Re: [PATCH 3/3] KVM: PPC: Book3S: Add support for hwrng found onsome powernv systems

[Benjamin Herrenschmidt]

On Wed, 2013-10-02 at 11:11 +0200, Alexander Graf wrote:

> Right, and the difference for the patch in question is really whether
> we handle in in kernel virtual mode or in QEMU, so the bulk of the
> overhead (kicking threads out of  guest context, switching MMU
> context, etc) happens either way.
> 
> So the additional overhead when handling it in QEMU here really boils
> down to the user space roundtrip (plus another random number read
> roundtrip).

Hrm, Michael had a real mode version ... not sure where it went then.

Cheers,
Ben.


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