[virtio-dev] Re: [RFC] vhost: introduce mdev based hardware vhost backend

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

[virtio-dev] Re: [RFC] vhost: introduce mdev based hardware vhost backend

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; > >

[virtio-dev] Re: [RFC] vhost: introduce mdev based hardware vhost backend

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

[virtio-dev] Re: [RFC] vhost: introduce mdev based hardware vhost backend

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

[virtio-dev] RE: [RFC] vhost: introduce mdev based hardware vhost backend

> -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] Re: [RFC] vhost: introduce mdev based hardware vhost backend

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

[virtio-dev] Re: [RFC] vhost: introduce mdev based hardware vhost backend

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

Re: [virtio-dev] Re: [RFC] vhost: introduce mdev based hardware vhost backend

Dan<dan.d...@intel.com>; Wang, Zhihong <zhihong.w...@intel.com>; Tan, Jianfeng<jianfeng@intel.com>; Wang, Xiao W<xiao.w.w...@intel.com> Subject: Re: [virtio-dev] Re: [RFC] vhost: introduce mdev based hardware vhost backend On Tue, Apr 10, 2018 at 09:23:53AM +, Liang,

Re: [virtio-dev] Re: [RFC] vhost: introduce mdev based hardware vhost backend

.@intel.com>; Wang, Zhihong <zhihong.w...@intel.com>; Tan, Jianfeng <jianfeng@intel.com>; Wang, Xiao W <xiao.w.w...@intel.com> 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 abst

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

RE: [virtio-dev] Re: [RFC] vhost: introduce mdev based hardware vhost backend

> 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

RE: [virtio-dev] Re: [RFC] vhost: introduce mdev based hardware vhost backend

er.kernel.org; Daly, Dan <dan.d...@intel.com>; Wang, Zhihong > <zhihong.w...@intel.com>; Tan, Jianfeng <jianfeng....@intel.com>; Wang, Xiao > W <xiao.w.w...@intel.com> > Subject: Re: [virtio-dev] Re: [RFC] vhost: introduce mdev based hardware vhost > backend > &g

Re: [virtio-dev] Re: [RFC] vhost: introduce mdev based hardware vhost backend

oundation.org; net...@vger.kernel.org; Daly, Dan > > <dan.d...@intel.com>; Liang, Cunming <cunming.li...@intel.com>; Wang, > > Zhihong <zhihong.w...@intel.com>; Tan, Jianfeng <jianfeng@intel.com>; > > Wang, Xiao W <xiao.w.w...@intel.com> > > Subj

RE: [virtio-dev] Re: [RFC] vhost: introduce mdev based hardware vhost backend

el.com>; Wang, > Zhihong <zhihong.w...@intel.com>; Tan, Jianfeng <jianfeng....@intel.com>; > Wang, Xiao W <xiao.w.w...@intel.com> > Subject: Re: [virtio-dev] Re: [RFC] vhost: introduce mdev based hardware > vhost backend > > On 10/04/2018 06:57, Tiwei Bie wr

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 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

[virtio-dev] Re: [RFC] vhost: introduce mdev based hardware vhost backend

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

[virtio-dev] Re: [RFC] vhost: introduce mdev based hardware vhost backend

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

[virtio-dev] Re: [RFC] vhost: introduce mdev based hardware vhost backend

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