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[Xen-devel] [PATCH v2 08/11] 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@xxxxxxxx>
---
 arch/x86/include/asm/debugreg.h       |  2 +-
 arch/x86/include/asm/desc.h           |  4 ++--
 arch/x86/include/asm/irqflags.h       | 16 +++++++++++-----
 arch/x86/include/asm/msr.h            |  4 ++--
 arch/x86/include/asm/paravirt.h       | 15 +++++++++++++--
 arch/x86/include/asm/paravirt_types.h |  5 ++++-
 arch/x86/include/asm/pgtable.h        |  6 ++++--
 arch/x86/include/asm/processor.h      |  4 ++--
 arch/x86/include/asm/special_insns.h  |  9 +++++++--
 arch/x86/kernel/asm-offsets.c         |  2 ++
 arch/x86/kernel/asm-offsets_64.c      |  2 ++
 arch/x86/kernel/cpu/common.c          |  2 +-
 arch/x86/kernel/head_64.S             |  2 ++
 arch/x86/kernel/paravirt.c            | 13 ++++++++++++-
 arch/x86/kernel/paravirt_patch_32.c   |  4 ++++
 arch/x86/kernel/paravirt_patch_64.c   |  6 +++++-
 16 files changed, 74 insertions(+), 22 deletions(-)

diff --git a/arch/x86/include/asm/debugreg.h b/arch/x86/include/asm/debugreg.h
index 4505ac2735ad..9e5ca30738e5 100644
--- a/arch/x86/include/asm/debugreg.h
+++ b/arch/x86/include/asm/debugreg.h
@@ -8,7 +8,7 @@
 
 DECLARE_PER_CPU(unsigned long, cpu_dr7);
 
-#ifndef CONFIG_PARAVIRT
+#ifndef CONFIG_PARAVIRT_XXL
 /*
  * These special macros can be used to get or set a debugging register
  */
diff --git a/arch/x86/include/asm/desc.h b/arch/x86/include/asm/desc.h
index 13c5ee878a47..68a99d2a5f33 100644
--- a/arch/x86/include/asm/desc.h
+++ b/arch/x86/include/asm/desc.h
@@ -108,7 +108,7 @@ static inline int desc_empty(const void *ptr)
        return !(desc[0] | desc[1]);
 }
 
-#ifdef CONFIG_PARAVIRT
+#ifdef CONFIG_PARAVIRT_XXL
 #include <asm/paravirt.h>
 #else
 #define load_TR_desc()                         native_load_tr_desc()
@@ -134,7 +134,7 @@ static inline void paravirt_alloc_ldt(struct desc_struct 
*ldt, unsigned entries)
 static inline void paravirt_free_ldt(struct desc_struct *ldt, unsigned entries)
 {
 }
-#endif /* CONFIG_PARAVIRT */
+#endif /* CONFIG_PARAVIRT_XXL */
 
 #define store_ldt(ldt) asm("sldt %0" : "=m"(ldt))
 
diff --git a/arch/x86/include/asm/irqflags.h b/arch/x86/include/asm/irqflags.h
index b7a790d03229..03bb451e4e6b 100644
--- a/arch/x86/include/asm/irqflags.h
+++ b/arch/x86/include/asm/irqflags.h
@@ -120,6 +120,16 @@ static inline notrace unsigned long 
arch_local_irq_save(void)
 #define DISABLE_INTERRUPTS(x)  cli
 
 #ifdef CONFIG_X86_64
+#ifdef CONFIG_DEBUG_ENTRY
+#define SAVE_FLAGS(x)          pushfq; popq %rax
+#endif
+#endif
+#endif /* __ASSEMBLY__ */
+#endif /* CONFIG_PARAVIRT */
+
+#ifndef CONFIG_PARAVIRT_XXL
+#ifdef __ASSEMBLY__
+#ifdef CONFIG_X86_64
 #define SWAPGS swapgs
 /*
  * Currently paravirt can't handle swapgs nicely when we
@@ -140,16 +150,12 @@ static inline notrace unsigned long 
arch_local_irq_save(void)
        swapgs;                                 \
        sysretl
 
