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052e87b073
qemu/hw/virtio/vhost.c
Paolo Bonzini 052e87b073 memory: make section size a 128-bit integer 
So far, the size of all regions passed to listeners could fit in 64 bits,
because artificial regions (containers and aliases) are eliminated by
the memory core, leaving only device regions which have reasonable sizes

An IOMMU however cannot be eliminated by the memory core, and may have
an artificial size, hence we may need 65 bits to represent its size.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2013-06-20 16:32:47 +02:00

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/*
* vhost support
*
* Copyright Red Hat, Inc. 2010
*
* Authors:
* Michael S. Tsirkin <mst@redhat.com>
*
* This work is licensed under the terms of the GNU GPL, version 2. See
* the COPYING file in the top-level directory.
*
* Contributions after 2012-01-13 are licensed under the terms of the
* GNU GPL, version 2 or (at your option) any later version.
*/
#include <sys/ioctl.h>
#include "hw/virtio/vhost.h"
#include "hw/hw.h"
#include "qemu/range.h"
#include <linux/vhost.h>
#include "exec/address-spaces.h"
#include "hw/virtio/virtio-bus.h"
static void vhost_dev_sync_region(struct vhost_dev *dev,
MemoryRegionSection *section,
uint64_t mfirst, uint64_t mlast,
uint64_t rfirst, uint64_t rlast)
{
uint64_t start = MAX(mfirst, rfirst);
uint64_t end = MIN(mlast, rlast);
vhost_log_chunk_t *from = dev->log + start / VHOST_LOG_CHUNK;
vhost_log_chunk_t *to = dev->log + end / VHOST_LOG_CHUNK + 1;
uint64_t addr = (start / VHOST_LOG_CHUNK) * VHOST_LOG_CHUNK;
if (end < start) {
return;
}
assert(end / VHOST_LOG_CHUNK < dev->log_size);
assert(start / VHOST_LOG_CHUNK < dev->log_size);
for (;from < to; ++from) {
vhost_log_chunk_t log;
int bit;
/* We first check with non-atomic: much cheaper,
* and we expect non-dirty to be the common case. */
if (!*from) {
addr += VHOST_LOG_CHUNK;
continue;
}
/* Data must be read atomically. We don't really
* need the barrier semantics of __sync
* builtins, but it's easier to use them than
* roll our own. */
log = __sync_fetch_and_and(from, 0);
while ((bit = sizeof(log) > sizeof(int) ?
ffsll(log) : ffs(log))) {
hwaddr page_addr;
hwaddr section_offset;
hwaddr mr_offset;
bit -= 1;
page_addr = addr + bit * VHOST_LOG_PAGE;
section_offset = page_addr - section->offset_within_address_space;
mr_offset = section_offset + section->offset_within_region;
memory_region_set_dirty(section->mr, mr_offset, VHOST_LOG_PAGE);
log &= ~(0x1ull << bit);
}
addr += VHOST_LOG_CHUNK;
}
}
static int vhost_sync_dirty_bitmap(struct vhost_dev *dev,
MemoryRegionSection *section,
hwaddr first,
hwaddr last)
{
int i;
hwaddr start_addr;
hwaddr end_addr;
if (!dev->log_enabled || !dev->started) {
return 0;
}
start_addr = section->offset_within_address_space;
end_addr = range_get_last(start_addr, int128_get64(section->size));
start_addr = MAX(first, start_addr);
end_addr = MIN(last, end_addr);
for (i = 0; i < dev->mem->nregions; ++i) {
struct vhost_memory_region *reg = dev->mem->regions + i;
vhost_dev_sync_region(dev, section, start_addr, end_addr,
reg->guest_phys_addr,
range_get_last(reg->guest_phys_addr,
reg->memory_size));
}
for (i = 0; i < dev->nvqs; ++i) {
struct vhost_virtqueue *vq = dev->vqs + i;
vhost_dev_sync_region(dev, section, start_addr, end_addr, vq->used_phys,
range_get_last(vq->used_phys, vq->used_size));
}
return 0;
}
static void vhost_log_sync(MemoryListener *listener,
