Commit 6a1cb5f5 authored by Thomas Gleixner's avatar Thomas Gleixner
Browse files

x86/apic: Add static key to Control IPI shorthands 



The IPI shorthand functionality delivers IPI/NMI broadcasts to all CPUs in
the system. This can have similar side effects as the MCE broadcasting when
CPUs are waiting in the BIOS or are offlined.

The kernel tracks already the state of offlined CPUs whether they have been
brought up at least once so that the CR4 MCE bit is set to make sure that
MCE broadcasts can't brick the machine.

Utilize that information and compare it to the cpu_present_mask. If all
present CPUs have been brought up at least once then the broadcast side
effect is mitigated by disabling regular interrupt/IPI delivery in the APIC
itself and by the cpu offline check at the begin of the NMI handler.

Use a static key to switch between broadcasting via shorthands or sending
the IPI/NMI one by one.

Signed-off-by: default avatarThomas Gleixner <tglx@linutronix.de>
Acked-by: default avatarPeter Zijlstra (Intel) <peterz@infradead.org>
Link: https://lkml.kernel.org/r/20190722105220.386410643@linutronix.de
parent bdda3b93

arch/x86/include/asm/apic.h

+2 −0
Original line number Diff line number Diff line
@@ -505,8 +505,10 @@ extern int default_check_phys_apicid_present(int phys_apicid); 


#ifdef CONFIG_SMP

bool apic_id_is_primary_thread(unsigned int id);

void apic_smt_update(void);

#else

static inline bool apic_id_is_primary_thread(unsigned int id) { return false; }

static inline void apic_smt_update(void) { }

#endif



extern void irq_enter(void);

arch/x86/kernel/apic/ipi.c

+23 −1
Original line number Diff line number Diff line
@@ -5,6 +5,8 @@ 


#include "local.h"



DEFINE_STATIC_KEY_FALSE(apic_use_ipi_shorthand);



#ifdef CONFIG_SMP

#ifdef CONFIG_HOTPLUG_CPU

#define DEFAULT_SEND_IPI	(1)
@@ -28,7 +30,27 @@ static int __init print_ipi_mode(void) 
	return 0;

}

late_initcall(print_ipi_mode);

#endif



void apic_smt_update(void)

{

	/*

	 * Do not switch to broadcast mode if:

	 * - Disabled on the command line

	 * - Only a single CPU is online

	 * - Not all present CPUs have been at least booted once

	 *

	 * The latter is important as the local APIC might be in some

	 * random state and a broadcast might cause havoc. That's

	 * especially true for NMI broadcasting.

	 */

	if (apic_ipi_shorthand_off || num_online_cpus() == 1 ||

	    !cpumask_equal(cpu_present_mask, &cpus_booted_once_mask)) {

		static_branch_disable(&apic_use_ipi_shorthand);

	} else {

		static_branch_enable(&apic_use_ipi_shorthand);

	}

}

#endif /* CONFIG_SMP */



static inline int __prepare_ICR2(unsigned int mask)

{

arch/x86/kernel/apic/local.h

+6 −0
Original line number Diff line number Diff line
@@ -7,6 +7,9 @@ 
 * (c) 1998-99, 2000 Ingo Molnar <mingo@redhat.com>

 * (c) 2002,2003 Andi Kleen, SuSE Labs.

 */



#include <linux/jump_label.h>



#include <asm/apic.h>



/* APIC flat 64 */
@@ -22,6 +25,9 @@ int x2apic_phys_pkg_id(int initial_apicid, int index_msb); 
void x2apic_send_IPI_self(int vector);



/* IPI */



DECLARE_STATIC_KEY_FALSE(apic_use_ipi_shorthand);



static inline unsigned int __prepare_ICR(unsigned int shortcut, int vector,

					 unsigned int dest)

{

arch/x86/kernel/cpu/common.c

+2 −0
Original line number Diff line number Diff line
@@ -1953,4 +1953,6 @@ void arch_smt_update(void) 
{

	/* Handle the speculative execution misfeatures */

	cpu_bugs_smt_update();

	/* Check whether IPI broadcasting can be enabled */

	apic_smt_update();

}

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