Add a helper function for checking whether a bit is set in the guest features for a vdev as well as one that works on a feature bit set. Convert code that open-coded this: It cleans up the code and makes it easier to extend the guest feature bits. Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com> Reviewed-by: Michael S. Tsirkin <mst@redhat.com> Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
1346 lines
36 KiB
C
1346 lines
36 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.
|
|
*
|
|
*/
|
|
|
|
#include <inttypes.h>
|
|
|
|
#include "trace.h"
|
|
#include "exec/address-spaces.h"
|
|
#include "qemu/error-report.h"
|
|
#include "hw/virtio/virtio.h"
|
|
#include "qemu/atomic.h"
|
|
#include "hw/virtio/virtio-bus.h"
|
|
#include "migration/migration.h"
|
|
#include "hw/virtio/virtio-access.h"
|
|
|
|
/*
|
|
* The alignment to use between consumer and producer parts of vring.
|
|
* x86 pagesize again. This is the default, used by transports like PCI
|
|
* which don't provide a means for the guest to tell the host the alignment.
|
|
*/
|
|
#define VIRTIO_PCI_VRING_ALIGN 4096
|
|
|
|
typedef struct VRingDesc
|
|
{
|
|
uint64_t addr;
|
|
uint32_t len;
|
|
uint16_t flags;
|
|
uint16_t next;
|
|
} VRingDesc;
|
|
|
|
typedef struct VRingAvail
|
|
{
|
|
uint16_t flags;
|
|
uint16_t idx;
|
|
uint16_t ring[0];
|
|
} VRingAvail;
|
|
|
|
typedef struct VRingUsedElem
|
|
{
|
|
uint32_t id;
|
|
uint32_t len;
|
|
} VRingUsedElem;
|
|
|
|
typedef struct VRingUsed
|
|
{
|
|
uint16_t flags;
|
|
uint16_t idx;
|
|
VRingUsedElem ring[0];
|
|
} VRingUsed;
|
|
|
|
typedef struct VRing
|
|
{
|
|
unsigned int num;
|
|
unsigned int align;
|
|
hwaddr desc;
|
|
hwaddr avail;
|
|
hwaddr used;
|
|
} VRing;
|
|
|
|
struct VirtQueue
|
|
{
|
|
VRing vring;
|
|
hwaddr pa;
|
|
uint16_t last_avail_idx;
|
|
/* Last used index value we have signalled on */
|
|
uint16_t signalled_used;
|
|
|
|
/* Last used index value we have signalled on */
|
|
bool signalled_used_valid;
|
|
|
|
/* Notification enabled? */
|
|
bool notification;
|
|
|
|
uint16_t queue_index;
|
|
|
|
int inuse;
|
|
|
|
uint16_t vector;
|
|
void (*handle_output)(VirtIODevice *vdev, VirtQueue *vq);
|
|
VirtIODevice *vdev;
|
|
EventNotifier guest_notifier;
|
|
EventNotifier host_notifier;
|
|
};
|
|
|
|
/* virt queue functions */
|
|
static void virtqueue_init(VirtQueue *vq)
|
|
{
|
|
hwaddr pa = vq->pa;
|
|
|
|
vq->vring.desc = pa;
|
|
vq->vring.avail = pa + vq->vring.num * sizeof(VRingDesc);
|
|
vq->vring.used = vring_align(vq->vring.avail +
|
|
offsetof(VRingAvail, ring[vq->vring.num]),
|
|
vq->vring.align);
|
|
}
|
|
|
|
static inline uint64_t vring_desc_addr(VirtIODevice *vdev, hwaddr desc_pa,
|
|
int i)
|
|
{
|
|
hwaddr pa;
|
|
pa = desc_pa + sizeof(VRingDesc) * i + offsetof(VRingDesc, addr);
|
|
return virtio_ldq_phys(vdev, pa);
|
|
}
|
|
|
|
static inline uint32_t vring_desc_len(VirtIODevice *vdev, hwaddr desc_pa, int i)
|
|
{
|
|
hwaddr pa;
|
|
pa = desc_pa + sizeof(VRingDesc) * i + offsetof(VRingDesc, len);
|
|
return virtio_ldl_phys(vdev, pa);
|
|
}
|
|
|
|
static inline uint16_t vring_desc_flags(VirtIODevice *vdev, hwaddr desc_pa,
|
|
int i)
|
|
{
|
|
hwaddr pa;
|
|
pa = desc_pa + sizeof(VRingDesc) * i + offsetof(VRingDesc, flags);
|
|
return virtio_lduw_phys(vdev, pa);
|
|
}
|
|
|
|
static inline uint16_t vring_desc_next(VirtIODevice *vdev, hwaddr desc_pa,
|
|
int i)
|
|
{
|
|
hwaddr pa;
|
|
pa = desc_pa + sizeof(VRingDesc) * i + offsetof(VRingDesc, next);
|
|
return virtio_lduw_phys(vdev, pa);
|
|
}
|
|
|
|
static inline uint16_t vring_avail_flags(VirtQueue *vq)
|
|
{
|
|
hwaddr pa;
|
|
pa = vq->vring.avail + offsetof(VRingAvail, flags);
|
|
return virtio_lduw_phys(vq->vdev, pa);
|
|
}
|
|
|
|
static inline uint16_t vring_avail_idx(VirtQueue *vq)
|
|
{
|
|
hwaddr pa;
|
|
pa = vq->vring.avail + offsetof(VRingAvail, idx);
|
|
return virtio_lduw_phys(vq->vdev, pa);
|
|
}
|
|
|
|
static inline uint16_t vring_avail_ring(VirtQueue *vq, int i)
|
|
{
|
|
hwaddr pa;
|
|
pa = vq->vring.avail + offsetof(VRingAvail, ring[i]);
|
|
return virtio_lduw_phys(vq->vdev, pa);
|
|
}
|
|
|
|
static inline uint16_t vring_get_used_event(VirtQueue *vq)
|
|
{
|
|
