2d4ba6cc74
In case of backend crash, it is not possible to restore internal avail index from the backend value as vhost_get_vring_base callback fails. This patch provides a new interface to restore internal avail index from the vring used index, as done by some vhost-user backend on reconnection. Signed-off-by: Maxime Coquelin <maxime.coquelin@redhat.com> Reviewed-by: Michael S. Tsirkin <mst@redhat.com> Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
335 lines
13 KiB
C
335 lines
13 KiB
C
/*
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* Virtio Support
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*
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* Copyright IBM, Corp. 2007
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*
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* Authors:
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* Anthony Liguori <aliguori@us.ibm.com>
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*
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* This work is licensed under the terms of the GNU GPL, version 2. See
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* the COPYING file in the top-level directory.
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*
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*/
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#ifndef QEMU_VIRTIO_H
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#define QEMU_VIRTIO_H
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#include "hw/hw.h"
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#include "net/net.h"
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#include "hw/qdev.h"
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#include "sysemu/sysemu.h"
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#include "qemu/event_notifier.h"
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#include "standard-headers/linux/virtio_config.h"
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#include "standard-headers/linux/virtio_ring.h"
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/* A guest should never accept this. It implies negotiation is broken. */
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#define VIRTIO_F_BAD_FEATURE 30
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#define VIRTIO_LEGACY_FEATURES ((0x1ULL << VIRTIO_F_BAD_FEATURE) | \
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(0x1ULL << VIRTIO_F_NOTIFY_ON_EMPTY) | \
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(0x1ULL << VIRTIO_F_ANY_LAYOUT))
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struct VirtQueue;
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static inline hwaddr vring_align(hwaddr addr,
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unsigned long align)
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{
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return QEMU_ALIGN_UP(addr, align);
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}
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typedef struct VirtQueue VirtQueue;
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#define VIRTQUEUE_MAX_SIZE 1024
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typedef struct VirtQueueElement
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{
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unsigned int index;
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unsigned int out_num;
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unsigned int in_num;
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hwaddr *in_addr;
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hwaddr *out_addr;
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struct iovec *in_sg;
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struct iovec *out_sg;
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} VirtQueueElement;
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#define VIRTIO_QUEUE_MAX 1024
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#define VIRTIO_NO_VECTOR 0xffff
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#define TYPE_VIRTIO_DEVICE "virtio-device"
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#define VIRTIO_DEVICE_GET_CLASS(obj) \
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OBJECT_GET_CLASS(VirtioDeviceClass, obj, TYPE_VIRTIO_DEVICE)
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#define VIRTIO_DEVICE_CLASS(klass) \
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OBJECT_CLASS_CHECK(VirtioDeviceClass, klass, TYPE_VIRTIO_DEVICE)
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#define VIRTIO_DEVICE(obj) \
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OBJECT_CHECK(VirtIODevice, (obj), TYPE_VIRTIO_DEVICE)
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enum virtio_device_endian {
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VIRTIO_DEVICE_ENDIAN_UNKNOWN,
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VIRTIO_DEVICE_ENDIAN_LITTLE,
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VIRTIO_DEVICE_ENDIAN_BIG,
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};
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struct VirtIODevice
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{
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DeviceState parent_obj;
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const char *name;
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uint8_t status;
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uint8_t isr;
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uint16_t queue_sel;
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uint64_t guest_features;
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uint64_t host_features;
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uint64_t backend_features;
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size_t config_len;
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void *config;
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uint16_t config_vector;
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uint32_t generation;
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int nvectors;
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VirtQueue *vq;
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MemoryListener listener;
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uint16_t device_id;
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bool vm_running;
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bool broken; /* device in invalid state, needs reset */
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VMChangeStateEntry *vmstate;
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char *bus_name;
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uint8_t device_endian;
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bool use_guest_notifier_mask;
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AddressSpace *dma_as;
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QLIST_HEAD(, VirtQueue) *vector_queues;
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};
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typedef struct VirtioDeviceClass {
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/*< private >*/
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DeviceClass parent;
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/*< public >*/
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/* This is what a VirtioDevice must implement */
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DeviceRealize realize;
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DeviceUnrealize unrealize;
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uint64_t (*get_features)(VirtIODevice *vdev,
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uint64_t requested_features,
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Error **errp);
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uint64_t (*bad_features)(VirtIODevice *vdev);
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void (*set_features)(VirtIODevice *vdev, uint64_t val);
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int (*validate_features)(VirtIODevice *vdev);
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void (*get_config)(VirtIODevice *vdev, uint8_t *config);
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void (*set_config)(VirtIODevice *vdev, const uint8_t *config);
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void (*reset)(VirtIODevice *vdev);
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void (*set_status)(VirtIODevice *vdev, uint8_t val);
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/* For transitional devices, this is a bitmap of features
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* that are only exposed on the legacy interface but not
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* the modern one.
