From d6dd61c831226f9cd7750885da04d360d6455101 Mon Sep 17 00:00:00 2001 From: Jeremy Fitzhardinge Date: Wed, 2 May 2007 19:27:14 +0200 Subject: [PATCH] x86: PARAVIRT: add hooks to intercept mm creation and destruction Add hooks to allow a paravirt implementation to track the lifetime of an mm. Paravirtualization requires three hooks, but only two are needed in common code. They are: arch_dup_mmap, which is called when a new mmap is created at fork arch_exit_mmap, which is called when the last process reference to an mm is dropped, which typically happens on exit and exec. The third hook is activate_mm, which is called from the arch-specific activate_mm() macro/function, and so doesn't need stub versions for other architectures. It's called when an mm is first used. Signed-off-by: Jeremy Fitzhardinge Signed-off-by: Andi Kleen Cc: linux-arch@vger.kernel.org Cc: James Bottomley Acked-by: Ingo Molnar --- include/asm-i386/mmu_context.h | 17 +++++++++++++++-- include/asm-i386/paravirt.h | 23 +++++++++++++++++++++++ 2 files changed, 38 insertions(+), 2 deletions(-) (limited to 'include/asm-i386') diff --git a/include/asm-i386/mmu_context.h b/include/asm-i386/mmu_context.h index e6aa30f8de5..8198d1cca1f 100644 --- a/include/asm-i386/mmu_context.h +++ b/include/asm-i386/mmu_context.h @@ -5,6 +5,16 @@ #include #include #include +#include +#ifndef CONFIG_PARAVIRT +#include + +static inline void paravirt_activate_mm(struct mm_struct *prev, + struct mm_struct *next) +{ +} +#endif /* !CONFIG_PARAVIRT */ + /* * Used for LDT copy/destruction. @@ -65,7 +75,10 @@ static inline void switch_mm(struct mm_struct *prev, #define deactivate_mm(tsk, mm) \ asm("movl %0,%%gs": :"r" (0)); -#define activate_mm(prev, next) \ - switch_mm((prev),(next),NULL) +#define activate_mm(prev, next) \ + do { \ + paravirt_activate_mm(prev, next); \ + switch_mm((prev),(next),NULL); \ + } while(0); #endif diff --git a/include/asm-i386/paravirt.h b/include/asm-i386/paravirt.h index f93599dc775..61c03f1e0c2 100644 --- a/include/asm-i386/paravirt.h +++ b/include/asm-i386/paravirt.h @@ -119,6 +119,12 @@ struct paravirt_ops void (*io_delay)(void); + void (*activate_mm)(struct mm_struct *prev, + struct mm_struct *next); + void (*dup_mmap)(struct mm_struct *oldmm, + struct mm_struct *mm); + void (*exit_mmap)(struct mm_struct *mm); + #ifdef CONFIG_X86_LOCAL_APIC void (*apic_write)(unsigned long reg, unsigned long v); void (*apic_write_atomic)(unsigned long reg, unsigned long v); @@ -395,6 +401,23 @@ static inline void startup_ipi_hook(int phys_apicid, unsigned long start_eip, } #endif +static inline void paravirt_activate_mm(struct mm_struct *prev, + struct mm_struct *next) +{ + paravirt_ops.activate_mm(prev, next); +} + +static inline void arch_dup_mmap(struct mm_struct *oldmm, + struct mm_struct *mm) +{ + paravirt_ops.dup_mmap(oldmm, mm); +} + +static inline void arch_exit_mmap(struct mm_struct *mm) +{ + paravirt_ops.exit_mmap(mm); +} + #define __flush_tlb() paravirt_ops.flush_tlb_user() #define __flush_tlb_global() paravirt_ops.flush_tlb_kernel() #define __flush_tlb_single(addr) paravirt_ops.flush_tlb_single(addr) -- cgit v1.2.3