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vhost: Merge sections added to temporary list

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As sections are reported by the listener to the _nop and _add
methods, add them to the temporary section list but now merge them
with the previous section if the new one abuts and the backend allows.

Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
Reviewed-by: Igor Mammedov <imammedo@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
This commit is contained in:
Dr. David Alan Gilbert 2018-01-19 10:39:20 +00:00 committed by Michael S. Tsirkin
parent 0ca1fd2d68
commit 48d7c97577
2 changed files with 71 additions and 9 deletions
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4
hw/virtio/trace-events
View File

@ -1,5 +1,9 @@
# See docs/devel/tracing.txt for syntax documentation.
# hw/virtio/vhost.c
vhost_region_add_section(const char *name, uint64_t gpa, uint64_t size, uint64_t host) "%s: 0x%"PRIx64"+0x%"PRIx64" @ 0x%"PRIx64
vhost_region_add_section_abut(const char *name, uint64_t new_size) "%s: 0x%"PRIx64
# hw/virtio/virtio.c
virtqueue_alloc_element(void *elem, size_t sz, unsigned in_num, unsigned out_num) "elem %p size %zd in_num %u out_num %u"
virtqueue_fill(void *vq, const void *elem, unsigned int len, unsigned int idx) "vq %p elem %p len %u idx %u"

64
hw/virtio/vhost.c
View File

@ -709,14 +709,71 @@ out:
return;
}
static void vhost_add_section(struct vhost_dev *dev,
/* Adds the section data to the tmp_section structure.
* It relies on the listener calling us in memory address order
* and for each region (via the _add and _nop methods) to
* join neighbours.
*/
static void vhost_region_add_section(struct vhost_dev *dev,
MemoryRegionSection *section)
{
bool need_add = true;
uint64_t mrs_size = int128_get64(section->size);
uint64_t mrs_gpa = section->offset_within_address_space;
uintptr_t mrs_host = (uintptr_t)memory_region_get_ram_ptr(section->mr) +
section->offset_within_region;
trace_vhost_region_add_section(section->mr->name, mrs_gpa, mrs_size,
mrs_host);
bool log_dirty = memory_region_get_dirty_log_mask(section->mr) &
~(1 << DIRTY_MEMORY_MIGRATION);
if (log_dirty) {
return;
}
if (dev->n_tmp_sections) {
/* Since we already have at least one section, lets see if
* this extends it; since we're scanning in order, we only
* have to look at the last one, and the FlatView that calls
* us shouldn't have overlaps.
*/
MemoryRegionSection *prev_sec = dev->tmp_sections +
(dev->n_tmp_sections - 1);
uint64_t prev_gpa_start = prev_sec->offset_within_address_space;
uint64_t prev_size = int128_get64(prev_sec->size);
uint64_t prev_gpa_end = range_get_last(prev_gpa_start, prev_size);
uint64_t prev_host_start =
(uintptr_t)memory_region_get_ram_ptr(prev_sec->mr) +
prev_sec->offset_within_region;
uint64_t prev_host_end = range_get_last(prev_host_start, prev_size);
if (prev_gpa_end + 1 == mrs_gpa &&
prev_host_end + 1 == mrs_host &&
section->mr == prev_sec->mr &&
(!dev->vhost_ops->vhost_backend_can_merge ||
dev->vhost_ops->vhost_backend_can_merge(dev,
mrs_host, mrs_size,
prev_host_start, prev_size))) {
/* The two sections abut */
need_add = false;
prev_sec->size = int128_add(prev_sec->size, section->size);
trace_vhost_region_add_section_abut(section->mr->name,
mrs_size + prev_size);
}
}
if (need_add) {
++dev->n_tmp_sections;
dev->tmp_sections = g_renew(MemoryRegionSection, dev->tmp_sections,
dev->n_tmp_sections);
dev->tmp_sections[dev->n_tmp_sections - 1] = *section;
/* The flatview isn't stable and we don't use it, making it NULL
* means we can memcmp the list.
*/
dev->tmp_sections[dev->n_tmp_sections - 1].fv = NULL;
memory_region_ref(section->mr);
}
}
static void vhost_region_add(MemoryListener *listener,
@ -728,11 +785,12 @@ static void vhost_region_add(MemoryListener *listener,
if (!vhost_section(section)) {
return;
}
vhost_region_add_section(dev, section);
vhost_add_section(dev, section);
vhost_set_memory(listener, section, true);
}
/* Called on regions that have not changed */
static void vhost_region_nop(MemoryListener *listener,
MemoryRegionSection *section)
{
@ -743,7 +801,7 @@ static void vhost_region_nop(MemoryListener *listener,
return;
}
vhost_add_section(dev, section);
vhost_region_add_section(dev, section);
}
static void vhost_region_del(MemoryListener *listener,