-#ifdef CONFIG_DEBUG_ENTRY
-#define SAVE_FLAGS(x)          pushfq; popq %rax
-#endif
 #else
 #define INTERRUPT_RETURN               iret
 #endif
 
-
 #endif /* __ASSEMBLY__ */
-#endif /* CONFIG_PARAVIRT */
+#endif /* CONFIG_PARAVIRT_XXL */
 
 #ifndef __ASSEMBLY__
 static inline int arch_irqs_disabled_flags(unsigned long flags)
diff --git a/arch/x86/include/asm/msr.h b/arch/x86/include/asm/msr.h
index 04addd6e0a4a..91e4cf189914 100644
--- a/arch/x86/include/asm/msr.h
+++ b/arch/x86/include/asm/msr.h
@@ -242,7 +242,7 @@ static inline unsigned long long native_read_pmc(int 
counter)
        return EAX_EDX_VAL(val, low, high);
 }
 
-#ifdef CONFIG_PARAVIRT
+#ifdef CONFIG_PARAVIRT_XXL
 #include <asm/paravirt.h>
 #else
 #include <linux/errno.h>
@@ -305,7 +305,7 @@ do {                                                        
\
 
 #define rdpmcl(counter, val) ((val) = native_read_pmc(counter))
 
-#endif /* !CONFIG_PARAVIRT */
+#endif /* !CONFIG_PARAVIRT_XXL */
 
 /*
  * 64-bit version of wrmsr_safe():
diff --git a/arch/x86/include/asm/paravirt.h b/arch/x86/include/asm/paravirt.h
index 4f27e33245c9..7ce17f361503 100644
--- a/arch/x86/include/asm/paravirt.h
+++ b/arch/x86/include/asm/paravirt.h
@@ -17,6 +17,7 @@
 #include <linux/cpumask.h>
 #include <asm/frame.h>
 
+#ifdef CONFIG_PARAVIRT_XXL
 static inline void load_sp0(unsigned long sp0)
 {
        PVOP_VCALL1(cpu.load_sp0, sp0);
@@ -51,6 +52,7 @@ static inline void write_cr0(unsigned long x)
 {
        PVOP_VCALL1(cpu.write_cr0, x);
 }
+#endif
 
 static inline unsigned long read_cr2(void)
 {
@@ -72,6 +74,7 @@ static inline void write_cr3(unsigned long x)
        PVOP_VCALL1(mmu.write_cr3, x);
 }
 
+#ifdef CONFIG_PARAVIRT_XXL
 static inline void __write_cr4(unsigned long x)
 {
        PVOP_VCALL1(cpu.write_cr4, x);
@@ -88,6 +91,7 @@ static inline void write_cr8(unsigned long x)
        PVOP_VCALL1(cpu.write_cr8, x);
 }
 #endif
+#endif
 
 static inline void arch_safe_halt(void)
 {
@@ -99,14 +103,13 @@ static inline void halt(void)
        PVOP_VCALL0(irq.halt);
 }
 
+#ifdef CONFIG_PARAVIRT_XXL
 static inline void wbinvd(void)
 {
        PVOP_VCALL0(cpu.wbinvd);
 }
 
-#ifdef CONFIG_PARAVIRT_XXL
 #define get_kernel_rpl()  (pv_info.kernel_rpl)
-#endif
 
 static inline u64 paravirt_read_msr(unsigned msr)
 {
@@ -171,6 +174,7 @@ static inline int rdmsrl_safe(unsigned msr, unsigned long 
long *p)
        *p = paravirt_read_msr_safe(msr, &err);
        return err;
 }
+#endif
 
 static inline unsigned long long paravirt_sched_clock(void)
 {
@@ -186,6 +190,7 @@ static inline u64 paravirt_steal_clock(int cpu)
        return PVOP_CALL1(u64, time.steal_clock, cpu);
 }
 
