Hi Julien, > On 21 Mar 2022, at 18:44, Julien Grall <jul...@xen.org> wrote: > > Hi Bertrand, > > On 21/03/2022 17:19, Bertrand Marquis wrote: >>> On 21 Mar 2022, at 17:36, Julien Grall <jul...@xen.org> wrote: >>>> So I don’t know why on x86 we must have cpu0 in cpupool0, maybe x86 >>>> maintainer have more knowledge about that and >>>> I can put a comment here. >>> >>> On Arm, we are not yet supporting all the CPU features that x86 supports >>> (e.g. CPU hotplug, suspend/resume...). So I a am bit concerned that the >>> restriction is just not there yet (or possibly hidden). >>> >>> Therefore, before lifting the restriction on Arm (and other arch), I would >>> like us to understand why it is necessary on x86. >>> >>> We may not have the answer quickly, so is it going to be a problem to keep >>> the restriction on Arm? >> I am ok to keep the limitation to have dom0 always running on cpu0. >> Only limitation I can see is that on a big little system, dom0 needs to stay >> on the type of core of the first booted core. > > Where does this limitation come from?
If dom0 must run on core0 and core0 is Little then you cannot build a system where dom0 is running on big cores. If the limitation is not there, you can build such a configuration without any dependency to the boot core type. Cheers Bertrand > > Cheers, > > -- > Julien Grall
