linux-kernel - Re: [PATCH] x86/kvm: Remove defunct KVM_DEBUG

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Date:   Thu, 28 May 2020 13:56:26 +0200
From:   Paolo Bonzini <pbonzini@...hat.com>
To:     Sean Christopherson <sean.j.christopherson@...el.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        x86@...nel.org
Cc:     "H. Peter Anvin" <hpa@...or.com>,
        Vitaly Kuznetsov <vkuznets@...hat.com>,
        Wanpeng Li <wanpengli@...cent.com>,
        Jim Mattson <jmattson@...gle.com>,
        Joerg Roedel <joro@...tes.org>, linux-kernel@...r.kernel.org,
        kvm@...r.kernel.org
Subject: Re: [PATCH] x86/kvm: Remove defunct KVM_DEBUG_FS Kconfig

On 28/05/20 05:11, Sean Christopherson wrote:
> Remove KVM_DEBUG_FS, which can easily be misconstrued as controlling
> KVM-as-a-host.  The sole user of CONFIG_KVM_DEBUG_FS was removed by
> commit cfd8983f03c7b ("x86, locking/spinlocks: Remove ticket (spin)lock
> implementation").
> 
> Signed-off-by: Sean Christopherson <sean.j.christopherson@...el.com>
> ---
>  arch/x86/Kconfig      | 8 --------
>  arch/x86/kernel/kvm.c | 1 -
>  2 files changed, 9 deletions(-)
> 
> diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
> index 1197b5596d5ad..0ccf4e76acfe8 100644
> --- a/arch/x86/Kconfig
> +++ b/arch/x86/Kconfig
> @@ -818,14 +818,6 @@ config PVH
>  	  This option enables the PVH entry point for guest virtual machines
>  	  as specified in the x86/HVM direct boot ABI.
>  
> -config KVM_DEBUG_FS
> -	bool "Enable debug information for KVM Guests in debugfs"
> -	depends on KVM_GUEST && DEBUG_FS
> -	---help---
> -	  This option enables collection of various statistics for KVM guest.
> -	  Statistics are displayed in debugfs filesystem. Enabling this option
> -	  may incur significant overhead.
> -
>  config PARAVIRT_TIME_ACCOUNTING
>  	bool "Paravirtual steal time accounting"
>  	depends on PARAVIRT
> diff --git a/arch/x86/kernel/kvm.c b/arch/x86/kernel/kvm.c
> index 6efe0410fb728..89ba09228eaf5 100644
> --- a/arch/x86/kernel/kvm.c
> +++ b/arch/x86/kernel/kvm.c
> @@ -21,7 +21,6 @@
>  #include <linux/sched.h>
>  #include <linux/slab.h>
>  #include <linux/kprobes.h>
> -#include <linux/debugfs.h>
>  #include <linux/nmi.h>
>  #include <linux/swait.h>
>  #include <asm/timer.h>
> 

Queued, thanks.

Paolo