return vring_avail_ring(vq, vq->vring.num);
|
|
}
|
|
|
|
static inline void vring_used_ring_id(VirtQueue *vq, int i, uint32_t val)
|
|
{
|
|
hwaddr pa;
|
|
pa = vq->vring.used + offsetof(VRingUsed, ring[i].id);
|
|
virtio_stl_phys(vq->vdev, pa, val);
|
|
}
|
|
|
|
static inline void vring_used_ring_len(VirtQueue *vq, int i, uint32_t val)
|
|
{
|
|
hwaddr pa;
|
|
pa = vq->vring.used + offsetof(VRingUsed, ring[i].len);
|
|
virtio_stl_phys(vq->vdev, pa, val);
|
|
}
|
|
|
|
static uint16_t vring_used_idx(VirtQueue *vq)
|
|
{
|
|
hwaddr pa;
|
|
pa = vq->vring.used + offsetof(VRingUsed, idx);
|
|
return virtio_lduw_phys(vq->vdev, pa);
|
|
}
|
|
|
|
static inline void vring_used_idx_set(VirtQueue *vq, uint16_t val)
|
|
{
|
|
hwaddr pa;
|
|
pa = vq->vring.used + offsetof(VRingUsed, idx);
|
|
virtio_stw_phys(vq->vdev, pa, val);
|
|
}
|
|
|
|
static inline void vring_used_flags_set_bit(VirtQueue *vq, int mask)
|
|
{
|
|
VirtIODevice *vdev = vq->vdev;
|
|
hwaddr pa;
|
|
pa = vq->vring.used + offsetof(VRingUsed, flags);
|
|
virtio_stw_phys(vdev, pa, virtio_lduw_phys(vdev, pa) | mask);
|
|
}
|
|
|
|
static inline void vring_used_flags_unset_bit(VirtQueue *vq, int mask)
|
|
{
|
|
VirtIODevice *vdev = vq->vdev;
|
|
hwaddr pa;
|
|
pa = vq->vring.used + offsetof(VRingUsed, flags);
|
|
virtio_stw_phys(vdev, pa, virtio_lduw_phys(vdev, pa) & ~mask);
|
|
}
|
|
|
|
static inline void vring_set_avail_event(VirtQueue *vq, uint16_t val)
|
|
{
|
|
hwaddr pa;
|
|
if (!vq->notification) {
|
|
return;
|
|
}
|
|
pa = vq->vring.used + offsetof(VRingUsed, ring[vq->vring.num]);
|
|
virtio_stw_phys(vq->vdev, pa, val);
|
|
}
|
|
|
|
void virtio_queue_set_notification(VirtQueue *vq, int enable)
|
|
{
|
|
vq->notification = enable;
|
|
if (virtio_has_feature(vq->vdev, VIRTIO_RING_F_EVENT_IDX)) {
|
|
vring_set_avail_event(vq, vring_avail_idx(vq));
|
|
} else if (enable) {
|
|
vring_used_flags_unset_bit(vq, VRING_USED_F_NO_NOTIFY);
|
|
} else {
|
|
vring_used_flags_set_bit(vq, VRING_USED_F_NO_NOTIFY);
|
|
}
|
|
if (enable) {
|
|
/* Expose avail event/used flags before caller checks the avail idx. */
|
|
smp_mb();
|
|
}
|
|
}
|
|
|
|
int virtio_queue_ready(VirtQueue *vq)
|
|
{
|
|
return vq->vring.avail != 0;
|
|
}
|
|
|
|
int virtio_queue_empty(VirtQueue *vq)
|
|
{
|
|
return vring_avail_idx(vq) == vq->last_avail_idx;
|
|
}
|
|
|
|
void virtqueue_fill(VirtQueue *vq, const VirtQueueElement *elem,
|
|
unsigned int len, unsigned int idx)
|
|
{
|
|
unsigned int offset;
|
|
int i;
|
|
|
|
trace_virtqueue_fill(vq, elem, len, idx);
|
|
|
|
offset = 0;
|
|
for (i = 0; i < elem->in_num; i++) {
|
|
size_t size = MIN(len - offset, elem->in_sg[i].iov_len);
|
|
|
|
cpu_physical_memory_unmap(elem->in_sg[i].iov_base,
|
|
elem->in_sg[i].iov_len,
|
|
1, size);
|
|
|
|
offset += size;
|
|
}
|
|
|
|
for (i = 0; i < elem->out_num; i++)
|
|
cpu_physical_memory_unmap(elem->out_sg[i].iov_base,
|
|
elem->out_sg[i].iov_len,
|
|
0, elem->out_sg[i].iov_len);
|
|
|
|
idx = (idx + vring_used_idx(vq)) % vq->vring.num;
|
|
|
|
/* Get a pointer to the next entry in the used ring. */
|
|
vring_used_ring_id(vq, idx, elem->index);
|
|
vring_used_ring_len(vq, idx, len);
|
|
}
|
|
|
|
void virtqueue_flush(VirtQueue *vq, unsigned int count)
|
|
{
|
|
uint16_t old, new;
|
|
/* Make sure buffer is written before we update index. */
|
|
smp_wmb();
|
|
trace_virtqueue_flush(vq, count);
|
|
old = vring_used_idx(vq);
|
|
new = old + count;
|
|
vring_used_idx_set(vq, new);
|
|
vq->inuse -= count;
|
|
if (unlikely((int16_t)(new - vq->signalled_used) < (uint16_t)(new - old)))
|
|
vq->signalled_used_valid = false;
|
|
}
|
|
|
|
void virtqueue_push(VirtQueue *vq, const VirtQueueElement *elem,
|
|
unsigned int len)
|
|
{
|
|
virtqueue_fill(vq, elem, len, 0);
|
|
virtqueue_flush(vq, 1);
|
|
}
|
|
|
|
static int virtqueue_num_heads(VirtQueue *vq, unsigned int idx)
|
|
{
|
|
uint16_t num_heads = vring_avail_idx(vq) - idx;
|
|
|
|
/* Check it isn't doing very strange things with descriptor numbers. */
|
|
if (num_heads > vq->vring.num) {
|
|
error_report("Guest moved used index from %u to %u",
|
|
idx, vring_avail_idx(vq));
|
|
exit(1);
|
|
}
|
|
/* On success, callers read a descriptor at vq->last_avail_idx.
