On Sep 25, 2012, at 3:59 PM, Benjamin Herrenschmidt wrote:

On Tue, 2012-09-25 at 15:17 +0200, Segher Boessenkool wrote:

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Fine. But I believe that mfpvr emulation came first, which is the =20=

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point
I object to (see the mess that the fact that CPUID is available to
applications made to x86 when SSE registers were added).

=20
Heh, possibly, I don't remember... I added the cputable, I think we
added mfpvr because we didn't have anything, then I added cputable =20=

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which
got us the HW caps, but some old stuff still relied on mfpvr so we
couldn't completely remove it.

=20
If I have my history right end up, MFPVR emulation was added for MoL.
Which is funny (if you like that kind of thing) because it now hurts
all other "hypervisor in userspace" kind of things, that might want
to lie in their emulated PVR...

=20
Are you sure ? MOL had a kernel module, it wouldn't have needed =

that...

I feel like there was some JVMs (IBMs?) that used MFPVR to determine =
some things.

- k=