bcbabae8ff
Add support for event_idx feature, and utilize it to reduce the number of interrupts and exits for the guest. Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
238 lines
8.7 KiB
C
238 lines
8.7 KiB
C
/*
|
|
* 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.h"
|
|
#include "net.h"
|
|
#include "qdev.h"
|
|
#include "sysemu.h"
|
|
#include "block_int.h"
|
|
#include "event_notifier.h"
|
|
#ifdef CONFIG_LINUX
|
|
#include "9p.h"
|
|
#endif
|
|
|
|
/* from Linux's linux/virtio_config.h */
|
|
|
|
/* Status byte for guest to report progress, and synchronize features. */
|
|
/* We have seen device and processed generic fields (VIRTIO_CONFIG_F_VIRTIO) */
|
|
#define VIRTIO_CONFIG_S_ACKNOWLEDGE 1
|
|
/* We have found a driver for the device. */
|
|
#define VIRTIO_CONFIG_S_DRIVER 2
|
|
/* Driver has used its parts of the config, and is happy */
|
|
#define VIRTIO_CONFIG_S_DRIVER_OK 4
|
|
/* We've given up on this device. */
|
|
#define VIRTIO_CONFIG_S_FAILED 0x80
|
|
|
|
/* Some virtio feature bits (currently bits 28 through 31) are reserved for the
|
|
* transport being used (eg. virtio_ring), the rest are per-device feature bits. */
|
|
#define VIRTIO_TRANSPORT_F_START 28
|
|
#define VIRTIO_TRANSPORT_F_END 32
|
|
|
|
/* We notify when the ring is completely used, even if the guest is suppressing
|
|
* callbacks */
|
|
#define VIRTIO_F_NOTIFY_ON_EMPTY 24
|
|
/* We support indirect buffer descriptors */
|
|
#define VIRTIO_RING_F_INDIRECT_DESC 28
|
|
/* The Guest publishes the used index for which it expects an interrupt
|
|
* at the end of the avail ring. Host should ignore the avail->flags field. */
|
|
/* The Host publishes the avail index for which it expects a kick
|
|
* at the end of the used ring. Guest should ignore the used->flags field. */
|
|
#define VIRTIO_RING_F_EVENT_IDX 29
|
|
/* A guest should never accept this. It implies negotiation is broken. */
|
|
#define VIRTIO_F_BAD_FEATURE 30
|
|
|
|
/* from Linux's linux/virtio_ring.h */
|
|
|
|
/* This marks a buffer as continuing via the next field. */
|
|
#define VRING_DESC_F_NEXT 1
|
|
/* This marks a buffer as write-only (otherwise read-only). */
|
|
#define VRING_DESC_F_WRITE 2
|
|
/* This means the buffer contains a list of buffer descriptors. */
|
|
#define VRING_DESC_F_INDIRECT 4
|
|
|
|
/* This means don't notify other side when buffer added. */
|
|
#define VRING_USED_F_NO_NOTIFY 1
|
|
/* This means don't interrupt guest when buffer consumed. */
|
|
#define VRING_AVAIL_F_NO_INTERRUPT 1
|
|
|
|
struct VirtQueue;
|
|
|
|
static inline target_phys_addr_t vring_align(target_phys_addr_t 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;
|
|
target_phys_addr_t in_addr[VIRTQUEUE_MAX_SIZE];
|
|
target_phys_addr_t out_addr[VIRTQUEUE_MAX_SIZE];
|
|
struct iovec in_sg[VIRTQUEUE_MAX_SIZE];
|
|
struct iovec out_sg[VIRTQUEUE_MAX_SIZE];
|
|
} VirtQueueElement;
|
|
|
|
typedef struct {
|
|
void (*notify)(void * opaque, uint16_t vector);
|
|
void (*save_config)(void * opaque, QEMUFile *f);
|
|
void (*save_queue)(void * opaque, int n, QEMUFile *f);
|
|
int (*load_config)(void * opaque, QEMUFile *f);
|
|
int (*load_queue)(void * opaque, int n, QEMUFile *f);
|
|
int (*load_done)(void * opaque, QEMUFile *f);
|
|
unsigned (*get_features)(void * opaque);
|
|
bool (*query_guest_notifiers)(void * opaque);
|
|
int (*set_guest_notifiers)(void * opaque, bool assigned);
|
|
int (*set_host_notifier)(void * opaque, int n, bool assigned);
|
|
void (*vmstate_change)(void * opaque, bool running);
|
|
} VirtIOBindings;
|
|
|
|
#define VIRTIO_PCI_QUEUE_MAX 64
|
|
|
|
#define VIRTIO_NO_VECTOR 0xffff
|
|
|
|
struct VirtIODevice
|
|
{
|
|
const char *name;
|
|
uint8_t status;
|
|
uint8_t isr;
|
|
uint16_t queue_sel;
|
|
uint32_t guest_features;
|
|
size_t config_len;
|
|
void *config;
|
|
uint16_t config_vector;
|
|
int nvectors;
|
|
uint32_t (*get_features)(VirtIODevice *vdev, uint32_t requested_features);
|
|
