[PATCH 4/5] x86: hypercall vector is unused when !PV32

[Jan Beulich <jbeulich@xxxxxxxx>]

This vector can be used as an ordinary interrupt handling one in this
case. To be sure no references are left, make the #define itself
conditional.

Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>

--- a/xen/arch/x86/irq.c
+++ b/xen/arch/x86/irq.c
@@ -436,8 +436,12 @@ int __init init_irq_data(void)
         irq_to_desc(irq)->irq = irq;
 
 #ifdef CONFIG_PV
-    /* Never allocate the hypercall vector or Linux/BSD fast-trap vector. */
+    /* Never allocate the Linux/BSD fast-trap vector. */
     set_bit(LEGACY_SYSCALL_VECTOR, used_vectors);
+#endif
+
+#ifdef CONFIG_PV32
+    /* Never allocate the hypercall vector. */
     set_bit(HYPERCALL_VECTOR, used_vectors);
 #endif
     
--- a/xen/arch/x86/pv/traps.c
+++ b/xen/arch/x86/pv/traps.c
@@ -30,6 +30,7 @@
 #include <asm/traps.h>
 #include <irq_vectors.h>
 
+#ifdef CONFIG_PV32
 void do_entry_int82(struct cpu_user_regs *regs)
 {
     if ( unlikely(untrusted_msi) )
@@ -37,6 +38,7 @@ void do_entry_int82(struct cpu_user_regs
 
     pv_hypercall(regs);
 }
+#endif
 
 void pv_inject_event(const struct x86_event *event)
 {
@@ -155,9 +157,11 @@ static void nmi_softirq(void)
 
 void __init pv_trap_init(void)
 {
+#ifdef CONFIG_PV32
     /* The 32-on-64 hypercall vector is only accessible from ring 1. */
     _set_gate(idt_table + HYPERCALL_VECTOR,
               SYS_DESC_trap_gate, 1, entry_int82);
+#endif
 
     /* Fast trap for int80 (faster than taking the #GP-fixup path). */
     _set_gate(idt_table + LEGACY_SYSCALL_VECTOR, SYS_DESC_trap_gate, 3,
--- a/xen/arch/x86/x86_64/compat/entry.S
+++ b/xen/arch/x86/x86_64/compat/entry.S
@@ -11,6 +11,8 @@
 #include <public/xen.h>
 #include <irq_vectors.h>
 
+#ifdef CONFIG_PV32
+
 ENTRY(entry_int82)
         ASM_CLAC
         pushq $0
@@ -27,6 +29,8 @@ ENTRY(entry_int82)
         mov   %rsp, %rdi
         call  do_entry_int82
 
+#endif /* CONFIG_PV32 */
+
 /* %rbx: struct vcpu */
 ENTRY(compat_test_all_events)
         ASSERT_NOT_IN_ATOMIC
--- a/xen/arch/x86/x86_64/entry.S
+++ b/xen/arch/x86/x86_64/entry.S
@@ -982,8 +982,10 @@ autogen_stubs: /* Automatically generate
         .rept X86_NR_VECTORS
 
         /* Common interrupts, heading towards do_IRQ(). */
-#ifdef CONFIG_PV
+#if defined(CONFIG_PV32)
         .if vec >= FIRST_IRQ_VECTOR && vec != HYPERCALL_VECTOR && vec != 
LEGACY_SYSCALL_VECTOR
+#elif defined(CONFIG_PV)
+        .if vec >= FIRST_IRQ_VECTOR && vec != LEGACY_SYSCALL_VECTOR
 #else
         .if vec >= FIRST_IRQ_VECTOR
 #endif
--- a/xen/include/asm-x86/mach-default/irq_vectors.h
+++ b/xen/include/asm-x86/mach-default/irq_vectors.h
@@ -22,7 +22,10 @@
 #define FIRST_LEGACY_VECTOR     FIRST_DYNAMIC_VECTOR
 #define LAST_LEGACY_VECTOR      (FIRST_LEGACY_VECTOR + 0xf)
 
-#define HYPERCALL_VECTOR       0x82
+#ifdef CONFIG_PV32
+#define HYPERCALL_VECTOR        0x82
+#endif
+
 #define LEGACY_SYSCALL_VECTOR   0x80
 
 /*