[Xen-changelog] [xen stable-4.5] x86/traps: export the exception_table[] function pointer table to C

[patchbot@xxxxxxx]

commit ad6b254f10559c68c4882ab1bb3fe6259240981c
Author:     Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
AuthorDate: Wed Feb 18 16:41:20 2015 +0100
Commit:     Jan Beulich <jbeulich@xxxxxxxx>
CommitDate: Wed Feb 18 16:41:20 2015 +0100

    x86/traps: export the exception_table[] function pointer table to C
    
    and use it in preference to the direct call to do_nmi() in vmx.c
    
    The value 'TRAP_last_reserved' was only used where 'TRAP_nr' would be more
    appropriate, so is replaced.
    
    No functional change
    
    Signed-off-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
    Reviewed-by: Jan Beulich <jbeulich@xxxxxxxx>
    master commit: d3eb16b8a7c06f0d2a2110948a8477a62b541bbf
    master date: 2015-02-11 17:16:18 +0100
---
 xen/arch/x86/hvm/vmx/vmx.c      |    2 +-
 xen/arch/x86/x86_64/entry.S     |    5 +++--
 xen/include/asm-x86/processor.h |    5 ++++-
 3 files changed, 8 insertions(+), 4 deletions(-)

diff --git a/xen/arch/x86/hvm/vmx/vmx.c b/xen/arch/x86/hvm/vmx/vmx.c
index f2554d6..f40f89d 100644
--- a/xen/arch/x86/hvm/vmx/vmx.c
+++ b/xen/arch/x86/hvm/vmx/vmx.c
@@ -2686,7 +2686,7 @@ void vmx_vmexit_handler(struct cpu_user_regs *regs)
              && ((intr_info & INTR_INFO_INTR_TYPE_MASK) ==
                  (X86_EVENTTYPE_NMI << 8)) )
         {
-            do_nmi(regs);
+            exception_table[TRAP_nmi](regs);
             enable_nmis();
         }
         break;
diff --git a/xen/arch/x86/x86_64/entry.S b/xen/arch/x86/x86_64/entry.S
index b3d6e32..062c690 100644
--- a/xen/arch/x86/x86_64/entry.S
+++ b/xen/arch/x86/x86_64/entry.S
@@ -728,9 +728,10 @@ ENTRY(exception_table)
         .quad do_alignment_check
         .quad do_machine_check
         .quad do_simd_coprocessor_error
-        .rept TRAP_last_reserved + 1 - ((. - exception_table) / 8)
+        .rept TRAP_nr - ((. - exception_table) / 8)
         .quad do_reserved_trap /* Architecturally reserved exceptions. */
         .endr
+        .size exception_table, . - exception_table
 
 ENTRY(hypercall_table)
         .quad do_set_trap_table     /*  0 */
@@ -857,7 +858,7 @@ autogen_stubs: /* Automatically generated stubs. */
         entrypoint 1b
 
         /* Reserved exceptions, heading towards do_reserved_trap(). */
-        .elseif vec == TRAP_copro_seg || vec == TRAP_spurious_int || (vec > 
TRAP_simd_error && vec <= TRAP_last_reserved)
+        .elseif vec == TRAP_copro_seg || vec == TRAP_spurious_int || (vec > 
TRAP_simd_error && vec < TRAP_nr)
 
 1:      test  $8,%spl        /* 64bit exception frames are 16 byte aligned, 
but the word */
         jz    2f             /* size is 8 bytes.  Check whether the processor 
gave us an */
diff --git a/xen/include/asm-x86/processor.h b/xen/include/asm-x86/processor.h
index f98eaf5..b86f600 100644
--- a/xen/include/asm-x86/processor.h
+++ b/xen/include/asm-x86/processor.h
@@ -114,7 +114,7 @@
 #define TRAP_machine_check    18
 #define TRAP_simd_error       19
 #define TRAP_virtualisation   20
-#define TRAP_last_reserved    31
+#define TRAP_nr               32
 
 /* Set for entry via SYSCALL. Informs return code to use SYSRETQ not IRETQ. */
 /* NB. Same as VGCF_in_syscall. No bits in common with any other TRAP_ defn. */
@@ -492,6 +492,9 @@ extern void mtrr_bp_init(void);
 
 void mcheck_init(struct cpuinfo_x86 *c, bool_t bsp);
 
+/* Dispatch table for exceptions */
+extern void (* const exception_table[TRAP_nr])(struct cpu_user_regs *regs);
+
 #define DECLARE_TRAP_HANDLER(_name)                    \
     void _name(void);                                  \
     void do_ ## _name(struct cpu_user_regs *regs)
--
generated by git-patchbot for /home/xen/git/xen.git#stable-4.5

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