# Re: \[Qemu-ppc\] \[RFC PATCH 12/17\] PowerPC: booke64: Add DO\_KVM kernel hooks

- From: Benjamin Herrenschmidt \<benh@kernel.crashing.org\>
- Date: 2012-07-11 22:28:13 
- List: linuxppc-dev
- Page: https://ratatoskr.run/linuxppc-dev/2012/07/9470203
- Thread: https://ratatoskr.run/linuxppc-dev/2012/06/9469817/t.md

```text
On Thu, 2012-07-12 at 00:25 +0200, Alexander Graf wrote:
> Or just free up another register early on, like here.

If you're going to do that, you want to measure the impact on null
syscall performance though.

Cheers,
Ben.
```