linux-kernel - Re: [PATCH] vhost: introduce vDPA based backend

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Message-ID: <798e5644-ca28-ee46-c953-688af9bccd3b@redhat.com>
Date:   Wed, 5 Feb 2020 11:12:21 +0800
From:   Jason Wang <jasowang@...hat.com>
To:     Tiwei Bie <tiwei.bie@...el.com>
Cc:     "Michael S. Tsirkin" <mst@...hat.com>,
        linux-kernel@...r.kernel.org, kvm@...r.kernel.org,
        virtualization@...ts.linux-foundation.org, netdev@...r.kernel.org,
        shahafs@...lanox.com, jgg@...lanox.com, rob.miller@...adcom.com,
        haotian.wang@...ive.com, eperezma@...hat.com, lulu@...hat.com,
        parav@...lanox.com, rdunlap@...radead.org, hch@...radead.org,
        jiri@...lanox.com, hanand@...inx.com, mhabets@...arflare.com,
        maxime.coquelin@...hat.com, lingshan.zhu@...el.com,
        dan.daly@...el.com, cunming.liang@...el.com, zhihong.wang@...el.com
Subject: Re: [PATCH] vhost: introduce vDPA based backend


On 2020/2/5 上午10:05, Tiwei Bie wrote:
> On Tue, Feb 04, 2020 at 02:46:16PM +0800, Jason Wang wrote:
>> On 2020/2/4 下午2:01, Michael S. Tsirkin wrote:
>>> On Tue, Feb 04, 2020 at 11:30:11AM +0800, Jason Wang wrote:
>>>> 5) generate diffs of memory table and using IOMMU API to setup the dma
>>>> mapping in this method
>>> Frankly I think that's a bunch of work. Why not a MAP/UNMAP interface?
>>>
>> Sure, so that basically VHOST_IOTLB_UPDATE/INVALIDATE I think?
> Do you mean we let userspace to only use VHOST_IOTLB_UPDATE/INVALIDATE
> to do the DMA mapping in vhost-vdpa case? When vIOMMU isn't available,
> userspace will set msg->iova to GPA, otherwise userspace will set
> msg->iova to GIOVA, and vhost-vdpa module will get HPA from msg->uaddr?
>
> Thanks,
> Tiwei


I think so. Michael, do you think this makes sense?

Thanks


>
>> Thanks
>>
>>