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[Qemu-devel] [PULL 06/26] vhost: Merge sections added to temporary list
From: |
Michael S. Tsirkin |
Subject: |
[Qemu-devel] [PULL 06/26] vhost: Merge sections added to temporary list |
Date: |
Thu, 8 Feb 2018 21:09:02 +0200 |
From: "Dr. David Alan Gilbert" <address@hidden>
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 <address@hidden>
Reviewed-by: Igor Mammedov <address@hidden>
Reviewed-by: Michael S. Tsirkin <address@hidden>
Signed-off-by: Michael S. Tsirkin <address@hidden>
---
hw/virtio/vhost.c | 76 ++++++++++++++++++++++++++++++++++++++++++++------
hw/virtio/trace-events | 4 +++
2 files changed, 71 insertions(+), 9 deletions(-)
diff --git a/hw/virtio/vhost.c b/hw/virtio/vhost.c
index 91cab51..351c691 100644
--- a/hw/virtio/vhost.c
+++ b/hw/virtio/vhost.c
@@ -709,14 +709,71 @@ out:
return;
}
-static void vhost_add_section(struct vhost_dev *dev,
- MemoryRegionSection *section)
+/* 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)
{
- ++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;
- memory_region_ref(section->mr);
+ 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,
diff --git a/hw/virtio/trace-events b/hw/virtio/trace-events
index 775461a..ab9da06 100644
--- a/hw/virtio/trace-events
+++ b/hw/virtio/trace-events
@@ -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"
--
MST
- [Qemu-devel] [PULL 00/26] virtio, vhost, pci, pc: features, fixes and cleanups, Michael S. Tsirkin, 2018/02/08
- [Qemu-devel] [PULL 01/26] Revert "vhost: add traces for memory listeners", Michael S. Tsirkin, 2018/02/08
- [Qemu-devel] [PULL 04/26] vhost: Build temporary section list and deref after commit, Michael S. Tsirkin, 2018/02/08
- [Qemu-devel] [PULL 02/26] virtio: remove event notifier cleanup call on de-assign, Michael S. Tsirkin, 2018/02/08
- [Qemu-devel] [PULL 05/26] vhost: Simplify ring verification checks, Michael S. Tsirkin, 2018/02/08
- [Qemu-devel] [PULL 06/26] vhost: Merge sections added to temporary list,
Michael S. Tsirkin <=
- [Qemu-devel] [PULL 07/26] vhost: Regenerate region list from changed sections list, Michael S. Tsirkin, 2018/02/08
- [Qemu-devel] [PULL 09/26] vhost: Merge and delete unused callbacks, Michael S. Tsirkin, 2018/02/08
- [Qemu-devel] [PULL 10/26] vhost: Move log_dirty check, Michael S. Tsirkin, 2018/02/08
- [Qemu-devel] [PULL 11/26] pci-bridge/i82801b11: clear bridge registers on platform reset, Michael S. Tsirkin, 2018/02/08
- [Qemu-devel] [PULL 08/26] vhost: Clean out old vhost_set_memory and friends, Michael S. Tsirkin, 2018/02/08
- [Qemu-devel] [PULL 13/26] virtio-blk: enable multiple vectors when using multiple I/O queues, Michael S. Tsirkin, 2018/02/08
- [Qemu-devel] [PULL 12/26] pci/bus: let it has higher migration priority, Michael S. Tsirkin, 2018/02/08
- [Qemu-devel] [PULL 17/26] cryptodev-vhost-user: add crypto session handler, Michael S. Tsirkin, 2018/02/08
- [Qemu-devel] [PULL 16/26] cryptodev: add vhost support, Michael S. Tsirkin, 2018/02/08
- [Qemu-devel] [PULL 15/26] cryptodev: add vhost-user as a new cryptodev backend, Michael S. Tsirkin, 2018/02/08