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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>		3 years ago
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Kconfig	build: move vhost-scsi configuration to Kconfig	4 years ago
emulation.c	scsi-generic: avoid invalid access to struct when emulating block limits	7 years ago
esp-pci.c	pci: Let pci_dma_rw() take MemTxAttrs argument	4 years ago
esp.c	Fix several typos in documentation (found by codespell)	3 years ago
lsi53c895a.c	scsi: Use device_cold_reset() and bus_cold_reset()	3 years ago
megasas.c	scsi: Use device_cold_reset() and bus_cold_reset()	3 years ago
meson.build	meson: convert hw/scsi	5 years ago
mfi.h	Fix 'writeable' typos	3 years ago
mpi.h	hw: Add support for LSI SAS1068 (mptsas) device	10 years ago
mptconfig.c	nomaintainer: Fix Lesser GPL version number	5 years ago
mptendian.c	nomaintainer: Fix Lesser GPL version number	5 years ago
mptsas.c	scsi: Use device_cold_reset() and bus_cold_reset()	3 years ago
mptsas.h	mptsas: Remove unused MPTSASState 'pending' field (CVE-2021-3392)	5 years ago
scsi-bus.c	virtio-scsi: Send "REPORTED LUNS CHANGED" sense data upon disk hotplug events	3 years ago
scsi-disk.c	scsi-disk: support setting CD-ROM block size via device options	3 years ago
scsi-generic.c	scsi: Add buf_len parameter to scsi_req_new()	3 years ago
spapr_vscsi.c	scsi: Use device_cold_reset() and bus_cold_reset()	3 years ago
srp.h	spapr-vscsi: add task management	12 years ago
trace-events	scsi-disk: allow MODE SELECT block descriptor to set the block size	3 years ago
trace.h	trace: switch position of headers to what Meson requires	5 years ago
vhost-scsi-common.c	vhost: enable vrings in vhost_dev_start() for vhost-user devices	3 years ago
vhost-scsi.c	vhost: mask VIRTIO_F_RING_RESET for vhost and vhost-user devices	3 years ago
vhost-user-scsi.c	vhost: mask VIRTIO_F_RING_RESET for vhost and vhost-user devices	3 years ago
viosrp.h	hw/scsi/spapr_vscsi: Do not mix SRP IU size with DMA buffer size	6 years ago
virtio-scsi-dataplane.c	virtio-scsi: fix race in virtio_scsi_dataplane_start()	3 years ago
virtio-scsi.c	scsi: Use device_cold_reset() and bus_cold_reset()	3 years ago
vmw_pvscsi.c	hw/scsi/vmw_pvscsi.c: Use device_cold_reset() to reset SCSI devices	3 years ago
vmw_pvscsi.h	scsi: VMWare PVSCSI paravirtual device implementation	13 years ago