linux-kernel - Re: [PATCH] xen/privcmd: allow fetching resource sizes

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Date:   Tue, 12 Jan 2021 11:34:16 +0100
From:   Jürgen Groß <jgross@...e.com>
To:     Roger Pau Monné <roger.pau@...rix.com>
Cc:     linux-kernel@...r.kernel.org,
        Boris Ostrovsky <boris.ostrovsky@...cle.com>,
        Stefano Stabellini <sstabellini@...nel.org>,
        Paul Durrant <paul.durrant@...rix.com>,
        xen-devel@...ts.xenproject.org
Subject: Re: [PATCH] xen/privcmd: allow fetching resource sizes

On 12.01.21 11:03, Roger Pau Monné wrote:
> On Tue, Jan 12, 2021 at 06:57:30AM +0100, Jürgen Groß wrote:
>> On 11.01.21 16:29, Roger Pau Monne wrote:
>>> Allow issuing an IOCTL_PRIVCMD_MMAP_RESOURCE ioctl with num = 0 and
>>> addr = 0 in order to fetch the size of a specific resource.
>>>
>>> Add a shortcut to the default map resource path, since fetching the
>>> size requires no address to be passed in, and thus no VMA to setup.
>>>
>>> Fixes: 3ad0876554caf ('xen/privcmd: add IOCTL_PRIVCMD_MMAP_RESOURCE')
>>
>> I don't think this addition is a reason to add a "Fixes:" tag. This is
>> clearly new functionality.
> 
> It could be argued that not allowing to query the resource size was a
> shortcoming of the original implementation, but a backport request to
> stable would be more appropriate than a fixes tag I think. Will drop
> on next version and add a backport request if you agree.

Yes, please.


Juergen

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