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When the TDP MMU is allowed to handle page faults in parallel there is
the possiblity of a race where an SPTE is cleared and then imediately
replaced with a present SPTE pointing to a different PFN, before the
TLBs can be flushed. This race would violate architectural specs. Ensure
that the TLBs are flushed properly before other threads are allowed to
install any present value for the SPTE.
Reviewed-by: Peter Feiner <pfeiner@google.com>
Signed-off-by: Ben Gardon <bgardon@google.com>
Message-Id: <20210202185734.1680553-22-bgardon@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>