On 28.06.2010, at 10:15, Avi Kivity wrote:

On 06/28/2010 09:33 AM, Alexander Graf wrote:

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=20

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Could you do something similar in module_finalize() to patch loaded =

modules' .text sections?

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   =20

I could, but do we need it? I objdump -d | grep'ed all my modules and =

didn't find any need to do so.

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You mean even kvm.ko doesn't use privileged instructions?

It does, but I don't think it's worth speeding those up. There are only =
a couple. Most of the privileged instructions in PPC KVM are statically =
compiled into the kernel because we need to guarantee they're in the RMO =
(first 8MB for the PS3).

Even with the magic page in use, trapping instructions still works =
exactly as before, so we're only talking about a speed difference.


Alex