path: root/drivers/lguest/lguest_bus.c
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authorRusty Russell <rusty@rustcorp.com.au>2007-10-22 11:03:40 +1000
committerRusty Russell <rusty@rustcorp.com.au>2007-10-23 15:49:55 +1000
commit0a8a69dd77ddbd4513b21363021ecde7e1025502 (patch)
treeed6d8f0756835390b4c0d9a172422f2e42a65523 /drivers/lguest/lguest_bus.c
parentModule autoprobing support for virtio drivers. (diff)
Virtio helper routines for a descriptor ringbuffer implementation
These helper routines supply most of the virtqueue_ops for hypervisors which want to use a ring for virtio. Unlike the previous lguest implementation: 1) The rings are variable sized (2^n-1 elements). 2) They have an unfortunate limit of 65535 bytes per sg element. 3) The page numbers are always 64 bit (PAE anyone?) 4) They no longer place used[] on a separate page, just a separate cacheline. 5) We do a modulo on a variable. We could be tricky if we cared. 6) Interrupts and notifies are suppressed using flags within the rings. Users need only get the ring pages and provide a notify hook (KVM wants the guest to allocate the rings, lguest does it sanely). Signed-off-by: Rusty Russell <rusty@rustcorp.com.au> Cc: Dor Laor <dor.laor@qumranet.com>
Diffstat (limited to 'drivers/lguest/lguest_bus.c')
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