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| author | Alex Williamson <alex.williamson@redhat.com> | 2013-12-19 10:17:11 -0700 |
|---|---|---|
| committer | Alex Williamson <alex.williamson@redhat.com> | 2013-12-19 10:17:11 -0700 |
| commit | 8dcf94bcff5bf3b54380ae2a17b034fb3b9d58e5 (patch) | |
| tree | c4aa4fed92a368b7ab6933e9c377c1b7b5a331bd | |
| parent | 319e2e3f63c348a9b66db4667efa73178e18b17d (diff) | |
| download | lwn-8dcf94bcff5bf3b54380ae2a17b034fb3b9d58e5.tar.gz lwn-8dcf94bcff5bf3b54380ae2a17b034fb3b9d58e5.zip | |
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: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| -rw-r--r-- | Documentation/devices.txt | 1 | ||||
| -rw-r--r-- | include/linux/miscdevice.h | 1 |
2 files changed, 2 insertions, 0 deletions
diff --git a/Documentation/devices.txt b/Documentation/devices.txt index 80b72419ffd8..10378cc48374 100644 --- a/Documentation/devices.txt +++ b/Documentation/devices.txt @@ -409,6 +409,7 @@ Your cooperation is appreciated. 193 = /dev/d7s SPARC 7-segment display 194 = /dev/zkshim Zero-Knowledge network shim control 195 = /dev/elographics/e2201 Elographics touchscreen E271-2201 + 196 = /dev/vfio/vfio VFIO userspace driver interface 198 = /dev/sexec Signed executable interface 199 = /dev/scanners/cuecat :CueCat barcode scanner 200 = /dev/net/tun TAP/TUN network device diff --git a/include/linux/miscdevice.h b/include/linux/miscdevice.h index f7eaf2d60083..3737f7218f51 100644 --- a/include/linux/miscdevice.h +++ b/include/linux/miscdevice.h @@ -30,6 +30,7 @@ #define STORE_QUEUE_MINOR 155 #define I2O_MINOR 166 #define MICROCODE_MINOR 184 +#define VFIO_MINOR 196 #define TUN_MINOR 200 #define CUSE_MINOR 203 #define MWAVE_MINOR 219 /* ACP/Mwave Modem */ |