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mirror_qemu/include/hw/virtio/virtio.h

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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 "exec/memory.h"
#include "hw/qdev-core.h"
#include "net/net.h"
#include "migration/vmstate.h"
#include "qemu/event_notifier.h"
#include "standard-headers/linux/virtio_config.h"
#include "standard-headers/linux/virtio_ring.h"
#include "qom/object.h"
/*
* A guest should never accept this. It implies negotiation is broken
* between the driver frontend and the device. This bit is re-used for
* vhost-user to advertise VHOST_USER_F_PROTOCOL_FEATURES between QEMU
* and a vhost-user backend.
*/
#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 QEMU_ALIGN_UP(addr, align);
}
typedef struct VirtIOFeature {
uint64_t flags;
size_t end;
} VirtIOFeature;
typedef struct VirtIOConfigSizeParams {
size_t min_size;
size_t max_size;
const VirtIOFeature *feature_sizes;
} VirtIOConfigSizeParams;
size_t virtio_get_config_size(const VirtIOConfigSizeParams *params,
uint64_t host_features);
typedef struct VirtQueue VirtQueue;
#define VIRTQUEUE_MAX_SIZE 1024
typedef struct VirtQueueElement
{
unsigned int index;
unsigned int len;
unsigned int ndescs;
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
/* special index value used internally for config irqs */
#define VIRTIO_CONFIG_IRQ_IDX -1
#define TYPE_VIRTIO_DEVICE "virtio-device"
OBJECT_DECLARE_TYPE(VirtIODevice, VirtioDeviceClass, VIRTIO_DEVICE)
typedef struct {
int virtio_bit;
const char *feature_desc;
} qmp_virtio_feature_map_t;
enum virtio_device_endian {
VIRTIO_DEVICE_ENDIAN_UNKNOWN,
VIRTIO_DEVICE_ENDIAN_LITTLE,
VIRTIO_DEVICE_ENDIAN_BIG,
};
/**
* struct VirtIODevice - common VirtIO structure
* @name: name of the device
* @status: VirtIO Device Status field
*
*/
struct VirtIODevice
{
DeviceState parent_obj;
const char *name;
uint8_t status;
uint8_t isr;
uint16_t queue_sel;
/**
* These fields represent a set of VirtIO features at various
* levels of the stack. @host_features indicates the complete
* feature set the VirtIO device can offer to the driver.
* @guest_features indicates which features the VirtIO driver has
* selected by writing to the feature register. Finally
* @backend_features represents everything supported by the
* backend (e.g. vhost) and could potentially be a subset of the
* total feature set offered by QEMU.
*/
uint64_t host_features;
uint64_t guest_features;
uint64_t backend_features;
size_t config_len;
void *config;
uint16_t config_vector;
uint32_t generation;
int nvectors;
VirtQueue *vq;
MemoryListener listener;
uint16_t device_id;
/* @vm_running: current VM running state via virtio_vmstate_change() */
bool vm_running;
bool broken; /* device in invalid state, needs reset */
bool use_disabled_flag; /* allow use of 'disable' flag when needed */
bool disabled; /* device in temporarily disabled state */
/**
* @use_started: true if the @started flag should be used to check the
* current state of the VirtIO device. Otherwise status bits
* should be checked for a current status of the device.
* @use_started is only set via QMP and defaults to true for all
* modern machines (since 4.1).
*/
bool use_started;
bool started;
bool start_on_kick; /* when virtio 1.0 feature has not been negotiated */
bool disable_legacy_check;
bool vhost_started;
VMChangeStateEntry *vmstate;
char *bus_name;
uint8_t device_endian;
bool use_guest_notifier_mask;
AddressSpace *dma_as;
QLIST_HEAD(, VirtQueue) *vector_queues;
QTAILQ_ENTRY(VirtIODevice) next;
EventNotifier config_notifier;
};
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);
/* Device must validate queue_index. */
void (*queue_reset)(VirtIODevice *vdev, uint32_t queue_index);
/* Device must validate queue_index. */
void (*queue_enable)(VirtIODevice *vdev, uint32_t queue_index);
/* For transitional devices, this is a bitmap of features
* that are only exposed on the legacy interface but not
* the modern one.
*/
uint64_t legacy_features;
/* 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);
int (*start_ioeventfd)(VirtIODevice *vdev);
void (*stop_ioeventfd)(VirtIODevice *vdev);
/* Saving and loading of a device; trying to deprecate save/load
* use vmsd for new devices.
*/
void (*save)(VirtIODevice *vdev, QEMUFile *f);
int (*load)(VirtIODevice *vdev, QEMUFile *f, int version_id);
/* Post load hook in vmsd is called early while device is processed, and
* when VirtIODevice isn't fully initialized. Devices should use this instead,
* unless they specifically want to verify the migration stream as it's
* processed, e.g. for bounds checking.
