xen: put more code under CONFIG_CRASH_DEBUG

debugger_trap_entry() is not needed without CONFIG_CRASH_DEBUG, so only
include it if CONFIG_CRASH_DEBUG is defined.

While at it remove CONFIG_HAS_GDBSX as it can easily be replaced by
CONFIG_CRASH_DEBUG.

Signed-off-by: Juergen Gross <jgross@suse.com>
Acked-by: George Dunlap <george.dunlap@citrix.com>
Reviewed-by: Andrew Cooper <andrew.cooper3@citrix.com>

xen/arch/x86/Kconfig

@@ -13,7 +13,6 @@ config X86
 	select HAS_EHCI
 	select HAS_EX_TABLE
 	select HAS_FAST_MULTIPLY
-	select HAS_GDBSX
 	select HAS_IOPORTS
 	select HAS_KEXEC
 	select MEM_ACCESS_ALWAYS_ON

xen/arch/x86/domain.c

@@ -2317,6 +2317,19 @@ static int __init init_vcpu_kick_softirq(void)
 }
 __initcall(init_vcpu_kick_softirq);
 
+void domain_pause_for_debugger(void)
+{
+#ifdef CONFIG_CRASH_DEBUG
+    struct vcpu *curr = current;
+    struct domain *d = curr->domain;
+
+    domain_pause_by_systemcontroller_nosync(d);
+
+    /* if gdbsx active, we just need to pause the domain */
+    if ( curr->arch.gdbsx_vcpu_event == 0 )
+        send_global_virq(VIRQ_DEBUGGER);
+#endif
+}
 
 /*
  * Local variables:

xen/arch/x86/hvm/vmx/realmode.c

@@ -14,6 +14,7 @@
 #include <xen/sched.h>
 #include <xen/paging.h>
 #include <xen/softirq.h>
+#include <asm/debugger.h>
 #include <asm/event.h>
 #include <asm/hvm/emulate.h>
 #include <asm/hvm/hvm.h>

xen/common/Kconfig

@@ -57,9 +57,6 @@ config HAS_UBSAN
 config HAS_KEXEC
 	bool
 
-config HAS_GDBSX
-	bool
-
 config HAS_IOPORTS
 	bool
 

xen/common/domain.c

@@ -915,20 +915,6 @@ void vcpu_end_shutdown_deferral(struct vcpu *v)
         vcpu_check_shutdown(v);
 }
 
-#ifdef CONFIG_HAS_GDBSX
-void domain_pause_for_debugger(void)
-{
-    struct vcpu *curr = current;
-    struct domain *d = curr->domain;
-
-    domain_pause_by_systemcontroller_nosync(d);
-
-    /* if gdbsx active, we just need to pause the domain */
-    if ( curr->arch.gdbsx_vcpu_event == 0 )
-        send_global_virq(VIRQ_DEBUGGER);
-}
-#endif
-
 /* Complete domain destroy after RCU readers are not holding old references. */
 static void complete_domain_destroy(struct rcu_head *head)
 {

xen/include/asm-x86/debugger.h

@@ -33,6 +33,8 @@
 #include <asm/regs.h>
 #include <asm/processor.h>
 
+void domain_pause_for_debugger(void);
+
 #ifdef CONFIG_CRASH_DEBUG
 
 #include <xen/gdbstub.h>
@@ -47,18 +49,6 @@ static inline bool debugger_trap_fatal(
 /* Int3 is a trivial way to gather cpu_user_regs context. */
 #define debugger_trap_immediate() __asm__ __volatile__ ( "int3" );
 
-#else
-
-static inline bool debugger_trap_fatal(
-    unsigned int vector, struct cpu_user_regs *regs)
-{
-    return false;
-}
-
-#define debugger_trap_immediate() ((void)0)
-
-#endif
-
 static inline bool debugger_trap_entry(
     unsigned int vector, struct cpu_user_regs *regs)
 {
@@ -84,6 +74,24 @@ static inline bool debugger_trap_entry(
     return false;
 }
 
+#else
+
+static inline bool debugger_trap_fatal(
+    unsigned int vector, struct cpu_user_regs *regs)
+{
+    return false;
+}
+
+#define debugger_trap_immediate() ((void)0)
+
+static inline bool debugger_trap_entry(
+    unsigned int vector, struct cpu_user_regs *regs)
+{
+    return false;
+}
+
+#endif
+
 unsigned int dbg_rw_mem(void * __user addr, void * __user buf,
                         unsigned int len, domid_t domid, bool toaddr,
                         uint64_t pgd3);

xen/include/xen/sched.h

@@ -655,7 +655,6 @@ void domain_destroy(struct domain *d);
 int domain_kill(struct domain *d);
 int domain_shutdown(struct domain *d, u8 reason);
 void domain_resume(struct domain *d);
-void domain_pause_for_debugger(void);
 
 int domain_soft_reset(struct domain *d);