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Re: [Qemu-devel] [RFC PATCH] vfio: VFIO PCI driver for Qemu
From: |
Avi Kivity |
Subject: |
Re: [Qemu-devel] [RFC PATCH] vfio: VFIO PCI driver for Qemu |
Date: |
Thu, 26 Jul 2012 11:35:47 +0300 |
User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:13.0) Gecko/20120615 Thunderbird/13.0.1 |
On 07/25/2012 10:53 PM, Alex Williamson wrote:
> On Wed, 2012-07-25 at 22:30 +0300, Avi Kivity wrote:
>> On 07/25/2012 08:03 PM, Alex Williamson wrote:
>> > This adds PCI based device assignment to Qemu using the Linux VFIO
>> > userspace driver interface. After setting up VFIO device access,
>> > devices can be added to Qemu guests using the vfio-pci device
>> > option:
>> >
>> > -device vfio-pci,host=1:10.1,id=net0
>> >
>> >
>>
>> Let's use the same syntax as for kvm device assignment. Then we can
>> fall back on kvm when vfio is not available. We can also have an
>> optional parameter kernel-driver to explicitly select vfio or kvm.
>
> This seems confusing to me, pci-assign already has options like
> prefer_msi, share_intx, and configfd that vfio doesn't. I'm sure vfio
> will eventually get options that pci-assign won't have. How is a user
> supposed to figure out what options are actually available from -device
> pci-assign,?
Read the documentation.
> Isn't this the same as asking to drop all model specific
> devices and just use -device net,model=e1000... hey, we've been there
> before ;) Thanks,
It's not. e1000 is a guest visible feature. vfio and kvm assignment do
exactly the same thing, as far as the guest is concerned, just using a
different driver. This is more akin to -device virtio-net,vhost=on|off
(where we also have a default and a fallback, which wouldn't make sense
for model=e1000).
--
error compiling committee.c: too many arguments to function
- [Qemu-devel] [RFC PATCH] vfio: VFIO PCI driver for Qemu, Alex Williamson, 2012/07/25
- Re: [Qemu-devel] [RFC PATCH] vfio: VFIO PCI driver for Qemu, Avi Kivity, 2012/07/25
- Re: [Qemu-devel] [RFC PATCH] vfio: VFIO PCI driver for Qemu, Alex Williamson, 2012/07/25
- Re: [Qemu-devel] [RFC PATCH] vfio: VFIO PCI driver for Qemu,
Avi Kivity <=
- Re: [Qemu-devel] [RFC PATCH] vfio: VFIO PCI driver for Qemu, Alex Williamson, 2012/07/26
- Re: [Qemu-devel] [RFC PATCH] vfio: VFIO PCI driver for Qemu, Avi Kivity, 2012/07/26
- Re: [Qemu-devel] [RFC PATCH] vfio: VFIO PCI driver for Qemu, Alex Williamson, 2012/07/26
- Re: [Qemu-devel] [RFC PATCH] vfio: VFIO PCI driver for Qemu, Avi Kivity, 2012/07/26
- Re: [Qemu-devel] [RFC PATCH] vfio: VFIO PCI driver for Qemu, Alex Williamson, 2012/07/26
- Re: [Qemu-devel] [RFC PATCH] vfio: VFIO PCI driver for Qemu, Avi Kivity, 2012/07/26
- Re: [Qemu-devel] [RFC PATCH] vfio: VFIO PCI driver for Qemu, Alex Williamson, 2012/07/26
- Re: [Qemu-devel] [RFC PATCH] vfio: VFIO PCI driver for Qemu, Avi Kivity, 2012/07/26
Re: [Qemu-devel] [RFC PATCH] vfio: VFIO PCI driver for Qemu, Alex Williamson, 2012/07/26
Re: [Qemu-devel] [RFC PATCH] vfio: VFIO PCI driver for Qemu, Avi Kivity, 2012/07/26