x86/paravirt: Move the Xen-only pv_cpu_ops under the PARAVIRT_XXL umbrella

Most of the paravirt ops defined in pv_cpu_ops are for Xen PV guests
only. Define them only if CONFIG_PARAVIRT_XXL is set.

Signed-off-by: Juergen Gross <jgross@suse.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: xen-devel@lists.xenproject.org
Cc: virtualization@lists.linux-foundation.org
Cc: akataria@vmware.com
Cc: rusty@rustcorp.com.au
Cc: boris.ostrovsky@oracle.com
Cc: hpa@zytor.com
Link: https://lkml.kernel.org/r/20180828074026.820-13-jgross@suse.com

7 files changed, 28 insertions, 3 deletions

diff --git a/arch/x86/kernel/asm-offsets.c b/arch/x86/kernel/asm-offsets.c
index 37e323f3d8c9..0fe233d98d17 100644
--- a/arch/x86/kernel/asm-offsets.c
+++ b/arch/x86/kernel/asm-offsets.c
@@ -68,7 +68,9 @@ void common(void) {
 	BLANK();
 	OFFSET(PV_IRQ_irq_disable, paravirt_patch_template, irq.irq_disable);
 	OFFSET(PV_IRQ_irq_enable, paravirt_patch_template, irq.irq_enable);
+#ifdef CONFIG_PARAVIRT_XXL
 	OFFSET(PV_CPU_iret, paravirt_patch_template, cpu.iret);
+#endif
 	OFFSET(PV_MMU_read_cr2, paravirt_patch_template, mmu.read_cr2);
 #endif
 
diff --git a/arch/x86/kernel/asm-offsets_64.c b/arch/x86/kernel/asm-offsets_64.c
index 3384b03e717f..2a15d420a84d 100644
--- a/arch/x86/kernel/asm-offsets_64.c
+++ b/arch/x86/kernel/asm-offsets_64.c
@@ -21,9 +21,11 @@ static char syscalls_ia32[] = {
 int main(void)
 {
 #ifdef CONFIG_PARAVIRT
+#ifdef CONFIG_PARAVIRT_XXL
 	OFFSET(PV_CPU_usergs_sysret64, paravirt_patch_template,
 	       cpu.usergs_sysret64);
 	OFFSET(PV_CPU_swapgs, paravirt_patch_template, cpu.swapgs);
+#endif
 #ifdef CONFIG_DEBUG_ENTRY
 	OFFSET(PV_IRQ_save_fl, paravirt_patch_template, irq.save_fl);
 #endif
diff --git a/arch/x86/kernel/cpu/common.c b/arch/x86/kernel/cpu/common.c
index c4da9c23a96c..d45cd5e0fb11 100644
--- a/arch/x86/kernel/cpu/common.c
+++ b/arch/x86/kernel/cpu/common.c
@@ -1240,7 +1240,7 @@ static void generic_identify(struct cpuinfo_x86 *c)
 	 * ESPFIX issue, we can change this.
 	 */
 #ifdef CONFIG_X86_32
-# ifdef CONFIG_PARAVIRT
+# ifdef CONFIG_PARAVIRT_XXL
 	do {
 		extern void native_iret(void);
 		if (pv_ops.cpu.iret == native_iret)
diff --git a/arch/x86/kernel/head_64.S b/arch/x86/kernel/head_64.S
index 15ebc2fc166e..a5bd72a0ee1a 100644
--- a/arch/x86/kernel/head_64.S
+++ b/arch/x86/kernel/head_64.S
@@ -31,6 +31,8 @@
 #define GET_CR2_INTO(reg) GET_CR2_INTO_RAX ; movq %rax, reg
 #else
 #define GET_CR2_INTO(reg) movq %cr2, reg
+#endif
+#ifndef CONFIG_PARAVIRT_XXL
 #define INTERRUPT_RETURN iretq
 #endif
 
diff --git a/arch/x86/kernel/paravirt.c b/arch/x86/kernel/paravirt.c
index ce0e28506942..1d5f40cc872a 100644
--- a/arch/x86/kernel/paravirt.c
+++ b/arch/x86/kernel/paravirt.c
@@ -101,6 +101,7 @@ static unsigned paravirt_patch_call(void *insnbuf, const void *target,
 	return 5;
 }
 
+#ifdef CONFIG_PARAVIRT_XXL
 static unsigned paravirt_patch_jmp(void *insnbuf, const void *target,
 				   unsigned long addr, unsigned len)
 {
@@ -119,6 +120,7 @@ static unsigned paravirt_patch_jmp(void *insnbuf, const void *target,
 
 	return 5;
 }
+#endif
 
 DEFINE_STATIC_KEY_TRUE(virt_spin_lock_key);
 
@@ -150,10 +152,12 @@ unsigned paravirt_patch_default(u8 type, void *insnbuf,
 	else if (opfunc == _paravirt_ident_64)
 		ret = paravirt_patch_ident_64(insnbuf, len);
 
+#ifdef CONFIG_PARAVIRT_XXL
 	else if (type == PARAVIRT_PATCH(cpu.iret) ||
 		 type == PARAVIRT_PATCH(cpu.usergs_sysret64))
 		/* If operation requires a jmp, then jmp */
 		ret = paravirt_patch_jmp(insnbuf, opfunc, addr, len);
+#endif
 	else
 		/* Otherwise call the function. */
 		ret = paravirt_patch_call(insnbuf, opfunc, addr, len);
@@ -262,6 +266,7 @@ void paravirt_flush_lazy_mmu(void)
 	preempt_enable();
 }
 
