linux-kernel - Re: [PATCH] x86/Centaur: show more HW features in /proc/cpuinfo

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Date:   Mon, 9 Apr 2018 13:19:15 +0800
From:   David Wang <davidwang@...oxin.com>
To:     <tglx@...utronix.de>, <mingo@...hat.com>, <hpa@...or.com>,
        <mingo@...nel.org>, <gregkh@...uxfoundation.org>, <x86@...nel.org>,
        <linux-kernel@...r.kernel.org>
CC:     <brucechang@...-alliance.com>, <cooperyan@...oxin.com>,
        <qiyuanwang@...oxin.com>, <benjaminpan@...tech.com>,
        <lukelin@...cpu.com>, <timguo@...oxin.com>
Subject: Re: [PATCH] x86/Centaur: show more HW features in /proc/cpuinfo

> -----邮件原件-----
> 发件人: David Wang [mailto:davidwang@...oxin.com]
> 发送时间: 2018年4月8日 17:36
> 收件人: tglx@...utronix.de; mingo@...hat.com; hpa@...or.com;
> mingo@...nel.org; grehkg@...uxfoundation.org; x86@...nel.org;
> linux-kernel@...r.kernel.org
> 抄送: brucechang@...-alliance.com; cooperyan@...oxin.com;
> qiyuanwang@...oxin.com; benjaminpan@...tech.com; lukelin@...cpu.com;
> timguo@...oxin.com; David Wang <davidwang@...oxin.com>
> 主题: [PATCH] x86/Centaur: show more HW features in /proc/cpuinfo
> 
> We add this patch to show correct HW features(arch_perfmon, tpr_shadow,
> vnmi, flexpriority, ept and vpid) when user execute "cat /proc/cpuinfo".
> 
> Signed-off-by: David Wang <davidwang@...oxin.com>
> ---
>  arch/x86/kernel/cpu/centaur.c | 49
> +++++++++++++++++++++++++++++++++++++++++++
>  1 file changed, 49 insertions(+)
> 
> diff --git a/arch/x86/kernel/cpu/centaur.c b/arch/x86/kernel/cpu/centaur.c
> index e5ec0f1..969fb8f 100644
> --- a/arch/x86/kernel/cpu/centaur.c
> +++ b/arch/x86/kernel/cpu/centaur.c
> @@ -112,6 +112,44 @@ static void early_init_centaur(struct cpuinfo_x86 *c)
>  	}
>  }
> 
> +static void centaur_detect_vmx_virtcap(struct cpuinfo_x86 *c) {
> +#define X86_VMX_FEATURE_PROC_CTLS_TPR_SHADOW	0x00200000
> +#define X86_VMX_FEATURE_PROC_CTLS_VNMI		0x00400000
> +#define X86_VMX_FEATURE_PROC_CTLS_2ND_CTLS	0x80000000
> +#define X86_VMX_FEATURE_PROC_CTLS2_VIRT_APIC	0x00000001
> +#define X86_VMX_FEATURE_PROC_CTLS2_EPT		0x00000002
> +#define X86_VMX_FEATURE_PROC_CTLS2_VPID		0x00000020
> +
> +	u32 vmx_msr_low, vmx_msr_high, msr_ctl, msr_ctl2;
> +
> +	clear_cpu_cap(c, X86_FEATURE_TPR_SHADOW);
> +	clear_cpu_cap(c, X86_FEATURE_VNMI);
> +	clear_cpu_cap(c, X86_FEATURE_FLEXPRIORITY);
> +	clear_cpu_cap(c, X86_FEATURE_EPT);
> +	clear_cpu_cap(c, X86_FEATURE_VPID);
> +
> +	rdmsr(MSR_IA32_VMX_PROCBASED_CTLS, vmx_msr_low, vmx_msr_high);
> +	msr_ctl = vmx_msr_high | vmx_msr_low;
> +
> +	if (msr_ctl & X86_VMX_FEATURE_PROC_CTLS_TPR_SHADOW)
> +		set_cpu_cap(c, X86_FEATURE_TPR_SHADOW);
> +	if (msr_ctl & X86_VMX_FEATURE_PROC_CTLS_VNMI)
> +		set_cpu_cap(c, X86_FEATURE_VNMI);
> +	if (msr_ctl & X86_VMX_FEATURE_PROC_CTLS_2ND_CTLS) {
> +		rdmsr(MSR_IA32_VMX_PROCBASED_CTLS2,
> +		      vmx_msr_low, vmx_msr_high);
> +		msr_ctl2 = vmx_msr_high | vmx_msr_low;
> +		if ((msr_ctl2 & X86_VMX_FEATURE_PROC_CTLS2_VIRT_APIC) &&
> +		    (msr_ctl & X86_VMX_FEATURE_PROC_CTLS_TPR_SHADOW))
> +			set_cpu_cap(c, X86_FEATURE_FLEXPRIORITY);
> +		if (msr_ctl2 & X86_VMX_FEATURE_PROC_CTLS2_EPT)
> +			set_cpu_cap(c, X86_FEATURE_EPT);
> +		if (msr_ctl2 & X86_VMX_FEATURE_PROC_CTLS2_VPID)
> +			set_cpu_cap(c, X86_FEATURE_VPID);
> +	}
> +}
> +
>  static void init_centaur(struct cpuinfo_x86 *c)  {  #ifdef CONFIG_X86_32
> @@ -128,6 +166,14 @@ static void init_centaur(struct cpuinfo_x86 *c)
>  	clear_cpu_cap(c, 0*32+31);
>  #endif
>  	early_init_centaur(c);
> +
> +	if (c->cpuid_level > 9) {
> +		unsigned eax = cpuid_eax(10);
> +		/* Check for version and the number of counters */
> +		if ((eax & 0xff) && (((eax >> 8) & 0xff) > 1))
> +			set_cpu_cap(c, X86_FEATURE_ARCH_PERFMON);
> +	}
> +
>  	switch (c->x86) {
>  #ifdef CONFIG_X86_32
>  	case 5:
> @@ -199,6 +245,9 @@ static void init_centaur(struct cpuinfo_x86 *c)
#ifdef
> CONFIG_X86_64
>  	set_cpu_cap(c, X86_FEATURE_LFENCE_RDTSC);  #endif
> +
> +	if (cpu_has(c, X86_FEATURE_VMX))
> +		centaur_detect_vmx_virtcap(c);
>  }
> 
>  #ifdef CONFIG_X86_32
> --
> 1.9.1

Sorry to send to wrong email address.
---
David