From 0a8a69dd77ddbd4513b21363021ecde7e1025502 Mon Sep 17 00:00:00 2001 From: Rusty Russell Date: Mon, 22 Oct 2007 11:03:40 +1000 Subject: 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 Cc: Dor Laor --- drivers/virtio/Makefile | 1 + 1 file changed, 1 insertion(+) (limited to 'drivers/virtio/Makefile') diff --git a/drivers/virtio/Makefile b/drivers/virtio/Makefile index af0d57dad3e..f70e40971dd 100644 --- a/drivers/virtio/Makefile +++ b/drivers/virtio/Makefile @@ -1 +1,2 @@ obj-$(CONFIG_VIRTIO) += virtio.o +obj-$(CONFIG_VIRTIO_RING) += virtio_ring.o -- cgit v1.2.3