memory: differentiate memory_region_is_logging and memory_region_get_dirty_log_mask

For now memory regions only track DIRTY_MEMORY_VGA individually, but
this will change soon.  To support this, split memory_region_is_logging
in two functions: one that returns a given bit from dirty_log_mask,
and one that returns the entire mask.  memory_region_is_logging gets an
extra parameter so that the compiler flags misuse.

While VGA-specific users (including the Xen listener!) will want to keep
checking that bit, KVM and vhost check for "any bit except migration"
(because migration is handled via the global start/stop listener
callbacks).

Reviewed-by: Fam Zheng <famz@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

3 files changed, 4 insertions, 3 deletions

diff --git a/hw/display/vmware_vga.c b/hw/display/vmware_vga.c
index c17ddd1..7f397d3 100644
--- a/hw/display/vmware_vga.c
+++ b/hw/display/vmware_vga.c
@@ -1124,7 +1124,7 @@ static void vmsvga_update_display(void *opaque)
      * Is it more efficient to look at vram VGA-dirty bits or wait
      * for the driver to issue SVGA_CMD_UPDATE?
      */
-    if (memory_region_is_logging(&s->vga.vram)) {
+    if (memory_region_is_logging(&s->vga.vram, DIRTY_MEMORY_VGA)) {
         vga_sync_dirty_bitmap(&s->vga);
         dirty = memory_region_get_dirty(&s->vga.vram, 0,
             surface_stride(surface) * surface_height(surface),
diff --git a/hw/virtio/dataplane/vring.c b/hw/virtio/dataplane/vring.c
index 5c7b8c2..e378733 100644
--- a/hw/virtio/dataplane/vring.c
+++ b/hw/virtio/dataplane/vring.c
@@ -42,7 +42,7 @@ static void *vring_map(MemoryRegion **mr, hwaddr phys, hwaddr len,
     }
 
     /* Ignore regions with dirty logging, we cannot mark them dirty */
-    if (memory_region_is_logging(section.mr)) {
+    if (memory_region_get_dirty_log_mask(section.mr)) {
         goto out;
     }
 
diff --git a/hw/virtio/vhost.c b/hw/virtio/vhost.c
index 01f1e04..53d23d2 100644
--- a/hw/virtio/vhost.c
+++ b/hw/virtio/vhost.c
@@ -416,7 +416,8 @@ static void vhost_set_memory(MemoryListener *listener,
                                          memory_listener);
     hwaddr start_addr = section->offset_within_address_space;
     ram_addr_t size = int128_get64(section->size);
-    bool log_dirty = memory_region_is_logging(section->mr);
+    bool log_dirty =
+        memory_region_get_dirty_log_mask(section->mr) & ~(1 << DIRTY_MEMORY_MIGRATION);
     int s = offsetof(struct vhost_memory, regions) +
         (dev->mem->nregions + 1) * sizeof dev->mem->regions[0];
     void *ram;