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*/
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uint64_t legacy_features;
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/* Test and clear event pending status.
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* Should be called after unmask to avoid losing events.
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* If backend does not support masking,
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* must check in frontend instead.
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*/
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bool (*guest_notifier_pending)(VirtIODevice *vdev, int n);
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/* Mask/unmask events from this vq. Any events reported
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* while masked will become pending.
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* If backend does not support masking,
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* must mask in frontend instead.
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*/
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void (*guest_notifier_mask)(VirtIODevice *vdev, int n, bool mask);
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int (*start_ioeventfd)(VirtIODevice *vdev);
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void (*stop_ioeventfd)(VirtIODevice *vdev);
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/* Saving and loading of a device; trying to deprecate save/load
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* use vmsd for new devices.
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*/
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void (*save)(VirtIODevice *vdev, QEMUFile *f);
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int (*load)(VirtIODevice *vdev, QEMUFile *f, int version_id);
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const VMStateDescription *vmsd;
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} VirtioDeviceClass;
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void virtio_instance_init_common(Object *proxy_obj, void *data,
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size_t vdev_size, const char *vdev_name);
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void virtio_init(VirtIODevice *vdev, const char *name,
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uint16_t device_id, size_t config_size);
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void virtio_cleanup(VirtIODevice *vdev);
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void virtio_error(VirtIODevice *vdev, const char *fmt, ...) GCC_FMT_ATTR(2, 3);
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/* Set the child bus name. */
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void virtio_device_set_child_bus_name(VirtIODevice *vdev, char *bus_name);
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typedef void (*VirtIOHandleOutput)(VirtIODevice *, VirtQueue *);
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typedef bool (*VirtIOHandleAIOOutput)(VirtIODevice *, VirtQueue *);
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VirtQueue *virtio_add_queue(VirtIODevice *vdev, int queue_size,
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VirtIOHandleOutput handle_output);
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void virtio_del_queue(VirtIODevice *vdev, int n);
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void virtqueue_push(VirtQueue *vq, const VirtQueueElement *elem,
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unsigned int len);
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void virtqueue_flush(VirtQueue *vq, unsigned int count);
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void virtqueue_detach_element(VirtQueue *vq, const VirtQueueElement *elem,
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unsigned int len);
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void virtqueue_unpop(VirtQueue *vq, const VirtQueueElement *elem,
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unsigned int len);
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bool virtqueue_rewind(VirtQueue *vq, unsigned int num);
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void virtqueue_fill(VirtQueue *vq, const VirtQueueElement *elem,
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unsigned int len, unsigned int idx);
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void virtqueue_map(VirtIODevice *vdev, VirtQueueElement *elem);
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void *virtqueue_pop(VirtQueue *vq, size_t sz);
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unsigned int virtqueue_drop_all(VirtQueue *vq);
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void *qemu_get_virtqueue_element(VirtIODevice *vdev, QEMUFile *f, size_t sz);
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void qemu_put_virtqueue_element(QEMUFile *f, VirtQueueElement *elem);
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int virtqueue_avail_bytes(VirtQueue *vq, unsigned int in_bytes,
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unsigned int out_bytes);
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void virtqueue_get_avail_bytes(VirtQueue *vq, unsigned int *in_bytes,
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unsigned int *out_bytes,
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unsigned max_in_bytes, unsigned max_out_bytes);
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void virtio_notify_irqfd(VirtIODevice *vdev, VirtQueue *vq);
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void virtio_notify(VirtIODevice *vdev, VirtQueue *vq);
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int virtio_save(VirtIODevice *vdev, QEMUFile *f);
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extern const VMStateInfo virtio_vmstate_info;
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#define VMSTATE_VIRTIO_DEVICE \
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{ \
