1059 lines
28 KiB
C
1059 lines
28 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 "qemu/error-report.h"
|
|
#include "virtio.h"
|
|
#include "qemu/atomic.h"
|
|
|
|
/* The alignment to use between consumer and producer parts of vring.
|
|
* x86 pagesize again. */
|
|
#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;
|
|
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;
|
|
|
|
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]),
|
|
VIRTIO_PCI_VRING_ALIGN);
|
|
}
|
|
|
|
static inline uint64_t vring_desc_addr(hwaddr desc_pa, int i)
|
|
{
|
|
hwaddr pa;
|
|
pa = desc_pa + sizeof(VRingDesc) * i + offsetof(VRingDesc, addr);
|
|
return ldq_phys(pa);
|
|
}
|
|
|
|
static inline uint32_t vring_desc_len(hwaddr desc_pa, int i)
|
|
{
|
|
hwaddr pa;
|
|
pa = desc_pa + sizeof(VRingDesc) * i + offsetof(VRingDesc, len);
|
|
return ldl_phys(pa);
|
|
}
|
|
|
|
static inline uint16_t vring_desc_flags(hwaddr desc_pa, int i)
|
|
{
|
|
hwaddr pa;
|
|
pa = desc_pa + sizeof(VRingDesc) * i + offsetof(VRingDesc, flags);
|
|
return lduw_phys(pa);
|
|
}
|
|
|
|
static inline uint16_t vring_desc_next(hwaddr desc_pa, int i)
|
|
{
|
|
hwaddr pa;
|
|
pa = desc_pa + sizeof(VRingDesc) * i + offsetof(VRingDesc, next);
|
|
return lduw_phys(pa);
|
|
}
|
|
|
|
static inline uint16_t vring_avail_flags(VirtQueue *vq)
|
|
{
|
|
hwaddr pa;
|
|
pa = vq->vring.avail + offsetof(VRingAvail, flags);
|
|
return lduw_phys(pa);
|
|
}
|
|
|
|
static inline uint16_t vring_avail_idx(VirtQueue *vq)
|
|
{
|
|
hwaddr pa;
|
|
pa = vq->vring.avail + offsetof(VRingAvail, idx);
|
|
return lduw_phys(pa);
|
|
}
|
|
|
|
static inline uint16_t vring_avail_ring(VirtQueue *vq, int i)
|
|
{
|
|
hwaddr pa;
|
|
pa = vq->vring.avail + offsetof(VRingAvail, ring[i]);
|
|
return lduw_phys(pa);
|
|
}
|
|
|
|
static inline uint16_t vring_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);
|
|
stl_phys(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);
|
|
stl_phys(pa, val);
|
|
}
|
|
|
|
static uint16_t vring_used_idx(VirtQueue *vq)
|
|
{
|
|
hwaddr pa;
|
|
pa = vq->vring.used + offsetof(VRingUsed, idx);
|
|
return lduw_phys(pa);
|
|
}
|
|
|
|
static inline void vring_used_idx_set(VirtQueue *vq, uint16_t val)
|
|
{
|
|
hwaddr pa;
|
|
pa = vq->vring.used + offsetof(VRingUsed, idx);
|
|
stw_phys(pa, val);
|
|
}
|
|
|
|
static inline void vring_used_flags_set_bit(VirtQueue *vq, int mask)
|
|
{
|
|
hwaddr pa;
|
|
pa = vq->vring.used + offsetof(VRingUsed, flags);
|
|
stw_phys(pa, lduw_phys(pa) | mask);
|
|
}
|
|
|
|
static inline void vring_used_flags_unset_bit(VirtQueue *vq, int mask)
|
|
{
|
|
hwaddr pa;
|
|
pa = vq->vring.used + offsetof(VRingUsed, flags);
|
|
stw_phys(pa, lduw_phys(pa) & ~mask);
|
|
}
|
|
|
|
static inline void vring_avail_event(VirtQueue *vq, uint16_t val)
|
|
{
|
|
hwaddr pa;
|
|
if (!vq->notification) {
|
|
return;
|
|
}
|
|
pa = vq->vring.used + offsetof(VRingUsed, ring[vq->vring.num]);
|
|
stw_phys(pa, val);
|
|
}
|
|
|
|
void virtio_queue_set_notification(VirtQueue *vq, int enable)
|
|
{
|
|
vq->notification = enable;
|
|
