x86: move patching code to arch-specific file.

The core patching code for paravirt is sufficiently different
among i386 and x86_64, and we move them to specific files.

Signed-off-by: Glauber de Oliveira Costa <gcosta@redhat.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

arch/x86/kernel/Makefile_32

@@ -48,7 +48,7 @@ obj-$(CONFIG_K8_NB)		+= k8.o
 obj-$(CONFIG_MGEODE_LX)		+= geode_32.o mfgpt_32.o
 
 obj-$(CONFIG_VMI)		+= vmi_32.o vmiclock_32.o
-obj-$(CONFIG_PARAVIRT)		+= paravirt.o
+obj-$(CONFIG_PARAVIRT)		+= paravirt.o paravirt_patch_32.o
 obj-y				+= pcspeaker.o
 
 obj-$(CONFIG_SCx200)		+= scx200_32.o

arch/x86/kernel/paravirt.c

@@ -58,59 +58,9 @@ char *memory_setup(void)
 	extern const char start_##ops##_##name[], end_##ops##_##name[];	\
 	asm("start_" #ops "_" #name ": " code "; end_" #ops "_" #name ":")
 
-DEF_NATIVE(pv_irq_ops, irq_disable, "cli");
-DEF_NATIVE(pv_irq_ops, irq_enable, "sti");
-DEF_NATIVE(pv_irq_ops, restore_fl, "push %eax; popf");
-DEF_NATIVE(pv_irq_ops, save_fl, "pushf; pop %eax");
-DEF_NATIVE(pv_cpu_ops, iret, "iret");
-DEF_NATIVE(pv_cpu_ops, irq_enable_syscall_ret, "sti; sysexit");
-DEF_NATIVE(pv_mmu_ops, read_cr2, "mov %cr2, %eax");
-DEF_NATIVE(pv_mmu_ops, write_cr3, "mov %eax, %cr3");
-DEF_NATIVE(pv_mmu_ops, read_cr3, "mov %cr3, %eax");
-DEF_NATIVE(pv_cpu_ops, clts, "clts");
-DEF_NATIVE(pv_cpu_ops, read_tsc, "rdtsc");
-
 /* Undefined instruction for dealing with missing ops pointers. */
 static const unsigned char ud2a[] = { 0x0f, 0x0b };
 
-static unsigned native_patch(u8 type, u16 clobbers, void *ibuf,
-			     unsigned long addr, unsigned len)
-{
-	const unsigned char *start, *end;
-	unsigned ret;
-
-	switch(type) {
-#define SITE(ops, x)						\
-	case PARAVIRT_PATCH(ops.x):				\
-		start = start_##ops##_##x;			\
-		end = end_##ops##_##x;				\
-		goto patch_site
-
-	SITE(pv_irq_ops, irq_disable);
-	SITE(pv_irq_ops, irq_enable);
-	SITE(pv_irq_ops, restore_fl);
-	SITE(pv_irq_ops, save_fl);
-	SITE(pv_cpu_ops, iret);
-	SITE(pv_cpu_ops, irq_enable_syscall_ret);
-	SITE(pv_mmu_ops, read_cr2);
-	SITE(pv_mmu_ops, read_cr3);
-	SITE(pv_mmu_ops, write_cr3);
-	SITE(pv_cpu_ops, clts);
-	SITE(pv_cpu_ops, read_tsc);
-#undef SITE
-
-	patch_site:
-		ret = paravirt_patch_insns(ibuf, len, start, end);
-		break;
-
-	default:
-		ret = paravirt_patch_default(type, clobbers, ibuf, addr, len);
-		break;
-	}
-
-	return ret;
-}
-
 unsigned paravirt_patch_nop(void)
 {
 	return 0;

arch/x86/kernel/paravirt_patch_32.c

@@ -0,0 +1,49 @@
+#include <asm/paravirt.h>
+
+DEF_NATIVE(pv_irq_ops, irq_disable, "cli");
+DEF_NATIVE(pv_irq_ops, irq_enable, "sti");
+DEF_NATIVE(pv_irq_ops, restore_fl, "push %eax; popf");
+DEF_NATIVE(pv_irq_ops, save_fl, "pushf; pop %eax");
+DEF_NATIVE(pv_cpu_ops, iret, "iret");
+DEF_NATIVE(pv_cpu_ops, irq_enable_syscall_ret, "sti; sysexit");
+DEF_NATIVE(pv_mmu_ops, read_cr2, "mov %cr2, %eax");
+DEF_NATIVE(pv_mmu_ops, write_cr3, "mov %eax, %cr3");
+DEF_NATIVE(pv_mmu_ops, read_cr3, "mov %cr3, %eax");
+DEF_NATIVE(pv_cpu_ops, clts, "clts");
+DEF_NATIVE(pv_cpu_ops, read_tsc, "rdtsc");
+
+unsigned native_patch(u8 type, u16 clobbers, void *ibuf,
+		      unsigned long addr, unsigned len)
+{
+	const unsigned char *start, *end;
+	unsigned ret;
+
+#define PATCH_SITE(ops, x)					\
+		case PARAVIRT_PATCH(ops.x):			\
+			start = start_##ops##_##x;		\
+			end = end_##ops##_##x;			\
+			goto patch_site
+	switch(type) {
+		PATCH_SITE(pv_irq_ops, irq_disable);
+		PATCH_SITE(pv_irq_ops, irq_enable);
+		PATCH_SITE(pv_irq_ops, restore_fl);
+		PATCH_SITE(pv_irq_ops, save_fl);
+		PATCH_SITE(pv_cpu_ops, iret);
+		PATCH_SITE(pv_cpu_ops, irq_enable_syscall_ret);
+		PATCH_SITE(pv_mmu_ops, read_cr2);
+		PATCH_SITE(pv_mmu_ops, read_cr3);
+		PATCH_SITE(pv_mmu_ops, write_cr3);
+		PATCH_SITE(pv_cpu_ops, clts);
+		PATCH_SITE(pv_cpu_ops, read_tsc);
+
+	patch_site:
+		ret = paravirt_patch_insns(ibuf, len, start, end);
+		break;
+
+	default:
+		ret = paravirt_patch_default(type, clobbers, ibuf, addr, len);
+		break;
+	}
+#undef PATCH_SITE
+	return ret;
+}

include/asm-x86/paravirt.h

@@ -308,6 +308,11 @@ extern struct pv_mmu_ops pv_mmu_ops;
 #define paravirt_alt(insn_string)					\
 	_paravirt_alt(insn_string, "%c[paravirt_typenum]", "%c[paravirt_clobber]")
 
+/* Simple instruction patching code. */
+#define DEF_NATIVE(ops, name, code) 					\
+	extern const char start_##ops##_##name[], end_##ops##_##name[];	\
+	asm("start_" #ops "_" #name ": " code "; end_" #ops "_" #name ":")
+
 unsigned paravirt_patch_nop(void);
 unsigned paravirt_patch_ignore(unsigned len);
 unsigned paravirt_patch_call(void *insnbuf,
@@ -322,6 +327,9 @@ unsigned paravirt_patch_default(u8 type, u16 clobbers, void *insnbuf,
 unsigned paravirt_patch_insns(void *insnbuf, unsigned len,
 			      const char *start, const char *end);
 
+unsigned native_patch(u8 type, u16 clobbers, void *ibuf,
+		      unsigned long addr, unsigned len);
+
 int paravirt_disable_iospace(void);
 
 /*