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 appears to be unused by anything currently in the kernel. Suggested-by: Paolo Bonzini <pbonzini@xxxxxxxxxx> Signed-off-by: Alex Williamson <alex.williamson@xxxxxxxxxx> --- Documentation/devices.txt | 1 + include/linux/miscdevice.h | 1 + 2 files changed, 2 insertions(+) diff --git a/Documentation/devices.txt b/Documentation/devices.txt index 80b7241..10378cc 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 f7eaf2d..3737f72 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 */ -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
