From b43b1901ad282aeb74161837fb403927102687a1 Mon Sep 17 00:00:00 2001 From: Marcelo Tosatti Date: Tue, 12 May 2009 18:55:44 -0300 Subject: [PATCH] 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 Signed-off-by: Avi Kivity --- virt/kvm/kvm_main.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c index 687d113a3e5e..5fed9bfc3cf5 100644 --- a/virt/kvm/kvm_main.c +++ b/virt/kvm/kvm_main.c @@ -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); -- GitLab