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

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Message-ID: <c71f63a1-1b5f-f552-d3d2-531a33c087bb@cam.ac.uk>
Date:   Tue, 12 Jan 2021 20:09:09 +0000
From:   Andrew Cooper <amc96@....ac.uk>
To:     Jürgen Groß <jgross@...e.com>,
        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>,
        andrew.cooper3@...rix.com, xen-devel@...ts.xenproject.org
Subject: Re: [PATCH v2] xen/privcmd: allow fetching resource sizes

On 12/01/2021 12:17, Jürgen Groß wrote:
> 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>

Tested-by: Andrew Cooper <andrew.cooper3@...rix.com>