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

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Date:   Wed, 27 May 2020 20:11:21 -0700
From:   Sean Christopherson <sean.j.christopherson@...el.com>
To:     Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        x86@...nel.org, Paolo Bonzini <pbonzini@...hat.com>
Cc:     "H. Peter Anvin" <hpa@...or.com>,
        Sean Christopherson <sean.j.christopherson@...el.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: [PATCH] x86/kvm: Remove defunct KVM_DEBUG_FS Kconfig

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>
-- 
2.26.0