KVM: MMU: drop read-only large sptes when creating lower level sptes
Read-only large sptes can be created due to read-only faults as follows: - QEMU pagetable entry that maps guest memory is read-only due to COW. - Guest read faults such memory, COW is not broken, because it is a read-only fault. - Enable dirty logging, large spte not nuked because it is read-only. - Write-fault on such memory causes guest to loop endlessly (which must go down to level 1 because dirty logging is enabled). Fix by dropping large spte when necessary. Signed-off-by:Marcelo Tosatti <mtosatti@redhat.com> Signed-off-by:
Paolo Bonzini <pbonzini@redhat.com>
parent
6d0abeca
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