From 46f9c2b925ac12e5ad8b8b7c90c71dacc9d5db37 Mon Sep 17 00:00:00 2001 From: Heinz Graalfs Date: Tue, 29 Oct 2013 09:38:50 +1030 Subject: virtio_ring: change host notification API Currently a host kick error is silently ignored and not reflected in the virtqueue of a particular virtio device. Changing the notify API for guest->host notification seems to be one prerequisite in order to be able to handle such errors in the context where the kick is triggered. This patch changes the notify API. The notify function must return a bool return value. It returns false if the host notification failed. Signed-off-by: Heinz Graalfs Signed-off-by: Rusty Russell --- tools/virtio/virtio_test.c | 3 ++- tools/virtio/vringh_test.c | 13 +++++++++---- 2 files changed, 11 insertions(+), 5 deletions(-) (limited to 'tools') diff --git a/tools/virtio/virtio_test.c b/tools/virtio/virtio_test.c index da7a19558281..059cb723f6a7 100644 --- a/tools/virtio/virtio_test.c +++ b/tools/virtio/virtio_test.c @@ -41,13 +41,14 @@ struct vdev_info { struct vhost_memory *mem; }; -void vq_notify(struct virtqueue *vq) +bool vq_notify(struct virtqueue *vq) { struct vq_info *info = vq->priv; unsigned long long v = 1; int r; r = write(info->kick, &v, sizeof v); assert(r == sizeof v); + return true; } void vq_callback(struct virtqueue *vq) diff --git a/tools/virtio/vringh_test.c b/tools/virtio/vringh_test.c index d053ea40c001..14a4f4cab5b9 100644 --- a/tools/virtio/vringh_test.c +++ b/tools/virtio/vringh_test.c @@ -22,7 +22,7 @@ static u64 user_addr_offset; #define RINGSIZE 256 #define ALIGN 4096 -static void never_notify_host(struct virtqueue *vq) +static bool never_notify_host(struct virtqueue *vq) { abort(); } @@ -65,17 +65,22 @@ struct guest_virtio_device { unsigned long notifies; }; -static void parallel_notify_host(struct virtqueue *vq) +static bool parallel_notify_host(struct virtqueue *vq) { + int rc; struct guest_virtio_device *gvdev; gvdev = container_of(vq->vdev, struct guest_virtio_device, vdev); - write(gvdev->to_host_fd, "", 1); + rc = write(gvdev->to_host_fd, "", 1); + if (rc < 0) + return false; gvdev->notifies++; + return true; } -static void no_notify_host(struct virtqueue *vq) +static bool no_notify_host(struct virtqueue *vq) { + return true; } #define NUM_XFERS (10000000) -- cgit v1.2.3-59-g8ed1b From 53c18c990644174935ca93e50d7ebd05e04cb9ee Mon Sep 17 00:00:00 2001 From: Heinz Graalfs Date: Tue, 29 Oct 2013 09:40:11 +1030 Subject: virtio_test: verify if virtqueue_kick() succeeded Verify if a host kick succeeded by checking return value of virtqueue_kick(). Signed-off-by: Heinz Graalfs Signed-off-by: Rusty Russell --- tools/virtio/virtio_test.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) (limited to 'tools') diff --git a/tools/virtio/virtio_test.c b/tools/virtio/virtio_test.c index 059cb723f6a7..bdb71a26ae35 100644 --- a/tools/virtio/virtio_test.c +++ b/tools/virtio/virtio_test.c @@ -172,7 +172,8 @@ static void run_test(struct vdev_info *dev, struct vq_info *vq, GFP_ATOMIC); if (likely(r == 0)) { ++started; - virtqueue_kick(vq->vq); + if (unlikely(!virtqueue_kick(vq->vq)) + r = -1; } } else r = -1; -- cgit v1.2.3-59-g8ed1b