WARNING - OLD ARCHIVES

This is an archived copy of the Xen.org mailing list, which we have preserved to ensure that existing links to archives are not broken. The live archive, which contains the latest emails, can be found at http://lists.xen.org/
   
 
 
Xen 
 
Home Products Support Community News
 
   
 

xen-devel

[Xen-devel] [patch 09/21] Xen-paravirt: add hooks to intercept mm creati

To: Andi Kleen <ak@xxxxxx>
Subject: [Xen-devel] [patch 09/21] Xen-paravirt: add hooks to intercept mm creation and destruction
From: Jeremy Fitzhardinge <jeremy@xxxxxxxx>
Date: Tue, 13 Feb 2007 14:17:38 -0800
Cc: Andrew Morton <akpm@xxxxxxxx>, Zachary Amsden <zach@xxxxxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxx, linux-kernel@xxxxxxxxxxxxxxx, Chris Wright <chrisw@xxxxxxxxxxxx>, virtualization@xxxxxxxxxxxxxx
Delivery-date: Tue, 13 Feb 2007 14:30:51 -0800
Envelope-to: www-data@xxxxxxxxxxxxxxxxxx
List-help: <mailto:xen-devel-request@lists.xensource.com?subject=help>
List-id: Xen developer discussion <xen-devel.lists.xensource.com>
List-post: <mailto:xen-devel@lists.xensource.com>
List-subscribe: <http://lists.xensource.com/cgi-bin/mailman/listinfo/xen-devel>, <mailto:xen-devel-request@lists.xensource.com?subject=subscribe>
List-unsubscribe: <http://lists.xensource.com/cgi-bin/mailman/listinfo/xen-devel>, <mailto:xen-devel-request@lists.xensource.com?subject=unsubscribe>
References: <20070213221729.772002682@xxxxxxxx>
Sender: xen-devel-bounces@xxxxxxxxxxxxxxxxxxx
User-agent: quilt/0.46-1
Add hooks to allow a paravirt implementation to track the lifetime of
an mm.

Signed-off-by: Jeremy Fitzhardinge <jeremy@xxxxxxxxxxxxx>
--
 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 <asm/atomic.h>
 #include <asm/pgalloc.h>
 #include <asm/tlbflush.h>
+#include <asm/paravirt.h>
 
 /*
  * 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,%%fs": :"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 (fastcall *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 (fastcall *apic_write)(unsigned long reg, unsigned long v);
        void (fastcall *apic_write_atomic)(unsigned long reg, unsigned long v);
@@ -429,6 +435,24 @@ static inline void paravirt_pagetable_se
                (*paravirt_ops.pagetable_setup_done)(base);
 }
 
+#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);

-- 


_______________________________________________
Xen-devel mailing list
Xen-devel@xxxxxxxxxxxxxxxxxxx
http://lists.xensource.com/xen-devel

<Prev in Thread] Current Thread [Next in Thread>