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vhost: memory sync fixes 

This fixes two bugs related to memory sync during
migration:
    - ram address calculation was missing the chunk
      address, so the wrong page was dirtied
    - one after last was used instead of the
      end address of a region, which might overflow to 0
      and cause us to skip the region when the region ends at
      ~0x0ull.

Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Tested-by: Jason Wang <jasowang@redhat.com>
This commit is contained in:
Michael S. Tsirkin 2013-02-21 13:16:06 +02:00
parent 864a556e9a
commit 6b37a23df9
1 changed files with 32 additions and 17 deletions
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49
hw/vhost.c
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@ -53,10 +53,14 @@ static void vhost_dev_sync_region(struct vhost_dev *dev,
log = __sync_fetch_and_and(from, 0);
while ((bit = sizeof(log) > sizeof(int) ?
ffsll(log) : ffs(log))) {
ram_addr_t ram_addr;
hwaddr page_addr;
hwaddr section_offset;
hwaddr mr_offset;
bit -= 1;
ram_addr = section->offset_within_region + bit * VHOST_LOG_PAGE;
memory_region_set_dirty(section->mr, ram_addr, VHOST_LOG_PAGE);
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;
@ -65,14 +69,21 @@ static void vhost_dev_sync_region(struct vhost_dev *dev,
static int vhost_sync_dirty_bitmap(struct vhost_dev *dev,
MemoryRegionSection *section,
hwaddr start_addr,
hwaddr end_addr)
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, 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,
@ -93,10 +104,18 @@ static void vhost_log_sync(MemoryListener *listener,
{
struct vhost_dev *dev = container_of(listener, struct vhost_dev,
memory_listener);
hwaddr start_addr = section->offset_within_address_space;
hwaddr end_addr = start_addr + section->size;
vhost_sync_dirty_bitmap(dev, section, 0x0, ~0x0ULL);
}
vhost_sync_dirty_bitmap(dev, section, start_addr, end_addr);
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
@ -268,16 +287,15 @@ 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, i;
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);
for (i = 0; i < dev->n_mem_sections; ++i) {
/* Sync only the range covered by the old log */
vhost_sync_dirty_bitmap(dev, &dev->mem_sections[i], 0,
dev->log_size * VHOST_LOG_CHUNK - 1);
/* 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);
@ -1014,10 +1032,7 @@ void vhost_dev_stop(struct vhost_dev *hdev, VirtIODevice *vdev)
hdev->vqs + i,
hdev->vq_index + i);
}
for (i = 0; i < hdev->n_mem_sections; ++i) {
vhost_sync_dirty_bitmap(hdev, &hdev->mem_sections[i],
0, (hwaddr)~0x0ull);
}
vhost_log_sync_range(hdev, 0, ~0x0ull);
hdev->started = false;
g_free(hdev->log);