Merge branch 'x86-vdso-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-tip

* 'x86-vdso-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-tip:
  x86-64: Rework vsyscall emulation and add vsyscall= parameter
  x86-64: Wire up getcpu syscall
  x86: Remove unnecessary compile flag tweaks for vsyscall code
  x86-64: Add vsyscall:emulate_vsyscall trace event
  x86-64: Add user_64bit_mode paravirt op
  x86-64, xen: Enable the vvar mapping
  x86-64: Work around gold bug 13023
  x86-64: Move the "user" vsyscall segment out of the data segment.
  x86-64: Pad vDSO to a page boundary

1 files changed, 13 insertions, 1 deletions

diff --git a/arch/x86/mm/fault.c b/arch/x86/mm/fault.c
index 4d09df054e39..247aae3dc008 100644
--- a/arch/x86/mm/fault.c
+++ b/arch/x86/mm/fault.c
@@ -105,7 +105,7 @@ 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 +720,18 @@ __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);