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

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Message-ID: <20210112100324.ii34oqldfrtmfd2f@Air-de-Roger>
Date:   Tue, 12 Jan 2021 11:03:24 +0100
From:   Roger Pau Monné <roger.pau@...rix.com>
To:     Jürgen Groß <jgross@...e.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 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.

Thanks, Roger.