[Top][All Lists]
[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
Re: [Qemu-devel] [PATCH 0/3] VFIO-based PCI device assignment for QEMU 1
From: |
Jan Kiszka |
Subject: |
Re: [Qemu-devel] [PATCH 0/3] VFIO-based PCI device assignment for QEMU 1.2 |
Date: |
Tue, 14 Aug 2012 09:19:18 +0200 |
User-agent: |
Mozilla/5.0 (X11; U; Linux i686 (x86_64); de; rv:1.8.1.12) Gecko/20080226 SUSE/2.0.0.12-1.1 Thunderbird/2.0.0.12 Mnenhy/0.7.5.666 |
On 2012-08-13 21:31, Anthony Liguori wrote:
> Jan Kiszka <address@hidden> writes:
>
>> On 2012-08-13 15:58, Avi Kivity wrote:
>>> On 08/13/2012 04:27 PM, Anthony Liguori wrote:
>>>
>>>> Thanks for pushing this forward! Hopefully this will finally kill off
>>>> qemu-kvm.git for good.
>>>
>>> No, it won't. vfio requires a 3.6 kernel, which we cannot assume anyone
>>> has. We'll need the original device assignment code side-by-side.
>>
>> ...which is on my to-do list for 1.3.
>
> Is there a deprecation plan for the old device assignment code?
>
> I'm not really against the idea of requiring a new kernel for new
> features.
>
> From a Fedora/OpenSUSE point of view, would supporting old kernels be a
> requirement to stop shipping qemu-kvm.git over qemu.git?
>
> Since distros ship new kernels and new userspaces, I don't think distros
> would care so I'm not sure who we're trying to support old kernels for.
We are supporting KVM down to 2.6.3x, if not 2.6.2x. Also, device
assignment is a new feature for upstream, but not for the masses of KVM
users of QEMU (due to qemu-kvm and corresponding libvirt support). I
think it will take some more kernel releases to have all feature there
that allows performance-wise equivalent device assignment via VFIO. And
it can even be helpful to cross-check issues of VFIO in the field.
Except for some self-contained helper functions in the KVM layer,
classic device assignment will be as isolated as VFIO. So I don't think
we would take any noteworthy burden to maintain it as long as the kernel
supports this interface.
Can't comment on the other questions.
Jan
signature.asc
Description: OpenPGP digital signature
- Re: [Qemu-devel] [PATCH 2/3] vfio: vfio-pci device assignment driver, (continued)
- Re: [Qemu-devel] [PATCH 0/3] VFIO-based PCI device assignment for QEMU 1.2, Anthony Liguori, 2012/08/13
- Re: [Qemu-devel] [PATCH 0/3] VFIO-based PCI device assignment for QEMU 1.2, Avi Kivity, 2012/08/13
- Re: [Qemu-devel] [PATCH 0/3] VFIO-based PCI device assignment for QEMU 1.2, Jan Kiszka, 2012/08/13
- Re: [Qemu-devel] [PATCH 0/3] VFIO-based PCI device assignment for QEMU 1.2, Anthony Liguori, 2012/08/13
- Re: [Qemu-devel] [PATCH 0/3] VFIO-based PCI device assignment for QEMU 1.2,
Jan Kiszka <=
- Re: [Qemu-devel] [PATCH 0/3] VFIO-based PCI device assignment for QEMU 1.2, Avi Kivity, 2012/08/14
- Re: [Qemu-devel] [PATCH 0/3] VFIO-based PCI device assignment for QEMU 1.2, Cole Robinson, 2012/08/14
- Re: [Qemu-devel] [PATCH 0/3] VFIO-based PCI device assignment for QEMU 1.2, Jan Kiszka, 2012/08/14
- Re: [Qemu-devel] [PATCH 0/3] VFIO-based PCI device assignment for QEMU 1.2, Cole Robinson, 2012/08/14
Re: [Qemu-devel] [PATCH 0/3] VFIO-based PCI device assignment for QEMU 1.2, Alex Williamson, 2012/08/13
- Re: [Qemu-devel] [PATCH 0/3] VFIO-based PCI device assignment for QEMU 1.2, Andreas Hartmann, 2012/08/13
- Re: [Qemu-devel] [PATCH 0/3] VFIO-based PCI device assignment for QEMU 1.2, Alex Williamson, 2012/08/13
- Re: [Qemu-devel] [PATCH 0/3] VFIO-based PCI device assignment for QEMU 1.2, Andreas Hartmann, 2012/08/13
- Re: [Qemu-devel] [PATCH 0/3] VFIO-based PCI device assignment for QEMU 1.2, Alex Williamson, 2012/08/13
- Re: [Qemu-devel] [PATCH 0/3] VFIO-based PCI device assignment for QEMU 1.2, Andreas Hartmann, 2012/08/13