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Commit 8dcf94bc authored by Alex Williamson's avatar Alex Williamson
Browse files

misc: Reserve minor for VFIO 



VFIO currently allocates it's own dynamic chardev range, reserving the
first minor for the control part of the interface (/dev/vfio/vfio) and
the remainder for VFIO groups (/dev/vfio/$GROUP).  This works, but it
doesn't support auto loading.  For instance when libvirt checks for
VFIO support it looks for /dev/vfio/vfio, which currently doesn't
exist unless the vfio module is loaded.  By converting the control
device to a misc driver and reserving a static minor, we can enable
auto loading.

Reserving the minor is a prerequist to that conversion.  Minor 196
is unused by anything currently in the kernel.

Suggested-by: default avatarPaolo Bonzini <pbonzini@redhat.com>
Signed-off-by: default avatarAlex Williamson <alex.williamson@redhat.com>
Acked-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 319e2e3f

Documentation/devices.txt

+1 −0
Original line number Original line Diff line number Diff line
@@ -409,6 +409,7 @@ Your cooperation is appreciated. 
		193 = /dev/d7s		SPARC 7-segment display

		193 = /dev/d7s		SPARC 7-segment display

		194 = /dev/zkshim	Zero-Knowledge network shim control

		194 = /dev/zkshim	Zero-Knowledge network shim control

		195 = /dev/elographics/e2201	Elographics touchscreen E271-2201

		195 = /dev/elographics/e2201	Elographics touchscreen E271-2201

		196 = /dev/vfio/vfio	VFIO userspace driver interface

		198 = /dev/sexec	Signed executable interface

		198 = /dev/sexec	Signed executable interface

		199 = /dev/scanners/cuecat :CueCat barcode scanner

		199 = /dev/scanners/cuecat :CueCat barcode scanner

		200 = /dev/net/tun	TAP/TUN network device

		200 = /dev/net/tun	TAP/TUN network device

include/linux/miscdevice.h

+1 −0
Original line number Original line Diff line number Diff line
@@ -30,6 +30,7 @@ 
#define STORE_QUEUE_MINOR	155

#define STORE_QUEUE_MINOR	155

#define I2O_MINOR		166

#define I2O_MINOR		166

#define MICROCODE_MINOR		184

#define MICROCODE_MINOR		184

#define VFIO_MINOR		196

#define TUN_MINOR		200

#define TUN_MINOR		200

#define CUSE_MINOR		203

#define CUSE_MINOR		203

#define MWAVE_MINOR		219	/* ACP/Mwave Modem */

#define MWAVE_MINOR		219	/* ACP/Mwave Modem */