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d7b14c5c04
PAPR does not specify that fwnmi sreset should be interlocked, and PowerVM (and therefore now QEMU) do not require it. These "ibm,nmi-interlock" calls are ignored by firmware, but there is a possibility that the sreset could have interrupted a machine check and release the machine check's interlock too early, corrupting it if another machine check came in. This is an extremely rare case, but it should be fixed for clarity and reducing the code executed in the sreset path. Firmware also does not provide error information for the sreset case to look at, so remove that comment. Signed-off-by: Nicholas Piggin <npiggin@gmail.com> [mpe: Use __be64 to silence some sparse warnings] Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/20200508043408.886394-9-npiggin@gmail.com |
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