x86/pv: Move x86/trace.c to x86/pv/trace.c

This entire file is pv-only, and not excluded from the build by
CONFIG_TRACEBUFFER.  Move it into the pv/ directory, build it conditionally,
and drop unused includes.

Also move the contents of asm/trace.h to asm/pv/trace.h to avoid the functions
being declared across the entire hypervisor.

One caller in fixup_page_fault() is effectively PV only, but is not subject to
dead code elimination.  Add an additional IS_ENABLED(CONFIG_PV) to keep the
build happy.

Signed-off-by: Andrew Cooper <andrew.cooper3@citrix.com>
Reviewed-by: Jan Beulich <jbeulich@suse.com>

xen/arch/x86/Makefile

@@ -61,7 +61,6 @@ obj-y += spec_ctrl.o
 obj-y += srat.o
 obj-y += string.o
 obj-y += time.o
-obj-y += trace.o
 obj-y += traps.o
 obj-y += tsx.o
 obj-y += usercopy.o

xen/arch/x86/pv/Makefile

@@ -12,6 +12,7 @@ obj-y += misc-hypercalls.o
 obj-y += mm.o
 obj-y += ro-page-fault.o
 obj-$(CONFIG_PV_SHIM) += shim.o
+obj-$(CONFIG_TRACEBUFFER) += trace.o
 obj-y += traps.o
 
 obj-bin-y += dom0_build.init.o

xen/arch/x86/pv/emul-inv-op.c

@@ -19,7 +19,7 @@
  * along with this program; If not, see <http://www.gnu.org/licenses/>.
  */
 
-#include <xen/trace.h>
+#include <asm/pv/trace.h>
 
 #include "emulate.h"
 

xen/arch/x86/pv/emul-priv-op.c

@@ -30,6 +30,7 @@
 #include <asm/hypercall.h>
 #include <asm/mc146818rtc.h>
 #include <asm/pv/domain.h>
+#include <asm/pv/trace.h>
 #include <asm/shared.h>
 
 #include <xsm/xsm.h>

xen/arch/x86/pv/ro-page-fault.c

@@ -20,7 +20,7 @@
  * along with this program; If not, see <http://www.gnu.org/licenses/>.
  */
 
-#include <xen/trace.h>
+#include <asm/pv/trace.h>
 #include <asm/shadow.h>
 
 #include "emulate.h"

xen/arch/x86/pv/trace.c

@@ -1,9 +1,6 @@
-#include <xen/init.h>
-#include <xen/kernel.h>
-#include <xen/lib.h>
-#include <xen/domain.h>
 #include <xen/sched.h>
-#include <xen/trace.h>
+
+#include <asm/pv/trace.h>
 
 void __trace_pv_trap(int trapnr, unsigned long eip,
                      int use_error_code, unsigned error_code)
@@ -21,7 +18,7 @@ void __trace_pv_trap(int trapnr, unsigned long eip,
         d.trapnr = trapnr;
         d.error_code = error_code;
         d.use_error_code=!!use_error_code;
-                
+
         __trace_var(TRC_PV_TRAP, 1, sizeof(d), &d);
     }
     else
@@ -38,7 +35,7 @@ void __trace_pv_trap(int trapnr, unsigned long eip,
         d.trapnr = trapnr;
         d.error_code = error_code;
         d.use_error_code=!!use_error_code;
-                
+
         event = TRC_PV_TRAP;
         event |= TRC_64_FLAG;
         __trace_var(event, 1, sizeof(d), &d);
@@ -58,7 +55,7 @@ void __trace_pv_page_fault(unsigned long addr, unsigned error_code)
         d.eip = eip;
         d.addr = addr;
         d.error_code = error_code;
-                
+
         __trace_var(TRC_PV_PAGE_FAULT, 1, sizeof(d), &d);
     }
     else

xen/arch/x86/pv/traps.c

@@ -22,10 +22,10 @@
 #include <xen/event.h>
 #include <xen/hypercall.h>
 #include <xen/lib.h>
-#include <xen/trace.h>
 #include <xen/softirq.h>
 
 #include <asm/apic.h>
+#include <asm/pv/trace.h>
 #include <asm/shared.h>
 #include <asm/traps.h>
 #include <irq_vectors.h>

xen/arch/x86/traps.c

@@ -82,6 +82,7 @@
 #include <xsm/xsm.h>
 #include <asm/mach-default/irq_vectors.h>
 #include <asm/pv/traps.h>
+#include <asm/pv/trace.h>
 #include <asm/pv/mm.h>
 
