linux-kernel - Re: [PATCH] x86: Print amd virtualization features in /proc/cpuinfo

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Date:	Wed, 9 Sep 2009 18:16:43 +0200
From:	Joerg Roedel <joerg.roedel@....com>
To:	Ingo Molnar <mingo@...hat.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	"H. Peter Anvin" <hpa@...or.com>
CC:	x86@...nel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] x86: Print amd virtualization features in /proc/cpuinfo

Hi Ingo,

do you have any objections against this patch? Please let me know so I
can fix them.

Thanks,

	Joerg

On Tue, Aug 11, 2009 at 03:18:52PM +0200, Joerg Roedel wrote:
> This patch adds code to cpu initialization path to detect the extended
> virtualization features of AMD cpus and shows them in /proc/cpuinfo.
> 
> Signed-off-by: Joerg Roedel <joerg.roedel@....com>
> ---
>  arch/x86/include/asm/cpufeature.h |    5 +++++
>  arch/x86/kernel/cpu/amd.c         |   25 +++++++++++++++++++++++++
>  2 files changed, 30 insertions(+), 0 deletions(-)
> 
> diff --git a/arch/x86/include/asm/cpufeature.h b/arch/x86/include/asm/cpufeature.h
> index 4a28d22..d3218e3 100644
> --- a/arch/x86/include/asm/cpufeature.h
> +++ b/arch/x86/include/asm/cpufeature.h
> @@ -165,6 +165,11 @@
>  #define X86_FEATURE_FLEXPRIORITY (8*32+ 2) /* Intel FlexPriority */
>  #define X86_FEATURE_EPT         (8*32+ 3) /* Intel Extended Page Table */
>  #define X86_FEATURE_VPID        (8*32+ 4) /* Intel Virtual Processor ID */
> +#define X86_FEATURE_NPT		(8*32+5)  /* AMD Nested Page Table support */
> +#define X86_FEATURE_LBRV	(8*32+6)  /* LBR Virtualization support */
> +#define X86_FEATURE_SVML	(8*32+7)  /* "svm_lock" SVM locking MSR */
> +#define X86_FEATURE_NRIPS	(8*32+8)  /* "nrip_save" svm next_rip save */
> +
>  
>  #if defined(__KERNEL__) && !defined(__ASSEMBLY__)
>  
> diff --git a/arch/x86/kernel/cpu/amd.c b/arch/x86/kernel/cpu/amd.c
> index ec6c7a8..ac567d4 100644
> --- a/arch/x86/kernel/cpu/amd.c
> +++ b/arch/x86/kernel/cpu/amd.c
> @@ -367,6 +367,28 @@ static void __cpuinit early_init_amd(struct cpuinfo_x86 *c)
>  #endif
>  }
>  
> +static void __cpuinit detect_amd_virt_flags(struct cpuinfo_x86 *c)
> +{
> +
> +#define SVM_FEATURE_NPT_MASK   0x00000001
> +#define SVM_FEATURE_LBRV_MASK  0x00000002
> +#define SVM_FEATURE_SVML_MASK  0x00000004
> +#define SVM_FEATURE_NRIPS_MASK 0x00000008
> +
> +	u32 virt_flags;
> +
> +	virt_flags = cpuid_edx(0x8000000A);
> +
> +	if (virt_flags & SVM_FEATURE_NPT_MASK)
> +		set_cpu_cap(c,  X86_FEATURE_NPT);
> +	if (virt_flags & SVM_FEATURE_LBRV_MASK)
> +		set_cpu_cap(c,  X86_FEATURE_LBRV);
> +	if (virt_flags & SVM_FEATURE_SVML_MASK)
> +		set_cpu_cap(c,  X86_FEATURE_SVML);
> +	if (virt_flags & SVM_FEATURE_NRIPS_MASK)
> +		set_cpu_cap(c,  X86_FEATURE_NRIPS);
> +}
> +
>  static void __cpuinit init_amd(struct cpuinfo_x86 *c)
>  {
>  #ifdef CONFIG_SMP
> @@ -499,6 +521,9 @@ static void __cpuinit init_amd(struct cpuinfo_x86 *c)
>  		}
>  	}
>  #endif
> +
> +	if (cpu_has(c, X86_FEATURE_SVM))
> +		detect_amd_virt_flags(c);
>  }
>  
>  #ifdef CONFIG_X86_32
> -- 
> 1.6.3.3
> 

-- 

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