Messages in this thread | | | Date | Fri, 16 Jun 2023 13:57:59 -0700 | From | Ashok Raj <> | Subject | Re: [patch v3 1/7] x86/smp: Make stop_other_cpus() more robust |
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On Fri, Jun 16, 2023 at 08:01:56PM +0200, Thomas Gleixner wrote: > On Fri, Jun 16 2023 at 07:13, Ashok Raj wrote: > > On Fri, Jun 16, 2023 at 09:53:25AM +0200, Thomas Gleixner wrote: > >> > can we simplify this by just apic->send_IPI(cpu, NMI_VECTOR); ?? > >> > >> That would not set APIC_DM_NMI in delivery mode and the IPI would be > >> sent with APIC_DM_FIXED. > > > > That's correct. > > > > Maybe if we use apic->send_IPI_mask(cpumask_of(cpu), NMI_VECTOR) > > > > apic->send_IPI_mask(cpumask_of(cpu),NMI_VECTOR) > > __x2apic_send_IPI_mask() > > __x2apic_send_IPI_dest() > > unsigned long cfg = __prepare_ICR(0, vector, dest); > > native_x2apic_icr_write(cfg, apicid); > > > > __prepare_ICR() seems to have the magic for APIC_DM_NMI? > > Bah. I clearly neither can read nor can remember any of the internals of > that code: > > apic->send_IPI() > x2apic_send_IPI() > __x2apic_send_IPI_dest() > > It also works for all other APIC incarnations.
Works!
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