linux-kernel - Re: [PATCH] xen/privcmd: remove privcmd_ioctl

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Message-ID: <4a95c3d1-d4e8-9b59-8db8-231b59cdb8f5@suse.com>
Date:   Thu, 15 Sep 2022 12:20:32 +0200
From:   Juergen Gross <jgross@...e.com>
To:     Jan Beulich <jbeulich@...e.com>
Cc:     Stefano Stabellini <sstabellini@...nel.org>,
        Oleksandr Tyshchenko <oleksandr_tyshchenko@...m.com>,
        xen-devel@...ts.xenproject.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] xen/privcmd: remove privcmd_ioctl_mmap()

On 15.09.22 11:32, Jan Beulich wrote:
> On 15.09.2022 10:39, Juergen Gross wrote:
>> The IOCTL_PRIVCMD_MMAP isn't in use by Xen since at least Xen 4.0.
>>
>> Remove it from the privcmd driver.
>>
>> Signed-off-by: Juergen Gross <jgross@...e.com>
> 
> Can we reasonably remove an IOCTL, without being entirely certain that
> no users exist outside of xen.git?

This is a valid question. I'm not sure how probable it is that such a user
is existing. Are there any Xen tool stacks not using the Xen libraries?

If so, why? Do we want to support those use cases?

> Even if so, shouldn't there be a
> staged deprecation process?

Depends on the answer to above questions.


Juergen

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