linux-kernel - Re: [PATCH v2] Improve docs for IOCTL_GNTDEV_MAP_GRANT

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Message-ID: <370e3874-d547-acad-924c-87ad8ef00a1d@suse.com>
Date:   Tue, 1 Feb 2022 07:07:45 +0100
From:   Juergen Gross <jgross@...e.com>
To:     Demi Marie Obenour <demiobenour@...il.com>,
        Boris Ostrovsky <boris.ostrovsky@...cle.com>,
        Stefano Stabellini <sstabellini@...nel.org>
Cc:     xen-devel@...ts.xenproject.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] Improve docs for IOCTL_GNTDEV_MAP_GRANT_REF

On 31.01.22 18:23, Demi Marie Obenour wrote:
> The current implementation of gntdev guarantees that the first call to
> IOCTL_GNTDEV_MAP_GRANT_REF will set @index to 0.  This is required to
> use gntdev for Wayland, which is a future desire of Qubes OS.
> Additionally, requesting zero grants results in an error, but this was
> not documented either.  Document both of these.
> 
> Signed-off-by: Demi Marie Obenour <demiobenour@...il.com>

Reviewed-by: Juergen Gross <jgross@...e.com>


Juergen

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