On Wed, Jul 9, 2014 at 12:26 PM, Stefan Fritsch <s...@sfritsch.de> wrote:
> On Tuesday 08 July 2014 23:53:21, Mark Kettenis wrote: > ... > > If we're serious about supporting OpenBSD on (KVM) hypervisors, > > something like this makes sense. We tend to try and have a single > > kernel that runs on the widest range of hardware that is possible. > > For example the OpenBSD/sparc64 kernel runs on both sun4u and sun4v > > hardware, and the sun4v platforms has written paravirtualization all > > over it. There I successfully made use of code patching > > techniques. That might help on x86 as well. > > Yes, code patching may be useful. I haven't noticed it used in openbsd > before, but I will take a look at sparc64. > Code patching is used currently on i386 and amd64 for the SMAP support. Grep for _copyin_stac, for example. Philip