MemoryRegionSection *section)
{
struct vhost_dev *dev = container_of(listener, struct vhost_dev,
memory_listener);
vhost_sync_dirty_bitmap(dev, section, 0x0, ~0x0ULL);
}
static void vhost_log_sync_range(struct vhost_dev *dev,
hwaddr first, hwaddr last)
{
int i;
/* FIXME: this is N^2 in number of sections */
for (i = 0; i < dev->n_mem_sections; ++i) {
MemoryRegionSection *section = &dev->mem_sections[i];
vhost_sync_dirty_bitmap(dev, section, first, last);
}
}
/* Assign/unassign. Keep an unsorted array of non-overlapping
* memory regions in dev->mem. */
static void vhost_dev_unassign_memory(struct vhost_dev *dev,
uint64_t start_addr,
uint64_t size)
{
int from, to, n = dev->mem->nregions;
/* Track overlapping/split regions for sanity checking. */
int overlap_start = 0, overlap_end = 0, overlap_middle = 0, split = 0;
for (from = 0, to = 0; from < n; ++from, ++to) {
struct vhost_memory_region *reg = dev->mem->regions + to;
uint64_t reglast;
uint64_t memlast;
uint64_t change;
/* clone old region */
if (to != from) {
memcpy(reg, dev->mem->regions + from, sizeof *reg);
}
/* No overlap is simple */
if (!ranges_overlap(reg->guest_phys_addr, reg->memory_size,
start_addr, size)) {
continue;
}
/* Split only happens if supplied region
* is in the middle of an existing one. Thus it can not
* overlap with any other existing region. */
assert(!split);
reglast = range_get_last(reg->guest_phys_addr, reg->memory_size);
memlast = range_get_last(start_addr, size);
/* Remove whole region */
if (start_addr <= reg->guest_phys_addr && memlast >= reglast) {
--dev->mem->nregions;
--to;
++overlap_middle;
continue;
}
/* Shrink region */
if (memlast >= reglast) {
reg->memory_size = start_addr - reg->guest_phys_addr;
assert(reg->memory_size);
assert(!overlap_end);
++overlap_end;
continue;
}
/* Shift region */
if (start_addr <= reg->guest_phys_addr) {
change = memlast + 1 - reg->guest_phys_addr;
reg->memory_size -= change;
reg->guest_phys_addr += change;
reg->userspace_addr += change;
assert(reg->memory_size);
assert(!overlap_start);
++overlap_start;
continue;
}
/* This only happens if supplied region
* is in the middle of an existing one. Thus it can not
* overlap with any other existing region. */
assert(!overlap_start);
assert(!overlap_end);
assert(!overlap_middle);
/* Split region: shrink first part, shift second part. */
memcpy(dev->mem->regions + n, reg, sizeof *reg);
reg->memory_size = start_addr - reg->guest_phys_addr;
assert(reg->memory_size);
change = memlast + 1 - reg->guest_phys_addr;
reg = dev->mem->regions + n;
reg->memory_size -= change;
assert(reg->memory_size);
reg->guest_phys_addr += change;
reg->userspace_addr += change;
/* Never add more than 1 region */
assert(dev->mem->nregions == n);
++dev->mem->nregions;
++split;
}
}
/* Called after unassign, so no regions overlap the given range. */
static void vhost_dev_assign_memory(struct vhost_dev *dev,
uint64_t start_addr,
uint64_t size,
uint64_t uaddr)
{
int from, to;
struct vhost_memory_region *merged = NULL;
for (from = 0, to = 0; from < dev->mem->nregions; ++from, ++to) {
struct vhost_memory_region *reg = dev->mem->regions + to;
uint64_t prlast, urlast;
uint64_t pmlast, umlast;
uint64_t s, e, u;
/* clone old region */
if (to != from) {
memcpy(reg, dev->mem->regions + from, sizeof *reg);
}
prlast = range_get_last(reg->guest_phys_addr, reg->memory_size);
pmlast = range_get_last(start_addr, size);