+#ifdef CONFIG_PARAVIRT_XXL
 static inline unsigned long long paravirt_read_pmc(int counter)
 {
        return PVOP_CALL1(u64, cpu.read_pmc, counter);
@@ -230,6 +235,7 @@ static inline unsigned long paravirt_store_tr(void)
 {
        return PVOP_CALL0(unsigned long, cpu.store_tr);
 }
+
 #define store_tr(tr)   ((tr) = paravirt_store_tr())
 static inline void load_TLS(struct thread_struct *t, unsigned cpu)
 {
@@ -263,6 +269,7 @@ static inline void set_iopl_mask(unsigned mask)
 {
        PVOP_VCALL1(cpu.set_iopl_mask, mask);
 }
+#endif
 
 /* The paravirtualized I/O functions */
 static inline void slow_down_io(void)
@@ -613,6 +620,7 @@ static inline void pmd_clear(pmd_t *pmdp)
 }
 #endif /* CONFIG_X86_PAE */
 
+#ifdef CONFIG_PARAVIRT_XXL
 #define  __HAVE_ARCH_START_CONTEXT_SWITCH
 static inline void arch_start_context_switch(struct task_struct *prev)
 {
@@ -623,6 +631,7 @@ static inline void arch_end_context_switch(struct 
task_struct *next)
 {
        PVOP_VCALL1(cpu.end_context_switch, next);
 }
+#endif
 
 #define  __HAVE_ARCH_ENTER_LAZY_MMU_MODE
 static inline void arch_enter_lazy_mmu_mode(void)
@@ -865,10 +874,12 @@ extern void default_banner(void);
 #define PARA_INDIRECT(addr)    *%cs:addr
 #endif
 
+#ifdef CONFIG_PARAVIRT_XXL
 #define INTERRUPT_RETURN                                               \
        PARA_SITE(PARA_PATCH(PV_CPU_iret),                              \
                  ANNOTATE_RETPOLINE_SAFE;                              \
                  jmp PARA_INDIRECT(pv_ops+PV_CPU_iret);)
+#endif
 
 #define DISABLE_INTERRUPTS(clobbers)                                   \
        PARA_SITE(PARA_PATCH(PV_IRQ_irq_disable),                       \
diff --git a/arch/x86/include/asm/paravirt_types.h 
b/arch/x86/include/asm/paravirt_types.h
index c7b73953cea5..e652ec27d945 100644
--- a/arch/x86/include/asm/paravirt_types.h
+++ b/arch/x86/include/asm/paravirt_types.h
@@ -105,6 +105,9 @@ struct pv_time_ops {
 
 struct pv_cpu_ops {
        /* hooks for various privileged instructions */
+       void (*io_delay)(void);
+
+#ifdef CONFIG_PARAVIRT_XXL
        unsigned long (*get_debugreg)(int regno);
        void (*set_debugreg)(int regno, unsigned long value);
 
@@ -142,7 +145,6 @@ struct pv_cpu_ops {
        void (*set_iopl_mask)(unsigned mask);
 
        void (*wbinvd)(void);
-       void (*io_delay)(void);
 
        /* cpuid emulation, mostly so that caps bits can be disabled */
        void (*cpuid)(unsigned int *eax, unsigned int *ebx,
@@ -177,6 +179,7 @@ struct pv_cpu_ops {
 
        void (*start_context_switch)(struct task_struct *prev);
        void (*end_context_switch)(struct task_struct *next);
+#endif
 } __no_randomize_layout;
 
 struct pv_irq_ops {
diff --git a/arch/x86/include/asm/pgtable.h b/arch/x86/include/asm/pgtable.h
index 5715647fc4fe..9ea291fe7107 100644
--- a/arch/x86/include/asm/pgtable.h
+++ b/arch/x86/include/asm/pgtable.h
@@ -108,10 +108,12 @@ extern pmdval_t early_pmd_flags;
 #define pte_val(x)     native_pte_val(x)
 #define __pte(x)       native_make_pte(x)
 
-#define arch_end_context_switch(prev)  do {} while(0)
-
 #endif /* CONFIG_PARAVIRT */
 
