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@citrix.com Reviewed-by: Juergen Gross jgross@suse.com Tested-by: Andrew Cooper andrew.cooper3@citrix.com Cc: stable@vger.kernel.org # >= 4.18 Link: https://lore.kernel.org/r/20210112115358.23346-1-roger.pau@citrix.com Signed-off-by: Juergen Gross jgross@suse.com
Cc: Boris Ostrovsky boris.ostrovsky@oracle.com Cc: xen-devel@lists.xenproject.org
drivers/xen/privcmd.c | 25 +++++++++++++++++++------ 1 file changed, 19 insertions(+), 6 deletions(-)
Now queued up, thanks.
greg k-h