On Tue, 2008-04-01 at 08:01 -0400, Jimi Xenidis wrote: > On Mar 31, 2008, at 11:15 PM, Josh Boyer wrote: > > > On Tue, 2008-04-01 at 12:04 +1100, Michael Ellerman wrote: > >>>>> I'm assuming you pass a dtb to the virtual guest when you start > >>>>> it up. > >>>>> Could you define a property in the CPU node there that can be > >>>>> parsed to > >>>>> use the power_save function instead of always making it the > >>>>> default? > >>>> > >>>> Actually, you probably don't want this as a property in the device > >>>> tree. It doesn't describe hardware. A Kconfig option might be > >>>> warranted though. > >>> > >>> I'll go with the Kconfig option. > >> > >> Go with a device-tree check. The pseries kernel supports both bare- > >> metal > >> and hypervisor in the same kernel image, and it works out which it's > >> running on by looking at the device-tree. This seems equivalent to > >> me? > > > > After some back and forth on IRC, we decided on that as well. I love > > being right, then wrong, then right again. > > Awesome, can you summarize for the rest of us?
A node or property will be in the device tree that the guests can use to determine if it's running under a hypervisor or not. The details are yet to be worked out, so there isn't much more of a summary yet. There was also some conversation about having an "idle=" kernel parameter similar to the PA-Semi port that would allow toggling of it as well. josh _______________________________________________ Linuxppc-dev mailing list Linuxppc-dev@ozlabs.org https://ozlabs.org/mailman/listinfo/linuxppc-dev
