On Thu, Jan 22, 2026 at 03:21:56PM +0100, Borislav Petkov wrote:
> On Thu, Jan 22, 2026 at 10:15:43PM +0800, Hou Wenlong wrote:
> > The commit 1f60230cdc63 ("x86/smp: Use static_call for
> > arch_send_call_function_ipi()") changed to use a static call for
> > arch_send_call_function_ipi(), which causes two problems:
> >
> > First, the KVM guest also changes 'smp_ops.send_call_func_ipi' when the
> > PV sched yield feature is available. However, the missing
> > static_call_update() breaks the PV sched yield feature.
> >
> > Additionally, xen_smp_init() is called before static_call_init() during
> > the booting of the XENPV guest, which triggers a warning in
> > __static_call_update().
> >
> > To simplify, move the static call update for 'smp_ops' into
> > smp_prepare_boot_cpu() to address these two problems together.
> >
> > Fixes: 1f60230cdc63 ("x86/smp: Use static_call for
> > arch_send_call_function_ipi()")
> > Signed-off-by: Hou Wenlong <[email protected]>
> > ---
> > I'm not sure if the XEN part is okay or not. I think there should be no
> > IPI before smp_prepare_boot_cpu(), and even if there is, it's okay for
> > the KVM guest to use the native version before smp_prepare_boot_cpu().
>
> All three commits zapped from tip:x86/core.
>
> We can try again once this is resolved.
>
Get it, thanks!
> Thx.
>
> --
> Regards/Gruss,
> Boris.
>
> https://people.kernel.org/tglx/notes-about-netiquette
