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vhost: Regenerate region list from changed sections list
Compare the sections list that's just been generated, and if it's different from the old one regenerate the region list. Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com> Reviewed-by: Michael S. Tsirkin <mst@redhat.com> Signed-off-by: Michael S. Tsirkin <mst@redhat.com> Reviewed-by: Igor Mammedov <imammedo@redhat.com>
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@ -1,6 +1,7 @@
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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_commit(bool started, bool changed) "Started: %d Changed: %d"
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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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@ -643,23 +643,54 @@ static void vhost_commit(MemoryListener *listener)
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MemoryRegionSection *old_sections;
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int n_old_sections;
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uint64_t log_size;
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size_t regions_size;
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int r;
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int i;
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bool changed = false;
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/* Note we can be called before the device is started, but then
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* starting the device calls set_mem_table, so we need to have
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* built the data structures.
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*/
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old_sections = dev->mem_sections;
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n_old_sections = dev->n_mem_sections;
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dev->mem_sections = dev->tmp_sections;
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dev->n_mem_sections = dev->n_tmp_sections;
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if (!dev->memory_changed) {
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if (dev->n_mem_sections != n_old_sections) {
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changed = true;
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} else {
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/* Same size, lets check the contents */
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changed = n_old_sections && memcmp(dev->mem_sections, old_sections,
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n_old_sections * sizeof(old_sections[0])) != 0;
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}
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trace_vhost_commit(dev->started, changed);
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if (!changed) {
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goto out;
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}
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/* Rebuild the regions list from the new sections list */
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regions_size = offsetof(struct vhost_memory, regions) +
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dev->n_mem_sections * sizeof dev->mem->regions[0];
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dev->mem = g_realloc(dev->mem, regions_size);
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dev->mem->nregions = dev->n_mem_sections;
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used_memslots = dev->mem->nregions;
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for (i = 0; i < dev->n_mem_sections; i++) {
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struct vhost_memory_region *cur_vmr = dev->mem->regions + i;
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struct MemoryRegionSection *mrs = dev->mem_sections + i;
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cur_vmr->guest_phys_addr = mrs->offset_within_address_space;
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cur_vmr->memory_size = int128_get64(mrs->size);
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cur_vmr->userspace_addr =
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(uintptr_t)memory_region_get_ram_ptr(mrs->mr) +
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mrs->offset_within_region;
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cur_vmr->flags_padding = 0;
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}
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if (!dev->started) {
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goto out;
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}
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if (dev->mem_changed_start_addr > dev->mem_changed_end_addr) {
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goto out;
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}
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for (i = 0; i < dev->mem->nregions; i++) {
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if (vhost_verify_ring_mappings(dev,
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