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x86/smp: Don't send INIT to boot CPU

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Parking CPUs in INIT works well, except for the crash case when the CPU
which invokes smp_park_other_cpus_in_init() is not the boot CPU. Sending
INIT to the boot CPU resets the whole machine.

Prevent this by validating that this runs on the boot CPU. If not fall back
and let CPUs hang in HLT.

Fixes: 45e34c8af5 ("x86/smp: Put CPUs into INIT on shutdown if possible")
Reported-by: Baokun Li <libaokun1@huawei.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Tested-by: Baokun Li <libaokun1@huawei.com>
Link: https://lore.kernel.org/r/87ttui91jo.ffs@tglx
This commit is contained in:
Thomas Gleixner 2023-07-05 10:59:23 +02:00
parent 45e34c8af5
commit b1472a60a5
1 changed files with 8 additions and 0 deletions
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8
arch/x86/kernel/smpboot.c
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@ -1473,6 +1473,14 @@ bool smp_park_other_cpus_in_init(void)
if (apic->wakeup_secondary_cpu_64 || apic->wakeup_secondary_cpu)
return false;
/*
* If this is a crash stop which does not execute on the boot CPU,
* then this cannot use the INIT mechanism because INIT to the boot
* CPU will reset the machine.
*/
if (this_cpu)
return false;
for_each_present_cpu(cpu) {
if (cpu == this_cpu)
continue;