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2024-11-01 7e970c18f85f99acc678d90128b6e01dce1bf273

 kernel/arch/arm64/include/asm/mmu_context.h
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@@ -15,6 +15,7 @@
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 #include <linux/sched/hotplug.h>
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 #include <linux/mm_types.h>
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 #include <linux/pgtable.h>
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+#include <linux/irq_pipeline.h>
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 #include <asm/cacheflush.h>
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 #include <asm/cpufeature.h>
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@@ -112,6 +113,9 @@
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 static inline void cpu_uninstall_idmap(void)
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 {
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 	struct mm_struct *mm = current->active_mm;
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+	unsigned long flags;
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+
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+	flags = hard_cond_local_irq_save();
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 	cpu_set_reserved_ttbr0();
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 	local_flush_tlb_all();
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@@ -119,15 +123,23 @@
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 	if (mm != &init_mm && !system_uses_ttbr0_pan())
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 		cpu_switch_mm(mm->pgd, mm);
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+
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+	hard_cond_local_irq_restore(flags);
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 }
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 static inline void cpu_install_idmap(void)
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 {
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+	unsigned long flags;
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+
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+	flags = hard_cond_local_irq_save();
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+
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 	cpu_set_reserved_ttbr0();
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 	local_flush_tlb_all();
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 	cpu_set_idmap_tcr_t0sz();
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 	cpu_switch_mm(lm_alias(idmap_pg_dir), &init_mm);
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+
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+	hard_cond_local_irq_restore(flags);
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 }
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 /*
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@@ -230,7 +242,7 @@
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 }
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 static inline void
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-switch_mm(struct mm_struct *prev, struct mm_struct *next,
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+do_switch_mm(struct mm_struct *prev, struct mm_struct *next,
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 	  struct task_struct *tsk)
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 {
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 	if (prev != next)
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@@ -245,8 +257,26 @@
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 	update_saved_ttbr0(tsk, next);
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 }
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+static inline void
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+switch_mm(struct mm_struct *prev, struct mm_struct *next,
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+	  struct task_struct *tsk)
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+{
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+	unsigned long flags;
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+
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+	protect_inband_mm(flags);
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+	do_switch_mm(prev, next, tsk);
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+	unprotect_inband_mm(flags);
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+}
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+
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 #define deactivate_mm(tsk,mm)	do { } while (0)
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-#define activate_mm(prev,next)	switch_mm(prev, next, current)
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+#define activate_mm(prev,next)	do_switch_mm(prev, next, current)
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+
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+static inline void
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+switch_oob_mm(struct mm_struct *prev, struct mm_struct *next,
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+	      struct task_struct *tsk)
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+{
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+	do_switch_mm(prev, next, tsk);
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+}
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 static inline const struct cpumask *
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 task_cpu_possible_mask(struct task_struct *p)