| Message ID | 20131212184717.966.76895.stgit@bling.home (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
> 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/$GROUP). This works, but it > doesn't support auto loading. For instance when libvirt checks for > VFIO support it looks for /dev/vfio/vfio, which currently doesn't > exist unless the vfio module is loaded. By converting the control > device to a misc driver and reserving a static minor, we can enable > auto loading. Looks sensible to me. I'm not sure if Lanana even really goes anywhere any more however. Linus kept complaining about static device numbering despite the fact it's still essential for a few odd cases like this. Alan -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
diff --git a/Documentation/devices.txt b/Documentation/devices.txt index 80b7241..10378cc 100644 --- a/Documentation/devices.txt +++ b/Documentation/devices.txt @@ -409,6 +409,7 @@ Your cooperation is appreciated. 193 = /dev/d7s SPARC 7-segment display 194 = /dev/zkshim Zero-Knowledge network shim control 195 = /dev/elographics/e2201 Elographics touchscreen E271-2201 + 196 = /dev/vfio/vfio VFIO userspace driver interface 198 = /dev/sexec Signed executable interface 199 = /dev/scanners/cuecat :CueCat barcode scanner 200 = /dev/net/tun TAP/TUN network device diff --git a/include/linux/miscdevice.h b/include/linux/miscdevice.h index f7eaf2d..3737f72 100644 --- a/include/linux/miscdevice.h +++ b/include/linux/miscdevice.h @@ -30,6 +30,7 @@ #define STORE_QUEUE_MINOR 155 #define I2O_MINOR 166 #define MICROCODE_MINOR 184 +#define VFIO_MINOR 196 #define TUN_MINOR 200 #define CUSE_MINOR 203 #define MWAVE_MINOR 219 /* ACP/Mwave Modem */
VFIO currently allocates it's own dynamic chardev range, reserving the first minor for the control part of the interface (/dev/vfio/vfio) and the remainder for VFIO groups (/dev/vfio/$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@redhat.com> Signed-off-by: Alex Williamson <alex.williamson@redhat.com> --- Documentation/devices.txt | 1 + include/linux/miscdevice.h | 1 + 2 files changed, 2 insertions(+) -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html