4 files changed, 50 insertions, 32 deletions

diff --git a/arch/x86/include/asm/Kbuild b/arch/x86/include/asm/Kbuild
index 4a8e80cdcfa5..9f828f87ca35 100644
--- a/arch/x86/include/asm/Kbuild
+++ b/arch/x86/include/asm/Kbuild
@@ -10,6 +10,7 @@ header-y += ptrace-abi.h
 header-y += sigcontext32.h
 header-y += ucontext.h
 header-y += processor-flags.h
+header-y += hw_breakpoint.h
 
 unifdef-y += e820.h
 unifdef-y += ist.h
diff --git a/arch/x86/include/asm/debugreg.h b/arch/x86/include/asm/debugreg.h
index 23439fbb1d0e..9a3333c91f9a 100644
--- a/arch/x86/include/asm/debugreg.h
+++ b/arch/x86/include/asm/debugreg.h
@@ -75,13 +75,8 @@
  */
 #ifdef __KERNEL__
 
-/* For process management */
-extern void flush_thread_hw_breakpoint(struct task_struct *tsk);
-extern int copy_thread_hw_breakpoint(struct task_struct *tsk,
-                struct task_struct *child, unsigned long clone_flags);
+DECLARE_PER_CPU(unsigned long, dr7);
 
-/* For CPU management */
-extern void load_debug_registers(void);
 static inline void hw_breakpoint_disable(void)
 {
         /* Zero the control register for HW Breakpoint */
@@ -94,6 +89,10 @@ static inline void hw_breakpoint_disable(void)
         set_debugreg(0UL, 3);
 }
 
+#ifdef CONFIG_KVM
+extern void hw_breakpoint_restore(void);
+#endif
+
 #endif  /* __KERNEL__ */
 
 #endif /* _ASM_X86_DEBUGREG_H */
diff --git a/arch/x86/include/asm/hw_breakpoint.h b/arch/x86/include/asm/hw_breakpoint.h
index 3cfca8e2b5f6..0675a7c4c20e 100644
--- a/arch/x86/include/asm/hw_breakpoint.h
+++ b/arch/x86/include/asm/hw_breakpoint.h
@@ -4,6 +4,11 @@
 #ifdef  __KERNEL__
 #define __ARCH_HW_BREAKPOINT_H
 
+/*
+ * The name should probably be something dealt in
+ * a higher level. While dealing with the user
+ * (display/resolving)
+ */
 struct arch_hw_breakpoint {
         char            *name; /* Contains name of the symbol to set bkpt */
         unsigned long   address;
@@ -12,44 +17,57 @@ struct arch_hw_breakpoint {
 };
 
 #include <linux/kdebug.h>
-#include <linux/hw_breakpoint.h>
+#include <linux/percpu.h>
+#include <linux/list.h>
 
 /* Available HW breakpoint length encodings */
-#define HW_BREAKPOINT_LEN_1             0x40
-#define HW_BREAKPOINT_LEN_2             0x44
-#define HW_BREAKPOINT_LEN_4             0x4c
-#define HW_BREAKPOINT_LEN_EXECUTE       0x40
+#define X86_BREAKPOINT_LEN_1            0x40
+#define X86_BREAKPOINT_LEN_2            0x44
+#define X86_BREAKPOINT_LEN_4            0x4c
+#define X86_BREAKPOINT_LEN_EXECUTE      0x40
 
 #ifdef CONFIG_X86_64
-#define HW_BREAKPOINT_LEN_8             0x48
+#define X86_BREAKPOINT_LEN_8            0x48
 #endif
 
 /* Available HW breakpoint type encodings */
 
 /* trigger on instruction execute */
-#define HW_BREAKPOINT_EXECUTE   0x80
+#define X86_BREAKPOINT_EXECUTE  0x80
 /* trigger on memory write */
-#define HW_BREAKPOINT_WRITE     0x81
+#define X86_BREAKPOINT_WRITE    0x81
 /* trigger on memory read or write */
-#define HW_BREAKPOINT_RW        0x83
+#define X86_BREAKPOINT_RW       0x83
 
 /* Total number of available HW breakpoint registers */
 #define HBP_NUM 4
 
-extern struct hw_breakpoint *hbp_kernel[HBP_NUM];
-DECLARE_PER_CPU(struct hw_breakpoint*, this_hbp_kernel[HBP_NUM]);
-extern unsigned int hbp_user_refcount[HBP_NUM];
+struct perf_event;
+struct pmu;
 
-extern void arch_install_thread_hw_breakpoint(struct task_struct *tsk);
-extern void arch_uninstall_thread_hw_breakpoint(void);
 extern int arch_check_va_in_userspace(unsigned long va, u8 hbp_len);
-extern int arch_validate_hwbkpt_settings(struct hw_breakpoint *bp,
-                                                struct task_struct *tsk);
-extern void arch_update_user_hw_breakpoint(int pos, struct task_struct *tsk);
-extern void arch_flush_thread_hw_breakpoint(struct task_struct *tsk);
-extern void arch_update_kernel_hw_breakpoint(void *);
+extern int arch_validate_hwbkpt_settings(struct perf_event *bp,
+                                         struct task_struct *tsk);
 extern int hw_breakpoint_exceptions_notify(struct notifier_block *unused,
-                                     unsigned long val, void *data);
+                                           unsigned long val, void *data);
+
+
+int arch_install_hw_breakpoint(struct perf_event *bp);
+void arch_uninstall_hw_breakpoint(struct perf_event *bp);
+void hw_breakpoint_pmu_read(struct perf_event *bp);
+void hw_breakpoint_pmu_unthrottle(struct perf_event *bp);
+
+extern void
+arch_fill_perf_breakpoint(struct perf_event *bp);
+
+unsigned long encode_dr7(int drnum, unsigned int len, unsigned int type);
+int decode_dr7(unsigned long dr7, int bpnum, unsigned *len, unsigned *type);
+
+extern int arch_bp_generic_fields(int x86_len, int x86_type,
+                                  int *gen_len, int *gen_type);
+
+extern struct pmu perf_ops_bp;
+
 #endif  /* __KERNEL__ */
 #endif  /* _I386_HW_BREAKPOINT_H */
 
diff --git a/arch/x86/include/asm/processor.h b/arch/x86/include/asm/processor.h
index 61aafb71c7ef..820f3000f736 100644
--- a/arch/x86/include/asm/processor.h
+++ b/arch/x86/include/asm/processor.h
@@ -423,6 +423,8 @@ extern unsigned int xstate_size;
 extern void free_thread_xstate(struct task_struct *);
 extern struct kmem_cache *task_xstate_cachep;
 
+struct perf_event;
+
 struct thread_struct {
         /* Cached TLS descriptors: */
         struct desc_struct      tls_array[GDT_ENTRY_TLS_ENTRIES];
@@ -444,12 +446,10 @@ struct thread_struct {
         unsigned long           fs;
 #endif
         unsigned long           gs;
-        /* Hardware debugging registers: */
-        unsigned long           debugreg[HBP_NUM];
-        unsigned long           debugreg6;
-        unsigned long           debugreg7;
-        /* Hardware breakpoint info */
-        struct hw_breakpoint    *hbp[HBP_NUM];
+        /* Save middle states of ptrace breakpoints */
+        struct perf_event       *ptrace_bps[HBP_NUM];
+        /* Debug status used for traps, single steps, etc... */
+        unsigned long           debugreg6;
         /* Fault info: */
         unsigned long           cr2;
         unsigned long           trap_no;