urlast = range_get_last(reg->userspace_addr, reg->memory_size);
umlast = range_get_last(uaddr, size);
/* check for overlapping regions: should never happen. */
assert(prlast < start_addr || pmlast < reg->guest_phys_addr);
/* Not an adjacent or overlapping region - do not merge. */
if ((prlast + 1 != start_addr || urlast + 1 != uaddr) &&
(pmlast + 1 != reg->guest_phys_addr ||
umlast + 1 != reg->userspace_addr)) {
continue;
}
if (merged) {
--to;
assert(to >= 0);
} else {
merged = reg;
}
u = MIN(uaddr, reg->userspace_addr);
s = MIN(start_addr, reg->guest_phys_addr);
e = MAX(pmlast, prlast);
uaddr = merged->userspace_addr = u;
start_addr = merged->guest_phys_addr = s;
size = merged->memory_size = e - s + 1;
assert(merged->memory_size);
}
if (!merged) {
struct vhost_memory_region *reg = dev->mem->regions + to;
memset(reg, 0, sizeof *reg);
reg->memory_size = size;
assert(reg->memory_size);
reg->guest_phys_addr = start_addr;
reg->userspace_addr = uaddr;
++to;
}
assert(to <= dev->mem->nregions + 1);
dev->mem->nregions = to;
}
static uint64_t vhost_get_log_size(struct vhost_dev *dev)
{
uint64_t log_size = 0;
int i;
for (i = 0; i < dev->mem->nregions; ++i) {
struct vhost_memory_region *reg = dev->mem->regions + i;
uint64_t last = range_get_last(reg->guest_phys_addr,
reg->memory_size);
log_size = MAX(log_size, last / VHOST_LOG_CHUNK + 1);
}
for (i = 0; i < dev->nvqs; ++i) {
struct vhost_virtqueue *vq = dev->vqs + i;
uint64_t last = vq->used_phys + vq->used_size - 1;
log_size = MAX(log_size, last / VHOST_LOG_CHUNK + 1);
}
return log_size;
}
static inline void vhost_dev_log_resize(struct vhost_dev* dev, uint64_t size)
{
vhost_log_chunk_t *log;
uint64_t log_base;
int r;
log = g_malloc0(size * sizeof *log);
log_base = (uint64_t)(unsigned long)log;
r = ioctl(dev->control, VHOST_SET_LOG_BASE, &log_base);
assert(r >= 0);
/* Sync only the range covered by the old log */
if (dev->log_size) {
vhost_log_sync_range(dev, 0, dev->log_size * VHOST_LOG_CHUNK - 1);
}
if (dev->log) {
g_free(dev->log);
}
dev->log = log;
dev->log_size = size;
}
static int vhost_verify_ring_mappings(struct vhost_dev *dev,
uint64_t start_addr,
uint64_t size)
{
int i;
for (i = 0; i < dev->nvqs; ++i) {
struct vhost_virtqueue *vq = dev->vqs + i;
hwaddr l;
void *p;
if (!ranges_overlap(start_addr, size, vq->ring_phys, vq->ring_size)) {
continue;
}
l = vq->ring_size;
p = cpu_physical_memory_map(vq->ring_phys, &l, 1);
if (!p || l != vq->ring_size) {
fprintf(stderr, "Unable to map ring buffer for ring %d\n", i);
return -ENOMEM;
}
if (p != vq->ring) {
fprintf(stderr, "Ring buffer relocated for ring %d\n", i);
return -EBUSY;
}
cpu_physical_memory_unmap(p, l, 0, 0);
}
return 0;
}
static struct vhost_memory_region *vhost_dev_find_reg(struct vhost_dev *dev,
uint64_t start_addr,
uint64_t size)
{
int i, n = dev->mem->nregions;
for (i = 0; i < n; ++i) {
struct vhost_memory_region *reg = dev->mem->regions + i;
if (ranges_overlap(reg->guest_phys_addr, reg->memory_size,
start_addr, size)) {
return reg;
}
}
return NULL;
}
static bool vhost_dev_cmp_memory(struct vhost_dev *dev,
uint64_t start_addr,
uint64_t size,
uint64_t uaddr)
{
struct vhost_memory_region *reg = vhost_dev_find_reg(dev, start_addr, size);
uint64_t reglast;
uint64_t memlast;
if (!reg) {
return true;
}
reglast = range_get_last(reg->guest_phys_addr, reg->memory_size);
memlast = range_get_last(start_addr, size);
/* Need to extend region? */
if (start_addr < reg->guest_phys_addr || memlast > reglast) {
