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qemu/include/hw/virtio/virtio.h
Stefan Hajnoczi 297a75e6c5 virtio: add virtqueue_rewind() 
virtqueue_discard() requires a VirtQueueElement but virtio-balloon does
not migrate its in-use element.  Introduce a new function that is
similar to virtqueue_discard() but doesn't require a VirtQueueElement.

This will allow virtio-balloon to access element again after migration
with the usual proviso that the guest may have modified the vring since
last time.

Cc: Michael S. Tsirkin <mst@redhat.com>
Cc: Roman Kagan <rkagan@virtuozzo.com>
Cc: Stefan Hajnoczi <stefanha@redhat.com>
Signed-off-by: Ladi Prosek <lprosek@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
2016-09-09 20:58:34 +03:00

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/*
* Virtio Support
*
* Copyright IBM, Corp. 2007
*
* Authors:
* Anthony Liguori <aliguori@us.ibm.com>
*
* This work is licensed under the terms of the GNU GPL, version 2. See
* the COPYING file in the top-level directory.
*
*/
#ifndef QEMU_VIRTIO_H
#define QEMU_VIRTIO_H
#include "hw/hw.h"
#include "net/net.h"
#include "hw/qdev.h"
#include "sysemu/sysemu.h"
#include "qemu/event_notifier.h"
#include "standard-headers/linux/virtio_config.h"
#include "standard-headers/linux/virtio_ring.h"
/* A guest should never accept this. It implies negotiation is broken. */
#define VIRTIO_F_BAD_FEATURE 30
#define VIRTIO_LEGACY_FEATURES ((0x1ULL << VIRTIO_F_BAD_FEATURE) | \
(0x1ULL << VIRTIO_F_NOTIFY_ON_EMPTY) | \
(0x1ULL << VIRTIO_F_ANY_LAYOUT))
struct VirtQueue;
static inline hwaddr vring_align(hwaddr addr,
unsigned long align)
{
return (addr + align - 1) & ~(align - 1);
}
typedef struct VirtQueue VirtQueue;
#define VIRTQUEUE_MAX_SIZE 1024
typedef struct VirtQueueElement
{
unsigned int index;
unsigned int out_num;
unsigned int in_num;
hwaddr *in_addr;
hwaddr *out_addr;
struct iovec *in_sg;
struct iovec *out_sg;
} VirtQueueElement;
#define VIRTIO_QUEUE_MAX 1024
#define VIRTIO_NO_VECTOR 0xffff
#define TYPE_VIRTIO_DEVICE "virtio-device"
#define VIRTIO_DEVICE_GET_CLASS(obj) \
OBJECT_GET_CLASS(VirtioDeviceClass, obj, TYPE_VIRTIO_DEVICE)
#define VIRTIO_DEVICE_CLASS(klass) \
OBJECT_CLASS_CHECK(VirtioDeviceClass, klass, TYPE_VIRTIO_DEVICE)
#define VIRTIO_DEVICE(obj) \
OBJECT_CHECK(VirtIODevice, (obj), TYPE_VIRTIO_DEVICE)
enum virtio_device_endian {
VIRTIO_DEVICE_ENDIAN_UNKNOWN,
VIRTIO_DEVICE_ENDIAN_LITTLE,
VIRTIO_DEVICE_ENDIAN_BIG,
};
struct VirtIODevice
{
DeviceState parent_obj;
const char *name;
uint8_t status;
uint8_t isr;
uint16_t queue_sel;
uint64_t guest_features;
uint64_t host_features;
size_t config_len;
void *config;
uint16_t config_vector;
uint32_t generation;
int nvectors;
VirtQueue *vq;
uint16_t device_id;
bool vm_running;
VMChangeStateEntry *vmstate;
char *bus_name;
uint8_t device_endian;
bool use_guest_notifier_mask;
QLIST_HEAD(, VirtQueue) *vector_queues;
};
typedef struct VirtioDeviceClass {
/*< private >*/
DeviceClass parent;
/*< public >*/
/* This is what a VirtioDevice must implement */
DeviceRealize realize;
DeviceUnrealize unrealize;
uint64_t (*get_features)(VirtIODevice *vdev,
uint64_t requested_features,
Error **errp);
uint64_t (*bad_features)(VirtIODevice *vdev);
void (*set_features)(VirtIODevice *vdev, uint64_t val);
int (*validate_features)(VirtIODevice *vdev);
void (*get_config)(VirtIODevice *vdev, uint8_t *config);
void (*set_config)(VirtIODevice *vdev, const uint8_t *config);
void (*reset)(VirtIODevice *vdev);
void (*set_status)(VirtIODevice *vdev, uint8_t val);
/* Test and clear event pending status.
* Should be called after unmask to avoid losing events.
* If backend does not support masking,
* must check in frontend instead.
*/
bool (*guest_notifier_pending)(VirtIODevice *vdev, int n);
/* Mask/unmask events from this vq. Any events reported
* while masked will become pending.
* If backend does not support masking,
* must mask in frontend instead.
