linux-kernel - Re: [RFC][PATCH 5/5] [PATCH 5/5] kvm-ept-idle: enable module

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Message-ID: <20180904191424.GC5869@linux.intel.com>
Date:   Tue, 4 Sep 2018 12:14:25 -0700
From:   Sean Christopherson <sean.j.christopherson@...el.com>
To:     Fengguang Wu <fengguang.wu@...el.com>
Cc:     Andrew Morton <akpm@...ux-foundation.org>,
        Linux Memory Management List <linux-mm@...ck.org>,
        Peng DongX <dongx.peng@...el.com>,
        Liu Jingqi <jingqi.liu@...el.com>,
        Dong Eddie <eddie.dong@...el.com>,
        Dave Hansen <dave.hansen@...el.com>,
        Huang Ying <ying.huang@...el.com>,
        Brendan Gregg <bgregg@...flix.com>, kvm@...r.kernel.org,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [RFC][PATCH 5/5] [PATCH 5/5] kvm-ept-idle: enable module

On Sat, Sep 01, 2018 at 07:28:23PM +0800, Fengguang Wu wrote:
> Signed-off-by: Fengguang Wu <fengguang.wu@...el.com>
> ---
>  arch/x86/kvm/Kconfig  | 11 +++++++++++
>  arch/x86/kvm/Makefile |  4 ++++
>  2 files changed, 15 insertions(+)
> 
> diff --git a/arch/x86/kvm/Kconfig b/arch/x86/kvm/Kconfig
> index 1bbec387d289..4c6dec47fac6 100644
> --- a/arch/x86/kvm/Kconfig
> +++ b/arch/x86/kvm/Kconfig
> @@ -96,6 +96,17 @@ config KVM_MMU_AUDIT
>  	 This option adds a R/W kVM module parameter 'mmu_audit', which allows
>  	 auditing of KVM MMU events at runtime.
>  
> +config KVM_EPT_IDLE
> +	tristate "KVM EPT idle page tracking"

KVM_MMU_IDLE_INTEL might be a more user friendly name, I doubt that
all Kconfig users would immediately associate EPT with Intel's two
dimensional paging.  And it meshes nicely with KVM_MMU_IDLE as a base
name if we ever want to move common functionality to its own module,
as well as all of the other KVM_MMU_* nomenclature.

> +	depends on KVM_INTEL
> +	depends on PROC_PAGE_MONITOR
> +	---help---
> +	  Provides support for walking EPT to get the A bits on Intel
> +	  processors equipped with the VT extensions.
> +
> +	  To compile this as a module, choose M here: the module
> +	  will be called kvm-ept-idle.
> +
>  # OK, it's a little counter-intuitive to do this, but it puts it neatly under
>  # the virtualization menu.
>  source drivers/vhost/Kconfig
> diff --git a/arch/x86/kvm/Makefile b/arch/x86/kvm/Makefile
> index dc4f2fdf5e57..5cad0590205d 100644
> --- a/arch/x86/kvm/Makefile
> +++ b/arch/x86/kvm/Makefile
> @@ -19,6 +19,10 @@ kvm-y			+= x86.o mmu.o emulate.o i8259.o irq.o lapic.o \
>  kvm-intel-y		+= vmx.o pmu_intel.o
>  kvm-amd-y		+= svm.o pmu_amd.o
>  
> +kvm-ept-idle-y		+= ept_idle.o
> +
>  obj-$(CONFIG_KVM)	+= kvm.o
>  obj-$(CONFIG_KVM_INTEL)	+= kvm-intel.o
>  obj-$(CONFIG_KVM_AMD)	+= kvm-amd.o
> +
> +obj-$(CONFIG_KVM_EPT_IDLE)	+= kvm-ept-idle.o
> -- 
> 2.15.0
> 
> 
>