linux-kernel - [PATCH 5.10 4/9] context_tracking: Move guest exit context tracking to separate helpers

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Date:   Thu, 27 May 2021 17:12:56 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Thomas Gleixner <tglx@...utronix.de>,
        Wanpeng Li <wanpengli@...cent.com>,
        Sean Christopherson <seanjc@...gle.com>
Subject: [PATCH 5.10 4/9] context_tracking: Move guest exit context tracking to separate helpers

From: Wanpeng Li <wanpengli@...cent.com>

commit 866a6dadbb027b2955a7ae00bab9705d382def12 upstream.

Provide separate context tracking helpers for guest exit, the standalone
helpers will be called separately by KVM x86 in later patches to fix
tick-based accounting.

Suggested-by: Thomas Gleixner <tglx@...utronix.de>
Signed-off-by: Wanpeng Li <wanpengli@...cent.com>
Co-developed-by: Sean Christopherson <seanjc@...gle.com>
Signed-off-by: Sean Christopherson <seanjc@...gle.com>
Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
Link: https://lore.kernel.org/r/20210505002735.1684165-2-seanjc@google.com
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 include/linux/context_tracking.h |    9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

--- a/include/linux/context_tracking.h
+++ b/include/linux/context_tracking.h
@@ -129,10 +129,15 @@ static __always_inline void guest_enter_
 	}
 }
 
-static __always_inline void guest_exit_irqoff(void)
+static __always_inline void context_tracking_guest_exit(void)
 {
 	if (context_tracking_enabled())
 		__context_tracking_exit(CONTEXT_GUEST);
+}
+
+static __always_inline void guest_exit_irqoff(void)
+{
+	context_tracking_guest_exit();
 
 	instrumentation_begin();
 	if (vtime_accounting_enabled_this_cpu())
@@ -157,6 +162,8 @@ static __always_inline void guest_enter_
 	instrumentation_end();
 }
 
+static __always_inline void context_tracking_guest_exit(void) { }
+
 static __always_inline void guest_exit_irqoff(void)
 {
 	instrumentation_begin();