Add hooks to allow a paravirt implementation to track the lifetime of an mm. Signed-off-by: Jeremy Fitzhardinge -- arch/i386/kernel/paravirt.c | 4 ++++ include/asm-i386/mmu_context.h | 8 ++++++-- include/asm-i386/paravirt.h | 38 ++++++++++++++++++++++++++++++++++++++ kernel/fork.c | 3 +++ mm/mmap.c | 4 ++++ 5 files changed, 55 insertions(+), 2 deletions(-) =================================================================== --- a/arch/i386/kernel/paravirt.c +++ b/arch/i386/kernel/paravirt.c @@ -706,6 +706,10 @@ struct paravirt_ops paravirt_ops = { .irq_enable_sysexit = native_irq_enable_sysexit, .iret = native_iret, + .dup_mmap = (void *)native_nop, + .exit_mmap = (void *)native_nop, + .activate_mm = (void *)native_nop, + .startup_ipi_hook = (void *)native_nop, }; =================================================================== --- a/include/asm-i386/mmu_context.h +++ b/include/asm-i386/mmu_context.h @@ -5,6 +5,7 @@ #include #include #include +#include /* * Used for LDT copy/destruction. @@ -65,7 +66,10 @@ static inline void switch_mm(struct mm_s #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 { \ + arch_activate_mm(prev, next); \ + switch_mm((prev),(next),NULL); \ + } while(0); #endif =================================================================== --- a/include/asm-i386/paravirt.h +++ b/include/asm-i386/paravirt.h @@ -126,6 +126,12 @@ struct paravirt_ops void (*io_delay)(void); void (*const_udelay)(unsigned long loops); + void (fastcall *activate_mm)(struct mm_struct *prev, + struct mm_struct *next); + void (fastcall *dup_mmap)(struct mm_struct *oldmm, + struct mm_struct *mm); + void (fastcall *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); @@ -429,6 +435,24 @@ static inline void startup_ipi_hook(int } #endif +#define __HAVE_ARCH_MM_LIFETIME +static inline void arch_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) @@ -673,5 +697,20 @@ static inline void paravirt_pagetable_se set_pgd(&base[0], base[USER_PTRS_PER_PGD]); #endif } + +static inline void paravirt_activate_mm(struct mm_struct *prev, + struct mm_struct *next) +{ +} + +static inline void paravirt_dup_mmap(struct mm_struct *oldmm, + struct mm_struct *mm) +{ +} + +static inline void paravirt_exit_mmap(struct mm_struct *mm) +{ +} + #endif /* CONFIG_PARAVIRT */ #endif /* __ASM_PARAVIRT_H */ =================================================================== --- a/include/linux/sched.h +++ b/include/linux/sched.h @@ -374,6 +374,12 @@ struct mm_struct { rwlock_t ioctx_list_lock; struct kioctx *ioctx_list; }; + +#ifndef __HAVE_ARCH_MM_LIFETIME +#define arch_activate_mm(prev, next) do {} while(0) +#define arch_dup_mmap(oldmm, mm) do {} while(0) +#define arch_exit_mmap(mm) do {} while(0) +#endif struct sighand_struct { atomic_t count; =================================================================== --- a/kernel/fork.c +++ b/kernel/fork.c @@ -286,6 +286,7 @@ static inline int dup_mmap(struct mm_str if (retval) goto out; } + arch_dup_mmap(oldmm, mm); retval = 0; out: up_write(&mm->mmap_sem); =================================================================== --- a/mm/mmap.c +++ b/mm/mmap.c @@ -1976,6 +1976,8 @@ void exit_mmap(struct mm_struct *mm) struct vm_area_struct *vma = mm->mmap; unsigned long nr_accounted = 0; unsigned long end; + + arch_exit_mmap(mm); lru_add_drain(); flush_cache_mm(mm); -- - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/