|
|
* Make sure descriptor read does not bypass avail index read. */
|
|
if (num_heads) {
|
|
smp_rmb();
|
|
}
|
|
|
|
return num_heads;
|
|
}
|
|
|
|
static unsigned int virtqueue_get_head(VirtQueue *vq, unsigned int idx)
|
|
{
|
|
unsigned int head;
|
|
|
|
/* Grab the next descriptor number they're advertising, and increment
|
|
* the index we've seen. */
|
|
head = vring_avail_ring(vq, idx % vq->vring.num);
|
|
|
|
/* If their number is silly, that's a fatal mistake. */
|
|
if (head >= vq->vring.num) {
|
|
error_report("Guest says index %u is available", head);
|
|
exit(1);
|
|
}
|
|
|
|
return head;
|
|
}
|
|
|
|
static unsigned virtqueue_next_desc(VirtIODevice *vdev, hwaddr desc_pa,
|
|
unsigned int i, unsigned int max)
|
|
{
|
|
unsigned int next;
|
|
|
|
/* If this descriptor says it doesn't chain, we're done. */
|
|
if (!(vring_desc_flags(vdev, desc_pa, i) & VRING_DESC_F_NEXT)) {
|
|
return max;
|
|
}
|
|
|
|
/* Check they're not leading us off end of descriptors. */
|
|
next = vring_desc_next(vdev, desc_pa, i);
|
|
/* Make sure compiler knows to grab that: we don't want it changing! */
|
|
smp_wmb();
|
|
|
|
if (next >= max) {
|
|
error_report("Desc next is %u", next);
|
|
exit(1);
|
|
}
|
|
|
|
return next;
|
|
}
|
|
|
|
void virtqueue_get_avail_bytes(VirtQueue *vq, unsigned int *in_bytes,
|
|
unsigned int *out_bytes,
|
|
unsigned max_in_bytes, unsigned max_out_bytes)
|
|
{
|
|
unsigned int idx;
|
|
unsigned int total_bufs, in_total, out_total;
|
|
|
|
idx = vq->last_avail_idx;
|
|
|
|
total_bufs = in_total = out_total = 0;
|
|
while (virtqueue_num_heads(vq, idx)) {
|
|
VirtIODevice *vdev = vq->vdev;
|
|
unsigned int max, num_bufs, indirect = 0;
|
|
hwaddr desc_pa;
|
|
int i;
|
|
|
|
max = vq->vring.num;
|
|
num_bufs = total_bufs;
|
|
i = virtqueue_get_head(vq, idx++);
|
|
desc_pa = vq->vring.desc;
|
|
|
|
if (vring_desc_flags(vdev, desc_pa, i) & VRING_DESC_F_INDIRECT) {
|
|
if (vring_desc_len(vdev, desc_pa, i) % sizeof(VRingDesc)) {
|
|
error_report("Invalid size for indirect buffer table");
|
|
exit(1);
|
|
}
|
|
|
|
/* If we've got too many, that implies a descriptor loop. */
|
|
if (num_bufs >= max) {
|
|
error_report("Looped descriptor");
|
|
exit(1);
|
|
}
|
|
|
|
/* loop over the indirect descriptor table */
|
|
indirect = 1;
|
|
max = vring_desc_len(vdev, desc_pa, i) / sizeof(VRingDesc);
|
|
desc_pa = vring_desc_addr(vdev, desc_pa, i);
|
|
num_bufs = i = 0;
|
|
}
|
|
|
|
do {
|
|
/* If we've got too many, that implies a descriptor loop. */
|
|
if (++num_bufs > max) {
|
|
error_report("Looped descriptor");
|
|
exit(1);
|
|
}
|
|
|
|
if (vring_desc_flags(vdev, desc_pa, i) & VRING_DESC_F_WRITE) {
|
|
in_total += vring_desc_len(vdev, desc_pa, i);
|
|
} else {
|
|
out_total += vring_desc_len(vdev, desc_pa, i);
|
|
}
|
|
if (in_total >= max_in_bytes && out_total >= max_out_bytes) {
|
|
goto done;
|
|
}
|
|
} while ((i = virtqueue_next_desc(vdev, desc_pa, i, max)) != max);
|
|
|
|
if (!indirect)
|
|
total_bufs = num_bufs;
|
|
else
|
|
total_bufs++;
|
|
}
|
|
done:
|
|
if (in_bytes) {
|
|
*in_bytes = in_total;
|
|
}
|
|
if (out_bytes) {
|
|
*out_bytes = out_total;
|
|
}
|
|
}
|
|
|
|
int virtqueue_avail_bytes(VirtQueue *vq, unsigned int in_bytes,
|
|
unsigned int out_bytes)
|
|
{
|
|
unsigned int in_total, out_total;
|
|
|
|
virtqueue_get_avail_bytes(vq, &in_total, &out_total, in_bytes, out_bytes);
|
|
return in_bytes <= in_total && out_bytes <= out_total;
|
|
}
|
|
|
|
void virtqueue_map_sg(struct iovec *sg, hwaddr *addr,
|
|
size_t num_sg, int is_write)
|
|
{
|
|
unsigned int i;
|
|
hwaddr len;
|
|
|
|
if (num_sg > VIRTQUEUE_MAX_SIZE) {
|
|
error_report("virtio: map attempt out of bounds: %zd > %d",
|
|
num_sg, VIRTQUEUE_MAX_SIZE);
|
|
exit(1);
|
|
}
|
|
|
|
for (i = 0; i < num_sg; i++) {
|
|
len = sg[i].iov_len;
|
|
sg[i].iov_base = cpu_physical_memory_map(addr[i], &len, is_write);
|
|
if (sg[i].iov_base == NULL || len != sg[i].iov_len) {
|
|
error_report("virtio: error trying to map MMIO memory");
|
|
exit(1);
|
|
}
|
|
}
|
|
}
|
|
|
|
int virtqueue_pop(VirtQueue *vq, VirtQueueElement *elem)
|
|
{
|
|
unsigned int i, head, max;
|
|
hwaddr desc_pa = vq->vring.desc;
|
|
VirtIODevice *vdev = vq->vdev;
|
|
|
|
if (!virtqueue_num_heads(vq, vq->last_avail_idx))
|
|
return 0;
|
|
|
|
/* When we start there are none of either input nor output. */
|
|
elem->out_num = elem->in_num = 0;
|
|
|
|
max = vq->vring.num;
|
|
|
|
i = head = virtqueue_get_head(vq, vq->last_avail_idx++);
|
|
if (virtio_has_feature(vdev, VIRTIO_RING_F_EVENT_IDX)) {
|
|
vring_set_avail_event(vq, vq->last_avail_idx);
|
|
}
|
|
|
|
if (vring_desc_flags(vdev, desc_pa, i) & VRING_DESC_F_INDIRECT) {
|
|
if (vring_desc_len(vdev, desc_pa, i) % sizeof(VRingDesc)) {
|
|
error_report("Invalid size for indirect buffer table");
|
|
exit(1);
|
|
}
|
|
|
|
/* loop over the indirect descriptor table */
|
|
max = vring_desc_len(vdev, desc_pa, i) / sizeof(VRingDesc);
|
|
desc_pa = vring_desc_addr(vdev, desc_pa, i);
|
|
i = 0;
|
|
}
|
|
|
|
/* Collect all the descriptors */
|
|
do {
|
|
struct iovec *sg;
|
|
|
|
if (vring_desc_flags(vdev, desc_pa, i) & VRING_DESC_F_WRITE) {
|
|
if (elem->in_num >= ARRAY_SIZE(elem->in_sg)) {
|
|
error_report("Too many write descriptors in indirect table");
|
|
exit(1);
|
|
}
|
|
elem->in_addr[elem->in_num] = vring_desc_addr(vdev, desc_pa, i);
|
|
sg = &elem->in_sg[elem->in_num++];
|
|
} else {
|
|
if (elem->out_num >= ARRAY_SIZE(elem->out_sg)) {
|
|
error_report("Too many read descriptors in indirect table");
|
|
exit(1);
|
|
}
|
|