+#ifdef CONFIG_PARAVIRT_XXL
 void paravirt_start_context_switch(struct task_struct *prev)
 {
 	BUG_ON(preemptible());
@@ -282,6 +287,7 @@ void paravirt_end_context_switch(struct task_struct *next)
 	if (test_and_clear_ti_thread_flag(task_thread_info(next), TIF_LAZY_MMU_UPDATES))
 		arch_enter_lazy_mmu_mode();
 }
+#endif
 
 enum paravirt_lazy_mode paravirt_get_lazy_mode(void)
 {
@@ -320,6 +326,9 @@ struct paravirt_patch_template pv_ops = {
 	.time.steal_clock	= native_steal_clock,
 
 	/* Cpu ops. */
+	.cpu.io_delay		= native_io_delay,
+
+#ifdef CONFIG_PARAVIRT_XXL
 	.cpu.cpuid		= native_cpuid,
 	.cpu.get_debugreg	= native_get_debugreg,
 	.cpu.set_debugreg	= native_set_debugreg,
@@ -361,10 +370,10 @@ struct paravirt_patch_template pv_ops = {
 	.cpu.swapgs		= native_swapgs,
 
 	.cpu.set_iopl_mask	= native_set_iopl_mask,
-	.cpu.io_delay		= native_io_delay,
 
 	.cpu.start_context_switch	= paravirt_nop,
 	.cpu.end_context_switch		= paravirt_nop,
+#endif /* CONFIG_PARAVIRT_XXL */
 
 	/* Irq ops. */
 	.irq.save_fl		= __PV_IS_CALLEE_SAVE(native_save_fl),
@@ -464,10 +473,12 @@ struct paravirt_patch_template pv_ops = {
 #endif
 };
 
+#ifdef CONFIG_PARAVIRT_XXL
 /* At this point, native_get/set_debugreg has real function entries */
 NOKPROBE_SYMBOL(native_get_debugreg);
 NOKPROBE_SYMBOL(native_set_debugreg);
 NOKPROBE_SYMBOL(native_load_idt);
+#endif
 
 EXPORT_SYMBOL_GPL(pv_ops);
 EXPORT_SYMBOL_GPL(pv_info);
diff --git a/arch/x86/kernel/paravirt_patch_32.c b/arch/x86/kernel/paravirt_patch_32.c
index 026fa43e9261..5a20aa56efc0 100644
--- a/arch/x86/kernel/paravirt_patch_32.c
+++ b/arch/x86/kernel/paravirt_patch_32.c
@@ -5,7 +5,9 @@ DEF_NATIVE(irq, irq_disable, "cli");
 DEF_NATIVE(irq, irq_enable, "sti");
 DEF_NATIVE(irq, restore_fl, "push %eax; popf");
 DEF_NATIVE(irq, save_fl, "pushf; pop %eax");
+#ifdef CONFIG_PARAVIRT_XXL
 DEF_NATIVE(cpu, iret, "iret");
+#endif
 DEF_NATIVE(mmu, read_cr2, "mov %cr2, %eax");
 DEF_NATIVE(mmu, write_cr3, "mov %eax, %cr3");
 DEF_NATIVE(mmu, read_cr3, "mov %cr3, %eax");
@@ -45,7 +47,9 @@ unsigned native_patch(u8 type, void *ibuf, unsigned long addr, unsigned len)
 		PATCH_SITE(irq, irq_enable);
 		PATCH_SITE(irq, restore_fl);
 		PATCH_SITE(irq, save_fl);
+#ifdef CONFIG_PARAVIRT_XXL
 		PATCH_SITE(cpu, iret);
+#endif
 		PATCH_SITE(mmu, read_cr2);
 		PATCH_SITE(mmu, read_cr3);
 		PATCH_SITE(mmu, write_cr3);
diff --git a/arch/x86/kernel/paravirt_patch_64.c b/arch/x86/kernel/paravirt_patch_64.c
index 582e893728e8..461aba038ada 100644
--- a/arch/x86/kernel/paravirt_patch_64.c
+++ b/arch/x86/kernel/paravirt_patch_64.c
@@ -10,10 +10,12 @@ DEF_NATIVE(irq, save_fl, "pushfq; popq %rax");
 DEF_NATIVE(mmu, read_cr2, "movq %cr2, %rax");
 DEF_NATIVE(mmu, read_cr3, "movq %cr3, %rax");
 DEF_NATIVE(mmu, write_cr3, "movq %rdi, %cr3");
+#ifdef CONFIG_PARAVIRT_XXL
 DEF_NATIVE(cpu, wbinvd, "wbinvd");
 
 DEF_NATIVE(cpu, usergs_sysret64, "swapgs; sysretq");
 DEF_NATIVE(cpu, swapgs, "swapgs");
+#endif
 
 DEF_NATIVE(, mov32, "mov %edi, %eax");
 DEF_NATIVE(, mov64, "mov %rdi, %rax");
@@ -53,12 +55,14 @@ unsigned native_patch(u8 type, void *ibuf, unsigned long addr, unsigned len)
 		PATCH_SITE(irq, save_fl);
 		PATCH_SITE(irq, irq_enable);
 		PATCH_SITE(irq, irq_disable);
+#ifdef CONFIG_PARAVIRT_XXL
 		PATCH_SITE(cpu, usergs_sysret64);
 		PATCH_SITE(cpu, swapgs);
+		PATCH_SITE(cpu, wbinvd);
+#endif
 		PATCH_SITE(mmu, read_cr2);
 		PATCH_SITE(mmu, read_cr3);
 		PATCH_SITE(mmu, write_cr3);
-		PATCH_SITE(cpu, wbinvd);
 #if defined(CONFIG_PARAVIRT_SPINLOCKS)
 		case PARAVIRT_PATCH(lock.queued_spin_unlock):
 			if (pv_is_native_spin_unlock()) {