 /*
@@ -1480,7 +1481,7 @@ static int fixup_page_fault(unsigned long addr, struct cpu_user_regs *regs)
     {
         int ret = paging_fault(addr, regs);
 
-        if ( ret == EXCRET_fault_fixed )
+        if ( IS_ENABLED(CONFIG_PV) && ret == EXCRET_fault_fixed )
             trace_trap_two_addr(TRC_PV_PAGING_FIXUP, regs->rip, addr);
         return ret;
     }

xen/include/asm-x86/pv/trace.h

@@ -0,0 +1,48 @@
+#ifndef XEN_X86_PV_TRACE_H
+#define XEN_X86_PV_TRACE_H
+
+#include <xen/trace.h>
+
+#include <asm/page.h>
+
+void __trace_pv_trap(int trapnr, unsigned long eip,
+                     int use_error_code, unsigned error_code);
+static inline void trace_pv_trap(int trapnr, unsigned long eip,
+                                 int use_error_code, unsigned error_code)
+{
+    if ( unlikely(tb_init_done) )
+        __trace_pv_trap(trapnr, eip, use_error_code, error_code);
+}
+
+void __trace_pv_page_fault(unsigned long addr, unsigned error_code);
+static inline void trace_pv_page_fault(unsigned long addr,
+                                       unsigned error_code)
+{
+    if ( unlikely(tb_init_done) )
+        __trace_pv_page_fault(addr, error_code);
+}
+
+void __trace_trap_one_addr(unsigned event, unsigned long va);
+static inline void trace_trap_one_addr(unsigned event, unsigned long va)
+{
+    if ( unlikely(tb_init_done) )
+        __trace_trap_one_addr(event, va);
+}
+
+void __trace_trap_two_addr(unsigned event, unsigned long va1,
+                           unsigned long va2);
+static inline void trace_trap_two_addr(unsigned event, unsigned long va1,
+                                       unsigned long va2)
+{
+    if ( unlikely(tb_init_done) )
+        __trace_trap_two_addr(event, va1, va2);
+}
+
+void __trace_ptwr_emulation(unsigned long addr, l1_pgentry_t npte);
+static inline void trace_ptwr_emulation(unsigned long addr, l1_pgentry_t npte)
+{
+    if ( unlikely(tb_init_done) )
+        __trace_ptwr_emulation(addr, npte);
+}
+
+#endif /* XEN_X86_PV_TRACE_H */

xen/include/asm-x86/trace.h

@@ -1,46 +1,4 @@
 #ifndef __ASM_TRACE_H__
 #define __ASM_TRACE_H__
 
-#include <asm/page.h>
-
-void __trace_pv_trap(int trapnr, unsigned long eip,
-                     int use_error_code, unsigned error_code);
-static inline void trace_pv_trap(int trapnr, unsigned long eip,
-                                 int use_error_code, unsigned error_code)
-{
-    if ( unlikely(tb_init_done) )
-        __trace_pv_trap(trapnr, eip, use_error_code, error_code);
-}
-
-void __trace_pv_page_fault(unsigned long addr, unsigned error_code);
-static inline void trace_pv_page_fault(unsigned long addr,
-                                       unsigned error_code)
-{
-    if ( unlikely(tb_init_done) )
-        __trace_pv_page_fault(addr, error_code);
-}
-
-void __trace_trap_one_addr(unsigned event, unsigned long va);
-static inline void trace_trap_one_addr(unsigned event, unsigned long va)
-{
-    if ( unlikely(tb_init_done) )
-        __trace_trap_one_addr(event, va);
-}
-
-void __trace_trap_two_addr(unsigned event, unsigned long va1,
-                           unsigned long va2);
-static inline void trace_trap_two_addr(unsigned event, unsigned long va1,
-                                       unsigned long va2)
-{
-    if ( unlikely(tb_init_done) )
-        __trace_trap_two_addr(event, va1, va2);
-}
-
-void __trace_ptwr_emulation(unsigned long addr, l1_pgentry_t npte);
-static inline void trace_ptwr_emulation(unsigned long addr, l1_pgentry_t npte)
-{
-    if ( unlikely(tb_init_done) )
-        __trace_ptwr_emulation(addr, npte);
-}
-
 #endif /* __ASM_TRACE_H__ */