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KVM: Really remove a slot when a user ask us so 

Right now, KVM does not remove a slot when we do a
register ioctl for size 0 (would be the expected behaviour).

Instead, we only mark it as empty, but keep all bitmaps
and allocated data structures present. It completely
nullifies our chances of reusing that same slot again
for mapping a different piece of memory.

In this patch, we destroy rmaps, and vfree() the
pointers that used to hold the dirty bitmap, rmap
and lpage_info structures.

Signed-off-by: Glauber Costa <glommer@redhat.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
This commit is contained in:
Glauber Costa 2008-12-03 13:40:51 -02:00 committed by Avi Kivity
parent 7b7015914b
commit 6f89724829
1 changed files with 4 additions and 1 deletions
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5
virt/kvm/kvm_main.c
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@ -1020,7 +1020,10 @@ int __kvm_set_memory_region(struct kvm *kvm,
goto out_free;
}
kvm_free_physmem_slot(&old, &new);
kvm_free_physmem_slot(&old, npages ? &new : NULL);
/* Slot deletion case: we have to update the current slot */
if (!npages)
*memslot = old;
#ifdef CONFIG_DMAR
/* map the pages in iommu page table */
r = kvm_iommu_map_pages(kvm, base_gfn, npages);