linux-kernel - Re: [PATCH v2] xen/privcmd: allow fetching resource sizes

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Date:   Tue, 12 Jan 2021 13:17:32 +0100
From:   Jürgen Groß <jgross@...e.com>
To:     Roger Pau Monne <roger.pau@...rix.com>,
        linux-kernel@...r.kernel.org
Cc:     stable@...r.kernel.org,
        Boris Ostrovsky <boris.ostrovsky@...cle.com>,
        Stefano Stabellini <sstabellini@...nel.org>,
        Paul Durrant <paul.durrant@...rix.com>, amc96@....ac.uk,
        andrew.cooper3@...rix.com, xen-devel@...ts.xenproject.org
Subject: Re: [PATCH v2] xen/privcmd: allow fetching resource sizes

On 12.01.21 12:53, 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.
> 
> This is missing from the initial implementation, and causes issues
> when mapping resources that don't have fixed or known sizes.
> 
> Signed-off-by: Roger Pau Monné <roger.pau@...rix.com>
> Cc: stable@...r.kernel.org # >= 4.18

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


Juergen

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