*/
void (*guest_notifier_mask)(VirtIODevice *vdev, int n, bool mask);
void (*save)(VirtIODevice *vdev, QEMUFile *f);
int (*load)(VirtIODevice *vdev, QEMUFile *f, int version_id);
} VirtioDeviceClass;
void virtio_instance_init_common(Object *proxy_obj, void *data,
size_t vdev_size, const char *vdev_name);
void virtio_init(VirtIODevice *vdev, const char *name,
uint16_t device_id, size_t config_size);
void virtio_cleanup(VirtIODevice *vdev);
/* Set the child bus name. */
void virtio_device_set_child_bus_name(VirtIODevice *vdev, char *bus_name);
typedef void (*VirtIOHandleOutput)(VirtIODevice *, VirtQueue *);
VirtQueue *virtio_add_queue(VirtIODevice *vdev, int queue_size,
VirtIOHandleOutput handle_output);
VirtQueue *virtio_add_queue_aio(VirtIODevice *vdev, int queue_size,
VirtIOHandleOutput handle_output);
void virtio_del_queue(VirtIODevice *vdev, int n);
void *virtqueue_alloc_element(size_t sz, unsigned out_num, unsigned in_num);
void virtqueue_push(VirtQueue *vq, const VirtQueueElement *elem,
unsigned int len);
void virtqueue_flush(VirtQueue *vq, unsigned int count);
void virtqueue_discard(VirtQueue *vq, const VirtQueueElement *elem,
unsigned int len);
bool virtqueue_rewind(VirtQueue *vq, unsigned int num);
void virtqueue_fill(VirtQueue *vq, const VirtQueueElement *elem,
unsigned int len, unsigned int idx);
void virtqueue_map(VirtQueueElement *elem);
void *virtqueue_pop(VirtQueue *vq, size_t sz);
void *qemu_get_virtqueue_element(QEMUFile *f, size_t sz);
void qemu_put_virtqueue_element(QEMUFile *f, VirtQueueElement *elem);
int virtqueue_avail_bytes(VirtQueue *vq, unsigned int in_bytes,
unsigned int out_bytes);
void virtqueue_get_avail_bytes(VirtQueue *vq, unsigned int *in_bytes,
unsigned int *out_bytes,
unsigned max_in_bytes, unsigned max_out_bytes);
bool virtio_should_notify(VirtIODevice *vdev, VirtQueue *vq);
void virtio_notify(VirtIODevice *vdev, VirtQueue *vq);
void virtio_save(VirtIODevice *vdev, QEMUFile *f);
void virtio_vmstate_save(QEMUFile *f, void *opaque, size_t size);
#define VMSTATE_VIRTIO_DEVICE(devname, v, getf, putf) \
static const VMStateDescription vmstate_virtio_ ## devname = { \
.name = "virtio-" #devname , \
.minimum_version_id = v, \
.version_id = v, \
.fields = (VMStateField[]) { \
{ \
.name = "virtio", \
.info = &(const VMStateInfo) {\
.name = "virtio", \
.get = getf, \
.put = putf, \
}, \
.flags = VMS_SINGLE, \
}, \
VMSTATE_END_OF_LIST() \
} \
}
int virtio_load(VirtIODevice *vdev, QEMUFile *f, int version_id);
void virtio_notify_config(VirtIODevice *vdev);
void virtio_queue_set_notification(VirtQueue *vq, int enable);
int virtio_queue_ready(VirtQueue *vq);
int virtio_queue_empty(VirtQueue *vq);
/* Host binding interface. */
uint32_t virtio_config_readb(VirtIODevice *vdev, uint32_t addr);
uint32_t virtio_config_readw(VirtIODevice *vdev, uint32_t addr);
uint32_t virtio_config_readl(VirtIODevice *vdev, uint32_t addr);
void virtio_config_writeb(VirtIODevice *vdev, uint32_t addr, uint32_t data);
void virtio_config_writew(VirtIODevice *vdev, uint32_t addr, uint32_t data);
void virtio_config_writel(VirtIODevice *vdev, uint32_t addr, uint32_t data);
uint32_t virtio_config_modern_readb(VirtIODevice *vdev, uint32_t addr);
uint32_t virtio_config_modern_readw(VirtIODevice *vdev, uint32_t addr);
uint32_t virtio_config_modern_readl(VirtIODevice *vdev, uint32_t addr);
void virtio_config_modern_writeb(VirtIODevice *vdev,
uint32_t addr, uint32_t data);
void virtio_config_modern_writew(VirtIODevice *vdev,
uint32_t addr, uint32_t data);
void virtio_config_modern_writel(VirtIODevice *vdev,
uint32_t addr, uint32_t data);
void virtio_queue_set_addr(VirtIODevice *vdev, int n, hwaddr addr);
hwaddr virtio_queue_get_addr(VirtIODevice *vdev, int n);
void virtio_queue_set_num(VirtIODevice *vdev, int n, int num);
int virtio_queue_get_num(VirtIODevice *vdev, int n);
