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. greg k-h