*/
int (*post_load)(VirtIODevice *vdev);
const VMStateDescription *vmsd;
bool (*primary_unplug_pending)(void *opaque);
struct vhost_dev *(*get_vhost)(VirtIODevice *vdev);
};
void virtio_instance_init_common(Object *proxy_obj, void *data,
size_t vdev_size, const char *vdev_name);
void virtio_init(VirtIODevice *vdev, uint16_t device_id, size_t config_size);
void virtio_cleanup(VirtIODevice *vdev);
void virtio_error(VirtIODevice *vdev, const char *fmt, ...) G_GNUC_PRINTF(2, 3);
/* 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);
void virtio_del_queue(VirtIODevice *vdev, int n);
void virtio_delete_queue(VirtQueue *vq);
void virtqueue_push(VirtQueue *vq, const VirtQueueElement *elem,
unsigned int len);
void virtqueue_flush(VirtQueue *vq, unsigned int count);
void virtqueue_detach_element(VirtQueue *vq, const VirtQueueElement *elem,
unsigned int len);
void virtqueue_unpop(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(VirtIODevice *vdev, VirtQueueElement *elem);
void *virtqueue_pop(VirtQueue *vq, size_t sz);
unsigned int virtqueue_drop_all(VirtQueue *vq);
void *qemu_get_virtqueue_element(VirtIODevice *vdev, QEMUFile *f, size_t sz);
void qemu_put_virtqueue_element(VirtIODevice *vdev, 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);
void virtio_notify_irqfd(VirtIODevice *vdev, VirtQueue *vq);
void virtio_notify(VirtIODevice *vdev, VirtQueue *vq);
int virtio_save(VirtIODevice *vdev, QEMUFile *f);
extern const VMStateInfo virtio_vmstate_info;
#define VMSTATE_VIRTIO_DEVICE \
{ \
.name = "virtio", \
.info = &virtio_vmstate_info, \
.flags = VMS_SINGLE, \
}
int virtio_load(VirtIODevice *vdev, QEMUFile *f, int version_id);
void virtio_notify_config(VirtIODevice *vdev);
bool virtio_queue_get_notification(VirtQueue *vq);
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_queue_get_max_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_queue_set_host_notifier_mr(VirtIODevice *vdev, int n,
MemoryRegion *mr, bool assign);
int virtio_set_status(VirtIODevice *vdev, uint8_t val);
void virtio_reset(void *opaque);
void virtio_queue_reset(VirtIODevice *vdev, uint32_t queue_index);
void virtio_queue_enable(VirtIODevice *vdev, uint32_t queue_index);
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), \
DEFINE_PROP_BIT64("iommu_platform", _state, _field, \
VIRTIO_F_IOMMU_PLATFORM, false), \
DEFINE_PROP_BIT64("packed", _state, _field, \
VIRTIO_F_RING_PACKED, false), \
DEFINE_PROP_BIT64("queue_reset", _state, _field, \
VIRTIO_F_RING_RESET, true)
hwaddr virtio_queue_get_desc_addr(VirtIODevice *vdev, int n);
bool virtio_queue_enabled_legacy(VirtIODevice *vdev, int n);
bool virtio_queue_enabled(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_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);
unsigned int virtio_queue_get_last_avail_idx(VirtIODevice *vdev, int n);
void virtio_queue_set_last_avail_idx(VirtIODevice *vdev, int n,
unsigned int idx);
void virtio_queue_restore_last_avail_idx(VirtIODevice *vdev, int n);
void virtio_queue_invalidate_signalled_used(VirtIODevice *vdev, int n);
void virtio_queue_update_used_idx(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);
int virtio_device_start_ioeventfd(VirtIODevice *vdev);
int virtio_device_grab_ioeventfd(VirtIODevice *vdev);
void virtio_device_release_ioeventfd(VirtIODevice *vdev);
bool virtio_device_ioeventfd_enabled(VirtIODevice *vdev);
EventNotifier *virtio_queue_get_host_notifier(VirtQueue *vq);
void virtio_queue_set_host_notifier_enabled(VirtQueue *vq, bool enabled);
void virtio_queue_host_notifier_read(EventNotifier *n);
void virtio_queue_aio_attach_host_notifier(VirtQueue *vq, AioContext *ctx);
void virtio_queue_aio_attach_host_notifier_no_poll(VirtQueue *vq, AioContext *ctx);
void virtio_queue_aio_detach_host_notifier(VirtQueue *vq, AioContext *ctx);
VirtQueue *virtio_vector_first_queue(VirtIODevice *vdev, uint16_t vector);
VirtQueue *virtio_vector_next_queue(VirtQueue *vq);
EventNotifier *virtio_config_get_guest_notifier(VirtIODevice *vdev);
void virtio_config_set_guest_notifier_fd_handler(VirtIODevice *vdev,
bool assign, bool with_irqfd);
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;
}
/**
* virtio_device_started() - check if device started
* @vdev - the VirtIO device
* @status - the devices status bits
*
* Check if the device is started. For most modern machines this is
* tracked via the @vdev->started field (to support migration),
* otherwise we check for the final negotiated status bit that
* indicates everything is ready.
*/
static inline bool virtio_device_started(VirtIODevice *vdev, uint8_t status)
{
if (vdev->use_started) {
return vdev->started;
}
return status & VIRTIO_CONFIG_S_DRIVER_OK;
}
/**
* virtio_device_should_start() - check if device startable
* @vdev - the VirtIO device
* @status - the devices status bits
*
* This is similar to virtio_device_started() but also encapsulates a
* check on the VM status which would prevent a device starting
* anyway.
*/
static inline bool virtio_device_should_start(VirtIODevice *vdev, uint8_t status)
{
if (!vdev->vm_running) {
return false;
}
return virtio_device_started(vdev, status);
}
static inline void virtio_set_started(VirtIODevice *vdev, bool started)
{
if (started) {
vdev->start_on_kick = false;
}
if (vdev->use_started) {
vdev->started = started;
}
}
static inline void virtio_set_disabled(VirtIODevice *vdev, bool disable)
{
if (vdev->use_disabled_flag) {
vdev->disabled = disable;
}
}
static inline bool virtio_device_disabled(VirtIODevice *vdev)
{
return unlikely(vdev->disabled || vdev->broken);
}
bool virtio_legacy_allowed(VirtIODevice *vdev);
bool virtio_legacy_check_disabled(VirtIODevice *vdev);
#endif
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