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qemu-cr16/hw/virtio
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Hanna Czenczek 46228925ed vhost: Always initialize cached vring data 
vhost_virtqueue_start() can exit early if the descriptor ring address is
0, assuming the virtqueue isn’t ready to start.

In this case, all cached vring information (size, physical address,
pointer) is left as-is.  This is OK at first startup, when that info is
still initialized to 0, but after a reset, it will retain old (outdated)
information.

vhost_virtqueue_start() must make sure these values are (re-)set
properly before exiting.

(When using an IOMMU, these outdated values can stall the device:
vhost_dev_start() deliberately produces an IOMMU miss event for each
used vring.  If used_phys contains an outdated value, the resulting
lookup may fail, forcing the device to be stopped.)

Cc: qemu-stable@nongnu.org
Signed-off-by: Hanna Czenczek <hreitz@redhat.com>
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Message-ID: <20251208113008.153249-1-hreitz@redhat.com>
Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
2025-12-09 20:48:39 +01:00
..
cbor-helpers.c device/virtio-nsm: Support for Nitro Secure Module device 2024-10-31 18:28:32 +01:00
iothread-vq-mapping.c virtio: extract iothread-vq-mapping.h API 2025-03-13 17:57:23 +01:00
Kconfig hw/virtio: rename vhost-user-device and make user creatable 2025-10-05 09:01:08 -04:00
meson.build hw/virtio: Compile virtio-mem.c once 2025-10-21 20:09:56 +02:00
trace-events virtio: unify virtio_notify_irqfd() and virtio_notify() 2025-10-05 09:01:08 -04:00
trace.h
vdpa-dev-pci.c qom: Have class_init() take a const data argument 2025-04-25 17:00:41 +02:00
vdpa-dev.c vdpa-dev: add get_vhost() callback for vhost-vdpa device 2025-10-05 16:13:02 -04:00
vhost-backend.c vhost-backend: implement extended features support 2025-10-04 10:50:37 -04:00
vhost-iova-tree.c vhost-iova-tree: Update documentation 2025-02-21 07:18:42 -05:00
vhost-iova-tree.h include/system: Move exec/memory.h to system/memory.h 2025-04-23 14:08:21 -07:00
vhost-scsi-pci.c qom: Have class_init() take a const data argument 2025-04-25 17:00:41 +02:00
vhost-shadow-virtqueue.c vdpa: Fix endian bugs in shadow virtqueue 2025-02-21 07:18:42 -05:00
vhost-shadow-virtqueue.h vhost-iova-tree, svq: Implement GPA->IOVA & partial IOVA->HVA trees 2025-02-21 07:18:42 -05:00
vhost-stub.c char: rename CharBackend->CharFrontend 2025-10-28 14:49:52 +01:00
vhost-user-base.c vhost-user: return failure if backend crash when live migration 2025-05-14 05:39:15 -04:00
vhost-user-blk-pci.c qom: Have class_init() take a const data argument 2025-04-25 17:00:41 +02:00
vhost-user-fs-pci.c qom: Have class_init() take a const data argument 2025-04-25 17:00:41 +02:00
vhost-user-fs.c vhost-user: return failure if backend crash when live migration 2025-05-14 05:39:15 -04:00
vhost-user-gpio-pci.c qom: Have class_init() take a const data argument 2025-04-25 17:00:41 +02:00
vhost-user-gpio.c qom: Have class_init() take a const data argument 2025-04-25 17:00:41 +02:00
vhost-user-i2c-pci.c qom: Have class_init() take a const data argument 2025-04-25 17:00:41 +02:00
vhost-user-i2c.c qom: Have class_init() take a const data argument 2025-04-25 17:00:41 +02:00
vhost-user-input-pci.c hw/virtio: derive vhost-user-input from vhost-user-base 2024-02-14 06:09:32 -05:00
vhost-user-input.c qom: Have class_init() take a const data argument 2025-04-25 17:00:41 +02:00
vhost-user-rng-pci.c qom: Have class_init() take a const data argument 2025-04-25 17:00:41 +02:00
vhost-user-rng.c qom: Have class_init() take a const data argument 2025-04-25 17:00:41 +02:00
vhost-user-scmi-pci.c qom: Have class_init() take a const data argument 2025-04-25 17:00:41 +02:00
vhost-user-scmi.c vhost-user: return failure if backend crash when live migration 2025-05-14 05:39:15 -04:00
vhost-user-scsi-pci.c qom: Have class_init() take a const data argument 2025-04-25 17:00:41 +02:00
vhost-user-snd-pci.c qom: Have class_init() take a const data argument 2025-04-25 17:00:41 +02:00
vhost-user-snd.c qom: Have class_init() take a const data argument 2025-04-25 17:00:41 +02:00