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.name = "virtio", \
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.info = &virtio_vmstate_info, \
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.flags = VMS_SINGLE, \
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}
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int virtio_load(VirtIODevice *vdev, QEMUFile *f, int version_id);
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void virtio_notify_config(VirtIODevice *vdev);
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void virtio_queue_set_notification(VirtQueue *vq, int enable);
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int virtio_queue_ready(VirtQueue *vq);
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int virtio_queue_empty(VirtQueue *vq);
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/* Host binding interface. */
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uint32_t virtio_config_readb(VirtIODevice *vdev, uint32_t addr);
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uint32_t virtio_config_readw(VirtIODevice *vdev, uint32_t addr);
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uint32_t virtio_config_readl(VirtIODevice *vdev, uint32_t addr);
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void virtio_config_writeb(VirtIODevice *vdev, uint32_t addr, uint32_t data);
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void virtio_config_writew(VirtIODevice *vdev, uint32_t addr, uint32_t data);
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void virtio_config_writel(VirtIODevice *vdev, uint32_t addr, uint32_t data);
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uint32_t virtio_config_modern_readb(VirtIODevice *vdev, uint32_t addr);
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uint32_t virtio_config_modern_readw(VirtIODevice *vdev, uint32_t addr);
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uint32_t virtio_config_modern_readl(VirtIODevice *vdev, uint32_t addr);
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void virtio_config_modern_writeb(VirtIODevice *vdev,
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uint32_t addr, uint32_t data);
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void virtio_config_modern_writew(VirtIODevice *vdev,
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uint32_t addr, uint32_t data);
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void virtio_config_modern_writel(VirtIODevice *vdev,
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uint32_t addr, uint32_t data);
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void virtio_queue_set_addr(VirtIODevice *vdev, int n, hwaddr addr);
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hwaddr virtio_queue_get_addr(VirtIODevice *vdev, int n);
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void virtio_queue_set_num(VirtIODevice *vdev, int n, int num);
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int virtio_queue_get_num(VirtIODevice *vdev, int n);
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int virtio_queue_get_max_num(VirtIODevice *vdev, int n);
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int virtio_get_num_queues(VirtIODevice *vdev);
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void virtio_queue_set_rings(VirtIODevice *vdev, int n, hwaddr desc,
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hwaddr avail, hwaddr used);
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void virtio_queue_update_rings(VirtIODevice *vdev, int n);
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void virtio_queue_set_align(VirtIODevice *vdev, int n, int align);
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void virtio_queue_notify(VirtIODevice *vdev, int n);
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uint16_t virtio_queue_vector(VirtIODevice *vdev, int n);
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void virtio_queue_set_vector(VirtIODevice *vdev, int n, uint16_t vector);
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int virtio_set_status(VirtIODevice *vdev, uint8_t val);
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void virtio_reset(void *opaque);
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void virtio_update_irq(VirtIODevice *vdev);
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int virtio_set_features(VirtIODevice *vdev, uint64_t val);
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/* Base devices. */
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typedef struct VirtIOBlkConf VirtIOBlkConf;
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struct virtio_net_conf;
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typedef struct virtio_serial_conf virtio_serial_conf;
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typedef struct virtio_input_conf virtio_input_conf;
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typedef struct VirtIOSCSIConf VirtIOSCSIConf;
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typedef struct VirtIORNGConf VirtIORNGConf;
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#define DEFINE_VIRTIO_COMMON_FEATURES(_state, _field) \
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DEFINE_PROP_BIT64("indirect_desc", _state, _field, \
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VIRTIO_RING_F_INDIRECT_DESC, true), \
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DEFINE_PROP_BIT64("event_idx", _state, _field, \
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VIRTIO_RING_F_EVENT_IDX, true), \
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DEFINE_PROP_BIT64("notify_on_empty", _state, _field, \
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VIRTIO_F_NOTIFY_ON_EMPTY, true), \
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DEFINE_PROP_BIT64("any_layout", _state, _field, \
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VIRTIO_F_ANY_LAYOUT, true), \
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DEFINE_PROP_BIT64("iommu_platform", _state, _field, \
