If the helper is defined, it is called instead of halt() to stop the CPU at the end of stop_this_cpu() and on crash CPU shutdown.
ACPI MADT will use it to hand over the CPU to BIOS in order to be able to wake it up again after kexec. Signed-off-by: Kirill A. Shutemov <[email protected]> --- arch/x86/include/asm/smp.h | 1 + arch/x86/kernel/process.c | 20 +++++++++++++------- arch/x86/kernel/reboot.c | 12 ++++++++---- 3 files changed, 22 insertions(+), 11 deletions(-) diff --git a/arch/x86/include/asm/smp.h b/arch/x86/include/asm/smp.h index 4fab2ed454f3..390d53fd34f9 100644 --- a/arch/x86/include/asm/smp.h +++ b/arch/x86/include/asm/smp.h @@ -38,6 +38,7 @@ struct smp_ops { int (*cpu_disable)(void); void (*cpu_die)(unsigned int cpu); void (*play_dead)(void); + void (*stop_this_cpu)(void); void (*send_call_func_ipi)(const struct cpumask *mask); void (*send_call_func_single_ipi)(int cpu); diff --git a/arch/x86/kernel/process.c b/arch/x86/kernel/process.c index b6f4e8399fca..65c7971defd2 100644 --- a/arch/x86/kernel/process.c +++ b/arch/x86/kernel/process.c @@ -835,13 +835,19 @@ void __noreturn stop_this_cpu(void *dummy) */ cpumask_clear_cpu(cpu, &cpus_stop_mask); - for (;;) { - /* - * Use native_halt() so that memory contents don't change - * (stack usage and variables) after possibly issuing the - * native_wbinvd() above. - */ - native_halt(); + if (smp_ops.stop_this_cpu) { + smp_ops.stop_this_cpu(); + unreachable(); + } else { + + for (;;) { + /* + * Use native_halt() so that memory contents don't + * change (stack usage and variables) after possibly + * issuing the native_wbinvd() above. + */ + native_halt(); + } } } diff --git a/arch/x86/kernel/reboot.c b/arch/x86/kernel/reboot.c index 16dde83df49a..738b3e810196 100644 --- a/arch/x86/kernel/reboot.c +++ b/arch/x86/kernel/reboot.c @@ -881,10 +881,14 @@ static int crash_nmi_callback(unsigned int val, struct pt_regs *regs) cpu_emergency_disable_virtualization(); atomic_dec(&waiting_for_crash_ipi); - /* Assume hlt works */ - halt(); - for (;;) - cpu_relax(); + + if (smp_ops.stop_this_cpu) { + smp_ops.stop_this_cpu(); + } else { + halt(); + for (;;) + cpu_relax(); + } return NMI_HANDLED; } -- 2.41.0 _______________________________________________ kexec mailing list [email protected] http://lists.infradead.org/mailman/listinfo/kexec