return true;
}
/* userspace_addr changed? */
return uaddr != reg->userspace_addr + start_addr - reg->guest_phys_addr;
}
static void vhost_set_memory(MemoryListener *listener,
MemoryRegionSection *section,
bool add)
{
struct vhost_dev *dev = container_of(listener, struct vhost_dev,
memory_listener);
hwaddr start_addr = section->offset_within_address_space;
ram_addr_t size = int128_get64(section->size);
bool log_dirty = memory_region_is_logging(section->mr);
int s = offsetof(struct vhost_memory, regions) +
(dev->mem->nregions + 1) * sizeof dev->mem->regions[0];
void *ram;
dev->mem = g_realloc(dev->mem, s);
if (log_dirty) {
add = false;
}
assert(size);
/* Optimize no-change case. At least cirrus_vga does this a lot at this time. */
ram = memory_region_get_ram_ptr(section->mr) + section->offset_within_region;
if (add) {
if (!vhost_dev_cmp_memory(dev, start_addr, size, (uintptr_t)ram)) {
/* Region exists with same address. Nothing to do. */
return;
}
} else {
if (!vhost_dev_find_reg(dev, start_addr, size)) {
/* Removing region that we don't access. Nothing to do. */
return;
}
}
vhost_dev_unassign_memory(dev, start_addr, size);
if (add) {
/* Add given mapping, merging adjacent regions if any */
vhost_dev_assign_memory(dev, start_addr, size, (uintptr_t)ram);
} else {
/* Remove old mapping for this memory, if any. */
vhost_dev_unassign_memory(dev, start_addr, size);
}
dev->mem_changed_start_addr = MIN(dev->mem_changed_start_addr, start_addr);
dev->mem_changed_end_addr = MAX(dev->mem_changed_end_addr, start_addr + size - 1);
dev->memory_changed = true;
}
static bool vhost_section(MemoryRegionSection *section)
{
return memory_region_is_ram(section->mr);
}
static void vhost_begin(MemoryListener *listener)
{
struct vhost_dev *dev = container_of(listener, struct vhost_dev,
memory_listener);
dev->mem_changed_end_addr = 0;
dev->mem_changed_start_addr = -1;
}
static void vhost_commit(MemoryListener *listener)
{
struct vhost_dev *dev = container_of(listener, struct vhost_dev,
memory_listener);
hwaddr start_addr = 0;
ram_addr_t size = 0;
uint64_t log_size;
int r;
if (!dev->memory_changed) {
return;
}
if (!dev->started) {
return;
}
if (dev->mem_changed_start_addr > dev->mem_changed_end_addr) {
return;
}
if (dev->started) {
start_addr = dev->mem_changed_start_addr;
size = dev->mem_changed_end_addr - dev->mem_changed_start_addr + 1;
r = vhost_verify_ring_mappings(dev, start_addr, size);
assert(r >= 0);
}
if (!dev->log_enabled) {
r = ioctl(dev->control, VHOST_SET_MEM_TABLE, dev->mem);
assert(r >= 0);
dev->memory_changed = false;
return;
}
log_size = vhost_get_log_size(dev);
/* We allocate an extra 4K bytes to log,
* to reduce the * number of reallocations. */
#define VHOST_LOG_BUFFER (0x1000 / sizeof *dev->log)
/* To log more, must increase log size before table update. */
if (dev->log_size < log_size) {
vhost_dev_log_resize(dev, log_size + VHOST_LOG_BUFFER);
}
r = ioctl(dev->control, VHOST_SET_MEM_TABLE, dev->mem);
assert(r >= 0);
/* To log less, can only decrease log size after table update. */
if (dev->log_size > log_size + VHOST_LOG_BUFFER) {
vhost_dev_log_resize(dev, log_size);
}
dev->memory_changed = false;
}
static void vhost_region_add(MemoryListener *listener,
MemoryRegionSection *section)
{
struct vhost_dev *dev = container_of(listener, struct vhost_dev,
memory_listener);
if (!vhost_section(section)) {
return;
}
++dev->n_mem_sections;
dev->mem_sections = g_renew(MemoryRegionSection, dev->mem_sections,
