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

[Andrew Cooper <amc96@xxxxxxxxx>]

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

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