Commit 27876f38 authored by Juergen Gross's avatar Juergen Gross Committed by Thomas Gleixner
Browse files

x86/paravirt: Remove clobbers from struct paravirt_patch_site 



There is no need any longer to store the clobbers in struct
paravirt_patch_site. Remove clobbers from the struct and from the
related macros.

While at it fix some lines longer than 80 characters.

Signed-off-by: default avatarJuergen Gross <jgross@suse.com>
Signed-off-by: default avatarThomas Gleixner <tglx@linutronix.de>
Reviewed-by: default avatarThomas 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/20180828074026.820-8-jgross@suse.com
parent abc745f8

arch/x86/include/asm/paravirt.h

+15 −18
Original line number Diff line number Diff line
@@ -827,7 +827,7 @@ extern void default_banner(void); 


#else  /* __ASSEMBLY__ */



#define _PVSITE(ptype, clobbers, ops, word, algn)	\

#define _PVSITE(ptype, ops, word, algn)		\

771:;						\

	ops;					\

772:;						\
@@ -836,7 +836,6 @@ extern void default_banner(void); 
	 word 771b;				\

	 .byte ptype;				\

	 .byte 772b-771b;			\

	 .short clobbers;			\

	.popsection
@@ -869,7 +868,7 @@ extern void default_banner(void); 
	COND_POP(set, CLBR_RAX, rax)



#define PARA_PATCH(struct, off)        ((PARAVIRT_PATCH_##struct + (off)) / 8)

#define PARA_SITE(ptype, clobbers, ops) _PVSITE(ptype, clobbers, ops, .quad, 8)

#define PARA_SITE(ptype, ops)	_PVSITE(ptype, ops, .quad, 8)

#define PARA_INDIRECT(addr)	*addr(%rip)

#else

#define PV_SAVE_REGS(set)			\
@@ -884,24 +883,24 @@ extern void default_banner(void); 
	COND_POP(set, CLBR_EAX, eax)



#define PARA_PATCH(struct, off)        ((PARAVIRT_PATCH_##struct + (off)) / 4)

#define PARA_SITE(ptype, clobbers, ops) _PVSITE(ptype, clobbers, ops, .long, 4)

#define PARA_SITE(ptype, ops)	_PVSITE(ptype, ops, .long, 4)

#define PARA_INDIRECT(addr)	*%cs:addr

#endif



#define INTERRUPT_RETURN						\

	PARA_SITE(PARA_PATCH(pv_cpu_ops, PV_CPU_iret), CLBR_NONE,	\

	PARA_SITE(PARA_PATCH(pv_cpu_ops, PV_CPU_iret),			\

		  ANNOTATE_RETPOLINE_SAFE;				\

		  jmp PARA_INDIRECT(pv_cpu_ops+PV_CPU_iret);)



#define DISABLE_INTERRUPTS(clobbers)					\

	PARA_SITE(PARA_PATCH(pv_irq_ops, PV_IRQ_irq_disable), clobbers, \

	PARA_SITE(PARA_PATCH(pv_irq_ops, PV_IRQ_irq_disable),		\

		  PV_SAVE_REGS(clobbers | CLBR_CALLEE_SAVE);		\

		  ANNOTATE_RETPOLINE_SAFE;				\

		  call PARA_INDIRECT(pv_irq_ops+PV_IRQ_irq_disable);	\

		  PV_RESTORE_REGS(clobbers | CLBR_CALLEE_SAVE);)



#define ENABLE_INTERRUPTS(clobbers)					\

	PARA_SITE(PARA_PATCH(pv_irq_ops, PV_IRQ_irq_enable), clobbers,	\

	PARA_SITE(PARA_PATCH(pv_irq_ops, PV_IRQ_irq_enable),		\

		  PV_SAVE_REGS(clobbers | CLBR_CALLEE_SAVE);		\

		  ANNOTATE_RETPOLINE_SAFE;				\

		  call PARA_INDIRECT(pv_irq_ops+PV_IRQ_irq_enable);	\
@@ -921,8 +920,7 @@ extern void default_banner(void); 
 * inlined, or the swapgs instruction must be trapped and emulated.

 */

#define SWAPGS_UNSAFE_STACK						\

	PARA_SITE(PARA_PATCH(pv_cpu_ops, PV_CPU_swapgs), CLBR_NONE,	\

		  swapgs)

	PARA_SITE(PARA_PATCH(pv_cpu_ops, PV_CPU_swapgs), swapgs)



/*

 * Note: swapgs is very special, and in practise is either going to be
@@ -931,7 +929,7 @@ extern void default_banner(void); 
 * it.

 */

#define SWAPGS								\

	PARA_SITE(PARA_PATCH(pv_cpu_ops, PV_CPU_swapgs), CLBR_NONE,	\

	PARA_SITE(PARA_PATCH(pv_cpu_ops, PV_CPU_swapgs),		\

		  ANNOTATE_RETPOLINE_SAFE;				\

		  call PARA_INDIRECT(pv_cpu_ops+PV_CPU_swapgs);		\

		 )
@@ -942,13 +940,12 @@ extern void default_banner(void); 


#define USERGS_SYSRET64							\

	PARA_SITE(PARA_PATCH(pv_cpu_ops, PV_CPU_usergs_sysret64),	\

		  CLBR_NONE,						\

		  ANNOTATE_RETPOLINE_SAFE;				\

		  jmp PARA_INDIRECT(pv_cpu_ops+PV_CPU_usergs_sysret64);)



#ifdef CONFIG_DEBUG_ENTRY

#define SAVE_FLAGS(clobbers)                                        \

	PARA_SITE(PARA_PATCH(pv_irq_ops, PV_IRQ_save_fl), clobbers, \

	PARA_SITE(PARA_PATCH(pv_irq_ops, PV_IRQ_save_fl),	    \

		  PV_SAVE_REGS(clobbers | CLBR_CALLEE_SAVE);        \

		  ANNOTATE_RETPOLINE_SAFE;			    \

		  call PARA_INDIRECT(pv_irq_ops+PV_IRQ_save_fl);    \

arch/x86/include/asm/paravirt_types.h

+0 −1
Original line number Diff line number Diff line
@@ -681,7 +681,6 @@ struct paravirt_patch_site { 
	u8 *instr; 		/* original instructions */

	u8 instrtype;		/* type of this instruction */

	u8 len;			/* length of original instruction */

	u16 clobbers;		/* what registers you may clobber */

};



extern struct paravirt_patch_site __parainstructions[],

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