int virtio_get_num_queues(VirtIODevice *vdev);
void virtio_queue_set_rings(VirtIODevice *vdev, int n, hwaddr desc,
hwaddr avail, hwaddr used);
void virtio_queue_update_rings(VirtIODevice *vdev, int n);
void virtio_queue_set_align(VirtIODevice *vdev, int n, int align);
void virtio_queue_notify(VirtIODevice *vdev, int n);
uint16_t virtio_queue_vector(VirtIODevice *vdev, int n);
void virtio_queue_set_vector(VirtIODevice *vdev, int n, uint16_t vector);
int virtio_set_status(VirtIODevice *vdev, uint8_t val);
void virtio_reset(void *opaque);
void virtio_update_irq(VirtIODevice *vdev);
int virtio_set_features(VirtIODevice *vdev, uint64_t val);
/* Base devices. */
typedef struct VirtIOBlkConf VirtIOBlkConf;
struct virtio_net_conf;
typedef struct virtio_serial_conf virtio_serial_conf;
typedef struct virtio_input_conf virtio_input_conf;
typedef struct VirtIOSCSIConf VirtIOSCSIConf;
typedef struct VirtIORNGConf VirtIORNGConf;
#define DEFINE_VIRTIO_COMMON_FEATURES(_state, _field) \
DEFINE_PROP_BIT64("indirect_desc", _state, _field, \
VIRTIO_RING_F_INDIRECT_DESC, true), \
DEFINE_PROP_BIT64("event_idx", _state, _field, \
VIRTIO_RING_F_EVENT_IDX, true), \
DEFINE_PROP_BIT64("notify_on_empty", _state, _field, \
VIRTIO_F_NOTIFY_ON_EMPTY, true), \
DEFINE_PROP_BIT64("any_layout", _state, _field, \
VIRTIO_F_ANY_LAYOUT, true)
hwaddr virtio_queue_get_desc_addr(VirtIODevice *vdev, int n);
hwaddr virtio_queue_get_avail_addr(VirtIODevice *vdev, int n);
hwaddr virtio_queue_get_used_addr(VirtIODevice *vdev, int n);
hwaddr virtio_queue_get_ring_addr(VirtIODevice *vdev, int n);
hwaddr virtio_queue_get_desc_size(VirtIODevice *vdev, int n);
hwaddr virtio_queue_get_avail_size(VirtIODevice *vdev, int n);
hwaddr virtio_queue_get_used_size(VirtIODevice *vdev, int n);
hwaddr virtio_queue_get_ring_size(VirtIODevice *vdev, int n);
uint16_t virtio_queue_get_last_avail_idx(VirtIODevice *vdev, int n);
void virtio_queue_set_last_avail_idx(VirtIODevice *vdev, int n, uint16_t idx);
void virtio_queue_invalidate_signalled_used(VirtIODevice *vdev, int n);
VirtQueue *virtio_get_queue(VirtIODevice *vdev, int n);
uint16_t virtio_get_queue_index(VirtQueue *vq);
EventNotifier *virtio_queue_get_guest_notifier(VirtQueue *vq);
void virtio_queue_set_guest_notifier_fd_handler(VirtQueue *vq, bool assign,
bool with_irqfd);
EventNotifier *virtio_queue_get_host_notifier(VirtQueue *vq);
void virtio_queue_set_host_notifier_fd_handler(VirtQueue *vq, bool assign,
bool set_handler);
void virtio_queue_aio_set_host_notifier_handler(VirtQueue *vq, AioContext *ctx,
void (*fn)(VirtIODevice *,
VirtQueue *));
void virtio_irq(VirtQueue *vq);
VirtQueue *virtio_vector_first_queue(VirtIODevice *vdev, uint16_t vector);
VirtQueue *virtio_vector_next_queue(VirtQueue *vq);
static inline void virtio_add_feature(uint64_t *features, unsigned int fbit)
{
assert(fbit < 64);
*features |= (1ULL << fbit);
}
static inline void virtio_clear_feature(uint64_t *features, unsigned int fbit)
{
assert(fbit < 64);
*features &= ~(1ULL << fbit);
}
static inline bool virtio_has_feature(uint64_t features, unsigned int fbit)
{
assert(fbit < 64);
return !!(features & (1ULL << fbit));
}
static inline bool virtio_vdev_has_feature(VirtIODevice *vdev,
unsigned int fbit)
{
return virtio_has_feature(vdev->guest_features, fbit);
}
static inline bool virtio_host_has_feature(VirtIODevice *vdev,
unsigned int fbit)
{
return virtio_has_feature(vdev->host_features, fbit);
}
static inline bool virtio_is_big_endian(VirtIODevice *vdev)
{
if (!virtio_vdev_has_feature(vdev, VIRTIO_F_VERSION_1)) {
assert(vdev->device_endian != VIRTIO_DEVICE_ENDIAN_UNKNOWN);
return vdev->device_endian == VIRTIO_DEVICE_ENDIAN_BIG;
}
/* Devices conforming to VIRTIO 1.0 or later are always LE. */
return false;
}
#endif
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