linux-kernel - [RFC PATCH 5/7] KVM: Move vtime accounting of guest exit to separate helper

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Date:   Tue, 13 Apr 2021 11:29:31 -0700
From:   Sean Christopherson <seanjc@...gle.com>
To:     Paolo Bonzini <pbonzini@...hat.com>
Cc:     Sean Christopherson <seanjc@...gle.com>,
        Vitaly Kuznetsov <vkuznets@...hat.com>,
        Wanpeng Li <wanpengli@...cent.com>,
        Jim Mattson <jmattson@...gle.com>,
        Joerg Roedel <joro@...tes.org>, kvm@...r.kernel.org,
        linux-kernel@...r.kernel.org, Thomas Gleixner <tglx@...utronix.de>,
        Christian Borntraeger <borntraeger@...ibm.com>,
        Michael Tokarev <mjt@....msk.ru>
Subject: [RFC PATCH 5/7] KVM: Move vtime accounting of guest exit to separate helper

Provide a standalone helper for guest exit vtime accounting so that x86
can defer tick-based accounting until the appropriate time, while still
updating context tracking immediately after VM-Exit.

No functional change intended.

Signed-off-by: Sean Christopherson <seanjc@...gle.com>
---
 include/linux/kvm_host.h | 11 ++++++++---
 1 file changed, 8 insertions(+), 3 deletions(-)

diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h
index 444d5f0225cb..20604bfae5a8 100644
--- a/include/linux/kvm_host.h
+++ b/include/linux/kvm_host.h
@@ -358,16 +358,21 @@ static __always_inline void guest_enter_irqoff(void)
 	}
 }
 
-static __always_inline void guest_exit_irqoff(void)
+static __always_inline void kvm_vtime_account_guest_exit(void)
 {
-	context_tracking_guest_exit_irqoff();
-
 	instrumentation_begin();
 	/* Flush the guest cputime we spent on the guest */
 	vtime_account_guest_exit();
 	instrumentation_end();
 }
 
+static __always_inline void guest_exit_irqoff(void)
+{
+	context_tracking_guest_exit_irqoff();
+
+	kvm_vtime_account_guest_exit();
+}
+
 static inline void guest_exit(void)
 {
 	unsigned long flags;
-- 
2.31.1.295.g9ea45b61b8-goog