From 2c929ce6f1ed1302be225512b433e6a6554f71a4 Mon Sep 17 00:00:00 2001 From: Borislav Petkov Date: Fri, 1 Jun 2012 16:52:38 +0200 Subject: [PATCH] x86, cpu, amd: Deprecate AMD-specific MSR variants Now that all users of {rd,wr}msr_amd_safe have been fixed, deprecate its use by making them private to amd.c and adding warnings when used on anything else beside K8. Signed-off-by: Borislav Petkov Link: http://lkml.kernel.org/r/1338562358-28182-5-git-send-email-bp@amd64.org Acked-by: Konrad Rzeszutek Wilk Signed-off-by: H. Peter Anvin --- arch/x86/include/asm/msr.h | 27 --------------------------- arch/x86/kernel/cpu/amd.c | 33 +++++++++++++++++++++++++++++++++ 2 files changed, 33 insertions(+), 27 deletions(-) diff --git a/arch/x86/include/asm/msr.h b/arch/x86/include/asm/msr.h index 81860cc012d1..cb33b5f00267 100644 --- a/arch/x86/include/asm/msr.h +++ b/arch/x86/include/asm/msr.h @@ -211,33 +211,6 @@ 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)) diff --git a/arch/x86/kernel/cpu/amd.c b/arch/x86/kernel/cpu/amd.c index 80ccd99542e6..c928eb26ada6 100644 --- a/arch/x86/kernel/cpu/amd.c +++ b/arch/x86/kernel/cpu/amd.c @@ -19,6 +19,39 @@ #include "cpu.h" +static inline int rdmsrl_amd_safe(unsigned msr, unsigned long long *p) +{ + struct cpuinfo_x86 *c = &cpu_data(smp_processor_id()); + u32 gprs[8] = { 0 }; + int err; + + WARN_ONCE((c->x86 != 0xf), "%s should only be used on K8!\n", __func__); + + 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) +{ + struct cpuinfo_x86 *c = &cpu_data(smp_processor_id()); + u32 gprs[8] = { 0 }; + + WARN_ONCE((c->x86 != 0xf), "%s should only be used on K8!\n", __func__); + + gprs[0] = (u32)val; + gprs[1] = msr; + gprs[2] = val >> 32; + gprs[7] = 0x9c5a203a; + + return wrmsr_safe_regs(gprs); +} + #ifdef CONFIG_X86_32 /* * B step AMD K6 before B 9730xxxx have hardware bugs that can cause -- GitLab