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Date: Wed, 6 Jun 2012 16:06:51 -0400
From: Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
To: Borislav Petkov <bp@...64.org>
Cc: "H. Peter Anvin" <hpa@...or.com>, Jacob Shin <jacob.shin@....com>,
Andre Przywara <andre.przywara@....com>, jeremy@...p.org,
xen-devel@...ts.xensource.com, LKML <linux-kernel@...r.kernel.org>,
Jan Beulich <JBeulich@...e.com>,
Ingo Molnar <mingo@...nel.org>,
Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [PATCH 1/4] x86, pvops: Remove hooks for {rd,wr}msr_safe_regs
On Fri, Jun 01, 2012 at 04:52:35PM +0200, Borislav Petkov wrote:
> From: Andre Przywara <andre.przywara@....com>
>
> 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: Andre Przywara <andre.przywara@....com>
Acked-by: Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
> ---
> arch/x86/include/asm/msr.h | 67 ++++++++++++++-------------------
> arch/x86/include/asm/paravirt.h | 39 -------------------
> arch/x86/include/asm/paravirt_types.h | 2 -
> arch/x86/kernel/paravirt.c | 2 -
> arch/x86/lib/msr-reg-export.c | 4 +-
> arch/x86/lib/msr-reg.S | 10 ++---
> arch/x86/xen/enlighten.c | 2 -
> 7 files changed, 35 insertions(+), 91 deletions(-)
>
> diff --git a/arch/x86/include/asm/msr.h b/arch/x86/include/asm/msr.h
> index 084ef95274cd..81860cc012d1 100644
> --- a/arch/x86/include/asm/msr.h
> +++ b/arch/x86/include/asm/msr.h
> @@ -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))
> diff --git a/arch/x86/include/asm/paravirt.h b/arch/x86/include/asm/paravirt.h
> index 6cbbabf52707..ebb0cdb60a89 100644
> --- a/arch/x86/include/asm/paravirt.h
> +++ b/arch/x86/include/asm/paravirt.h
> @@ -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)
> {
> diff --git a/arch/x86/include/asm/paravirt_types.h b/arch/x86/include/asm/paravirt_types.h
> index 8e8b9a4987ee..8613cbb7ba41 100644
> --- a/arch/x86/include/asm/paravirt_types.h
> +++ b/arch/x86/include/asm/paravirt_types.h
> @@ -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);
> diff --git a/arch/x86/kernel/paravirt.c b/arch/x86/kernel/paravirt.c
> index 9ce885996fd7..17fff18a1031 100644
> --- a/arch/x86/kernel/paravirt.c
> +++ b/arch/x86/kernel/paravirt.c
> @@ -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,
> diff --git a/arch/x86/lib/msr-reg-export.c b/arch/x86/lib/msr-reg-export.c
> index a311cc59b65d..8d6ef78b5d01 100644
> --- a/arch/x86/lib/msr-reg-export.c
> +++ b/arch/x86/lib/msr-reg-export.c
> @@ -1,5 +1,5 @@
> #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);
> diff --git a/arch/x86/lib/msr-reg.S b/arch/x86/lib/msr-reg.S
> index 69fa10623f21..f6d13eefad10 100644
> --- a/arch/x86/lib/msr-reg.S
> +++ b/arch/x86/lib/msr-reg.S
> @@ -6,13 +6,13 @@
>
> #ifdef CONFIG_X86_64
> /*
> - * int native_{rdmsr,wrmsr}_safe_regs(u32 gprs[8]);
> + * int {rdmsr,wrmsr}_safe_regs(u32 gprs[8]);
> *
> * reg layout: u32 gprs[eax, ecx, edx, ebx, esp, ebp, esi, edi]
> *
> */
> .macro op_safe_regs op
> -ENTRY(native_\op\()_safe_regs)
> +ENTRY(\op\()_safe_regs)
> CFI_STARTPROC
> pushq_cfi %rbx
> pushq_cfi %rbp
> @@ -45,13 +45,13 @@ ENTRY(native_\op\()_safe_regs)
>
> _ASM_EXTABLE(1b, 3b)
> CFI_ENDPROC
> -ENDPROC(native_\op\()_safe_regs)
> +ENDPROC(\op\()_safe_regs)
> .endm
>
> #else /* X86_32 */
>
> .macro op_safe_regs op
> -ENTRY(native_\op\()_safe_regs)
> +ENTRY(\op\()_safe_regs)
> CFI_STARTPROC
> pushl_cfi %ebx
> pushl_cfi %ebp
> @@ -92,7 +92,7 @@ ENTRY(native_\op\()_safe_regs)
>
> _ASM_EXTABLE(1b, 3b)
> CFI_ENDPROC
> -ENDPROC(native_\op\()_safe_regs)
> +ENDPROC(\op\()_safe_regs)
> .endm
>
> #endif
> diff --git a/arch/x86/xen/enlighten.c b/arch/x86/xen/enlighten.c
> index e74df9548a02..60f1131eb94f 100644
> --- a/arch/x86/xen/enlighten.c
> +++ b/arch/x86/xen/enlighten.c
> @@ -1116,9 +1116,7 @@ static const struct pv_cpu_ops xen_cpu_ops __initconst = {
> .wbinvd = native_wbinvd,
>
> .read_msr = native_read_msr_safe,
> - .rdmsr_regs = native_rdmsr_safe_regs,
> .write_msr = xen_write_msr_safe,
> - .wrmsr_regs = native_wrmsr_safe_regs,
>
> .read_tsc = native_read_tsc,
> .read_pmc = native_read_pmc,
> --
> 1.7.9.3.362.g71319
--
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