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

[Christian Borntraeger]

On 16.04.21 00:20, Sean Christopherson wrote:
> From: Wanpeng Li <wanpengli@xxxxxxxxxxx>
>
> 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@xxxxxxxxxxxxx>
> Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
> Cc: Sean Christopherson <seanjc@xxxxxxxxxx>
> Cc: Michael Tokarev <mjt@xxxxxxxxxx>
> Cc: Christian Borntraeger <borntraeger@xxxxxxxxxx>
> Signed-off-by: Wanpeng Li <wanpengli@xxxxxxxxxxx>
> Co-developed-by: Sean Christopherson <seanjc@xxxxxxxxxx>
> Signed-off-by: Sean Christopherson <seanjc@xxxxxxxxxx>

Reviewed-by: Christian Borntraeger <borntraeger@xxxxxxxxxx>
> ---
>   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();