dev->n_mem_sections);
dev->mem_sections[dev->n_mem_sections - 1] = *section;
vhost_set_memory(listener, section, true);
}
static void vhost_region_del(MemoryListener *listener,
MemoryRegionSection *section)
{
struct vhost_dev *dev = container_of(listener, struct vhost_dev,
memory_listener);
int i;
if (!vhost_section(section)) {
return;
}
vhost_set_memory(listener, section, false);
for (i = 0; i < dev->n_mem_sections; ++i) {
if (dev->mem_sections[i].offset_within_address_space
== section->offset_within_address_space) {
--dev->n_mem_sections;
memmove(&dev->mem_sections[i], &dev->mem_sections[i+1],
(dev->n_mem_sections - i) * sizeof(*dev->mem_sections));
break;
}
}
}
static void vhost_region_nop(MemoryListener *listener,
MemoryRegionSection *section)
{
}
static int vhost_virtqueue_set_addr(struct vhost_dev *dev,
struct vhost_virtqueue *vq,
unsigned idx, bool enable_log)
{
struct vhost_vring_addr addr = {
.index = idx,
.desc_user_addr = (uint64_t)(unsigned long)vq->desc,
.avail_user_addr = (uint64_t)(unsigned long)vq->avail,
.used_user_addr = (uint64_t)(unsigned long)vq->used,
.log_guest_addr = vq->used_phys,
.flags = enable_log ? (1 << VHOST_VRING_F_LOG) : 0,
};
int r = ioctl(dev->control, VHOST_SET_VRING_ADDR, &addr);
if (r < 0) {
return -errno;
}
return 0;
}
static int vhost_dev_set_features(struct vhost_dev *dev, bool enable_log)
{
uint64_t features = dev->acked_features;
int r;
if (enable_log) {
features |= 0x1 << VHOST_F_LOG_ALL;
}
r = ioctl(dev->control, VHOST_SET_FEATURES, &features);
return r < 0 ? -errno : 0;
}
static int vhost_dev_set_log(struct vhost_dev *dev, bool enable_log)
{
int r, t, i;
r = vhost_dev_set_features(dev, enable_log);
if (r < 0) {
goto err_features;
}
for (i = 0; i < dev->nvqs; ++i) {
r = vhost_virtqueue_set_addr(dev, dev->vqs + i, i,
enable_log);
if (r < 0) {
goto err_vq;
}
}
return 0;
err_vq:
for (; i >= 0; --i) {
t = vhost_virtqueue_set_addr(dev, dev->vqs + i, i,
dev->log_enabled);
assert(t >= 0);
}
t = vhost_dev_set_features(dev, dev->log_enabled);
assert(t >= 0);
err_features:
return r;
}
static int vhost_migration_log(MemoryListener *listener, int enable)
{
struct vhost_dev *dev = container_of(listener, struct vhost_dev,
memory_listener);
int r;
if (!!enable == dev->log_enabled) {
return 0;
}
if (!dev->started) {
dev->log_enabled = enable;
return 0;
}
if (!enable) {
r = vhost_dev_set_log(dev, false);
if (r < 0) {
return r;
}
if (dev->log) {
g_free(dev->log);
}
dev->log = NULL;
dev->log_size = 0;
} else {
vhost_dev_log_resize(dev, vhost_get_log_size(dev));
r = vhost_dev_set_log(dev, true);
if (r < 0) {
return r;
}
}
dev->log_enabled = enable;
return 0;
}
static void vhost_log_global_start(MemoryListener *listener)
{
int r;
r = vhost_migration_log(listener, true);
if (r < 0) {
abort();
}
}
static void vhost_log_global_stop(MemoryListener *listener)
{
int r;
r = vhost_migration_log(listener, false);
if (r < 0) {
abort();
}
}
static void vhost_log_start(MemoryListener *listener,
MemoryRegionSection *section)
{
/* FIXME: implement */
}
static void vhost_log_stop(MemoryListener *listener,
MemoryRegionSection *section)
{
/* FIXME: implement */
}
static int vhost_virtqueue_start(struct vhost_dev *dev,
struct VirtIODevice *vdev,
struct vhost_virtqueue *vq,
unsigned idx)
{
hwaddr s, l, a;
int r;
int vhost_vq_index = idx - dev->vq_index;
struct vhost_vring_file file = {
.index = vhost_vq_index
};
struct vhost_vring_state state = {