elem->out_addr[elem->out_num] = vring_desc_addr(vdev, desc_pa, i);
|
|
sg = &elem->out_sg[elem->out_num++];
|
|
}
|
|
|
|
sg->iov_len = vring_desc_len(vdev, desc_pa, i);
|
|
|
|
/* If we've got too many, that implies a descriptor loop. */
|
|
if ((elem->in_num + elem->out_num) > max) {
|
|
error_report("Looped descriptor");
|
|
exit(1);
|
|
}
|
|
} while ((i = virtqueue_next_desc(vdev, desc_pa, i, max)) != max);
|
|
|
|
/* Now map what we have collected */
|
|
virtqueue_map_sg(elem->in_sg, elem->in_addr, elem->in_num, 1);
|
|
virtqueue_map_sg(elem->out_sg, elem->out_addr, elem->out_num, 0);
|
|
|
|
elem->index = head;
|
|
|
|
vq->inuse++;
|
|
|
|
trace_virtqueue_pop(vq, elem, elem->in_num, elem->out_num);
|
|
return elem->in_num + elem->out_num;
|
|
}
|
|
|
|
/* virtio device */
|
|
static void virtio_notify_vector(VirtIODevice *vdev, uint16_t vector)
|
|
{
|
|
BusState *qbus = qdev_get_parent_bus(DEVICE(vdev));
|
|
VirtioBusClass *k = VIRTIO_BUS_GET_CLASS(qbus);
|
|
|
|
if (k->notify) {
|
|
k->notify(qbus->parent, vector);
|
|
}
|
|
}
|
|
|
|
void virtio_update_irq(VirtIODevice *vdev)
|
|
{
|
|
virtio_notify_vector(vdev, VIRTIO_NO_VECTOR);
|
|
}
|
|
|
|
void virtio_set_status(VirtIODevice *vdev, uint8_t val)
|
|
{
|
|
VirtioDeviceClass *k = VIRTIO_DEVICE_GET_CLASS(vdev);
|
|
trace_virtio_set_status(vdev, val);
|
|
|
|
if (k->set_status) {
|
|
k->set_status(vdev, val);
|
|
}
|
|
vdev->status = val;
|
|
}
|
|
|
|
bool target_words_bigendian(void);
|
|
static enum virtio_device_endian virtio_default_endian(void)
|
|
{
|
|
if (target_words_bigendian()) {
|
|
return VIRTIO_DEVICE_ENDIAN_BIG;
|
|
} else {
|
|
return VIRTIO_DEVICE_ENDIAN_LITTLE;
|
|
}
|
|
}
|
|
|
|
static enum virtio_device_endian virtio_current_cpu_endian(void)
|
|
{
|
|
CPUClass *cc = CPU_GET_CLASS(current_cpu);
|
|
|
|
if (cc->virtio_is_big_endian(current_cpu)) {
|
|
return VIRTIO_DEVICE_ENDIAN_BIG;
|
|
} else {
|
|
return VIRTIO_DEVICE_ENDIAN_LITTLE;
|
|
}
|
|
}
|
|
|
|
void virtio_reset(void *opaque)
|
|
{
|
|
VirtIODevice *vdev = opaque;
|
|
VirtioDeviceClass *k = VIRTIO_DEVICE_GET_CLASS(vdev);
|
|
int i;
|
|
|
|
virtio_set_status(vdev, 0);
|
|
if (current_cpu) {
|
|
/* Guest initiated reset */
|
|
vdev->device_endian = virtio_current_cpu_endian();
|
|
} else {
|
|
/* System reset */
|
|
vdev->device_endian = virtio_default_endian();
|
|
}
|
|
|
|
if (k->reset) {
|
|
k->reset(vdev);
|
|
}
|
|
|
|
vdev->guest_features = 0;
|
|
vdev->queue_sel = 0;
|
|
vdev->status = 0;
|
|
vdev->isr = 0;
|
|
vdev->config_vector = VIRTIO_NO_VECTOR;
|
|
virtio_notify_vector(vdev, vdev->config_vector);
|
|
|
|
for(i = 0; i < VIRTIO_PCI_QUEUE_MAX; i++) {
|
|
vdev->vq[i].vring.desc = 0;
|
|
vdev->vq[i].vring.avail = 0;
|
|
vdev->vq[i].vring.used = 0;
|
|
vdev->vq[i].last_avail_idx = 0;
|
|
vdev->vq[i].pa = 0;
|
|
vdev->vq[i].vector = VIRTIO_NO_VECTOR;
|
|
vdev->vq[i].signalled_used = 0;
|
|
vdev->vq[i].signalled_used_valid = false;
|
|
vdev->vq[i].notification = true;
|
|
}
|
|
}
|
|
|
|
uint32_t virtio_config_readb(VirtIODevice *vdev, uint32_t addr)
|
|
{
|
|
VirtioDeviceClass *k = VIRTIO_DEVICE_GET_CLASS(vdev);
|
|
uint8_t val;
|
|
|
|
if (addr + sizeof(val) > vdev->config_len) {
|
|
return (uint32_t)-1;
|
|
}
|
|
|
|
k->get_config(vdev, vdev->config);
|
|
|
|
val = ldub_p(vdev->config + addr);
|
|
return val;
|
|
}
|
|
|
|
uint32_t virtio_config_readw(VirtIODevice *vdev, uint32_t addr)
|
|
{
|
|
VirtioDeviceClass *k = VIRTIO_DEVICE_GET_CLASS(vdev);
|
|
uint16_t val;
|
|
|
|
if (addr + sizeof(val) > vdev->config_len) {
|
|
return (uint32_t)-1;
|
|
}
|
|
|
|
k->get_config(vdev, vdev->config);
|
|
|
|
val = lduw_p(vdev->config + addr);
|
|
return val;
|
|
}
|
|
|
|
uint32_t virtio_config_readl(VirtIODevice *vdev, uint32_t addr)
|
|
{
|
|
VirtioDeviceClass *k = VIRTIO_DEVICE_GET_CLASS(vdev);
|
|
uint32_t val;
|
|
|
|
if (addr + sizeof(val) > vdev->config_len) {
|
|
return (uint32_t)-1;
|
|
}
|
|
|
|
k->get_config(vdev, vdev->config);
|
|
|
|
val = ldl_p(vdev->config + addr);
|
|
return val;
|
|
}
|
|
|
|
void virtio_config_writeb(VirtIODevice *vdev, uint32_t addr, uint32_t data)
|
|
{
|
|
VirtioDeviceClass *k = VIRTIO_DEVICE_GET_CLASS(vdev);
|
|
uint8_t val = data;
|
|
|
|
if (addr + sizeof(val) > vdev->config_len) {
|
|
return;
|
|
}
|
|
|
|
stb_p(vdev->config + addr, val);
|
|
|
|
if (k->set_config) {
|
|
k->set_config(vdev, vdev->config);
|
|
}
|
|
}
|
|
|
|
void virtio_config_writew(VirtIODevice *vdev, uint32_t addr, uint32_t data)
|
|
{
|
|
VirtioDeviceClass *k = VIRTIO_DEVICE_GET_CLASS(vdev);
|
|
uint16_t val = data;
|
|
|
|
if (addr + sizeof(val) > vdev->config_len) {
|
|
return;
|
|
}
|
|
|
|
stw_p(vdev->config + addr, val);
|
|
|
|
if (k->set_config) {
|
|
k->set_config(vdev, vdev->config);
|
|
}
|
|
}
|
|
|
|
void virtio_config_writel(VirtIODevice *vdev, uint32_t addr, uint32_t data)
|
|
{
|
|
VirtioDeviceClass *k = VIRTIO_DEVICE_GET_CLASS(vdev);
|
|
uint32_t val = data;
|
|
|
|
if (addr + sizeof(val) > vdev->config_len) {
|
|
return;
|
|
}
|
|
|
|
stl_p(vdev->config + addr, val);
|
|
|
|
if (k->set_config) {
|
|
k->set_config(vdev, vdev->config);
|
|
}
|
|
}
|
|
|
|
void virtio_queue_set_addr(VirtIODevice *vdev, int n, hwaddr addr)
|
|
{
|
|
vdev->vq[n].pa = addr;
|
|
virtqueue_init(&vdev->vq[n]);
|
|
}
|
|
|
|
hwaddr virtio_queue_get_addr(VirtIODevice *vdev, int n)
|
|
{
|
|
return vdev->vq[n].pa;
|
|
}
|
|
|
|
void virtio_queue_set_num(VirtIODevice *vdev, int n, int num)
|
|
{
|
|
/* Don't allow guest to flip queue between existent and
|
|
* nonexistent states, or to set it to an invalid size.