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VIRTIO_F_IOMMU_PLATFORM, false)
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hwaddr virtio_queue_get_desc_addr(VirtIODevice *vdev, int n);
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hwaddr virtio_queue_get_avail_addr(VirtIODevice *vdev, int n);
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hwaddr virtio_queue_get_used_addr(VirtIODevice *vdev, int n);
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hwaddr virtio_queue_get_desc_size(VirtIODevice *vdev, int n);
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hwaddr virtio_queue_get_avail_size(VirtIODevice *vdev, int n);
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hwaddr virtio_queue_get_used_size(VirtIODevice *vdev, int n);
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uint16_t virtio_queue_get_last_avail_idx(VirtIODevice *vdev, int n);
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void virtio_queue_set_last_avail_idx(VirtIODevice *vdev, int n, uint16_t idx);
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void virtio_queue_restore_last_avail_idx(VirtIODevice *vdev, int n);
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void virtio_queue_invalidate_signalled_used(VirtIODevice *vdev, int n);
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void virtio_queue_update_used_idx(VirtIODevice *vdev, int n);
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VirtQueue *virtio_get_queue(VirtIODevice *vdev, int n);
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uint16_t virtio_get_queue_index(VirtQueue *vq);
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EventNotifier *virtio_queue_get_guest_notifier(VirtQueue *vq);
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void virtio_queue_set_guest_notifier_fd_handler(VirtQueue *vq, bool assign,
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bool with_irqfd);
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int virtio_device_start_ioeventfd(VirtIODevice *vdev);
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void virtio_device_stop_ioeventfd(VirtIODevice *vdev);
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int virtio_device_grab_ioeventfd(VirtIODevice *vdev);
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void virtio_device_release_ioeventfd(VirtIODevice *vdev);
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bool virtio_device_ioeventfd_enabled(VirtIODevice *vdev);
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EventNotifier *virtio_queue_get_host_notifier(VirtQueue *vq);
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void virtio_queue_host_notifier_read(EventNotifier *n);
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void virtio_queue_aio_set_host_notifier_handler(VirtQueue *vq, AioContext *ctx,
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VirtIOHandleAIOOutput handle_output);
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VirtQueue *virtio_vector_first_queue(VirtIODevice *vdev, uint16_t vector);
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VirtQueue *virtio_vector_next_queue(VirtQueue *vq);
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static inline void virtio_add_feature(uint64_t *features, unsigned int fbit)
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{
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assert(fbit < 64);
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*features |= (1ULL << fbit);
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}
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static inline void virtio_clear_feature(uint64_t *features, unsigned int fbit)
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{
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assert(fbit < 64);
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*features &= ~(1ULL << fbit);
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}
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static inline bool virtio_has_feature(uint64_t features, unsigned int fbit)
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{
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assert(fbit < 64);
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return !!(features & (1ULL << fbit));
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}
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static inline bool virtio_vdev_has_feature(VirtIODevice *vdev,
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unsigned int fbit)
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{
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return virtio_has_feature(vdev->guest_features, fbit);
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}
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static inline bool virtio_host_has_feature(VirtIODevice *vdev,
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unsigned int fbit)
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{
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return virtio_has_feature(vdev->host_features, fbit);
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}
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static inline bool virtio_is_big_endian(VirtIODevice *vdev)
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{
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if (!virtio_vdev_has_feature(vdev, VIRTIO_F_VERSION_1)) {
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assert(vdev->device_endian != VIRTIO_DEVICE_ENDIAN_UNKNOWN);
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return vdev->device_endian == VIRTIO_DEVICE_ENDIAN_BIG;
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}
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/* Devices conforming to VIRTIO 1.0 or later are always LE. */
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return false;
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}
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#endif
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