.index = vhost_vq_index
};
struct VirtQueue *vvq = virtio_get_queue(vdev, idx);
assert(idx >= dev->vq_index && idx < dev->vq_index + dev->nvqs);
vq->num = state.num = virtio_queue_get_num(vdev, idx);
r = ioctl(dev->control, VHOST_SET_VRING_NUM, &state);
if (r) {
return -errno;
}
state.num = virtio_queue_get_last_avail_idx(vdev, idx);
r = ioctl(dev->control, VHOST_SET_VRING_BASE, &state);
if (r) {
return -errno;
}
s = l = virtio_queue_get_desc_size(vdev, idx);
a = virtio_queue_get_desc_addr(vdev, idx);
vq->desc = cpu_physical_memory_map(a, &l, 0);
if (!vq->desc || l != s) {
r = -ENOMEM;
goto fail_alloc_desc;
}
s = l = virtio_queue_get_avail_size(vdev, idx);
a = virtio_queue_get_avail_addr(vdev, idx);
vq->avail = cpu_physical_memory_map(a, &l, 0);
if (!vq->avail || l != s) {
r = -ENOMEM;
goto fail_alloc_avail;
}
vq->used_size = s = l = virtio_queue_get_used_size(vdev, idx);
vq->used_phys = a = virtio_queue_get_used_addr(vdev, idx);
vq->used = cpu_physical_memory_map(a, &l, 1);
if (!vq->used || l != s) {
r = -ENOMEM;
goto fail_alloc_used;
}
vq->ring_size = s = l = virtio_queue_get_ring_size(vdev, idx);
vq->ring_phys = a = virtio_queue_get_ring_addr(vdev, idx);
vq->ring = cpu_physical_memory_map(a, &l, 1);
if (!vq->ring || l != s) {
r = -ENOMEM;
goto fail_alloc_ring;
}
r = vhost_virtqueue_set_addr(dev, vq, vhost_vq_index, dev->log_enabled);
if (r < 0) {
r = -errno;
goto fail_alloc;
}
file.fd = event_notifier_get_fd(virtio_queue_get_host_notifier(vvq));
r = ioctl(dev->control, VHOST_SET_VRING_KICK, &file);
if (r) {
r = -errno;
goto fail_kick;
}
/* Clear and discard previous events if any. */
event_notifier_test_and_clear(&vq->masked_notifier);
return 0;
fail_kick:
fail_alloc:
cpu_physical_memory_unmap(vq->ring, virtio_queue_get_ring_size(vdev, idx),
0, 0);
fail_alloc_ring:
cpu_physical_memory_unmap(vq->used, virtio_queue_get_used_size(vdev, idx),
0, 0);
fail_alloc_used:
cpu_physical_memory_unmap(vq->avail, virtio_queue_get_avail_size(vdev, idx),
0, 0);
fail_alloc_avail:
cpu_physical_memory_unmap(vq->desc, virtio_queue_get_desc_size(vdev, idx),
0, 0);
fail_alloc_desc:
return r;
}
static void vhost_virtqueue_stop(struct vhost_dev *dev,
struct VirtIODevice *vdev,
struct vhost_virtqueue *vq,
unsigned idx)
{
struct vhost_vring_state state = {
.index = idx - dev->vq_index
};
int r;
assert(idx >= dev->vq_index && idx < dev->vq_index + dev->nvqs);
r = ioctl(dev->control, VHOST_GET_VRING_BASE, &state);
if (r < 0) {
fprintf(stderr, "vhost VQ %d ring restore failed: %d\n", idx, r);
fflush(stderr);
}
virtio_queue_set_last_avail_idx(vdev, idx, state.num);
assert (r >= 0);
cpu_physical_memory_unmap(vq->ring, virtio_queue_get_ring_size(vdev, idx),
0, virtio_queue_get_ring_size(vdev, idx));
cpu_physical_memory_unmap(vq->used, virtio_queue_get_used_size(vdev, idx),
1, virtio_queue_get_used_size(vdev, idx));
cpu_physical_memory_unmap(vq->avail, virtio_queue_get_avail_size(vdev, idx),
0, virtio_queue_get_avail_size(vdev, idx));
cpu_physical_memory_unmap(vq->desc, virtio_queue_get_desc_size(vdev, idx),
0, virtio_queue_get_desc_size(vdev, idx));
}
static void vhost_eventfd_add(MemoryListener *listener,
MemoryRegionSection *section,
bool match_data, uint64_t data, EventNotifier *e)
{
}
static void vhost_eventfd_del(MemoryListener *listener,
MemoryRegionSection *section,
bool match_data, uint64_t data, EventNotifier *e)
{
}
static int vhost_virtqueue_init(struct vhost_dev *dev,
struct vhost_virtqueue *vq, int n)
