On Wed, Sep 11, 2024 at 05:49:46PM +0200, Niels Dettenbach wrote: > Am Mittwoch, 11. September 2024, 10:53:30 schrieb Niels Dettenbach: > > virtual machines under Xen Hypervisor (DomU) running in Xen PV mode use a > > special, nonstandard synthetized CPU topology which "just works" under > > kernels 6.9.x while newer kernels assuming a "crash kernel" and disable > > SMT (reducing to one CPU core) because the newer topology implementation > > produces a wrong error "[Firmware Bug]: APIC enumeration order not > > specification compliant" after new topology checks which are improper for > > Xen PV platform. As a result, the kernel disables SMT and activates just > > one CPU core within the VM (DomU). > > > > The patch disables the regarding checks if it is running in Xen PV > > mode (only) and bring back SMT / all CPUs as in the past to such DomU > > VMs. > > > > Signed-off-by: Niels Dettenbach <nd@xxxxxxxxxxxx> > > > > Signed-off-by: Niels Dettenbach <nd@xxxxxxxxxxxx> > --- > > A reworked proposal patch which substitutes my initial proposed patch: > > > --- linux/arch/x86/kernel/cpu/topology.c 2024-09-11 17:42:42.699278317 +0200 > +++ linux/arch/x86/kernel/cpu/topology.c.orig 2024-09-11 09:53:16.194095250 +0200 <snip> Please submit this to the proper developers and maintainers for this code, as the get_maintainers script will tell you as the documentation states. As it is, this isn't going anywhere as you did not include them properly. good luck! greg k-h
