linux-kernel - Re: [PATCH v3 1/9] context_tracking: Move guest exit context tracking to separate helpers

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Date:   Tue, 20 Apr 2021 20:48:05 +0200
From:   Christian Borntraeger <borntraeger@...ibm.com>
To:     Sean Christopherson <seanjc@...gle.com>,
        Paolo Bonzini <pbonzini@...hat.com>
Cc:     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>,
        Michael Tokarev <mjt@....msk.ru>
Subject: Re: [PATCH v3 1/9] context_tracking: Move guest exit context tracking
 to separate helpers



On 16.04.21 00:20, Sean Christopherson wrote:
> From: Wanpeng Li <wanpengli@...cent.com>
> 
> 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>
> Cc: Thomas Gleixner <tglx@...utronix.de>
> Cc: Sean Christopherson <seanjc@...gle.com>
> Cc: Michael Tokarev <mjt@....msk.ru>
> Cc: Christian Borntraeger <borntraeger@...ibm.com>
> Signed-off-by: Wanpeng Li <wanpengli@...cent.com>
> Co-developed-by: Sean Christopherson <seanjc@...gle.com>
> Signed-off-by: Sean Christopherson <seanjc@...gle.com>

Reviewed-by: Christian Borntraeger <borntraeger@...ibm.com>
> ---
>   include/linux/context_tracking.h | 9 ++++++++-
>   1 file changed, 8 insertions(+), 1 deletion(-)
> 
> diff --git a/include/linux/context_tracking.h b/include/linux/context_tracking.h
> index bceb06498521..200d30cb3a82 100644
> --- a/include/linux/context_tracking.h
> +++ b/include/linux/context_tracking.h
> @@ -131,10 +131,15 @@ static __always_inline void guest_enter_irqoff(void)
>   	}
>   }
>   
> -static __always_inline void guest_exit_irqoff(void)
> +static __always_inline void context_tracking_guest_exit_irqoff(void)
>   {
>   	if (context_tracking_enabled())
>   		__context_tracking_exit(CONTEXT_GUEST);
> +}
> +
> +static __always_inline void guest_exit_irqoff(void)
> +{
> +	context_tracking_guest_exit_irqoff();
>   
>   	instrumentation_begin();
>   	if (vtime_accounting_enabled_this_cpu())
> @@ -159,6 +164,8 @@ static __always_inline void guest_enter_irqoff(void)
>   	instrumentation_end();
>   }
>   
> +static __always_inline void context_tracking_guest_exit_irqoff(void) { }
> +
>   static __always_inline void guest_exit_irqoff(void)
>   {
>   	instrumentation_begin();
>