vhost-user-test-device-pci.c hw/virtio: rename vhost-user-device and make user creatable 2025-10-05 09:01:08 -04:00
vhost-user-test-device.c hw/virtio: rename vhost-user-device and make user creatable 2025-10-05 09:01:08 -04:00
vhost-user-vsock-pci.c qom: Have class_init() take a const data argument 2025-04-25 17:00:41 +02:00
vhost-user-vsock.c vhost-user: return failure if backend crash when live migration 2025-05-14 05:39:15 -04:00
vhost-user.c vhost-user: make vhost_set_vring_file() synchronous 2025-11-09 08:24:29 -05:00
vhost-vdpa.c vfio: return mr from vfio_get_xlat_addr 2025-06-05 10:40:38 +02:00
vhost-vsock-common.c vhost-user: return failure if backend crash when live migration 2025-05-14 05:39:15 -04:00
vhost-vsock-pci.c qom: Have class_init() take a const data argument 2025-04-25 17:00:41 +02:00
vhost-vsock.c hw/virtio: Use error_setg_file_open() for a better error message 2025-11-25 22:41:52 +01:00
vhost.c vhost: Always initialize cached vring data 2025-12-09 20:48:39 +01:00
virtio-9p-pci.c qom: Have class_init() take a const data argument 2025-04-25 17:00:41 +02:00
virtio-acpi.c license: Update deprecated SPDX tag GPL-2.0+ to GPL-2.0-or-later 2024-09-20 10:11:59 +03:00
virtio-balloon-pci.c qom: Have class_init() take a const data argument 2025-04-25 17:00:41 +02:00
virtio-balloon.c system/ramblock: Move ram_block_discard_*_range() declarations 2025-10-07 03:37:03 +02:00
virtio-blk-pci.c qom: Have class_init() take a const data argument 2025-04-25 17:00:41 +02:00
virtio-bus.c virtio: add support for negotiating extended features 2025-10-04 10:50:37 -04:00
virtio-config-io.c hw/virtio: Build various files once 2025-07-15 02:56:39 -04:00
virtio-crypto-pci.c qom: Have class_init() take a const data argument 2025-04-25 17:00:41 +02:00
virtio-crypto.c vhost-user: return failure if backend crash when live migration 2025-05-14 05:39:15 -04:00
virtio-hmp-cmds.c qmp: update virtio features map to support extended features 2025-10-04 10:50:37 -04:00
virtio-input-host-pci.c
virtio-input-pci.c qom: Have class_init() take a const data argument 2025-04-25 17:00:41 +02:00
virtio-iommu-pci.c qom: Have class_init() take a const data argument 2025-04-25 17:00:41 +02:00
virtio-iommu.c vhost-user: return failure if backend crash when live migration 2025-05-14 05:39:15 -04:00
virtio-md-pci.c qom: Make InterfaceInfo[] uses const 2025-04-25 17:00:41 +02:00
virtio-md-stubs.c hw/virtio: move stubs out of stubs/ 2024-04-18 11:17:27 +02:00
virtio-mem-pci.c qom: Have class_init() take a const data argument 2025-04-25 17:00:41 +02:00
virtio-mem-pci.h virtio-md-pci: New parent type for virtio-mem-pci and virtio-pmem-pci 2023-07-12 09:27:25 +02:00
virtio-mem.c hw/virtio/virtio-mem: Convert VIRTIO_MEM_HAS_LEGACY_GUESTS to runtime 2025-10-21 20:09:56 +02:00
virtio-mmio.c migration: Fix regression of passing error_fatal into vmstate_load_state() 2025-11-03 16:04:10 -05:00
virtio-net-pci.c virtio-net: Implement SR-IOV VF 2025-05-14 05:39:14 -04:00
virtio-nsm-pci.c qom: Have class_init() take a const data argument 2025-04-25 17:00:41 +02:00
virtio-nsm.c qom: Have class_init() take a const data argument 2025-04-25 17:00:41 +02:00
virtio-pci.c migration: Fix regression of passing error_fatal into vmstate_load_state() 2025-11-03 16:04:10 -05:00
virtio-pmem-pci.c qom: Have class_init() take a const data argument 2025-04-25 17:00:41 +02:00
virtio-pmem-pci.h virtio-md-pci: New parent type for virtio-mem-pci and virtio-pmem-pci 2023-07-12 09:27:25 +02:00
virtio-pmem.c qom: Have class_init() take a const data argument 2025-04-25 17:00:41 +02:00
virtio-qmp.c qmp: Fix a typo for a USO feature 2025-11-21 15:47:58 +03:00
virtio-qmp.h qmp: update virtio features map to support extended features 2025-10-04 10:50:37 -04:00
virtio-rng-pci.c qom: Have class_init() take a const data argument 2025-04-25 17:00:41 +02:00
virtio-rng.c vhost-user: return failure if backend crash when live migration 2025-05-14 05:39:15 -04:00
virtio-scsi-pci.c qom: Have class_init() take a const data argument 2025-04-25 17:00:41 +02:00
virtio-serial-pci.c qom: Have class_init() take a const data argument 2025-04-25 17:00:41 +02:00
virtio-stub.c
virtio.c migration: Fix regression of passing error_fatal into vmstate_load_state() 2025-11-03 16:04:10 -05:00