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KVM: take mmu_lock when updating a deleted slot 

kvm_handle_hva relies on mmu_lock protection to safely access
the memslot structures.

Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
This commit is contained in:
Marcelo Tosatti 2009-05-12 18:55:44 -03:00 committed by Avi Kivity
parent 7c8a83b75a
commit b43b1901ad
1 changed files with 2 additions and 0 deletions
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2
virt/kvm/kvm_main.c
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@ -1210,8 +1210,10 @@ int __kvm_set_memory_region(struct kvm *kvm,
kvm_free_physmem_slot(&old, npages ? &new : NULL);
/* Slot deletion case: we have to update the current slot */
spin_lock(&kvm->mmu_lock);
if (!npages)
*memslot = old;
spin_unlock(&kvm->mmu_lock);
#ifdef CONFIG_DMAR
/* map the pages in iommu page table */
r = kvm_iommu_map_pages(kvm, base_gfn, npages);