Stefano Garzarella 4daa5054c5 vhost: enable vrings in vhost_dev_start() for vhost-user devices ... Commit 02b61f38d3 ("hw/virtio: incorporate backend features in features") properly negotiates VHOST_USER_F_PROTOCOL_FEATURES with the vhost-user backend, but we forgot to enable vrings as specified in docs/interop/vhost-user.rst: If ``VHOST_USER_F_PROTOCOL_FEATURES`` has not been negotiated, the ring starts directly in the enabled state. If ``VHOST_USER_F_PROTOCOL_FEATURES`` has been negotiated, the ring is initialized in a disabled state and is enabled by ``VHOST_USER_SET_VRING_ENABLE`` with parameter 1. Some vhost-user front-ends already did this by calling vhost_ops.vhost_set_vring_enable() directly: - backends/cryptodev-vhost.c - hw/net/virtio-net.c - hw/virtio/vhost-user-gpio.c But most didn't do that, so we would leave the vrings disabled and some backends would not work. We observed this issue with the rust version of virtiofsd [1], which uses the event loop [2] provided by the vhost-user-backend crate where requests are not processed if vring is not enabled. Let's fix this issue by enabling the vrings in vhost_dev_start() for vhost-user front-ends that don't already do this directly. Same thing also in vhost_dev_stop() where we disable vrings. [1] https://gitlab.com/virtio-fs/virtiofsd [2] https://github.com/rust-vmm/vhost/blob/240fc2966/crates/vhost-user-backend/src/event_loop.rs#L217 Fixes: 02b61f38d3 ("hw/virtio: incorporate backend features in features") Reported-by: German Maglione <gmaglione@redhat.com> Tested-by: German Maglione <gmaglione@redhat.com> Signed-off-by: Stefano Garzarella <sgarzare@redhat.com> Acked-by: Raphael Norwitz <raphael.norwitz@nutanix.com> Message-Id: <20221123131630.52020-1-sgarzare@redhat.com> Signed-off-by: Alex Bennée <alex.bennee@linaro.org> Reviewed-by: Michael S. Tsirkin <mst@redhat.com> Message-Id: <20221130112439.2527228-3-alex.bennee@linaro.org> Signed-off-by: Michael S. Tsirkin <mst@redhat.com>		2022-12-01 02:30:04 -05:00
..
emulation.c
esp-pci.c
esp.c	Fix several typos in documentation (found by codespell)	2022-11-11 09:39:25 +01:00
Kconfig
lsi53c895a.c	scsi: Use device_cold_reset() and bus_cold_reset()	2022-10-18 13:58:04 +02:00
megasas.c	scsi: Use device_cold_reset() and bus_cold_reset()	2022-10-18 13:58:04 +02:00
meson.build
mfi.h
mpi.h
mptconfig.c
mptendian.c
mptsas.c	scsi: Use device_cold_reset() and bus_cold_reset()	2022-10-18 13:58:04 +02:00
mptsas.h
scsi-bus.c	virtio-scsi: Send "REPORTED LUNS CHANGED" sense data upon disk hotplug events	2022-10-13 23:38:33 +02:00
scsi-disk.c
scsi-generic.c
spapr_vscsi.c	scsi: Use device_cold_reset() and bus_cold_reset()	2022-10-18 13:58:04 +02:00
srp.h
trace-events
trace.h
vhost-scsi-common.c	vhost: enable vrings in vhost_dev_start() for vhost-user devices	2022-12-01 02:30:04 -05:00
vhost-scsi.c	vhost: mask VIRTIO_F_RING_RESET for vhost and vhost-user devices	2022-11-22 05:19:00 -05:00
vhost-user-scsi.c	vhost: mask VIRTIO_F_RING_RESET for vhost and vhost-user devices	2022-11-22 05:19:00 -05:00
viosrp.h
virtio-scsi-dataplane.c
virtio-scsi.c	scsi: Use device_cold_reset() and bus_cold_reset()	2022-10-18 13:58:04 +02:00
vmw_pvscsi.c	hw/scsi/vmw_pvscsi.c: Use device_cold_reset() to reset SCSI devices	2022-10-18 13:58:04 +02:00
vmw_pvscsi.h