if (vq->vdev->guest_features & (1 << VIRTIO_RING_F_EVENT_IDX)) {
|
|
vring_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(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(desc_pa, i) & VRING_DESC_F_NEXT))
|
|
return max;
|
|
|
|
/* Check they're not leading us off end of descriptors. */
|
|
next = vring_desc_next(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)) {
|
|
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(desc_pa, i) & VRING_DESC_F_INDIRECT) {
|
|
if (vring_desc_len(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(desc_pa, i) / sizeof(VRingDesc);
|
|
num_bufs = i = 0;
|
|
desc_pa = vring_desc_addr(desc_pa, i);
|
|
}
|
|
|
|
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(desc_pa, i) & VRING_DESC_F_WRITE) {
|
|
in_total += vring_desc_len(desc_pa, i);
|
|
} else {
|
|
out_total += vring_desc_len(desc_pa, i);
|
|
}
|
|
if (in_total >= max_in_bytes && out_total >= max_out_bytes) {
|
|
goto done;
|
|
}
|
|
} while ((i = virtqueue_next_desc(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;
|
|
|
|
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: 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;
|
|
|
|
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 (vq->vdev->guest_features & (1 << VIRTIO_RING_F_EVENT_IDX)) {
|
|
vring_avail_event(vq, vring_avail_idx(vq));
|
|
}
|
|
|
|
if (vring_desc_flags(desc_pa, i) & VRING_DESC_F_INDIRECT) {
|
|
if (vring_desc_len(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(desc_pa, i) / sizeof(VRingDesc);
|
|
desc_pa = vring_desc_addr(desc_pa, i);
|
|
i = 0;
|
|
}
|
|
|
|
/* Collect all the descriptors */
|
|
do {
|
|
struct iovec *sg;
|
|
|
|
if (vring_desc_flags(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(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(desc_pa, i);
|
|
sg = &elem->out_sg[elem->out_num++];
|
|
}
|
|
|
|
sg->iov_len = vring_desc_len(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(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)
|
|
{
|
|
if (vdev->binding->notify) {
|
|
vdev->binding->notify(vdev->binding_opaque, vector);
|
|
}
|
|
}
|
|
|
|
void virtio_update_irq(VirtIODevice *vdev)
|
|
{
|
|
virtio_notify_vector(vdev, VIRTIO_NO_VECTOR);
|
|
}
|
|
|
|
void virtio_set_status(VirtIODevice *vdev, uint8_t val)
|
|
{
|
|
trace_virtio_set_status(vdev, val);
|
|
|
|
if (vdev->set_status) {
|
|
vdev->set_status(vdev, val);
|
|
}
|
|
vdev->status = val;
|
|
}
|
|
|
|
void virtio_reset(void *opaque)
|
|
{
|
|
VirtIODevice *vdev = opaque;
|
|
int i;
|
|
|
|
virtio_set_status(vdev, 0);
|
|
|
|
if (vdev->reset)
|
|
vdev->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)
|
|
{
|
|
uint8_t val;
|
|
|
|
vdev->get_config(vdev, vdev->config);
|
|
|
|
if (addr > (vdev->config_len - sizeof(val)))
|
|
return (uint32_t)-1;
|
|
|
|
val = ldub_p(vdev->config + addr);
|
|
return val;
|
|
}
|
|
|
|
uint32_t virtio_config_readw(VirtIODevice *vdev, uint32_t addr)
|
|
{
|
|
uint16_t val;
|
|
|
|
vdev->get_config(vdev, vdev->config);
|
|
|
|
if (addr > (vdev->config_len - sizeof(val)))
|
|
return (uint32_t)-1;
|
