kvm: accept non-mapped memory in kvm_dirty_pages_log_change
It is okay if memory is not mapped into the guest but has dirty logging enabled. When this happens, KVM will not do anything and only accesses from the host will be logged. This can be triggered by iofuzz. Reviewed-by: NFam Zheng <famz@redhat.com> Signed-off-by: NPaolo Bonzini <pbonzini@redhat.com>
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