[Qemu-devel] [PATCH] kvm: Don't walk memory_size == 0 slots in kvm_client_migration_log

[Alex Williamson <alex.williamson@redhat.com>]

If we've unregistered a memory area, we should avoid calling
qemu_get_ram_ptr() on the left over phys_offset cruft in the
slot array.  Now that we support removing ramblocks, the
phys_offset ram_addr_t can go away and cause a lookup fault
and abort.

Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
---

 kvm-all.c |    3 +++
 1 files changed, 3 insertions(+), 0 deletions(-)

diff --git a/kvm-all.c b/kvm-all.c
index fec6d05..2922292 100644
--- a/kvm-all.c
+++ b/kvm-all.c
@@ -282,6 +282,9 @@ static int kvm_set_migration_log(int enable)
     for (i = 0; i < ARRAY_SIZE(s->slots); i++) {
         mem = &s->slots[i];
 
+        if (!mem->memory_size) {
+            continue;
+        }
         if (!!(mem->flags & KVM_MEM_LOG_DIRTY_PAGES) == enable) {
             continue;
         }