tree 55acee5d8e3c51f09f44ccfcdd631590819b949d
parent 7a0eb1960e8ddcb68ea631caf16815485af0e228
author Marcelo Tosatti <mtosatti@redhat.com> 1228940606 +0100
committer Avi Kivity <avi@redhat.com> 1234658855 +0200

KVM: mmu_notifiers release method

The destructor for huge pages uses the backing inode for adjusting
hugetlbfs accounting.

Hugepage mappings are destroyed by exit_mmap, after
mmu_notifier_release, so there are no notifications through
unmap_hugepage_range at this point.

The hugetlbfs inode can be freed with pages backed by it referenced
by the shadow. When the shadow releases its reference, the huge page
destructor will access a now freed inode.

Implement the release operation for kvm mmu notifiers to release page
refs before the hugetlbfs inode is gone.

Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
Signed-off-by: Avi Kivity <avi@redhat.com>