linux-kernel - Re: [PATCH 5/6] vdpa: introduce virtio pci driver

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Message-ID: <e722bb62-2a72-779a-f542-1096e8f609b8@redhat.com>
Date:   Tue, 2 Jun 2020 15:12:27 +0800
From:   Jason Wang <jasowang@...hat.com>
To:     "Michael S. Tsirkin" <mst@...hat.com>
Cc:     kvm@...r.kernel.org, virtualization@...ts.linux-foundation.org,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        rob.miller@...adcom.com, lingshan.zhu@...el.com,
        eperezma@...hat.com, lulu@...hat.com, shahafs@...lanox.com,
        hanand@...inx.com, mhabets@...arflare.com, gdawar@...inx.com,
        saugatm@...inx.com, vmireyno@...vell.com,
        zhangweining@...jie.com.cn, eli@...lanox.com
Subject: Re: [PATCH 5/6] vdpa: introduce virtio pci driver


On 2020/6/2 下午1:09, Michael S. Tsirkin wrote:
> On Fri, May 29, 2020 at 04:03:02PM +0800, Jason Wang wrote:
>> Note that since virtio specification does not support get/restore
>> virtqueue state. So we can not use this driver for VM. This can be
>> addressed by extending the virtio specification.
> Looks like exactly the kind of hardware limitation VDPA is supposed to
> paper over within guest. So I suggest we use this as
> a litmus test, and find ways for VDPA to handle this without
> spec changes.


Yes, and just to confirm, do you think it's beneficial to extend virtio 
specification to support state get/set?

Thanks


>