linux-kernel - Re: [PATCH 0/4] vDPA: API for reporting IOVA range

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Message-ID: <20201021104508-mutt-send-email-mst@kernel.org>
Date:   Wed, 21 Oct 2020 10:45:44 -0400
From:   "Michael S. Tsirkin" <mst@...hat.com>
To:     Jason Wang <jasowang@...hat.com>
Cc:     virtualization@...ts.linux-foundation.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 0/4] vDPA: API for reporting IOVA range

On Wed, Jun 17, 2020 at 11:29:43AM +0800, Jason Wang wrote:
> Hi All:
> 
> This series introduces API for reporing IOVA range. This is a must for
> userspace to work correclty:
> 
> - for the process that uses vhost-vDPA directly to properly allocate
>   IOVA
> - for VM(qemu), when vIOMMU is not enabled, fail early if GPA is out
>   of range
> - for VM(qemu), when vIOMMU is enabled, determine a valid guest
>   address width
> 
> Please review.
> 
> Thanks

OK so what is the plan here? Change begin-end->first-last and repost?

> Jason Wang (4):
>   vdpa: introduce config op to get valid iova range
>   vdpa_sim: implement get_iova_range bus operation
>   vdpa: get_iova_range() is mandatory for device specific DMA
>     translation
>   vhost: vdpa: report iova range
> 
>  drivers/vdpa/vdpa.c              |  4 ++++
>  drivers/vdpa/vdpa_sim/vdpa_sim.c | 11 +++++++++++
>  drivers/vhost/vdpa.c             | 27 +++++++++++++++++++++++++++
>  include/linux/vdpa.h             | 14 ++++++++++++++
>  include/uapi/linux/vhost.h       |  4 ++++
>  include/uapi/linux/vhost_types.h |  5 +++++
>  6 files changed, 65 insertions(+)
> 
> -- 
> 2.20.1