|
|
*/
|
|
if (!!num != !!vdev->vq[n].vring.num ||
|
|
num > VIRTQUEUE_MAX_SIZE ||
|
|
num < 0) {
|
|
return;
|
|
}
|
|
vdev->vq[n].vring.num = num;
|
|
virtqueue_init(&vdev->vq[n]);
|
|
}
|
|
|
|
int virtio_queue_get_num(VirtIODevice *vdev, int n)
|
|
{
|
|
return vdev->vq[n].vring.num;
|
|
}
|
|
|
|
int virtio_queue_get_id(VirtQueue *vq)
|
|
{
|
|
VirtIODevice *vdev = vq->vdev;
|
|
assert(vq >= &vdev->vq[0] && vq < &vdev->vq[VIRTIO_PCI_QUEUE_MAX]);
|
|
return vq - &vdev->vq[0];
|
|
}
|
|
|
|
void virtio_queue_set_align(VirtIODevice *vdev, int n, int align)
|
|
{
|
|
BusState *qbus = qdev_get_parent_bus(DEVICE(vdev));
|
|
VirtioBusClass *k = VIRTIO_BUS_GET_CLASS(qbus);
|
|
|
|
/* Check that the transport told us it was going to do this
|
|
* (so a buggy transport will immediately assert rather than
|
|
* silently failing to migrate this state)
|
|
*/
|
|
assert(k->has_variable_vring_alignment);
|
|
|
|
vdev->vq[n].vring.align = align;
|
|
virtqueue_init(&vdev->vq[n]);
|
|
}
|
|
|
|
void virtio_queue_notify_vq(VirtQueue *vq)
|
|
{
|
|
if (vq->vring.desc) {
|
|
VirtIODevice *vdev = vq->vdev;
|
|
trace_virtio_queue_notify(vdev, vq - vdev->vq, vq);
|
|
vq->handle_output(vdev, vq);
|
|
}
|
|
}
|
|
|
|
void virtio_queue_notify(VirtIODevice *vdev, int n)
|
|
{
|
|
virtio_queue_notify_vq(&vdev->vq[n]);
|
|
}
|
|
|
|
uint16_t virtio_queue_vector(VirtIODevice *vdev, int n)
|
|
{
|
|
return n < VIRTIO_PCI_QUEUE_MAX ? vdev->vq[n].vector :
|
|
VIRTIO_NO_VECTOR;
|
|
}
|
|
|
|
void virtio_queue_set_vector(VirtIODevice *vdev, int n, uint16_t vector)
|
|
{
|
|
if (n < VIRTIO_PCI_QUEUE_MAX)
|
|
vdev->vq[n].vector = vector;
|
|
}
|
|
|
|
VirtQueue *virtio_add_queue(VirtIODevice *vdev, int queue_size,
|
|
void (*handle_output)(VirtIODevice *, VirtQueue *))
|
|
{
|
|
int i;
|
|
|
|
for (i = 0; i < VIRTIO_PCI_QUEUE_MAX; i++) {
|
|
if (vdev->vq[i].vring.num == 0)
|
|
break;
|
|
}
|
|
|
|
if (i == VIRTIO_PCI_QUEUE_MAX || queue_size > VIRTQUEUE_MAX_SIZE)
|
|
abort();
|
|
|
|
vdev->vq[i].vring.num = queue_size;
|
|
vdev->vq[i].vring.align = VIRTIO_PCI_VRING_ALIGN;
|
|
vdev->vq[i].handle_output = handle_output;
|
|
|
|
return &vdev->vq[i];
|
|
}
|
|
|
|
void virtio_del_queue(VirtIODevice *vdev, int n)
|
|
{
|
|
if (n < 0 || n >= VIRTIO_PCI_QUEUE_MAX) {
|
|
abort();
|
|
}
|
|
|
|
vdev->vq[n].vring.num = 0;
|
|
}
|
|
|
|
void virtio_irq(VirtQueue *vq)
|
|
{
|
|
trace_virtio_irq(vq);
|
|
vq->vdev->isr |= 0x01;
|
|
virtio_notify_vector(vq->vdev, vq->vector);
|
|
}
|
|
|
|
static bool vring_notify(VirtIODevice *vdev, VirtQueue *vq)
|
|
{
|
|
uint16_t old, new;
|
|
bool v;
|
|
/* We need to expose used array entries before checking used event. */
|
|
smp_mb();
|
|
/* Always notify when queue is empty (when feature acknowledge) */
|
|
if (virtio_has_feature(vdev, VIRTIO_F_NOTIFY_ON_EMPTY) &&
|
|
!vq->inuse && vring_avail_idx(vq) == vq->last_avail_idx) {
|
|
return true;
|
|
}
|
|
|
|
if (!virtio_has_feature(vdev, VIRTIO_RING_F_EVENT_IDX)) {
|
|
return !(vring_avail_flags(vq) & VRING_AVAIL_F_NO_INTERRUPT);
|
|
}
|
|
|
|
v = vq->signalled_used_valid;
|
|
vq->signalled_used_valid = true;
|
|
old = vq->signalled_used;
|
|
new = vq->signalled_used = vring_used_idx(vq);
|
|
return !v || vring_need_event(vring_get_used_event(vq), new, old);
|
|
}
|
|
|
|
void virtio_notify(VirtIODevice *vdev, VirtQueue *vq)
|
|
{
|
|
if (!vring_notify(vdev, vq)) {
|
|
return;
|
|
}
|
|
|
|
trace_virtio_notify(vdev, vq);
|
|
vdev->isr |= 0x01;
|
|
virtio_notify_vector(vdev, vq->vector);
|
|
}
|
|
|
|
void virtio_notify_config(VirtIODevice *vdev)
|
|
{
|
|
if (!(vdev->status & VIRTIO_CONFIG_S_DRIVER_OK))
|
|
return;
|
|
|
|
vdev->isr |= 0x03;
|
|
virtio_notify_vector(vdev, vdev->config_vector);
|
|
}
|
|
|
|
static bool virtio_device_endian_needed(void *opaque)
|
|
{
|
|
VirtIODevice *vdev = opaque;
|
|
|
|
assert(vdev->device_endian != VIRTIO_DEVICE_ENDIAN_UNKNOWN);
