Patch "KVM: perform an invalid memslot step for gpa base change" has been added to the 3.4-stable tree

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This is a note to let you know that I've just added the patch titled

    KVM: perform an invalid memslot step for gpa base change

to the 3.4-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     kvm-perform-an-invalid-memslot-step-for-gpa-base-change.patch
and it can be found in the queue-3.4 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.


>From 12d6e7538e2d418c08f082b1b44ffa5fb7270ed8 Mon Sep 17 00:00:00 2001
From: Marcelo Tosatti <mtosatti@xxxxxxxxxx>
Date: Fri, 24 Aug 2012 15:54:58 -0300
Subject: KVM: perform an invalid memslot step for gpa base change

From: Marcelo Tosatti <mtosatti@xxxxxxxxxx>

commit 12d6e7538e2d418c08f082b1b44ffa5fb7270ed8 upstream.

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

Signed-off-by: Marcelo Tosatti <mtosatti@xxxxxxxxxx>
Signed-off-by: Avi Kivity <avi@xxxxxxxxxx>
Cc: Luis Henriques <luis.henriques@xxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

---
 virt/kvm/kvm_main.c |    6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

--- a/virt/kvm/kvm_main.c
+++ b/virt/kvm/kvm_main.c
@@ -774,7 +774,7 @@ int __kvm_set_memory_region(struct kvm *
 		/* destroy any largepage mappings for dirty tracking */
 	}
 
-	if (!npages) {
+	if (!npages || base_gfn != old.base_gfn) {
 		struct kvm_memory_slot *slot;
 
 		r = -ENOMEM;
@@ -790,8 +790,8 @@ int __kvm_set_memory_region(struct 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)


Patches currently in stable-queue which might be from mtosatti@xxxxxxxxxx are

queue-3.4/kvm-perform-an-invalid-memslot-step-for-gpa-base-change.patch
queue-3.4/kvm-fix-iommu-map-unmap-to-handle-memory-slot-moves.patch
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