On 30.05.14 17:55, Paolo Bonzini wrote:
Il 30/05/2014 17:53, Alexander Graf ha scritto:
This is an ABI break, this symbol was added in 3.14. I think I should
revert this. Can you convince me otherwise?
There's nothing bad happening with the change. Newer user space won't be
able to read WORT on older kernels, but there were more things broken
that just WORT for POWER8 support there ;).
And user space build with new headers running on an old kernel won't
find the register, which is OK.
Would new userspace with old kernel be able to detect that POWER8
support isn't quite complete?
It couldn't, no. It would try to run a guest - if it happens to work
we're lucky ;). Even then the only thing that would remotely be affected
by that one_reg rename is live migration (which just got a few more
fixes in this pull request).
Alex
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