Re: [PATCH v2 1/3] context_tracking: Split guest_enter/exit_irqoff

From: Christian Borntraeger <borntraeger@de.ibm.com>
To: Wanpeng Li <kernellwp@gmail.com>,
	linux-kernel@vger.kernel.org, kvm@vger.kernel.org
Cc: Paolo Bonzini <pbonzini@redhat.com>,
	Sean Christopherson <seanjc@google.com>,
	Vitaly Kuznetsov <vkuznets@redhat.com>,
	Wanpeng Li <wanpengli@tencent.com>,
	Jim Mattson <jmattson@google.com>, Joerg Roedel <joro@8bytes.org>,
	Thomas Gleixner <tglx@linutronix.de>,
	Michael Tokarev <mjt@tls.msk.ru>
Subject: Re: [PATCH v2 1/3] context_tracking: Split guest_enter/exit_irqoff
Date: Tue, 13 Apr 2021 09:35:24 +0200	[thread overview]
Message-ID: <81112cec-72fa-dd8c-21c8-b24f51021f43@de.ibm.com> (raw)
In-Reply-To: <1618298169-3831-2-git-send-email-wanpengli@tencent.com>

On 13.04.21 09:16, Wanpeng Li wrote:
[...]

> @@ -145,6 +155,13 @@ static __always_inline void guest_exit_irqoff(void)
>   }
> 
>   #else
> +static __always_inline void context_guest_enter_irqoff(void)
> +{
> +	instrumentation_begin();
> +	rcu_virt_note_context_switch(smp_processor_id());
> +	instrumentation_end();
> +}
> +
>   static __always_inline void guest_enter_irqoff(void)
>   {
>   	/*
> @@ -155,10 +172,13 @@ static __always_inline void guest_enter_irqoff(void)
>   	instrumentation_begin();
>   	vtime_account_kernel(current);
>   	current->flags |= PF_VCPU;
> -	rcu_virt_note_context_switch(smp_processor_id());
>   	instrumentation_end();
> +
> +	context_guest_enter_irqoff();

So we now do instrumentation_begin 2 times?