Re: [PATCH] powerpc: fix 32-bit KVM-PR lockup and panic with MacOS guest

On Fri, 2019-02-08 at 14:51 +0000, Mark Cave-Ayland wrote:

Indeed, but there are still some questions to be asked here:

1) Why were these bits removed from the original bitmask in the first place without
it being documented in the commit message?

2) Is this the right fix? I'm told that MacOS guests already run without this patch
on a G5 under 64-bit KVM-PR which may suggest that this is a workaround for another
bug elsewhere in the 32-bit powerpc code.


If you think that these points don't matter, then I'm happy to resubmit the patch
as-is based upon your comments above.

We should write a test case to verify that FE0/FE1 are properly
preserved/context-switched etc... I bet if we accidentally wiped them,
we wouldn't notice 99.9% of the time.

Cheers,
Ben.