KVM: perform an invalid memslot step for gpa base change

PPC must flush all translations before the new memory slot
is visible.

Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
Signed-off-by: Avi Kivity <avi@redhat.com>

1 files changed, 3 insertions, 3 deletions

diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
index a4bf05be5fea..f41ea1262d51 100644
--- a/virt/kvm/kvm_main.c
+++ b/virt/kvm/kvm_main.c
@@ -791,7 +791,7 @@ int __kvm_set_memory_region(struct kvm *kvm,
                 /* destroy any largepage mappings for dirty tracking */
         }
 
-        if (!npages) {
+        if (!npages || base_gfn != old.base_gfn) {
                 struct kvm_memory_slot *slot;
 
                 r = -ENOMEM;
@@ -807,8 +807,8 @@ int __kvm_set_memory_region(struct kvm *kvm,
                 old_memslots = kvm->memslots;
                 rcu_assign_pointer(kvm->memslots, slots);
                 synchronize_srcu_expedited(&kvm->srcu);
-                /* From this point no new shadow pages pointing to a deleted
-                 * memslot will be created.
+                /* From this point no new shadow pages pointing to a deleted,
+                 * or moved, memslot will be created.
                  *
                  * validation of sp->gfn happens in:
                  *      - gfn_to_hva (kvm_read_guest, gfn_to_pfn)