+#ifndef CONFIG_PARAVIRT_XXL
+#define arch_end_context_switch(prev)  do {} while(0)
+#endif /* CONFIG_PARAVIRT_XXL */
+
 /*
  * The following only work if pte_present() is true.
  * Undefined behaviour if not..
diff --git a/arch/x86/include/asm/processor.h b/arch/x86/include/asm/processor.h
index cfd29ee8c3da..7a8fa57218c2 100644
--- a/arch/x86/include/asm/processor.h
+++ b/arch/x86/include/asm/processor.h
@@ -571,7 +571,7 @@ static inline bool on_thread_stack(void)
                               current_stack_pointer) < THREAD_SIZE;
 }
 
-#ifdef CONFIG_PARAVIRT
+#ifdef CONFIG_PARAVIRT_XXL
 #include <asm/paravirt.h>
 #else
 #define __cpuid                        native_cpuid
@@ -582,7 +582,7 @@ static inline void load_sp0(unsigned long sp0)
 }
 
 #define set_iopl_mask native_set_iopl_mask
-#endif /* CONFIG_PARAVIRT */
+#endif /* CONFIG_PARAVIRT_XXL */
 
 /* Free all resources held by a thread. */
 extern void release_thread(struct task_struct *);
diff --git a/arch/x86/include/asm/special_insns.h 
b/arch/x86/include/asm/special_insns.h
index 317fc59b512c..2aa6ce4bf159 100644
--- a/arch/x86/include/asm/special_insns.h
+++ b/arch/x86/include/asm/special_insns.h
@@ -143,8 +143,9 @@ static inline unsigned long __read_cr4(void)
 
 #ifdef CONFIG_PARAVIRT
 #include <asm/paravirt.h>
-#else
+#endif
 
+#ifndef CONFIG_PARAVIRT_XXL
 static inline unsigned long read_cr0(void)
 {
        return native_read_cr0();
@@ -154,7 +155,9 @@ static inline void write_cr0(unsigned long x)
 {
        native_write_cr0(x);
 }
+#endif
 
+#ifndef CONFIG_PARAVIRT
 static inline unsigned long read_cr2(void)
 {
        return native_read_cr2();
@@ -178,7 +181,9 @@ static inline void write_cr3(unsigned long x)
 {
        native_write_cr3(x);
 }
+#endif
 
+#ifndef CONFIG_PARAVIRT_XXL
 static inline void __write_cr4(unsigned long x)
 {
        native_write_cr4(x);
@@ -208,7 +213,7 @@ static inline void load_gs_index(unsigned selector)
 
 #endif
 
-#endif/* CONFIG_PARAVIRT */
+#endif/* CONFIG_PARAVIRT_XXL */
 
 static inline void clflush(volatile void *__p)
 {
diff --git a/arch/x86/kernel/asm-offsets.c b/arch/x86/kernel/asm-offsets.c
index 395253f582a5..5ea1be9d1819 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 82aebb83a41a..10a6eed14da5 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 3b046018865f..d497fb980ed7 100644
--- a/arch/x86/kernel/cpu/common.c
+++ b/arch/x86/kernel/cpu/common.c
@@ -1222,7 +1222,7 @@ 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 8344dd2f310a..e11b96b2dc6b 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 7604d223bd03..e4899f3252f1 100644
--- a/arch/x86/kernel/paravirt.c
+++ b/arch/x86/kernel/paravirt.c
@@ -100,6 +100,7 @@ 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)
 {
@@ -118,6 +119,7 @@ static unsigned paravirt_patch_jmp(void *insnbuf, const 
void *target,
 
        return 5;
 }
+#endif
 
 DEFINE_STATIC_KEY_TRUE(virt_spin_lock_key);
 
@@ -149,10 +151,12 @@ 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);
@@ -261,6 +265,7 @@ void paravirt_flush_lazy_mmu(void)
        preempt_enable();
 }
 
+#ifdef CONFIG_PARAVIRT_XXL
 void paravirt_start_context_switch(struct task_struct *prev)
 {
        BUG_ON(preemptible());
@@ -281,6 +286,7 @@ 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)
 {
@@ -319,6 +325,9 @@ 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,
@@ -360,10 +369,10 @@ 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
 
        /* Irq ops. */
        .irq.save_fl = __PV_IS_CALLEE_SAVE(native_save_fl),
@@ -460,10 +469,12 @@ 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 12424f7fb2c2..00030a15de35 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()) {
-- 
2.13.7


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