Re: [PATCH] powerpc/booke: Eliminate rfi from exception entry path.

On 07/10/2012 07:44 PM, Alexander Graf wrote:

On 11.07.2012, at 02:34, Scott Wood wrote:

quoted

+#ifdef CONFIG_BOOKE
+	/*
+	 * We're not changing address space on Book E, and the extra rfi
+	 * can hurt when virtualized without hardware support -- whereas
+	 * mtmsr can be paravirtualized.

We can always paravirtualize RFI as well if it makes sense.

I'm not sure that's possible.  We thought about it a while back, but
IIRC the difficulty was not leaving a register clobbered.

-Scott