and dma_bdrv helpers use new universal DMA helpers David Gibson
2012-03-22 2:14 ` [Qemu-devel] [PATCH 08/13] ide/ahci: Use universal DMA helper functions David Gibson
2012-03-22 2:14 ` [Qemu-devel] [PATCH 09/13] usb: Convert usb_packet_{map, unmap} to universal DMA helpers David Gibson
2012-03-22 2:14 ` [Qemu-devel] [PATCH 10/13] iommu: Introduce IOMMU emulation infrastructure David Gibson
2012-03-22 2:14 ` [Qemu-devel] [PATCH 11/13] pseries: Convert sPAPR TCEs to use generic IOMMU infrastructure David Gibson
2012-03-22 2:14 ` [Qemu-devel] [PATCH 12/13] iommu: Allow PCI to use " David Gibson
2012-03-22 2:14 ` [Qemu-devel] [PATCH 13/13] pseries: Implement IOMMU and DMA for PAPR PCI devices David Gibson
2012-03-22 13:50 ` [Qemu-devel] [0/13] RFC: Guest visible IOMMU Wei Wang
2012-03-23 2:02 ` David Gibson [this message]
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