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authorStefano Garzarella <sgarzare@redhat.com>2022-11-21 11:11:01 +0100
committerMichael S. Tsirkin <mst@redhat.com>2022-11-22 05:19:00 -0500
commit562a7d23bf9a2f978cea799af40a1b2b0b4fc71b (patch)
treead37c3d6930642ebcfe1e9eaab97cff47d414039 /hw/virtio/vhost-user-fs.c
parent2c8311241d1f7377bb4ff76064b1d1fe15166413 (diff)
vhost: mask VIRTIO_F_RING_RESET for vhost and vhost-user devices
Commit 69e1c14aa2 ("virtio: core: vq reset feature negotation support") enabled VIRTIO_F_RING_RESET by default for all virtio devices. This feature is not currently emulated by QEMU, so for vhost and vhost-user devices we need to make sure it is supported by the offloaded device emulation (in-kernel or in another process). To do this we need to add VIRTIO_F_RING_RESET to the features bitmap passed to vhost_get_features(). This way it will be masked if the device does not support it. This issue was initially discovered with vhost-vsock and vhost-user-vsock, and then also tested with vhost-user-rng which confirmed the same issue. They fail when sending features through VHOST_SET_FEATURES ioctl or VHOST_USER_SET_FEATURES message, since VIRTIO_F_RING_RESET is negotiated by the guest (Linux >= v6.0), but not supported by the device. Fixes: 69e1c14aa2 ("virtio: core: vq reset feature negotation support") Resolves: https://gitlab.com/qemu-project/qemu/-/issues/1318 Signed-off-by: Stefano Garzarella <sgarzare@redhat.com> Message-Id: <20221121101101.29400-1-sgarzare@redhat.com> Reviewed-by: Michael S. Tsirkin <mst@redhat.com> Signed-off-by: Michael S. Tsirkin <mst@redhat.com> Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com> Acked-by: Raphael Norwitz <raphael.norwitz@nutanix.com> Acked-by: Jason Wang <jasowang@redhat.com>
Diffstat (limited to 'hw/virtio/vhost-user-fs.c')
-rw-r--r--hw/virtio/vhost-user-fs.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/hw/virtio/vhost-user-fs.c b/hw/virtio/vhost-user-fs.c
index 1c40f42045..dc4014cdef 100644
--- a/hw/virtio/vhost-user-fs.c
+++ b/hw/virtio/vhost-user-fs.c
@@ -32,6 +32,7 @@ static const int user_feature_bits[] = {
VIRTIO_F_NOTIFY_ON_EMPTY,
VIRTIO_F_RING_PACKED,
VIRTIO_F_IOMMU_PLATFORM,
+ VIRTIO_F_RING_RESET,
VHOST_INVALID_FEATURE_BIT
};