On Fri, 10 Aug 2018 02:01:00 +0300 "Michael S. Tsirkin" <m...@redhat.com> wrote:
> On Thu, Aug 09, 2018 at 12:00:11PM +0200, Igor Mammedov wrote: > > On Wed, 8 Aug 2018 23:17:48 +0300 > > "Michael S. Tsirkin" <m...@redhat.com> wrote: > > > > > On Wed, Aug 08, 2018 at 05:15:48PM +0200, Igor Mammedov wrote: > > > > Reuse CPU hotplug IO registers for passing a CST entry > > > > containing package for shalowest C1 using mwait and > > > > read it out in guest with new CCST AML method. > > > > > > I don't see how 1 entry is enough. We need to describe full _CST package > > > so > > > that guest can do reasonable power management on the CPU. > > I was assuming that CST are to be used for mwait/monitor idle combo > > to help reduce latencies/vmexits on cpus wakeup from idle state, hence 1 > > entry. > > It's trivial to add as much as needed entries though. > > If you are fine with approach I can respin patch with arbitrary > > number of CStates. > > You will find that the code then becomes very messy, and > dynamic size of the package is one of the things > that makes it messy. it turned up like extra ~10LOC, for a loop based impl. I'll post amended patch here as reply with full update series in my repo. > > > > > The CState support is optional and could be turned on > > > > with '-global PIIX4_PM.cstate=on' CLI option. > > > > > > > > Signed-off-by: Igor Mammedov <imamm...@redhat.com> > > > > --- > > [...]