{
struct vhost_vring_file file = {
.index = n,
};
int r = event_notifier_init(&vq->masked_notifier, 0);
if (r < 0) {
return r;
}
file.fd = event_notifier_get_fd(&vq->masked_notifier);
r = ioctl(dev->control, VHOST_SET_VRING_CALL, &file);
if (r) {
r = -errno;
goto fail_call;
}
return 0;
fail_call:
event_notifier_cleanup(&vq->masked_notifier);
return r;
}
static void vhost_virtqueue_cleanup(struct vhost_virtqueue *vq)
{
event_notifier_cleanup(&vq->masked_notifier);
}
int vhost_dev_init(struct vhost_dev *hdev, int devfd, const char *devpath,
bool force)
{
uint64_t features;
int i, r;
if (devfd >= 0) {
hdev->control = devfd;
} else {
hdev->control = open(devpath, O_RDWR);
if (hdev->control < 0) {
return -errno;
}
}
r = ioctl(hdev->control, VHOST_SET_OWNER, NULL);
if (r < 0) {
goto fail;
}
r = ioctl(hdev->control, VHOST_GET_FEATURES, &features);
if (r < 0) {
goto fail;
}
for (i = 0; i < hdev->nvqs; ++i) {
r = vhost_virtqueue_init(hdev, hdev->vqs + i, i);
if (r < 0) {
goto fail_vq;
}
}
hdev->features = features;
hdev->memory_listener = (MemoryListener) {
.begin = vhost_begin,
.commit = vhost_commit,
.region_add = vhost_region_add,
.region_del = vhost_region_del,
.region_nop = vhost_region_nop,
.log_start = vhost_log_start,
.log_stop = vhost_log_stop,
.log_sync = vhost_log_sync,
.log_global_start = vhost_log_global_start,
.log_global_stop = vhost_log_global_stop,
.eventfd_add = vhost_eventfd_add,
.eventfd_del = vhost_eventfd_del,
.priority = 10
};
hdev->mem = g_malloc0(offsetof(struct vhost_memory, regions));
hdev->n_mem_sections = 0;
hdev->mem_sections = NULL;
hdev->log = NULL;
hdev->log_size = 0;
hdev->log_enabled = false;
hdev->started = false;
hdev->memory_changed = false;
memory_listener_register(&hdev->memory_listener, &address_space_memory);
hdev->force = force;
return 0;
fail_vq:
while (--i >= 0) {
vhost_virtqueue_cleanup(hdev->vqs + i);
}
fail:
r = -errno;
close(hdev->control);
return r;
}
void vhost_dev_cleanup(struct vhost_dev *hdev)
{
int i;
for (i = 0; i < hdev->nvqs; ++i) {
vhost_virtqueue_cleanup(hdev->vqs + i);
}
memory_listener_unregister(&hdev->memory_listener);
g_free(hdev->mem);
g_free(hdev->mem_sections);
close(hdev->control);
}
bool vhost_dev_query(struct vhost_dev *hdev, VirtIODevice *vdev)
{
BusState *qbus = BUS(qdev_get_parent_bus(DEVICE(vdev)));
VirtioBusState *vbus = VIRTIO_BUS(qbus);
VirtioBusClass *k = VIRTIO_BUS_GET_CLASS(vbus);
return !k->query_guest_notifiers ||
k->query_guest_notifiers(qbus->parent) ||
hdev->force;
}
/* Stop processing guest IO notifications in qemu.
* Start processing them in vhost in kernel.
*/
int vhost_dev_enable_notifiers(struct vhost_dev *hdev, VirtIODevice *vdev)
{
BusState *qbus = BUS(qdev_get_parent_bus(DEVICE(vdev)));
VirtioBusState *vbus = VIRTIO_BUS(qbus);
VirtioBusClass *k = VIRTIO_BUS_GET_CLASS(vbus);
int i, r;
if (!k->set_host_notifier) {
fprintf(stderr, "binding does not support host notifiers\n");
r = -ENOSYS;
goto fail;
}
for (i = 0; i < hdev->nvqs; ++i) {
r = k->set_host_notifier(qbus->parent, hdev->vq_index + i, true);
if (r < 0) {
fprintf(stderr, "vhost VQ %d notifier binding failed: %d\n", i, -r);
goto fail_vq;
}
}
return 0;
fail_vq:
while (--i >= 0) {
r = k->set_host_notifier(qbus->parent, hdev->vq_index + i, false);
if (r < 0) {
fprintf(stderr, "vhost VQ %d notifier cleanup error: %d\n", i, -r);
fflush(stderr);
}
assert (r >= 0);
}
fail:
return r;
}
/* Stop processing guest IO notifications in vhost.
