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x86/mm: Add global ASID process exit helpers

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A global ASID is allocated for the lifetime of a process. Free the global ASID
at process exit time.

  [ bp: Massage, create helpers, hide details inside them. ]

Signed-off-by: Rik van Riel <riel@surriel.com>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Link: https://lore.kernel.org/r/20250226030129.530345-10-riel@surriel.com
This commit is contained in:
Rik van Riel
2025-02-25 22:00:44 -05:00
committed by Ingo Molnar
parent be88a1dd61
commit c9826613a9
2 changed files with 16 additions and 1 deletions
Download Patch File Download Diff File Expand all files Collapse all files
arch/x86/include/asm/mmu_context.h
+7 -1
View File
@@ -2,7 +2,6 @@
#ifndef _ASM_X86_MMU_CONTEXT_H
#define _ASM_X86_MMU_CONTEXT_H
#include <asm/desc.h>
#include <linux/atomic.h>
#include <linux/mm_types.h>
#include <linux/pkeys.h>
@@ -13,6 +12,7 @@
#include <asm/paravirt.h>
#include <asm/debugreg.h>
#include <asm/gsseg.h>
#include <asm/desc.h>
extern atomic64_t last_mm_ctx_id;
@@ -139,6 +139,9 @@ static inline void mm_reset_untag_mask(struct mm_struct *mm)
#define enter_lazy_tlb enter_lazy_tlb
extern void enter_lazy_tlb(struct mm_struct *mm, struct task_struct *tsk);
#define mm_init_global_asid mm_init_global_asid
extern void mm_init_global_asid(struct mm_struct *mm);
extern void mm_free_global_asid(struct mm_struct *mm);
/*
@@ -163,6 +166,8 @@ static inline int init_new_context(struct task_struct *tsk,
mm->context.execute_only_pkey = -1;
}
#endif
mm_init_global_asid(mm);
mm_reset_untag_mask(mm);
init_new_context_ldt(mm);
return 0;
@@ -172,6 +177,7 @@ static inline int init_new_context(struct task_struct *tsk,
static inline void destroy_context(struct mm_struct *mm)
{
destroy_context_ldt(mm);
mm_free_global_asid(mm);
}
extern void switch_mm(struct mm_struct *prev, struct mm_struct *next,
arch/x86/include/asm/tlbflush.h
+9
View File
@@ -261,6 +261,14 @@ static inline u16 mm_global_asid(struct mm_struct *mm)
return asid;
}
static inline void mm_init_global_asid(struct mm_struct *mm)
{
if (cpu_feature_enabled(X86_FEATURE_INVLPGB)) {
mm->context.global_asid = 0;
mm->context.asid_transition = false;
}
}
static inline void mm_assign_global_asid(struct mm_struct *mm, u16 asid)
{
/*
@@ -281,6 +289,7 @@ static inline bool mm_in_asid_transition(struct mm_struct *mm)
}
#else
static inline u16 mm_global_asid(struct mm_struct *mm) { return 0; }
static inline void mm_init_global_asid(struct mm_struct *mm) { }
static inline void mm_assign_global_asid(struct mm_struct *mm, u16 asid) { }
static inline bool mm_in_asid_transition(struct mm_struct *mm) { return false; }
#endif /* CONFIG_BROADCAST_TLB_FLUSH */