From: Sumit Garg <sumit.garg@linaro.org> maillist inclusion category: feature bugzilla: 49593 CVE: NA Reference: https://www.spinics.net/lists/arm-kernel/msg851005.html ------------------------------------------------- Assign an unused IPI which can be turned as NMI using ipi_nmi framework. Also, invoke corresponding dynamic IPI setup/teardown APIs. Signed-off-by: Sumit Garg <sumit.garg@linaro.org> Signed-off-by: Wei Li <liwei391@huawei.com> Reviewed-by: Xie XiuQi <xiexiuqi@huawei.com> Signed-off-by: Zheng Zengkai <zhengzengkai@huawei.com> Signed-off-by: Ruan Jinjie <ruanjinjie@huawei.com> --- arch/arm64/kernel/smp.c | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/arch/arm64/kernel/smp.c b/arch/arm64/kernel/smp.c index d00d4cbb31b1..0449a8a1627d 100644 --- a/arch/arm64/kernel/smp.c +++ b/arch/arm64/kernel/smp.c @@ -43,6 +43,7 @@ #include <asm/daifflags.h> #include <asm/kvm_mmu.h> #include <asm/mmu_context.h> +#include <asm/nmi.h> #include <asm/numa.h> #include <asm/processor.h> #include <asm/smp_plat.h> @@ -939,6 +940,8 @@ static void ipi_setup(int cpu) for (i = 0; i < nr_ipi; i++) enable_percpu_irq(ipi_irq_base + i, 0); + + dynamic_ipi_setup(cpu); } #ifdef CONFIG_HOTPLUG_CPU @@ -951,6 +954,8 @@ static void ipi_teardown(int cpu) for (i = 0; i < nr_ipi; i++) disable_percpu_irq(ipi_irq_base + i); + + dynamic_ipi_teardown(cpu); } #endif @@ -972,6 +977,9 @@ void __init set_smp_ipi_range(int ipi_base, int n) irq_set_status_flags(ipi_base + i, IRQ_HIDDEN); } + if (n > nr_ipi) + set_smp_dynamic_ipi(ipi_base + nr_ipi); + ipi_irq_base = ipi_base; /* Setup the boot CPU immediately */ -- 2.34.1