[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: [PATCH] x86/smp: Factor out parts of native_smp_prepare_cpus()
On Tue, Nov 02, 2021 at 07:36:36PM -0400, Boris Ostrovsky wrote: > Commit 66558b730f25 ("sched: Add cluster scheduler level for x86") > introduced cpu_l2c_shared_map mask which is expected to be initialized > by smp_op.smp_prepare_cpus(). That commit only updated > native_smp_prepare_cpus() version but not xen_pv_smp_prepare_cpus(). > As result Xen PV guests crash in set_cpu_sibling_map(). > > While the new mask can be allocated in xen_pv_smp_prepare_cpus() one can > see that both versions of smp_prepare_cpus ops share a number of common > operations that can be factored out. So do that instead. > > Fixes: 66558b730f25 ("sched: Add cluster scheduler level for x86") > Signed-off-by: Boris Ostrovsky <boris.ostrovsky@xxxxxxxxxx> Thanks! I'll go stick that somewhere /urgent (I've had another report on that here: https://lkml.kernel.org/r/20211105074139.GE174703@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx ) But looking at those functions; there seems to be more spurious differences. For example, the whole sched_topology thing. Should we re-architect this whole smp_prepare_cpus() thing instead? Have a common function and a guest function? HyperV for instance seems to call native_smp_prepare_cpus() and then does something extra (as does xen_hvm).
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