netdev - Re: [PATCH V7 mlx5-next 10/15] vfio: Remove migration protocol v1 documentation

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Message-ID: <871r09u0kg.fsf@redhat.com>
Date:   Fri, 11 Feb 2022 12:03:59 +0100
From:   Cornelia Huck <cohuck@...hat.com>
To:     Yishai Hadas <yishaih@...dia.com>, alex.williamson@...hat.com,
        bhelgaas@...gle.com, jgg@...dia.com, saeedm@...dia.com
Cc:     linux-pci@...r.kernel.org, kvm@...r.kernel.org,
        netdev@...r.kernel.org, kuba@...nel.org, leonro@...dia.com,
        kwankhede@...dia.com, mgurtovoy@...dia.com, yishaih@...dia.com,
        maorg@...dia.com, ashok.raj@...el.com, kevin.tian@...el.com,
        shameerali.kolothum.thodi@...wei.com
Subject: Re: [PATCH V7 mlx5-next 10/15] vfio: Remove migration protocol v1
 documentation

On Mon, Feb 07 2022, Yishai Hadas <yishaih@...dia.com> wrote:

> From: Jason Gunthorpe <jgg@...dia.com>
>
> v1 was never implemented and is replaced by v2.
>
> The old uAPI documentation is removed from the header file.
>
> The old uAPI definitions are still kept in the header file till v2 will
> reach Linus's tree.

That sentence is a bit weird: If this file has reached Linus' tree,
obviously v2 has reached Linus' tree. Maybe replace with:

"The old uAPI definitions are still kept in the header file to ease
transition for userspace copying these headers."

>
> Signed-off-by: Jason Gunthorpe <jgg@...dia.com>
> Signed-off-by: Yishai Hadas <yishaih@...dia.com>
> ---
>  include/uapi/linux/vfio.h | 200 +-------------------------------------
>  1 file changed, 2 insertions(+), 198 deletions(-)
>
> diff --git a/include/uapi/linux/vfio.h b/include/uapi/linux/vfio.h
> index 773895988cf1..227f55d57e06 100644
> --- a/include/uapi/linux/vfio.h
> +++ b/include/uapi/linux/vfio.h
> @@ -323,7 +323,7 @@ struct vfio_region_info_cap_type {
>  #define VFIO_REGION_TYPE_PCI_VENDOR_MASK	(0xffff)
>  #define VFIO_REGION_TYPE_GFX                    (1)
>  #define VFIO_REGION_TYPE_CCW			(2)
> -#define VFIO_REGION_TYPE_MIGRATION              (3)
> +#define VFIO_REGION_TYPE_MIGRATION_DEPRECATED   (3)

This will still break QEMU compilation after a headers update (although
it's not hard to fix.) I think we can live with that if needed.

>  
>  /* sub-types for VFIO_REGION_TYPE_PCI_* */
>