|
|
|
val = lduw_p(vdev->config + addr);
|
|
return val;
|
|
}
|
|
|
|
uint32_t virtio_config_readl(VirtIODevice *vdev, uint32_t addr)
|
|
{
|
|
uint32_t val;
|
|
|
|
vdev->get_config(vdev, vdev->config);
|
|
|
|
if (addr > (vdev->config_len - sizeof(val)))
|
|
return (uint32_t)-1;
|
|
|
|
val = ldl_p(vdev->config + addr);
|
|
return val;
|
|
}
|
|
|
|
void virtio_config_writeb(VirtIODevice *vdev, uint32_t addr, uint32_t data)
|
|
{
|
|
uint8_t val = data;
|
|
|
|
if (addr > (vdev->config_len - sizeof(val)))
|
|
return;
|
|
|
|
stb_p(vdev->config + addr, val);
|
|
|
|
if (vdev->set_config)
|
|
vdev->set_config(vdev, vdev->config);
|
|
}
|
|
|
|
void virtio_config_writew(VirtIODevice *vdev, uint32_t addr, uint32_t data)
|
|
{
|
|
uint16_t val = data;
|
|
|
|
if (addr > (vdev->config_len - sizeof(val)))
|
|
return;
|
|
|
|
stw_p(vdev->config + addr, val);
|
|
|
|
if (vdev->set_config)
|
|
vdev->set_config(vdev, vdev->config);
|
|
}
|
|
|
|
void virtio_config_writel(VirtIODevice *vdev, uint32_t addr, uint32_t data)
|
|
{
|
|
uint32_t val = data;
|
|
|
|
if (addr > (vdev->config_len - sizeof(val)))
|
|
return;
|
|
|
|
stl_p(vdev->config + addr, val);
|
|
|
|
if (vdev->set_config)
|
|
vdev->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;
|
|
}
|
|
|
|
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_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].handle_output = handle_output;
|
|
|
|
return &vdev->vq[i];
|
|
}
|
|
|
|
void virtio_irq(VirtQueue *vq)
|
|
{
|
|
trace_virtio_irq(vq);
|
|
vq->vdev->isr |= 0x01;
|
|
virtio_notify_vector(vq->vdev, vq->vector);
|
|
}
|
|
|
|
/* Assuming a given event_idx value from the other size, if
|
|
* we have just incremented index from old to new_idx,
|
|
* should we trigger an event? */
|
|
static inline int vring_need_event(uint16_t event, uint16_t new, uint16_t old)
|
|
{
|
|
/* Note: Xen has similar logic for notification hold-off
|
|
* in include/xen/interface/io/ring.h with req_event and req_prod
|
|
* corresponding to event_idx + 1 and new respectively.
|
|
* Note also that req_event and req_prod in Xen start at 1,
|
|
* event indexes in virtio start at 0. */
|
|
return (uint16_t)(new - event - 1) < (uint16_t)(new - old);
|
|
}
|
|
|
|
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 (((vdev->guest_features & (1 << VIRTIO_F_NOTIFY_ON_EMPTY)) &&
|
|
!vq->inuse && vring_avail_idx(vq) == vq->last_avail_idx)) {
|
|
return true;
|
|
}
|
|
|
|
if (!(vdev->guest_features & (1 << 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_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);
|
|
}
|
|
|
|
void virtio_save(VirtIODevice *vdev, QEMUFile *f)
|
|
{
|
|
int i;
|
|
|
|
if (vdev->binding->save_config)
|
|
vdev->binding->save_config(vdev->binding_opaque, 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);
|
|
qemu_put_be64(f, vdev->vq[i].pa);
|
|
qemu_put_be16s(f, &vdev->vq[i].last_avail_idx);
|
|
if (vdev->binding->save_queue)
|
|
vdev->binding->save_queue(vdev->binding_opaque, i, f);
|
|
}
|
|
}
|
|
|
|
int virtio_set_features(VirtIODevice *vdev, uint32_t val)
