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Date:   Wed, 13 Jan 2021 12:32:35 +0100
From:   Jürgen Groß <>
To:     Roger Pau Monne <>,
        Boris Ostrovsky <>,
        Stefano Stabellini <>,
        Paul Durrant <>,,,
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 <>
> Cc: # >= 4.18

Pushed to xen/tip.git for-linus-5.11


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