uint32_t (*bad_features)(VirtIODevice *vdev);
|
|
void (*set_features)(VirtIODevice *vdev, uint32_t val);
|
|
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);
|
|
VirtQueue *vq;
|
|
const VirtIOBindings *binding;
|
|
void *binding_opaque;
|
|
uint16_t device_id;
|
|
bool vm_running;
|
|
VMChangeStateEntry *vmstate;
|
|
};
|
|
|
|
static inline void virtio_set_status(VirtIODevice *vdev, uint8_t val)
|
|
{
|
|
if (vdev->set_status) {
|
|
vdev->set_status(vdev, val);
|
|
}
|
|
vdev->status = val;
|
|
}
|
|
|
|
VirtQueue *virtio_add_queue(VirtIODevice *vdev, int queue_size,
|
|
void (*handle_output)(VirtIODevice *,
|
|
VirtQueue *));
|
|
|
|
void virtqueue_push(VirtQueue *vq, const VirtQueueElement *elem,
|
|
unsigned int len);
|
|
void virtqueue_flush(VirtQueue *vq, unsigned int count);
|
|
void virtqueue_fill(VirtQueue *vq, const VirtQueueElement *elem,
|
|
unsigned int len, unsigned int idx);
|
|
|
|
void virtqueue_map_sg(struct iovec *sg, target_phys_addr_t *addr,
|
|
size_t num_sg, int is_write);
|
|
int virtqueue_pop(VirtQueue *vq, VirtQueueElement *elem);
|
|
int virtqueue_avail_bytes(VirtQueue *vq, int in_bytes, int out_bytes);
|
|
|
|
void virtio_notify(VirtIODevice *vdev, VirtQueue *vq);
|
|
|
|
void virtio_save(VirtIODevice *vdev, QEMUFile *f);
|
|
|
|
int virtio_load(VirtIODevice *vdev, QEMUFile *f);
|
|
|
|
void virtio_cleanup(VirtIODevice *vdev);
|
|
|
|
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. */
|
|
|
|
VirtIODevice *virtio_common_init(const char *name, uint16_t device_id,
|
|
size_t config_size, size_t struct_size);
|
|
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);
|
|
void virtio_queue_set_addr(VirtIODevice *vdev, int n, target_phys_addr_t addr);
|
|
target_phys_addr_t virtio_queue_get_addr(VirtIODevice *vdev, int n);
|
|
int virtio_queue_get_num(VirtIODevice *vdev, int n);
|
|
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);
|
|
void virtio_reset(void *opaque);
|
|
void virtio_update_irq(VirtIODevice *vdev);
|
|
|
|
void virtio_bind_device(VirtIODevice *vdev, const VirtIOBindings *binding,
|
|
void *opaque);
|
|
|
|
/* Base devices. */
|
|
VirtIODevice *virtio_blk_init(DeviceState *dev, BlockConf *conf);
|
|
struct virtio_net_conf;
|
|
VirtIODevice *virtio_net_init(DeviceState *dev, NICConf *conf,
|
|
struct virtio_net_conf *net);
|
|
typedef struct virtio_serial_conf virtio_serial_conf;
|
|
VirtIODevice *virtio_serial_init(DeviceState *dev, virtio_serial_conf *serial);
|
|
VirtIODevice *virtio_balloon_init(DeviceState *dev);
|
|
#ifdef CONFIG_LINUX
|
|
VirtIODevice *virtio_9p_init(DeviceState *dev, V9fsConf *conf);
|
|
#endif
|
|
|
|
|
|
void virtio_net_exit(VirtIODevice *vdev);
|
|
void virtio_blk_exit(VirtIODevice *vdev);
|
|
void virtio_serial_exit(VirtIODevice *vdev);
|
|
|
|
#define DEFINE_VIRTIO_COMMON_FEATURES(_state, _field) \
|
|
DEFINE_PROP_BIT("indirect_desc", _state, _field, \
|
|
VIRTIO_RING_F_INDIRECT_DESC, true), \
|
|
DEFINE_PROP_BIT("event_idx", _state, _field, \
|
|
VIRTIO_RING_F_EVENT_IDX, true)
|
|
|
|
target_phys_addr_t virtio_queue_get_desc_addr(VirtIODevice *vdev, int n);
|
|
target_phys_addr_t virtio_queue_get_avail_addr(VirtIODevice *vdev, int n);
|
|
target_phys_addr_t virtio_queue_get_used_addr(VirtIODevice *vdev, int n);
|
|
target_phys_addr_t virtio_queue_get_ring_addr(VirtIODevice *vdev, int n);
|
|
target_phys_addr_t virtio_queue_get_desc_size(VirtIODevice *vdev, int n);
|
|
target_phys_addr_t virtio_queue_get_avail_size(VirtIODevice *vdev, int n);
|
|
target_phys_addr_t virtio_queue_get_used_size(VirtIODevice *vdev, int n);
|
|
target_phys_addr_t 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);
|
|
VirtQueue *virtio_get_queue(VirtIODevice *vdev, int n);
|
|
EventNotifier *virtio_queue_get_guest_notifier(VirtQueue *vq);
|
|
EventNotifier *virtio_queue_get_host_notifier(VirtQueue *vq);
|
|
void virtio_queue_notify_vq(VirtQueue *vq);
|
|
void virtio_irq(VirtQueue *vq);
|
|
#endif
|