|
|
return vdev->device_endian != virtio_default_endian();
|
|
}
|
|
|
|
static const VMStateDescription vmstate_virtio_device_endian = {
|
|
.name = "virtio/device_endian",
|
|
.version_id = 1,
|
|
.minimum_version_id = 1,
|
|
.fields = (VMStateField[]) {
|
|
VMSTATE_UINT8(device_endian, VirtIODevice),
|
|
VMSTATE_END_OF_LIST()
|
|
}
|
|
};
|
|
|
|
static const VMStateDescription vmstate_virtio = {
|
|
.name = "virtio",
|
|
.version_id = 1,
|
|
.minimum_version_id = 1,
|
|
.minimum_version_id_old = 1,
|
|
.fields = (VMStateField[]) {
|
|
VMSTATE_END_OF_LIST()
|
|
},
|
|
.subsections = (VMStateSubsection[]) {
|
|
{
|
|
.vmsd = &vmstate_virtio_device_endian,
|
|
.needed = &virtio_device_endian_needed
|
|
},
|
|
{ 0 }
|
|
}
|
|
};
|
|
|
|
void virtio_save(VirtIODevice *vdev, QEMUFile *f)
|
|
{
|
|
BusState *qbus = qdev_get_parent_bus(DEVICE(vdev));
|
|
VirtioBusClass *k = VIRTIO_BUS_GET_CLASS(qbus);
|
|
VirtioDeviceClass *vdc = VIRTIO_DEVICE_GET_CLASS(vdev);
|
|
int i;
|
|
|
|
if (k->save_config) {
|
|
k->save_config(qbus->parent, f);
|
|
}
|
|
|
|
qemu_put_8s(f, &vdev->status);
|
|
qemu_put_8s(f, &vdev->isr);
|
|
qemu_put_be16s(f, &vdev->queue_sel);
|
|
qemu_put_be32s(f, &vdev->guest_features);
|
|
qemu_put_be32(f, vdev->config_len);
|
|
qemu_put_buffer(f, vdev->config, vdev->config_len);
|
|
|
|
for (i = 0; i < VIRTIO_PCI_QUEUE_MAX; i++) {
|
|
if (vdev->vq[i].vring.num == 0)
|
|
break;
|
|
}
|
|
|
|
qemu_put_be32(f, i);
|
|
|
|
for (i = 0; i < VIRTIO_PCI_QUEUE_MAX; i++) {
|
|
if (vdev->vq[i].vring.num == 0)
|
|
break;
|
|
|
|
qemu_put_be32(f, vdev->vq[i].vring.num);
|
|
if (k->has_variable_vring_alignment) {
|
|
qemu_put_be32(f, vdev->vq[i].vring.align);
|
|
}
|
|
qemu_put_be64(f, vdev->vq[i].pa);
|
|
qemu_put_be16s(f, &vdev->vq[i].last_avail_idx);
|
|
if (k->save_queue) {
|
|
k->save_queue(qbus->parent, i, f);
|
|
}
|
|
}
|
|
|
|
if (vdc->save != NULL) {
|
|
vdc->save(vdev, f);
|
|
}
|
|
|
|
/* Subsections */
|
|
vmstate_save_state(f, &vmstate_virtio, vdev, NULL);
|
|
}
|
|
|
|
int virtio_set_features(VirtIODevice *vdev, uint32_t val)
|
|
{
|
|
BusState *qbus = qdev_get_parent_bus(DEVICE(vdev));
|
|
VirtioBusClass *vbusk = VIRTIO_BUS_GET_CLASS(qbus);
|
|
VirtioDeviceClass *k = VIRTIO_DEVICE_GET_CLASS(vdev);
|
|
uint32_t supported_features = vbusk->get_features(qbus->parent);
|
|
bool bad = (val & ~supported_features) != 0;
|
|
|
|
val &= supported_features;
|
|
if (k->set_features) {
|
|
k->set_features(vdev, val);
|
|
}
|
|
vdev->guest_features = val;
|
|
return bad ? -1 : 0;
|
|
}
|
|
|
|
int virtio_load(VirtIODevice *vdev, QEMUFile *f, int version_id)
|
|
{
|
|
int i, ret;
|
|
int32_t config_len;
|
|
uint32_t num;
|
|
uint32_t features;
|
|
uint32_t supported_features;
|
|
BusState *qbus = qdev_get_parent_bus(DEVICE(vdev));
|
|
VirtioBusClass *k = VIRTIO_BUS_GET_CLASS(qbus);
|
|
VirtioDeviceClass *vdc = VIRTIO_DEVICE_GET_CLASS(vdev);
|
|
|
|
/*
|
|
* We poison the endianness to ensure it does not get used before
|
|
* subsections have been loaded.
|
|
*/
|
|
vdev->device_endian = VIRTIO_DEVICE_ENDIAN_UNKNOWN;
|
|
|
|
if (k->load_config) {
|
|
ret = k->load_config(qbus->parent, f);
|
|
if (ret)
|
|
return ret;
|
|
}
|
|
|
|
qemu_get_8s(f, &vdev->status);
|
|
qemu_get_8s(f, &vdev->isr);
|
|
qemu_get_be16s(f, &vdev->queue_sel);
|
|
if (vdev->queue_sel >= VIRTIO_PCI_QUEUE_MAX) {
|
|
return -1;
|
|
}
|
|
qemu_get_be32s(f, &features);
|
|
|
|
if (virtio_set_features(vdev, features) < 0) {
|
|
supported_features = k->get_features(qbus->parent);
|
|
error_report("Features 0x%x unsupported. Allowed features: 0x%x",
|
|
features, supported_features);
|
|
return -1;
|
|
}
|
|
config_len = qemu_get_be32(f);
|
|
|
|
/*
|
|
* There are cases where the incoming config can be bigger or smaller
|
|
* than what we have; so load what we have space for, and skip
|
|
* any excess that's in the stream.
