Commit 1f975f78 authored by Andre Przywara's avatar Andre Przywara Committed by H. Peter Anvin
Browse files

x86, pvops: Remove hooks for {rd,wr}msr_safe_regs 



There were paravirt_ops hooks for the full register set variant of
{rd,wr}msr_safe which are actually not used by anyone anymore. Remove
them to make the code cleaner and avoid silent breakages when the pvops
members were uninitialized. This has been boot-tested natively and under
Xen with PVOPS enabled and disabled on one machine.

Signed-off-by: default avatarAndre Przywara <andre.przywara@amd.com>
Link: http://lkml.kernel.org/r/1338562358-28182-2-git-send-email-bp@amd64.org


Acked-by: default avatarKonrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Signed-off-by: default avatarH. Peter Anvin <hpa@zytor.com>
parent f8f5701b

arch/x86/include/asm/msr.h

+28 −39
Original line number Diff line number Diff line
@@ -115,8 +115,8 @@ notrace static inline int native_write_msr_safe(unsigned int msr, 


extern unsigned long long native_read_tsc(void);



extern int native_rdmsr_safe_regs(u32 regs[8]);

extern int native_wrmsr_safe_regs(u32 regs[8]);

extern int rdmsr_safe_regs(u32 regs[8]);

extern int wrmsr_safe_regs(u32 regs[8]);



static __always_inline unsigned long long __native_read_tsc(void)

{
@@ -187,43 +187,6 @@ static inline int rdmsrl_safe(unsigned msr, unsigned long long *p) 
	return err;

}



static inline int rdmsrl_amd_safe(unsigned msr, unsigned long long *p)

{

	u32 gprs[8] = { 0 };

	int err;



	gprs[1] = msr;

	gprs[7] = 0x9c5a203a;



	err = native_rdmsr_safe_regs(gprs);



	*p = gprs[0] | ((u64)gprs[2] << 32);



	return err;

}



static inline int wrmsrl_amd_safe(unsigned msr, unsigned long long val)

{

	u32 gprs[8] = { 0 };



	gprs[0] = (u32)val;

	gprs[1] = msr;

	gprs[2] = val >> 32;

	gprs[7] = 0x9c5a203a;



	return native_wrmsr_safe_regs(gprs);

}



static inline int rdmsr_safe_regs(u32 regs[8])

{

	return native_rdmsr_safe_regs(regs);

}



static inline int wrmsr_safe_regs(u32 regs[8])

{

	return native_wrmsr_safe_regs(regs);

}



#define rdtscl(low)						\

	((low) = (u32)__native_read_tsc())
@@ -248,6 +211,32 @@ do { \ 


#endif	/* !CONFIG_PARAVIRT */



static inline int rdmsrl_amd_safe(unsigned msr, unsigned long long *p)

{

	u32 gprs[8] = { 0 };

	int err;



	gprs[1] = msr;

	gprs[7] = 0x9c5a203a;



	err = rdmsr_safe_regs(gprs);



	*p = gprs[0] | ((u64)gprs[2] << 32);



	return err;

}



static inline int wrmsrl_amd_safe(unsigned msr, unsigned long long val)

{

	u32 gprs[8] = { 0 };



	gprs[0] = (u32)val;

	gprs[1] = msr;

	gprs[2] = val >> 32;

	gprs[7] = 0x9c5a203a;



	return wrmsr_safe_regs(gprs);

}



#define checking_wrmsrl(msr, val) wrmsr_safe((msr), (u32)(val),		\

					     (u32)((val) >> 32))

arch/x86/include/asm/paravirt.h

+0 −39
Original line number Diff line number Diff line
@@ -128,21 +128,11 @@ static inline u64 paravirt_read_msr(unsigned msr, int *err) 
	return PVOP_CALL2(u64, pv_cpu_ops.read_msr, msr, err);

}



static inline int paravirt_rdmsr_regs(u32 *regs)

{

	return PVOP_CALL1(int, pv_cpu_ops.rdmsr_regs, regs);

}



static inline int paravirt_write_msr(unsigned msr, unsigned low, unsigned high)

{

	return PVOP_CALL3(int, pv_cpu_ops.write_msr, msr, low, high);

}



static inline int paravirt_wrmsr_regs(u32 *regs)

{

	return PVOP_CALL1(int, pv_cpu_ops.wrmsr_regs, regs);

}



/* These should all do BUG_ON(_err), but our headers are too tangled. */

#define rdmsr(msr, val1, val2)			\

do {						\
@@ -176,9 +166,6 @@ do { \ 
	_err;					\

})



#define rdmsr_safe_regs(regs)	paravirt_rdmsr_regs(regs)

#define wrmsr_safe_regs(regs)	paravirt_wrmsr_regs(regs)



static inline int rdmsrl_safe(unsigned msr, unsigned long long *p)

{

	int err;
@@ -186,32 +173,6 @@ static inline int rdmsrl_safe(unsigned msr, unsigned long long *p) 
	*p = paravirt_read_msr(msr, &err);

	return err;

}

static inline int rdmsrl_amd_safe(unsigned msr, unsigned long long *p)

{

	u32 gprs[8] = { 0 };

	int err;



	gprs[1] = msr;

	gprs[7] = 0x9c5a203a;



	err = paravirt_rdmsr_regs(gprs);



	*p = gprs[0] | ((u64)gprs[2] << 32);



	return err;

}



static inline int wrmsrl_amd_safe(unsigned msr, unsigned long long val)

{

	u32 gprs[8] = { 0 };



	gprs[0] = (u32)val;

	gprs[1] = msr;

	gprs[2] = val >> 32;

	gprs[7] = 0x9c5a203a;



	return paravirt_wrmsr_regs(gprs);

}



static inline u64 paravirt_read_tsc(void)

{

arch/x86/include/asm/paravirt_types.h

+0 −2
Original line number Diff line number Diff line
@@ -153,9 +153,7 @@ struct pv_cpu_ops { 
	/* MSR, PMC and TSR operations.

	   err = 0/-EFAULT.  wrmsr returns 0/-EFAULT. */

	u64 (*read_msr)(unsigned int msr, int *err);

	int (*rdmsr_regs)(u32 *regs);

	int (*write_msr)(unsigned int msr, unsigned low, unsigned high);

	int (*wrmsr_regs)(u32 *regs);



	u64 (*read_tsc)(void);

	u64 (*read_pmc)(int counter);

arch/x86/kernel/paravirt.c

+0 −2
Original line number Diff line number Diff line
@@ -352,9 +352,7 @@ struct pv_cpu_ops pv_cpu_ops = { 
#endif

	.wbinvd = native_wbinvd,

	.read_msr = native_read_msr_safe,

	.rdmsr_regs = native_rdmsr_safe_regs,

	.write_msr = native_write_msr_safe,

	.wrmsr_regs = native_wrmsr_safe_regs,

	.read_tsc = native_read_tsc,

	.read_pmc = native_read_pmc,

	.read_tscp = native_read_tscp,

arch/x86/lib/msr-reg-export.c

+2 −2
Original line number Diff line number Diff line 
#include <linux/module.h>

#include <asm/msr.h>



EXPORT_SYMBOL(native_rdmsr_safe_regs);

EXPORT_SYMBOL(native_wrmsr_safe_regs);
 
EXPORT_SYMBOL(rdmsr_safe_regs);

EXPORT_SYMBOL(wrmsr_safe_regs);

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