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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>
This commit is contained in:
Dr. David Alan Gilbert 2018-01-19 10:39:21 +00:00 committed by Michael S. Tsirkin
parent 48d7c97577
commit ade6d081fc
2 changed files with 36 additions and 4 deletions
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1
hw/virtio/trace-events
View File

@ -1,6 +1,7 @@
# See docs/devel/tracing.txt for syntax documentation.
# hw/virtio/vhost.c
vhost_commit(bool started, bool changed) "Started: %d Changed: %d"
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

39
hw/virtio/vhost.c
View File

@ -643,23 +643,54 @@ static void vhost_commit(MemoryListener *listener)
MemoryRegionSection *old_sections;
int n_old_sections;
uint64_t log_size;
size_t regions_size;
int r;
int i;
bool changed = false;
/* Note we can be called before the device is started, but then
* starting the device calls set_mem_table, so we need to have
* built the data structures.
*/
old_sections = dev->mem_sections;
n_old_sections = dev->n_mem_sections;
dev->mem_sections = dev->tmp_sections;
dev->n_mem_sections = dev->n_tmp_sections;
if (!dev->memory_changed) {
if (dev->n_mem_sections != n_old_sections) {
changed = true;
} else {
/* Same size, lets check the contents */
changed = n_old_sections && memcmp(dev->mem_sections, old_sections,
n_old_sections * sizeof(old_sections[0])) != 0;
}
trace_vhost_commit(dev->started, changed);
if (!changed) {
goto out;
}
/* Rebuild the regions list from the new sections list */
regions_size = offsetof(struct vhost_memory, regions) +
dev->n_mem_sections * sizeof dev->mem->regions[0];
dev->mem = g_realloc(dev->mem, regions_size);
dev->mem->nregions = dev->n_mem_sections;
used_memslots = dev->mem->nregions;
for (i = 0; i < dev->n_mem_sections; i++) {
struct vhost_memory_region *cur_vmr = dev->mem->regions + i;
struct MemoryRegionSection *mrs = dev->mem_sections + i;
cur_vmr->guest_phys_addr = mrs->offset_within_address_space;
cur_vmr->memory_size = int128_get64(mrs->size);
cur_vmr->userspace_addr =
(uintptr_t)memory_region_get_ram_ptr(mrs->mr) +
mrs->offset_within_region;
cur_vmr->flags_padding = 0;
}
if (!dev->started) {
goto out;
}
if (dev->mem_changed_start_addr > dev->mem_changed_end_addr) {
goto out;
}
for (i = 0; i < dev->mem->nregions; i++) {
if (vhost_verify_ring_mappings(dev,