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

[Jürgen Groß <jgross@xxxxxxxx>]

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@xxxxxxxxxx>
> Cc: stable@xxxxxxxxxxxxxxx # >= 4.18
Reviewed-by: Juergen Gross <jgross@xxxxxxxx>


Juergen

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