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SubjectRe: [PATCH] x86/Centaur: show more HW features in /proc/cpuinfo
Date
> -----邮件原件-----
> 发件人: David Wang [mailto:davidwang@zhaoxin.com]
> 发送时间: 2018年4月8日 17:36
> 收件人: tglx@linutronix.de; mingo@redhat.com; hpa@zytor.com;
> mingo@kernel.org; grehkg@linuxfoundation.org; x86@kernel.org;
> linux-kernel@vger.kernel.org
> 抄送: brucechang@via-alliance.com; cooperyan@zhaoxin.com;
> qiyuanwang@zhaoxin.com; benjaminpan@viatech.com; lukelin@viacpu.com;
> timguo@zhaoxin.com; David Wang <davidwang@zhaoxin.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@zhaoxin.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



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