kata-containers/cloud-hypervisor
1
0
Fork 0
mirror of https://github.com/cloud-hypervisor/cloud-hypervisor.git synced 2026-08-05 02:19:16 +00:00
Code Issues Packages Projects Releases Wiki Activity

vm-virtio: Implement support for EVENT_IDX

Browse Source 
VIRTIO_RING_F_EVENT_IDX is a virtio feature that allows to avoid
device <-> driver notifications under some circunstances, most
notably when actively polling the queue.

This commit implements support for in in the vm-virtio
crate. Consumers of this crate will also need to add support for it by
exposing the feature and calling using update_avail_event() and
get_used_event() accordingly.

Signed-off-by: Sergio Lopez <slp@redhat.com>
This commit is contained in:
Sergio Lopez
2020-02-14 06:14:27 -05:00
committed by Rob Bradford
parent 793d4e7b8d
commit d17fa784bc
2 changed files with 51 additions and 2 deletions
Download Patch File Download Diff File Expand all files Collapse all files

2
vm-virtio/src/vhost_user/blk.rs
View File

@@ -24,6 +24,7 @@ use vhost_rs::vhost_user::message::{VhostUserProtocolFeatures, VhostUserVirtioFe
use vhost_rs::vhost_user::{Master, VhostUserMaster, VhostUserMasterReqHandler};
use vhost_rs::VhostBackend;
use virtio_bindings::bindings::virtio_blk::*;
use virtio_bindings::bindings::virtio_ring::VIRTIO_RING_F_EVENT_IDX;
use vm_device::{Migratable, MigratableError, Pausable, Snapshotable};
use vm_memory::{ByteValued, GuestAddressSpace, GuestMemoryAtomic, GuestMemoryMmap};
use vmm_sys_util::eventfd::EventFd;
@@ -57,6 +58,7 @@ impl Blk {
| 1 << VIRTIO_BLK_F_BLK_SIZE
| 1 << VIRTIO_BLK_F_FLUSH
| 1 << VIRTIO_BLK_F_TOPOLOGY
| 1 << VIRTIO_RING_F_EVENT_IDX
| 1 << VIRTIO_F_VERSION_1
| VhostUserVirtioFeatures::PROTOCOL_FEATURES.bits();