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| author | Rusty Russell <rusty@rustcorp.com.au> | 2007-10-22 11:03:40 +1000 |
|---|---|---|
| committer | Rusty Russell <rusty@rustcorp.com.au> | 2007-10-23 15:49:55 +1000 |
| commit | 0a8a69dd77ddbd4513b21363021ecde7e1025502 (patch) | |
| tree | ed6d8f0756835390b4c0d9a172422f2e42a65523 /drivers/virtio/Kconfig | |
| parent | b01d9f2863349b0e041b90c3c86a998ee0fed2b0 (diff) | |
| download | linux-0a8a69dd77ddbd4513b21363021ecde7e1025502.tar.bz2 | |
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/virtio/Kconfig')
| -rw-r--r-- | drivers/virtio/Kconfig | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/drivers/virtio/Kconfig b/drivers/virtio/Kconfig index bce84b56a659..9e33fc4da875 100644 --- a/drivers/virtio/Kconfig +++ b/drivers/virtio/Kconfig @@ -1,3 +1,8 @@ # Virtio always gets selected by whoever wants it. config VIRTIO bool + +# Similarly the virtio ring implementation. +config VIRTIO_RING + bool + depends on VIRTIO |