1 files changed, 17 insertions, 4 deletions

diff --git a/arch/x86/mm/fault.c b/arch/x86/mm/fault.c
index 2dbf6bf4c7e..0d17c8c50ac 100644
--- a/arch/x86/mm/fault.c
+++ b/arch/x86/mm/fault.c
@@ -17,6 +17,7 @@
 #include <asm/traps.h>                  /* dotraplinkage, ...           */
 #include <asm/pgalloc.h>                /* pgd_*(), ...                 */
 #include <asm/kmemcheck.h>              /* kmemcheck_*(), ...           */
+#include <asm/vsyscall.h>
 
 /*
  * Page fault error code bits:
@@ -105,7 +106,7 @@ check_prefetch_opcode(struct pt_regs *regs, unsigned char *instr,
                  * but for now it's good enough to assume that long
                  * mode only uses well known segments or kernel.
                  */
-                return (!user_mode(regs)) || (regs->cs == __USER_CS);
+                return (!user_mode(regs) || user_64bit_mode(regs));
 #endif
         case 0x60:
                 /* 0x64 thru 0x67 are valid prefixes in all modes. */
@@ -720,6 +721,18 @@ __bad_area_nosemaphore(struct pt_regs *regs, unsigned long error_code,
                 if (is_errata100(regs, address))
                         return;
 
+#ifdef CONFIG_X86_64
+                /*
+                 * Instruction fetch faults in the vsyscall page might need
+                 * emulation.
+                 */
+                if (unlikely((error_code & PF_INSTR) &&
+                             ((address & ~0xfff) == VSYSCALL_START))) {
+                        if (emulate_vsyscall(regs, address))
+                                return;
+                }
+#endif
+
                 if (unlikely(show_unhandled_signals))
                         show_signal_msg(regs, error_code, address, tsk);
 
@@ -1059,7 +1072,7 @@ do_page_fault(struct pt_regs *regs, unsigned long error_code)
         if (unlikely(error_code & PF_RSVD))
                 pgtable_bad(regs, error_code, address);
 
-        perf_sw_event(PERF_COUNT_SW_PAGE_FAULTS, 1, 0, regs, address);
+        perf_sw_event(PERF_COUNT_SW_PAGE_FAULTS, 1, regs, address);
 
         /*
          * If we're in an interrupt, have no user context or are running
@@ -1161,11 +1174,11 @@ good_area:
         if (flags & FAULT_FLAG_ALLOW_RETRY) {
                 if (fault & VM_FAULT_MAJOR) {
                         tsk->maj_flt++;
-                        perf_sw_event(PERF_COUNT_SW_PAGE_FAULTS_MAJ, 1, 0,
+                        perf_sw_event(PERF_COUNT_SW_PAGE_FAULTS_MAJ, 1,
                                       regs, address);
                 } else {
                         tsk->min_flt++;
-                        perf_sw_event(PERF_COUNT_SW_PAGE_FAULTS_MIN, 1, 0,
+                        perf_sw_event(PERF_COUNT_SW_PAGE_FAULTS_MIN, 1,
                                       regs, address);
                 }
                 if (fault & VM_FAULT_RETRY) {