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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>
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Marcelo Tosatti Avi Kivity
Marcelo Tosatti authored and Avi Kivity committed Aug 24, 2012
1 parent 2df72e9 commit 12d6e7538e2d418c08f082b1b44ffa5fb7270ed8
Showing with 3 additions and 3 deletions.
  1. +3 −3 virt/kvm/kvm_main.c
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@@ -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)

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