|
|
*/
|
|
qemu_get_buffer(f, vdev->config, MIN(config_len, vdev->config_len));
|
|
|
|
while (config_len > vdev->config_len) {
|
|
qemu_get_byte(f);
|
|
config_len--;
|
|
}
|
|
|
|
num = qemu_get_be32(f);
|
|
|
|
if (num > VIRTIO_PCI_QUEUE_MAX) {
|
|
error_report("Invalid number of PCI queues: 0x%x", num);
|
|
return -1;
|
|
}
|
|
|
|
for (i = 0; i < num; i++) {
|
|
vdev->vq[i].vring.num = qemu_get_be32(f);
|
|
if (k->has_variable_vring_alignment) {
|
|
vdev->vq[i].vring.align = qemu_get_be32(f);
|
|
}
|
|
vdev->vq[i].pa = qemu_get_be64(f);
|
|
qemu_get_be16s(f, &vdev->vq[i].last_avail_idx);
|
|
vdev->vq[i].signalled_used_valid = false;
|
|
vdev->vq[i].notification = true;
|
|
|
|
if (vdev->vq[i].pa) {
|
|
virtqueue_init(&vdev->vq[i]);
|
|
} else if (vdev->vq[i].last_avail_idx) {
|
|
error_report("VQ %d address 0x0 "
|
|
"inconsistent with Host index 0x%x",
|
|
i, vdev->vq[i].last_avail_idx);
|
|
return -1;
|
|
}
|
|
if (k->load_queue) {
|
|
ret = k->load_queue(qbus->parent, i, f);
|
|
if (ret)
|
|
return ret;
|
|
}
|
|
}
|
|
|
|
virtio_notify_vector(vdev, VIRTIO_NO_VECTOR);
|
|
|
|
if (vdc->load != NULL) {
|
|
ret = vdc->load(vdev, f, version_id);
|
|
if (ret) {
|
|
return ret;
|
|
}
|
|
}
|
|
|
|
/* Subsections */
|
|
ret = vmstate_load_state(f, &vmstate_virtio, vdev, 1);
|
|
if (ret) {
|
|
return ret;
|
|
}
|
|
|
|
if (vdev->device_endian == VIRTIO_DEVICE_ENDIAN_UNKNOWN) {
|
|
vdev->device_endian = virtio_default_endian();
|
|
}
|
|
|
|
for (i = 0; i < num; i++) {
|
|
if (vdev->vq[i].pa) {
|
|
uint16_t nheads;
|
|
nheads = vring_avail_idx(&vdev->vq[i]) - vdev->vq[i].last_avail_idx;
|
|
/* Check it isn't doing strange things with descriptor numbers. */
|
|
if (nheads > vdev->vq[i].vring.num) {
|
|
error_report("VQ %d size 0x%x Guest index 0x%x "
|
|
"inconsistent with Host index 0x%x: delta 0x%x",
|
|
i, vdev->vq[i].vring.num,
|
|
vring_avail_idx(&vdev->vq[i]),
|
|
vdev->vq[i].last_avail_idx, nheads);
|
|
return -1;
|
|
}
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
void virtio_cleanup(VirtIODevice *vdev)
|
|
{
|
|
qemu_del_vm_change_state_handler(vdev->vmstate);
|
|
g_free(vdev->config);
|
|
g_free(vdev->vq);
|
|
}
|
|
|
|
static void virtio_vmstate_change(void *opaque, int running, RunState state)
|
|
{
|
|
VirtIODevice *vdev = opaque;
|
|
BusState *qbus = qdev_get_parent_bus(DEVICE(vdev));
|
|
VirtioBusClass *k = VIRTIO_BUS_GET_CLASS(qbus);
|
|
bool backend_run = running && (vdev->status & VIRTIO_CONFIG_S_DRIVER_OK);
|
|
vdev->vm_running = running;
|
|
|
|
if (backend_run) {
|
|
virtio_set_status(vdev, vdev->status);
|
|
}
|
|
|
|
if (k->vmstate_change) {
|
|
k->vmstate_change(qbus->parent, backend_run);
|
|
}
|
|
|
|
if (!backend_run) {
|
|
virtio_set_status(vdev, vdev->status);
|
|
}
|
|
}
|
|
|
|
void virtio_instance_init_common(Object *proxy_obj, void *data,
|
|
size_t vdev_size, const char *vdev_name)
|
|
{
|
|
DeviceState *vdev = data;
|
|
|
|
object_initialize(vdev, vdev_size, vdev_name);
|
|
object_property_add_child(proxy_obj, "virtio-backend", OBJECT(vdev), NULL);
|
|
object_unref(OBJECT(vdev));
|
|
qdev_alias_all_properties(vdev, proxy_obj);
|
|
}
|
|
|
|
void virtio_init(VirtIODevice *vdev, const char *name,
|
|
uint16_t device_id, size_t config_size)
|
|
{
|
|
int i;
|
|
vdev->device_id = device_id;
|
|
vdev->status = 0;
|
|
vdev->isr = 0;
|
|
vdev->queue_sel = 0;
|
|
vdev->config_vector = VIRTIO_NO_VECTOR;
|
|
vdev->vq = g_malloc0(sizeof(VirtQueue) * VIRTIO_PCI_QUEUE_MAX);
|
|
vdev->vm_running = runstate_is_running();
|
|
for (i = 0; i < VIRTIO_PCI_QUEUE_MAX; i++) {
|
|
vdev->vq[i].vector = VIRTIO_NO_VECTOR;
|
|
vdev->vq[i].vdev = vdev;
|
|
vdev->vq[i].queue_index = i;
|
|
}
|
|
|
|
vdev->name = name;
|
|
vdev->config_len = config_size;
|
|
if (vdev->config_len) {
|
|
vdev->config = g_malloc0(config_size);
|
|
} else {
|
|
vdev->config = NULL;
|
|
}
|
|
vdev->vmstate = qemu_add_vm_change_state_handler(virtio_vmstate_change,
|
|
vdev);
|
|
vdev->device_endian = virtio_default_endian();
|
|
}
|
|
|
|
hwaddr virtio_queue_get_desc_addr(VirtIODevice *vdev, int n)
|
|
{
|
|
return vdev->vq[n].vring.desc;
|
|
}
|
|
|
|
hwaddr virtio_queue_get_avail_addr(VirtIODevice *vdev, int n)
|
|
{
|
|
return vdev->vq[n].vring.avail;
|
|
}
|
|
|
|
hwaddr virtio_queue_get_used_addr(VirtIODevice *vdev, int n)
|
|
{
|
|
return vdev->vq[n].vring.used;
|
|
}
|
|
|
|
hwaddr virtio_queue_get_ring_addr(VirtIODevice *vdev, int n)
|
|
{
|
|
return vdev->vq[n].vring.desc;
|
|
}
|
|
|
|
hwaddr virtio_queue_get_desc_size(VirtIODevice *vdev, int n)
|
|
{
|
|
return sizeof(VRingDesc) * vdev->vq[n].vring.num;
