[v3,2/9] context_tracking: Move guest exit vtime accounting to separate helpers
diff mbox series

Message ID 20210415222106.1643837-3-seanjc@google.com
State New, archived
Headers show
Series
  • KVM: Fix tick-based accounting for x86 guests
Related show

Commit Message

Sean Christopherson April 15, 2021, 10:20 p.m. UTC
From: Wanpeng Li <wanpengli@tencent.com>

Provide separate vtime accounting functions for guest exit instead of
open coding the logic within the context tracking code.  This will allow
KVM x86 to handle vtime accounting slightly differently when using
tick-based accounting.

Suggested-by: Thomas Gleixner <tglx@linutronix.de>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Michael Tokarev <mjt@tls.msk.ru>
Cc: Christian Borntraeger <borntraeger@de.ibm.com>
Signed-off-by: Wanpeng Li <wanpengli@tencent.com>
Co-developed-by: Sean Christopherson <seanjc@google.com>
Signed-off-by: Sean Christopherson <seanjc@google.com>
---
 include/linux/context_tracking.h | 24 +++++++++++++++++-------
 1 file changed, 17 insertions(+), 7 deletions(-)

Comments

Christian Borntraeger April 20, 2021, 6:48 p.m. UTC | #1
On 16.04.21 00:20, Sean Christopherson wrote:
> From: Wanpeng Li <wanpengli@tencent.com>
> 
> Provide separate vtime accounting functions for guest exit instead of
> open coding the logic within the context tracking code.  This will allow
> KVM x86 to handle vtime accounting slightly differently when using
> tick-based accounting.
> 
> Suggested-by: Thomas Gleixner <tglx@linutronix.de>
> Cc: Thomas Gleixner <tglx@linutronix.de>
> Cc: Michael Tokarev <mjt@tls.msk.ru>
> Cc: Christian Borntraeger <borntraeger@de.ibm.com>
> Signed-off-by: Wanpeng Li <wanpengli@tencent.com>
> Co-developed-by: Sean Christopherson <seanjc@google.com>
> Signed-off-by: Sean Christopherson <seanjc@google.com>

Reviewed-by: Christian Borntraeger <borntraeger@de.ibm.com>

> ---
>   include/linux/context_tracking.h | 24 +++++++++++++++++-------
>   1 file changed, 17 insertions(+), 7 deletions(-)
> 
> diff --git a/include/linux/context_tracking.h b/include/linux/context_tracking.h
> index 200d30cb3a82..7cf03a8e5708 100644
> --- a/include/linux/context_tracking.h
> +++ b/include/linux/context_tracking.h
> @@ -137,15 +137,20 @@ static __always_inline void context_tracking_guest_exit_irqoff(void)
>   		__context_tracking_exit(CONTEXT_GUEST);
>   }
>   
> -static __always_inline void guest_exit_irqoff(void)
> +static __always_inline void vtime_account_guest_exit(void)
>   {
> -	context_tracking_guest_exit_irqoff();
> -
> -	instrumentation_begin();
>   	if (vtime_accounting_enabled_this_cpu())
>   		vtime_guest_exit(current);
>   	else
>   		current->flags &= ~PF_VCPU;
> +}
> +
> +static __always_inline void guest_exit_irqoff(void)
> +{
> +	context_tracking_guest_exit_irqoff();
> +
> +	instrumentation_begin();
> +	vtime_account_guest_exit();
>   	instrumentation_end();
>   }
>   
> @@ -166,12 +171,17 @@ static __always_inline void guest_enter_irqoff(void)
>   
>   static __always_inline void context_tracking_guest_exit_irqoff(void) { }
>   
> -static __always_inline void guest_exit_irqoff(void)
> +static __always_inline void vtime_account_guest_exit(void)
>   {
> -	instrumentation_begin();
> -	/* Flush the guest cputime we spent on the guest */
>   	vtime_account_kernel(current);
>   	current->flags &= ~PF_VCPU;
> +}
> +
> +static __always_inline void guest_exit_irqoff(void)
> +{
> +	instrumentation_begin();
> +	/* Flush the guest cputime we spent on the guest */
> +	vtime_account_guest_exit();
>   	instrumentation_end();
>   }
>   #endif /* CONFIG_VIRT_CPU_ACCOUNTING_GEN */
>

Patch
diff mbox series

diff --git a/include/linux/context_tracking.h b/include/linux/context_tracking.h
index 200d30cb3a82..7cf03a8e5708 100644
--- a/include/linux/context_tracking.h
+++ b/include/linux/context_tracking.h
@@ -137,15 +137,20 @@  static __always_inline void context_tracking_guest_exit_irqoff(void)
 		__context_tracking_exit(CONTEXT_GUEST);
 }
 
-static __always_inline void guest_exit_irqoff(void)
+static __always_inline void vtime_account_guest_exit(void)
 {
-	context_tracking_guest_exit_irqoff();
-
-	instrumentation_begin();
 	if (vtime_accounting_enabled_this_cpu())
 		vtime_guest_exit(current);
 	else
 		current->flags &= ~PF_VCPU;
+}
+
+static __always_inline void guest_exit_irqoff(void)
+{
+	context_tracking_guest_exit_irqoff();
+
+	instrumentation_begin();
+	vtime_account_guest_exit();
 	instrumentation_end();
 }
 
@@ -166,12 +171,17 @@  static __always_inline void guest_enter_irqoff(void)
 
 static __always_inline void context_tracking_guest_exit_irqoff(void) { }
 
-static __always_inline void guest_exit_irqoff(void)
+static __always_inline void vtime_account_guest_exit(void)
 {
-	instrumentation_begin();
-	/* Flush the guest cputime we spent on the guest */
 	vtime_account_kernel(current);
 	current->flags &= ~PF_VCPU;
+}
+
+static __always_inline void guest_exit_irqoff(void)
+{
+	instrumentation_begin();
+	/* Flush the guest cputime we spent on the guest */
+	vtime_account_guest_exit();
 	instrumentation_end();
 }
 #endif /* CONFIG_VIRT_CPU_ACCOUNTING_GEN */