With huge number of PCI devices in the system (for example, 200
virtio-blk-pci), this unconditional call can slow down emulation of
irrelevant PCI operations drastically, such as a BAR update on a device
that has no coalescing region. So avoid it.
Signed-off-by: Fam Zheng <famz@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
void memory_region_clear_coalescing(MemoryRegion *mr)
{
CoalescedMemoryRange *cmr;
+ bool updated = false;
qemu_flush_coalesced_mmio_buffer();
mr->flush_coalesced_mmio = false;
cmr = QTAILQ_FIRST(&mr->coalesced);
QTAILQ_REMOVE(&mr->coalesced, cmr, link);
g_free(cmr);
+ updated = true;
+ }
+
+ if (updated) {
+ memory_region_update_coalesced_range(mr);
}
- memory_region_update_coalesced_range(mr);
}
void memory_region_set_flush_coalesced(MemoryRegion *mr)