Merge tag 'x86_paravirt_for_v6.4_rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

Pull x86 paravirt updates from Borislav Petkov:

 - Convert a couple of paravirt callbacks to asm to prevent
   '-fzero-call-used-regs' builds from zeroing live registers because
   paravirt hides the CALLs from the compiler so latter doesn't know
   there's a CALL in the first place

 - Merge two paravirt callbacks into one, as their functionality is
   identical

* tag 'x86_paravirt_for_v6.4_rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  x86/paravirt: Convert simple paravirt functions to asm
  x86/paravirt: Merge activate_mm() and dup_mmap() callbacks

3 files changed, 14 insertions, 26 deletions

diff --git a/arch/x86/include/asm/mmu_context.h b/arch/x86/include/asm/mmu_context.h
index e01aa74a6de7..c3ad8a526378 100644
--- a/arch/x86/include/asm/mmu_context.h
+++ b/arch/x86/include/asm/mmu_context.h
@@ -16,13 +16,6 @@
 
 extern atomic64_t last_mm_ctx_id;
 
-#ifndef CONFIG_PARAVIRT_XXL
-static inline void paravirt_activate_mm(struct mm_struct *prev,
-					struct mm_struct *next)
-{
-}
-#endif	/* !CONFIG_PARAVIRT_XXL */
-
 #ifdef CONFIG_PERF_EVENTS
 DECLARE_STATIC_KEY_FALSE(rdpmc_never_available_key);
 DECLARE_STATIC_KEY_FALSE(rdpmc_always_available_key);
@@ -135,7 +128,7 @@ extern void switch_mm_irqs_off(struct mm_struct *prev, struct mm_struct *next,
 
 #define activate_mm(prev, next)			\
 do {						\
-	paravirt_activate_mm((prev), (next));	\
+	paravirt_enter_mmap(next);		\
 	switch_mm((prev), (next), NULL);	\
 } while (0);
 
@@ -168,7 +161,7 @@ static inline void arch_dup_pkeys(struct mm_struct *oldmm,
 static inline int arch_dup_mmap(struct mm_struct *oldmm, struct mm_struct *mm)
 {
 	arch_dup_pkeys(oldmm, mm);
-	paravirt_arch_dup_mmap(oldmm, mm);
+	paravirt_enter_mmap(mm);
 	return ldt_dup_context(oldmm, mm);
 }
 
diff --git a/arch/x86/include/asm/paravirt.h b/arch/x86/include/asm/paravirt.h
index cf40e813b3d7..b49778664d2b 100644
--- a/arch/x86/include/asm/paravirt.h
+++ b/arch/x86/include/asm/paravirt.h
@@ -334,16 +334,9 @@ static inline void tss_update_io_bitmap(void)
 }
 #endif
 
-static inline void paravirt_activate_mm(struct mm_struct *prev,
-					struct mm_struct *next)
+static inline void paravirt_enter_mmap(struct mm_struct *next)
 {
-	PVOP_VCALL2(mmu.activate_mm, prev, next);
-}
-
-static inline void paravirt_arch_dup_mmap(struct mm_struct *oldmm,
-					  struct mm_struct *mm)
-{
-	PVOP_VCALL2(mmu.dup_mmap, oldmm, mm);
+	PVOP_VCALL1(mmu.enter_mmap, next);
 }
 
 static inline int paravirt_pgd_alloc(struct mm_struct *mm)
@@ -789,8 +782,7 @@ extern void default_banner(void);
 
 #ifndef __ASSEMBLY__
 #ifndef CONFIG_PARAVIRT_XXL
-static inline void paravirt_arch_dup_mmap(struct mm_struct *oldmm,
-					  struct mm_struct *mm)
+static inline void paravirt_enter_mmap(struct mm_struct *mm)
 {
 }
 #endif
diff --git a/arch/x86/include/asm/paravirt_types.h b/arch/x86/include/asm/paravirt_types.h
index 8c1da419260f..4acbcddddc29 100644
--- a/arch/x86/include/asm/paravirt_types.h
+++ b/arch/x86/include/asm/paravirt_types.h
@@ -164,11 +164,8 @@ struct pv_mmu_ops {
 	unsigned long (*read_cr3)(void);
 	void (*write_cr3)(unsigned long);
 
-	/* Hooks for intercepting the creation/use of an mm_struct. */
-	void (*activate_mm)(struct mm_struct *prev,
-			    struct mm_struct *next);
-	void (*dup_mmap)(struct mm_struct *oldmm,
-			 struct mm_struct *mm);
+	/* Hook for intercepting the creation/use of an mm_struct. */
+	void (*enter_mmap)(struct mm_struct *mm);
 
 	/* Hooks for allocating and freeing a pagetable top-level */
 	int  (*pgd_alloc)(struct mm_struct *mm);
@@ -562,8 +559,14 @@ void paravirt_flush_lazy_mmu(void);
 
 void _paravirt_nop(void);
 void paravirt_BUG(void);
-u64 _paravirt_ident_64(u64);
 unsigned long paravirt_ret0(void);
+#ifdef CONFIG_PARAVIRT_XXL
+u64 _paravirt_ident_64(u64);
+unsigned long pv_native_save_fl(void);
+void pv_native_irq_disable(void);
+void pv_native_irq_enable(void);
+unsigned long pv_native_read_cr2(void);
+#endif
 
 #define paravirt_nop	((void *)_paravirt_nop)