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vhost: Merge sections added to temporary list
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>
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@ -1,5 +1,9 @@
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# See docs/devel/tracing.txt for syntax documentation.
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# hw/virtio/vhost.c
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vhost_region_add_section(const char *name, uint64_t gpa, uint64_t size, uint64_t host) "%s: 0x%"PRIx64"+0x%"PRIx64" @ 0x%"PRIx64
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vhost_region_add_section_abut(const char *name, uint64_t new_size) "%s: 0x%"PRIx64
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# hw/virtio/virtio.c
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virtqueue_alloc_element(void *elem, size_t sz, unsigned in_num, unsigned out_num) "elem %p size %zd in_num %u out_num %u"
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virtqueue_fill(void *vq, const void *elem, unsigned int len, unsigned int idx) "vq %p elem %p len %u idx %u"
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@ -709,14 +709,71 @@ out:
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return;
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}
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static void vhost_add_section(struct vhost_dev *dev,
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MemoryRegionSection *section)
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/* Adds the section data to the tmp_section structure.
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* It relies on the listener calling us in memory address order
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* and for each region (via the _add and _nop methods) to
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* join neighbours.
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*/
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static void vhost_region_add_section(struct vhost_dev *dev,
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MemoryRegionSection *section)
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{
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++dev->n_tmp_sections;
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dev->tmp_sections = g_renew(MemoryRegionSection, dev->tmp_sections,
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dev->n_tmp_sections);
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dev->tmp_sections[dev->n_tmp_sections - 1] = *section;
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memory_region_ref(section->mr);
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bool need_add = true;
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uint64_t mrs_size = int128_get64(section->size);
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uint64_t mrs_gpa = section->offset_within_address_space;
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uintptr_t mrs_host = (uintptr_t)memory_region_get_ram_ptr(section->mr) +
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section->offset_within_region;
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trace_vhost_region_add_section(section->mr->name, mrs_gpa, mrs_size,
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mrs_host);
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bool log_dirty = memory_region_get_dirty_log_mask(section->mr) &
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~(1 << DIRTY_MEMORY_MIGRATION);
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if (log_dirty) {
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return;
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}
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if (dev->n_tmp_sections) {
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/* Since we already have at least one section, lets see if
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* this extends it; since we're scanning in order, we only
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* have to look at the last one, and the FlatView that calls
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* us shouldn't have overlaps.
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*/
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MemoryRegionSection *prev_sec = dev->tmp_sections +
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(dev->n_tmp_sections - 1);
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uint64_t prev_gpa_start = prev_sec->offset_within_address_space;
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uint64_t prev_size = int128_get64(prev_sec->size);
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uint64_t prev_gpa_end = range_get_last(prev_gpa_start, prev_size);
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uint64_t prev_host_start =
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(uintptr_t)memory_region_get_ram_ptr(prev_sec->mr) +
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prev_sec->offset_within_region;
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uint64_t prev_host_end = range_get_last(prev_host_start, prev_size);
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if (prev_gpa_end + 1 == mrs_gpa &&
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prev_host_end + 1 == mrs_host &&
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section->mr == prev_sec->mr &&
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(!dev->vhost_ops->vhost_backend_can_merge ||
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dev->vhost_ops->vhost_backend_can_merge(dev,
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mrs_host, mrs_size,
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prev_host_start, prev_size))) {
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/* The two sections abut */
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need_add = false;
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prev_sec->size = int128_add(prev_sec->size, section->size);
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trace_vhost_region_add_section_abut(section->mr->name,
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mrs_size + prev_size);
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}
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}
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if (need_add) {
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++dev->n_tmp_sections;
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dev->tmp_sections = g_renew(MemoryRegionSection, dev->tmp_sections,
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dev->n_tmp_sections);
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dev->tmp_sections[dev->n_tmp_sections - 1] = *section;
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/* The flatview isn't stable and we don't use it, making it NULL
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* means we can memcmp the list.
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*/
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dev->tmp_sections[dev->n_tmp_sections - 1].fv = NULL;
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memory_region_ref(section->mr);
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}
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}
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static void vhost_region_add(MemoryListener *listener,
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@ -728,11 +785,12 @@ static void vhost_region_add(MemoryListener *listener,
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if (!vhost_section(section)) {
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return;
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}
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vhost_region_add_section(dev, section);
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vhost_add_section(dev, section);
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vhost_set_memory(listener, section, true);
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}
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/* Called on regions that have not changed */
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static void vhost_region_nop(MemoryListener *listener,
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MemoryRegionSection *section)
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{
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@ -743,7 +801,7 @@ static void vhost_region_nop(MemoryListener *listener,
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return;
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}
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vhost_add_section(dev, section);
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vhost_region_add_section(dev, section);
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}
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static void vhost_region_del(MemoryListener *listener,
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