On Fri, Apr 20, 2018 at 11:52:47AM +0800, Jason Wang wrote:
> > The biggest issue is that you let userspace poke at the
> > device which is also allowed by the IOMMU to poke at
> > kernel memory (needed for kernel driver to work).
>
> I don't quite get. The userspace driver could be built on top o
On Fri, Apr 20, 2018 at 03:50:41AM +, Liang, Cunming wrote:
>
>
> > -Original Message-
> > From: Bie, Tiwei
> > Sent: Friday, April 20, 2018 11:28 AM
> > To: Michael S. Tsirkin
> > Cc: Jason Wang ; alex.william...@redhat.com;
> > ddut...@redhat.com; Duyck, Alexander H ;
> > virtio-de
On 2018年04月20日 02:40, Michael S. Tsirkin wrote:
On Tue, Apr 10, 2018 at 03:25:45PM +0800, Jason Wang wrote:
One problem is that, different virtio ring compatible devices
may have different device interfaces. That is to say, we will
need different drivers in QEMU. It could be troublesome. And
t
On Fri, Apr 20, 2018 at 11:28:07AM +0800, Tiwei Bie wrote:
> On Thu, Apr 19, 2018 at 09:40:23PM +0300, Michael S. Tsirkin wrote:
> > On Tue, Apr 10, 2018 at 03:25:45PM +0800, Jason Wang wrote:
> > > > > > One problem is that, different virtio ring compatible devices
> > > > > > may have different d
> -Original Message-
> From: Bie, Tiwei
> Sent: Friday, April 20, 2018 11:28 AM
> To: Michael S. Tsirkin
> Cc: Jason Wang ; alex.william...@redhat.com;
> ddut...@redhat.com; Duyck, Alexander H ;
> virtio-dev@lists.oasis-open.org; linux-ker...@vger.kernel.org;
> k...@vger.kernel.org; virt
On Thu, Apr 19, 2018 at 09:40:23PM +0300, Michael S. Tsirkin wrote:
> On Tue, Apr 10, 2018 at 03:25:45PM +0800, Jason Wang wrote:
> > > > > One problem is that, different virtio ring compatible devices
> > > > > may have different device interfaces. That is to say, we will
> > > > > need different
On Tue, Apr 10, 2018 at 03:25:45PM +0800, Jason Wang wrote:
> > > > One problem is that, different virtio ring compatible devices
> > > > may have different device interfaces. That is to say, we will
> > > > need different drivers in QEMU. It could be troublesome. And
> > > > that's what this patch
-dev@lists.oasis-open.org;linux-ker...@vger.kernel.org;
k...@vger.kernel.org;virtualizat...@lists.linux-foundation.org;
net...@vger.kernel.org; Daly, Dan; Wang, Zhihong
; Tan, Jianfeng; Wang, Xiao
W
Subject: Re: [virtio-dev] Re: [RFC] vhost: introduce mdev based hardware vhost
backend
On Tue, Apr
@lists.oasis-
open.org; linux-ker...@vger.kernel.org; k...@vger.kernel.org;
virtualizat...@lists.linux-foundation.org; net...@vger.kernel.org; Daly, Dan
; Liang, Cunming ; Wang,
Zhihong ; Tan, Jianfeng ;
Wang, Xiao W
Subject: Re: [virtio-dev] Re: [RFC] vhost: introduce mdev based hardware
vhost backend
On Tue, Apr 10, 2018 at 09:23:53AM +, Liang, Cunming wrote:
> If QEMU is going to build a user space driver framework there, we're open
> mind on that, even leveraging DPDK as the underlay library. Looking forward
> to more others' comments from community.
There is already an NVMe VFIO drive
> From: Liang, Cunming
> Sent: Tuesday, April 10, 2018 10:24 PM
>
[...]
> >
> > As others said, we do not need to go overeboard. A couple of small
> vendor-
> > specific quirks in qemu isn't a big deal.
>
> It's quite challenge to identify it's small or not, there's no uniform metric.
>
> It's o
; virtio-dev@lists.oasis-open.org; linux-ker...@vger.kernel.org;
> k...@vger.kernel.org; virtualizat...@lists.linux-foundation.org;
> net...@vger.kernel.org; Daly, Dan ; Wang, Zhihong
> ; Tan, Jianfeng ; Wang, Xiao
> W
> Subject: Re: [virtio-dev] Re: [RFC] vhost: introduce mdev based hardw
; > Zhihong ; Tan, Jianfeng ;
> > Wang, Xiao W
> > Subject: Re: [virtio-dev] Re: [RFC] vhost: introduce mdev based hardware
> > vhost backend
> >
> > On 10/04/2018 06:57, Tiwei Bie wrote:
> > >> So you just move the abstraction layer from qemu to kernel, and yo
; open.org; linux-ker...@vger.kernel.org; k...@vger.kernel.org;
> virtualizat...@lists.linux-foundation.org; net...@vger.kernel.org; Daly, Dan
> ; Liang, Cunming ; Wang,
> Zhihong ; Tan, Jianfeng ;
> Wang, Xiao W
> Subject: Re: [virtio-dev] Re: [RFC] vhost: introduce mdev based hardware
&
On 10/04/2018 06:57, Tiwei Bie wrote:
>> So you just move the abstraction layer from qemu to kernel, and you still
>> need different drivers in kernel for different device interfaces of
>> accelerators. This looks even more complex than leaving it in qemu. As you
>> said, another idea is to impleme
On 2018年04月10日 12:57, Tiwei Bie wrote:
On Tue, Apr 10, 2018 at 10:52:52AM +0800, Jason Wang wrote:
On 2018年04月02日 23:23, Tiwei Bie wrote:
This patch introduces a mdev (mediated device) based hardware
vhost backend. This backend is an abstraction of the various
hardware vhost accelerators (pot
On Tue, Apr 10, 2018 at 10:52:52AM +0800, Jason Wang wrote:
> On 2018年04月02日 23:23, Tiwei Bie wrote:
> > This patch introduces a mdev (mediated device) based hardware
> > vhost backend. This backend is an abstraction of the various
> > hardware vhost accelerators (potentially any device that uses
>
On 2018年04月02日 23:23, Tiwei Bie wrote:
This patch introduces a mdev (mediated device) based hardware
vhost backend. This backend is an abstraction of the various
hardware vhost accelerators (potentially any device that uses
virtio ring can be used as a vhost accelerator). Some generic
mdev pare
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