|
|
{
|
|
uint32_t supported_features =
|
|
vdev->binding->get_features(vdev->binding_opaque);
|
|
bool bad = (val & ~supported_features) != 0;
|
|
|
|
val &= supported_features;
|
|
if (vdev->set_features) {
|
|
vdev->set_features(vdev, val);
|
|
}
|
|
vdev->guest_features = val;
|
|
return bad ? -1 : 0;
|
|
}
|
|
|
|
int virtio_load(VirtIODevice *vdev, QEMUFile *f)
|
|
{
|
|
int num, i, ret;
|
|
uint32_t features;
|
|
uint32_t supported_features;
|
|
|
|
if (vdev->binding->load_config) {
|
|
ret = vdev->binding->load_config(vdev->binding_opaque, f);
|
|
if (ret)
|
|
return ret;
|
|
}
|
|
|
|
qemu_get_8s(f, &vdev->status);
|
|
qemu_get_8s(f, &vdev->isr);
|
|
qemu_get_be16s(f, &vdev->queue_sel);
|
|
qemu_get_be32s(f, &features);
|
|
|
|
if (virtio_set_features(vdev, features) < 0) {
|
|
supported_features = vdev->binding->get_features(vdev->binding_opaque);
|
|
error_report("Features 0x%x unsupported. Allowed features: 0x%x",
|
|
features, supported_features);
|
|
return -1;
|
|
}
|
|
vdev->config_len = qemu_get_be32(f);
|
|
qemu_get_buffer(f, vdev->config, vdev->config_len);
|
|
|
|
num = qemu_get_be32(f);
|
|
|
|
for (i = 0; i < num; i++) {
|
|
vdev->vq[i].vring.num = 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) {
|
|
uint16_t nheads;
|
|
virtqueue_init(&vdev->vq[i]);
|
|
nheads = vring_avail_idx(&vdev->vq[i]) - vdev->vq[i].last_avail_idx;
|
|
/* Check it isn't doing very 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;
|
|
}
|
|
} 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 (vdev->binding->load_queue) {
|
|
ret = vdev->binding->load_queue(vdev->binding_opaque, i, f);
|
|
if (ret)
|
|
return ret;
|
|
}
|
|
}
|
|
|
|
virtio_notify_vector(vdev, VIRTIO_NO_VECTOR);
|
|
return 0;
|
|
}
|
|
|
|
void virtio_cleanup(VirtIODevice *vdev)
|
|
{
|
|
qemu_del_vm_change_state_handler(vdev->vmstate);
|
|
g_free(vdev->config);
|
|
g_free(vdev->vq);
|
|
g_free(vdev);
|
|
}
|
|
|
|
static void virtio_vmstate_change(void *opaque, int running, RunState state)
|
|
{
|
|
VirtIODevice *vdev = opaque;
|
|
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 (vdev->binding->vmstate_change) {
|
|
vdev->binding->vmstate_change(vdev->binding_opaque, backend_run);
|
|
}
|
|
|
|
if (!backend_run) {
|
|
virtio_set_status(vdev, vdev->status);
|
|
}
|
|
}
|
|
|
|
VirtIODevice *virtio_common_init(const char *name, uint16_t device_id,
|
|
size_t config_size, size_t struct_size)
|
|
{
|
|
VirtIODevice *vdev;
|
|
int i;
|
|
|
|
vdev = g_malloc0(struct_size);
|
|
|
|
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->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);
|
|
|
|
return vdev;
|
|
}
|
|
|
|
void virtio_bind_device(VirtIODevice *vdev, const VirtIOBindings *binding,
|
|
DeviceState *opaque)
|
|
{
|
|
vdev->binding = binding;
|
|
vdev->binding_opaque = opaque;
|
|
}
|
|
|
|
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;
|
|
}
|
|
|
|
VirtQueue *virtio_get_queue(VirtIODevice *vdev, int n)
|
|
{
|
|
return vdev->vq + n;
|
|
}
|
|
|
|
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;
|
|
}
|