linux-kernel - Re: [PART1 RFC v3 04/12] KVM: split kvm_vcpu_wake_up from kvm_vcpu

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Date:	Fri, 18 Mar 2016 11:11:34 +0100
From:	Paolo Bonzini <pbonzini@...hat.com>
To:	Suravee Suthikulpanit <Suravee.Suthikulpanit@....com>,
	rkrcmar@...hat.com, joro@...tes.org, bp@...en8.de, gleb@...nel.org,
	alex.williamson@...hat.com
Cc:	kvm@...r.kernel.org, linux-kernel@...r.kernel.org, wei@...hat.com,
	sherry.hurwitz@....com
Subject: Re: [PART1 RFC v3 04/12] KVM: split kvm_vcpu_wake_up from
 kvm_vcpu_kick



On 18/03/2016 07:09, Suravee Suthikulpanit wrote:
> From: Radim Krčmář <rkrcmar@...hat.com>
> 
> AVIC has a use for kvm_vcpu_wake_up.
> 
> Signed-off-by: Radim Krčmář <rkrcmar@...hat.com>
> Tested-by: Suravee Suthikulpanit <suravee.suthikulpanit@....com>
> ---
>  include/linux/kvm_host.h |  1 +
>  virt/kvm/kvm_main.c      | 19 +++++++++++++------
>  2 files changed, 14 insertions(+), 6 deletions(-)
> 
> diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h
> index 5276fe0..673749d 100644
> --- a/include/linux/kvm_host.h
> +++ b/include/linux/kvm_host.h
> @@ -651,6 +651,7 @@ void kvm_vcpu_mark_page_dirty(struct kvm_vcpu *vcpu, gfn_t gfn);
>  void kvm_vcpu_block(struct kvm_vcpu *vcpu);
>  void kvm_arch_vcpu_blocking(struct kvm_vcpu *vcpu);
>  void kvm_arch_vcpu_unblocking(struct kvm_vcpu *vcpu);
> +void kvm_vcpu_wake_up(struct kvm_vcpu *vcpu);
>  void kvm_vcpu_kick(struct kvm_vcpu *vcpu);
>  int kvm_vcpu_yield_to(struct kvm_vcpu *target);
>  void kvm_vcpu_on_spin(struct kvm_vcpu *vcpu);
> diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
> index 5460325..e8fe787 100644
> --- a/virt/kvm/kvm_main.c
> +++ b/virt/kvm/kvm_main.c
> @@ -2048,13 +2048,8 @@ out:
>  EXPORT_SYMBOL_GPL(kvm_vcpu_block);
>  
>  #ifndef CONFIG_S390
> -/*
> - * Kick a sleeping VCPU, or a guest VCPU in guest mode, into host kernel mode.
> - */
> -void kvm_vcpu_kick(struct kvm_vcpu *vcpu)
> +void kvm_vcpu_wake_up(struct kvm_vcpu *vcpu)
>  {
> -	int me;
> -	int cpu = vcpu->cpu;
>  	struct swait_queue_head *wqp;
>  
>  	wqp = kvm_arch_vcpu_wq(vcpu);
> @@ -2063,6 +2058,18 @@ void kvm_vcpu_kick(struct kvm_vcpu *vcpu)
>  		++vcpu->stat.halt_wakeup;
>  	}
>  
> +}
> +EXPORT_SYMBOL_GPL(kvm_vcpu_wake_up);
> +
> +/*
> + * Kick a sleeping VCPU, or a guest VCPU in guest mode, into host kernel mode.
> + */
> +void kvm_vcpu_kick(struct kvm_vcpu *vcpu)
> +{
> +	int me;
> +	int cpu = vcpu->cpu;
> +
> +	kvm_vcpu_wake_up(vcpu);
>  	me = get_cpu();
>  	if (cpu != me && (unsigned)cpu < nr_cpu_ids && cpu_online(cpu))
>  		if (kvm_arch_vcpu_should_kick(vcpu))
> 

Reviewed-by: Paolo Bonzini <pbonzini@...hat.com>