|
|
}
|
|
|
|
hwaddr virtio_queue_get_avail_size(VirtIODevice *vdev, int n)
|
|
{
|
|
return offsetof(VRingAvail, ring) +
|
|
sizeof(uint64_t) * vdev->vq[n].vring.num;
|
|
}
|
|
|
|
hwaddr virtio_queue_get_used_size(VirtIODevice *vdev, int n)
|
|
{
|
|
return offsetof(VRingUsed, ring) +
|
|
sizeof(VRingUsedElem) * vdev->vq[n].vring.num;
|
|
}
|
|
|
|
hwaddr virtio_queue_get_ring_size(VirtIODevice *vdev, int n)
|
|
{
|
|
return vdev->vq[n].vring.used - vdev->vq[n].vring.desc +
|
|
virtio_queue_get_used_size(vdev, n);
|
|
}
|
|
|
|
uint16_t virtio_queue_get_last_avail_idx(VirtIODevice *vdev, int n)
|
|
{
|
|
return vdev->vq[n].last_avail_idx;
|
|
}
|
|
|
|
void virtio_queue_set_last_avail_idx(VirtIODevice *vdev, int n, uint16_t idx)
|
|
{
|
|
vdev->vq[n].last_avail_idx = idx;
|
|
}
|
|
|
|
void virtio_queue_invalidate_signalled_used(VirtIODevice *vdev, int n)
|
|
{
|
|
vdev->vq[n].signalled_used_valid = false;
|
|
}
|
|
|
|
VirtQueue *virtio_get_queue(VirtIODevice *vdev, int n)
|
|
{
|
|
return vdev->vq + n;
|
|
}
|
|
|
|
uint16_t virtio_get_queue_index(VirtQueue *vq)
|
|
{
|
|
return vq->queue_index;
|
|
}
|
|
|
|
static void virtio_queue_guest_notifier_read(EventNotifier *n)
|
|
{
|
|
VirtQueue *vq = container_of(n, VirtQueue, guest_notifier);
|
|
if (event_notifier_test_and_clear(n)) {
|
|
virtio_irq(vq);
|
|
}
|
|
}
|
|
|
|
void virtio_queue_set_guest_notifier_fd_handler(VirtQueue *vq, bool assign,
|
|
bool with_irqfd)
|
|
{
|
|
if (assign && !with_irqfd) {
|
|
event_notifier_set_handler(&vq->guest_notifier,
|
|
virtio_queue_guest_notifier_read);
|
|
} else {
|
|
event_notifier_set_handler(&vq->guest_notifier, NULL);
|
|
}
|
|
if (!assign) {
|
|
/* Test and clear notifier before closing it,
|
|
* in case poll callback didn't have time to run. */
|
|
virtio_queue_guest_notifier_read(&vq->guest_notifier);
|
|
}
|
|
}
|
|
|
|
EventNotifier *virtio_queue_get_guest_notifier(VirtQueue *vq)
|
|
{
|
|
return &vq->guest_notifier;
|
|
}
|
|
|
|
static void virtio_queue_host_notifier_read(EventNotifier *n)
|
|
{
|
|
VirtQueue *vq = container_of(n, VirtQueue, host_notifier);
|
|
if (event_notifier_test_and_clear(n)) {
|
|
virtio_queue_notify_vq(vq);
|
|
}
|
|
}
|
|
|
|
void virtio_queue_set_host_notifier_fd_handler(VirtQueue *vq, bool assign,
|
|
bool set_handler)
|
|
{
|
|
if (assign && set_handler) {
|
|
event_notifier_set_handler(&vq->host_notifier,
|
|
virtio_queue_host_notifier_read);
|
|
} else {
|
|
event_notifier_set_handler(&vq->host_notifier, NULL);
|
|
}
|
|
if (!assign) {
|
|
/* Test and clear notifier before after disabling event,
|
|
* in case poll callback didn't have time to run. */
|
|
virtio_queue_host_notifier_read(&vq->host_notifier);
|
|
}
|
|
}
|
|
|
|
EventNotifier *virtio_queue_get_host_notifier(VirtQueue *vq)
|
|
{
|
|
return &vq->host_notifier;
|
|
}
|
|
|
|
void virtio_device_set_child_bus_name(VirtIODevice *vdev, char *bus_name)
|
|
{
|
|
g_free(vdev->bus_name);
|
|
vdev->bus_name = g_strdup(bus_name);
|
|
}
|
|
|
|
static void virtio_device_realize(DeviceState *dev, Error **errp)
|
|
{
|
|
VirtIODevice *vdev = VIRTIO_DEVICE(dev);
|
|
VirtioDeviceClass *vdc = VIRTIO_DEVICE_GET_CLASS(dev);
|
|
Error *err = NULL;
|
|
|
|
if (vdc->realize != NULL) {
|
|
vdc->realize(dev, &err);
|
|
if (err != NULL) {
|
|
error_propagate(errp, err);
|
|
return;
|
|
}
|
|
}
|
|
virtio_bus_device_plugged(vdev);
|
|
}
|
|
|
|
static void virtio_device_unrealize(DeviceState *dev, Error **errp)
|
|
{
|
|
VirtIODevice *vdev = VIRTIO_DEVICE(dev);
|
|
VirtioDeviceClass *vdc = VIRTIO_DEVICE_GET_CLASS(dev);
|
|
Error *err = NULL;
|
|
|
|
virtio_bus_device_unplugged(vdev);
|
|
|
|
if (vdc->unrealize != NULL) {
|
|
vdc->unrealize(dev, &err);
|
|
if (err != NULL) {
|
|
error_propagate(errp, err);
|
|
return;
|
|
}
|
|
}
|
|
|
|
g_free(vdev->bus_name);
|
|
vdev->bus_name = NULL;
|
|
}
|
|
|
|
static void virtio_device_class_init(ObjectClass *klass, void *data)
|
|
{
|
|
/* Set the default value here. */
|
|
DeviceClass *dc = DEVICE_CLASS(klass);
|
|
|
|
dc->realize = virtio_device_realize;
|
|
dc->unrealize = virtio_device_unrealize;
|
|
dc->bus_type = TYPE_VIRTIO_BUS;
|
|
}
|
|
|
|
static const TypeInfo virtio_device_info = {
|
|
.name = TYPE_VIRTIO_DEVICE,
|
|
.parent = TYPE_DEVICE,
|
|
.instance_size = sizeof(VirtIODevice),
|
|
.class_init = virtio_device_class_init,
|
|
.abstract = true,
|
|
.class_size = sizeof(VirtioDeviceClass),
|
|
};
|
|
|
|
static void virtio_register_types(void)
|
|
{
|
|
type_register_static(&virtio_device_info);
|
|
}
|
|
|
|
type_init(virtio_register_types)
|