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[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 <jeremy@xensource.com> Signed-off-by: Andi Kleen <ak@suse.de> Cc: linux-arch@vger.kernel.org Cc: James Bottomley <James.Bottomley@SteelEye.com> Acked-by: Ingo Molnar <mingo@elte.hu>
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@ -237,6 +237,10 @@ struct paravirt_ops paravirt_ops = {
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.irq_enable_sysexit = native_irq_enable_sysexit,
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.iret = native_iret,
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.dup_mmap = paravirt_nop,
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.exit_mmap = paravirt_nop,
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.activate_mm = paravirt_nop,
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.startup_ipi_hook = paravirt_nop,
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};
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@ -10,6 +10,7 @@
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#include <asm/system.h>
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#include <asm/machvec.h>
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#include <asm/compiler.h>
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#include <asm-generic/mm_hooks.h>
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/*
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* Force a context reload. This is needed when we change the page
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@ -16,6 +16,7 @@
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#include <linux/compiler.h>
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#include <asm/cacheflush.h>
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#include <asm/proc-fns.h>
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#include <asm-generic/mm_hooks.h>
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void __check_kvm_seq(struct mm_struct *mm);
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@ -13,6 +13,8 @@
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#ifndef __ASM_ARM_MMU_CONTEXT_H
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#define __ASM_ARM_MMU_CONTEXT_H
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#include <asm-generic/mm_hooks.h>
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#define init_new_context(tsk,mm) 0
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#define destroy_context(mm) do { } while(0)
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@ -15,6 +15,7 @@
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#include <asm/tlbflush.h>
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#include <asm/pgalloc.h>
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#include <asm/sysreg.h>
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#include <asm-generic/mm_hooks.h>
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/*
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* The MMU "context" consists of two things:
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@ -1,6 +1,8 @@
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#ifndef __CRIS_MMU_CONTEXT_H
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#define __CRIS_MMU_CONTEXT_H
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#include <asm-generic/mm_hooks.h>
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extern int init_new_context(struct task_struct *tsk, struct mm_struct *mm);
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extern void get_mmu_context(struct mm_struct *mm);
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extern void destroy_context(struct mm_struct *mm);
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@ -15,6 +15,7 @@
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#include <asm/setup.h>
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#include <asm/page.h>
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#include <asm/pgalloc.h>
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#include <asm-generic/mm_hooks.h>
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static inline void enter_lazy_tlb(struct mm_struct *mm, struct task_struct *tsk)
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{
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18
include/asm-generic/mm_hooks.h
Normal file
18
include/asm-generic/mm_hooks.h
Normal file
@ -0,0 +1,18 @@
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/*
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* Define generic no-op hooks for arch_dup_mmap and arch_exit_mmap, to
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* be included in asm-FOO/mmu_context.h for any arch FOO which doesn't
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* need to hook these.
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*/
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#ifndef _ASM_GENERIC_MM_HOOKS_H
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#define _ASM_GENERIC_MM_HOOKS_H
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static inline void arch_dup_mmap(struct mm_struct *oldmm,
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struct mm_struct *mm)
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{
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}
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static inline void arch_exit_mmap(struct mm_struct *mm)
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{
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}
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#endif /* _ASM_GENERIC_MM_HOOKS_H */
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@ -4,6 +4,7 @@
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#include <asm/setup.h>
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#include <asm/page.h>
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#include <asm/pgalloc.h>
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#include <asm-generic/mm_hooks.h>
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static inline void enter_lazy_tlb(struct mm_struct *mm, struct task_struct *tsk)
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{
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@ -5,6 +5,16 @@
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#include <asm/atomic.h>
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#include <asm/pgalloc.h>
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#include <asm/tlbflush.h>
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#include <asm/paravirt.h>
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#ifndef CONFIG_PARAVIRT
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#include <asm-generic/mm_hooks.h>
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static inline void paravirt_activate_mm(struct mm_struct *prev,
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struct mm_struct *next)
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{
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}
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#endif /* !CONFIG_PARAVIRT */
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/*
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* Used for LDT copy/destruction.
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@ -65,7 +75,10 @@ static inline void switch_mm(struct mm_struct *prev,
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#define deactivate_mm(tsk, mm) \
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asm("movl %0,%%gs": :"r" (0));
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#define activate_mm(prev, next) \
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switch_mm((prev),(next),NULL)
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#define activate_mm(prev, next) \
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do { \
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paravirt_activate_mm(prev, next); \
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switch_mm((prev),(next),NULL); \
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} while(0);
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#endif
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@ -119,6 +119,12 @@ struct paravirt_ops
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void (*io_delay)(void);
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void (*activate_mm)(struct mm_struct *prev,
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struct mm_struct *next);
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void (*dup_mmap)(struct mm_struct *oldmm,
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struct mm_struct *mm);
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void (*exit_mmap)(struct mm_struct *mm);
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#ifdef CONFIG_X86_LOCAL_APIC
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void (*apic_write)(unsigned long reg, unsigned long v);
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void (*apic_write_atomic)(unsigned long reg, unsigned long v);
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@ -395,6 +401,23 @@ static inline void startup_ipi_hook(int phys_apicid, unsigned long start_eip,
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}
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#endif
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static inline void paravirt_activate_mm(struct mm_struct *prev,
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struct mm_struct *next)
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{
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paravirt_ops.activate_mm(prev, next);
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}
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static inline void arch_dup_mmap(struct mm_struct *oldmm,
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struct mm_struct *mm)
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{
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paravirt_ops.dup_mmap(oldmm, mm);
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}
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static inline void arch_exit_mmap(struct mm_struct *mm)
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{
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paravirt_ops.exit_mmap(mm);
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}
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#define __flush_tlb() paravirt_ops.flush_tlb_user()
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#define __flush_tlb_global() paravirt_ops.flush_tlb_kernel()
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#define __flush_tlb_single(addr) paravirt_ops.flush_tlb_single(addr)
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@ -29,6 +29,7 @@
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#include <linux/spinlock.h>
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#include <asm/processor.h>
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#include <asm-generic/mm_hooks.h>
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struct ia64_ctx {
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spinlock_t lock;
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@ -15,6 +15,7 @@
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#include <asm/pgalloc.h>
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#include <asm/mmu.h>
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#include <asm/tlbflush.h>
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#include <asm-generic/mm_hooks.h>
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/*
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* Cache of MMU context last used.