* Start processing them in qemu.
* This might actually run the qemu handlers right away,
* so virtio in qemu must be completely setup when this is called.
*/
void vhost_dev_disable_notifiers(struct vhost_dev *hdev, VirtIODevice *vdev)
{
BusState *qbus = BUS(qdev_get_parent_bus(DEVICE(vdev)));
VirtioBusState *vbus = VIRTIO_BUS(qbus);
VirtioBusClass *k = VIRTIO_BUS_GET_CLASS(vbus);
int i, r;
for (i = 0; i < hdev->nvqs; ++i) {
r = k->set_host_notifier(qbus->parent, hdev->vq_index + i, false);
if (r < 0) {
fprintf(stderr, "vhost VQ %d notifier cleanup failed: %d\n", i, -r);
fflush(stderr);
}
assert (r >= 0);
}
}
/* Test and clear event pending status.
* Should be called after unmask to avoid losing events.
*/
bool vhost_virtqueue_pending(struct vhost_dev *hdev, int n)
{
struct vhost_virtqueue *vq = hdev->vqs + n - hdev->vq_index;
assert(hdev->started);
assert(n >= hdev->vq_index && n < hdev->vq_index + hdev->nvqs);
return event_notifier_test_and_clear(&vq->masked_notifier);
}
/* Mask/unmask events from this vq. */
void vhost_virtqueue_mask(struct vhost_dev *hdev, VirtIODevice *vdev, int n,
bool mask)
{
struct VirtQueue *vvq = virtio_get_queue(vdev, n);
int r, index = n - hdev->vq_index;
assert(hdev->started);
assert(n >= hdev->vq_index && n < hdev->vq_index + hdev->nvqs);
struct vhost_vring_file file = {
.index = index
};
if (mask) {
file.fd = event_notifier_get_fd(&hdev->vqs[index].masked_notifier);
} else {
file.fd = event_notifier_get_fd(virtio_queue_get_guest_notifier(vvq));
}
r = ioctl(hdev->control, VHOST_SET_VRING_CALL, &file);
assert(r >= 0);
}
/* Host notifiers must be enabled at this point. */
int vhost_dev_start(struct vhost_dev *hdev, VirtIODevice *vdev)
{
int i, r;
hdev->started = true;
r = vhost_dev_set_features(hdev, hdev->log_enabled);
if (r < 0) {
goto fail_features;
}
r = ioctl(hdev->control, VHOST_SET_MEM_TABLE, hdev->mem);
if (r < 0) {
r = -errno;
goto fail_mem;
}
for (i = 0; i < hdev->nvqs; ++i) {
r = vhost_virtqueue_start(hdev,
vdev,
hdev->vqs + i,
hdev->vq_index + i);
if (r < 0) {
goto fail_vq;
}
}
if (hdev->log_enabled) {
hdev->log_size = vhost_get_log_size(hdev);
hdev->log = hdev->log_size ?
g_malloc0(hdev->log_size * sizeof *hdev->log) : NULL;
r = ioctl(hdev->control, VHOST_SET_LOG_BASE,
(uint64_t)(unsigned long)hdev->log);
if (r < 0) {
r = -errno;
goto fail_log;
}
}
return 0;
fail_log:
fail_vq:
while (--i >= 0) {
vhost_virtqueue_stop(hdev,
vdev,
hdev->vqs + i,
hdev->vq_index + i);
}
i = hdev->nvqs;
fail_mem:
fail_features:
hdev->started = false;
return r;
}
/* Host notifiers must be enabled at this point. */
void vhost_dev_stop(struct vhost_dev *hdev, VirtIODevice *vdev)
{
int i;
for (i = 0; i < hdev->nvqs; ++i) {
vhost_virtqueue_stop(hdev,
vdev,
hdev->vqs + i,
hdev->vq_index + i);
}
vhost_log_sync_range(hdev, 0, ~0x0ull);
hdev->started = false;
g_free(hdev->log);
hdev->log = NULL;
hdev->log_size = 0;
}
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