powerpc/64s/exception: Fix performance monitor virt handler
The perf virt handler uses EXCEPTION_PROLOG_2_REAL rather than _VIRT. In practice this is okay because the _REAL variant is usable by virt mode interrupts, but should be fixed (and is a performance win). Signed-off-by: NNicholas Piggin <npiggin@gmail.com> Signed-off-by: NMichael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/20190802105709.27696-21-npiggin@gmail.com
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