Re: [PATCH for <= 5.4] xen/privcmd: allow fetching resource sizes

[Greg KH <greg@xxxxxxxxx>]

On Tue, Jan 26, 2021 at 05:22:59PM +0000, Andrew Cooper wrote:
> On 20/01/2021 11:03, Greg KH wrote:
> > On Mon, Jan 18, 2021 at 03:04:26PM +0100, Roger Pau Monne wrote:
> >> commit ef3a575baf53571dc405ee4028e26f50856898e7 upstream
> >>
> >> 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>
> >> Reviewed-by: Juergen Gross <jgross@xxxxxxxx>
> >> Tested-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
> >> Cc: stable@xxxxxxxxxxxxxxx # >= 4.18
> >> Link: https://lore.kernel.org/r/20210112115358.23346-1-roger.pau@xxxxxxxxxx
> >> Signed-off-by: Juergen Gross <jgross@xxxxxxxx>
> >> ---
> >> Cc: Boris Ostrovsky <boris.ostrovsky@xxxxxxxxxx>
> >> Cc: xen-devel@xxxxxxxxxxxxxxxxxxxx
> >> ---
> >>  drivers/xen/privcmd.c | 25 +++++++++++++++++++------
> >>  1 file changed, 19 insertions(+), 6 deletions(-)
> > Now queued up, thanks.
> 
> Hello,
> 
> The upstream version of this patch was queued against 5.4 and 4.19, both
> of which suffered a patch conflict, and are fixed by this version.
> 
> Was it an oversight that this version didn't get queued for 4.19?

It does not apply cleanly there, if you provide a working backport, I
will be glad to apply it.

thanks,

greg k-h