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@ -1,6 +1,7 @@
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#ifndef __M68K_MMU_CONTEXT_H
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#define __M68K_MMU_CONTEXT_H
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#include <asm-generic/mm_hooks.h>
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static inline void enter_lazy_tlb(struct mm_struct *mm, struct task_struct *tsk)
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{
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@ -4,6 +4,7 @@
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#include <asm/setup.h>
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#include <asm/page.h>
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#include <asm/pgalloc.h>
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#include <asm-generic/mm_hooks.h>
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static inline void enter_lazy_tlb(struct mm_struct *mm, struct task_struct *tsk)
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{
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@ -20,6 +20,7 @@
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#include <asm/mipsmtregs.h>
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#include <asm/smtc.h>
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#endif /* SMTC */
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#include <asm-generic/mm_hooks.h>
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/*
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* For the fast tlb miss handlers, we keep a per cpu array of pointers
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#include <asm/atomic.h>
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#include <asm/pgalloc.h>
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#include <asm/pgtable.h>
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#include <asm-generic/mm_hooks.h>
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static inline void enter_lazy_tlb(struct mm_struct *mm, struct task_struct *tsk)
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{
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@ -10,6 +10,7 @@
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#include <linux/mm.h>
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#include <asm/mmu.h>
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#include <asm/cputable.h>
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#include <asm-generic/mm_hooks.h>
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/*
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* Copyright (C) 2001 PPC 64 Team, IBM Corp
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@ -6,6 +6,7 @@
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#include <asm/bitops.h>
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#include <asm/mmu.h>
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#include <asm/cputable.h>
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#include <asm-generic/mm_hooks.h>
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/*
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* On 32-bit PowerPC 6xx/7xx/7xxx CPUs, we use a set of 16 VSIDs
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@ -10,6 +10,8 @@
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#define __S390_MMU_CONTEXT_H
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#include <asm/pgalloc.h>
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#include <asm-generic/mm_hooks.h>
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/*
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* get a new mmu context.. S390 don't know about contexts.
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*/
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#include <asm/tlbflush.h>
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#include <asm/uaccess.h>
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#include <asm/io.h>
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#include <asm-generic/mm_hooks.h>
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/*
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* The MMU "context" consists of two things:
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extern unsigned long mmu_context_cache;
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#include <asm/page.h>
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#include <asm-generic/mm_hooks.h>
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/* Current mm's pgd */
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extern pgd_t *mmu_pdtp_cache;
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#ifndef __ASSEMBLY__
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#include <asm-generic/mm_hooks.h>
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static inline void enter_lazy_tlb(struct mm_struct *mm, struct task_struct *tsk)
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{
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}
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#include <linux/spinlock.h>
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#include <asm/system.h>
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#include <asm/spitfire.h>
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#include <asm-generic/mm_hooks.h>
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static inline void enter_lazy_tlb(struct mm_struct *mm, struct task_struct *tsk)
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{
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#ifndef __UM_MMU_CONTEXT_H
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#define __UM_MMU_CONTEXT_H
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#include <asm-generic/mm_hooks.h>
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#include "linux/sched.h"
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#include "choose-mode.h"
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#include "um_mmu.h"
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@ -1,6 +1,8 @@
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#ifndef __V850_MMU_CONTEXT_H__
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#define __V850_MMU_CONTEXT_H__
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#include <asm-generic/mm_hooks.h>
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#define destroy_context(mm) ((void)0)
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#define init_new_context(tsk,mm) 0
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#define switch_mm(prev,next,tsk) ((void)0)
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#include <asm/pda.h>
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#include <asm/pgtable.h>
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#include <asm/tlbflush.h>
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#include <asm-generic/mm_hooks.h>
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/*
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* possibly do the LDT unload here?
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@ -18,6 +18,7 @@
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#include <asm/pgtable.h>
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#include <asm/cacheflush.h>
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#include <asm/tlbflush.h>
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#include <asm-generic/mm_hooks.h>
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#define XCHAL_MMU_ASID_BITS 8
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@ -286,6 +286,8 @@ static inline int dup_mmap(struct mm_struct *mm, struct mm_struct *oldmm)
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if (retval)
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goto out;
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}
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/* a new mm has just been created */
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arch_dup_mmap(oldmm, mm);
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retval = 0;
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out:
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up_write(&mm->mmap_sem);
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#include <asm/uaccess.h>
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#include <asm/cacheflush.h>
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#include <asm/tlb.h>
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#include <asm/mmu_context.h>
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#ifndef arch_mmap_check
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#define arch_mmap_check(addr, len, flags) (0)
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@ -1979,6 +1980,9 @@ void exit_mmap(struct mm_struct *mm)
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unsigned long nr_accounted = 0;
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unsigned long end;
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/* mm's last user has gone, and its about to be pulled down */
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arch_exit_mmap(mm);
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lru_add_drain();
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flush_cache_mm(mm);
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tlb = tlb_gather_mmu(mm, 1);
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