kdump pv-on-hvm: introduce "reset_devices" command line option

kdump pv-on-hvm: introduce "reset_devices" command line option

    upstream commit 7e96287ddc4f42081e18248b6167041c0908004c

    [PATCH] kdump: introduce "reset_devices" command line option

    Resetting the devices during driver initialization can be a costly
    operation in terms of time (especially scsi devices).  This option
    can be
    used by drivers to know that user forcibly wants the devices to be
    reset
    during initialization.

    This option can be useful while kernel is booting in unreliable
    environment.  For ex.  during kdump boot where devices are in
    unknown
    random state and BIOS execution has been skipped.

    Signed-off-by: Vivek Goyal <vgoyal@in.ibm.com>
    Signed-off-by: Andrew Morton <akpm@osdl.org>
    Signed-off-by: Linus Torvalds <torvalds@osdl.org>