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[Qemu-devel] Re: [PATCH v3 1/1] Shared memory uio_pci driver
From: |
Michael S. Tsirkin |
Subject: |
[Qemu-devel] Re: [PATCH v3 1/1] Shared memory uio_pci driver |
Date: |
Thu, 25 Mar 2010 18:40:52 +0200 |
User-agent: |
Mutt/1.5.19 (2009-01-05) |
On Thu, Mar 25, 2010 at 06:32:15PM +0200, Avi Kivity wrote:
> On 03/25/2010 06:23 PM, Anthony Liguori wrote:
>>> There has been previous discussion of virtio, however while virtio is
>>> good for exporting guest memory, it's not ideal for importing memory
>>> into a guest.
>>
>> virtio is a DMA-based API which means that it doesn't assume cache
>> coherent shared memory. The PCI transport takes advantage of cache
>> coherent shared memory but it's not strictly required.
>
> Aren't we violating this by not using dma_alloc_coherent() for the queues?
I don't see what changing this would buys us though, unless
a non-cache coherent architecture implements kvm.
TCG runs everything on a single processor so there are
no cache coherency issues.
> --
> error compiling committee.c: too many arguments to function
- [Qemu-devel] Re: [PATCH v3 1/1] Shared memory uio_pci driver, (continued)
[Qemu-devel] Re: [PATCH v3 1/1] Shared memory uio_pci driver, Michael S. Tsirkin, 2010/03/25
[Qemu-devel] Re: [PATCH v3 1/1] Shared memory uio_pci driver, Cam Macdonell, 2010/03/25
[Qemu-devel] Re: [PATCH v3 1/1] Shared memory uio_pci driver, Michael S. Tsirkin, 2010/03/25
[Qemu-devel] Re: [PATCH v3 1/1] Shared memory uio_pci driver, Avi Kivity, 2010/03/25
- [Qemu-devel] Re: [PATCH v3 1/1] Shared memory uio_pci driver, Cam Macdonell, 2010/03/25
- [Qemu-devel] Re: [PATCH v3 1/1] Shared memory uio_pci driver, Avi Kivity, 2010/03/25
- [Qemu-devel] Re: [PATCH v3 1/1] Shared memory uio_pci driver, Cam Macdonell, 2010/03/26
- [Qemu-devel] Re: [PATCH v3 1/1] Shared memory uio_pci driver, Avi Kivity, 2010/03/27
- [Qemu-devel] Re: [PATCH v3 1/1] Shared memory uio_pci driver, Michael S. Tsirkin, 2010/03/28
- [Qemu-devel] Re: [PATCH v3 1/1] Shared memory uio_pci driver, Avi Kivity, 2010/03/28
- [Qemu-devel] Re: [PATCH v3 1/1] Shared memory uio_pci driver, Michael S. Tsirkin, 2010/03/28