linux-kernel - Re: [PATCH v2 1/6] KVM: add kvm_arch_sched

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Date:	Thu, 21 Aug 2014 10:29:42 +0200
From:	Paolo Bonzini <pbonzini@...hat.com>
To:	Radim Krčmář <rkrcmar@...hat.com>,
	kvm@...r.kernel.org
CC:	linux-kernel@...r.kernel.org, Gleb Natapov <gleb@...nel.org>,
	Raghavendra KT <raghavendra.kt@...ux.vnet.ibm.com>,
	Vinod Chegu <chegu_vinod@...com>,
	Hui-Zhi <hui-zhi.zhao@...com>,
	Christian Borntraeger <borntraeger@...ibm.com>
Subject: Re: [PATCH v2 1/6] KVM: add kvm_arch_sched_in

Il 20/08/2014 22:53, Radim Krčmář ha scritto:
> Introduce preempt notifiers for architecture specific code.
> Advantage over creating a new notifier in every arch is slightly simpler
> code and guaranteed call order with respect to kvm_sched_in.
> 
> Signed-off-by: Radim Krčmář <rkrcmar@...hat.com>
> ---
>  arch/arm/kvm/arm.c         | 4 ++++
>  arch/mips/kvm/mips.c       | 4 ++++
>  arch/powerpc/kvm/powerpc.c | 4 ++++
>  arch/s390/kvm/kvm-s390.c   | 4 ++++
>  arch/x86/kvm/x86.c         | 4 ++++

What about adding them as static inlines in
arch/*/include/asm/kvm_host.h (except for arch/x86 of course)?

Paolo

>  include/linux/kvm_host.h   | 2 ++
>  virt/kvm/kvm_main.c        | 2 ++
>  7 files changed, 24 insertions(+)
> 
> diff --git a/arch/arm/kvm/arm.c b/arch/arm/kvm/arm.c
> index a99e0cd..9f788eb 100644
> --- a/arch/arm/kvm/arm.c
> +++ b/arch/arm/kvm/arm.c
> @@ -288,6 +288,10 @@ void kvm_arch_vcpu_uninit(struct kvm_vcpu *vcpu)
>  {
>  }
>  
> +void kvm_arch_sched_in(struct kvm_vcpu *vcpu, int cpu)
> +{
> +}
> +
>  void kvm_arch_vcpu_load(struct kvm_vcpu *vcpu, int cpu)
>  {
>  	vcpu->cpu = cpu;
> diff --git a/arch/mips/kvm/mips.c b/arch/mips/kvm/mips.c
> index cd71141..2362df2 100644
> --- a/arch/mips/kvm/mips.c
> +++ b/arch/mips/kvm/mips.c
> @@ -1002,6 +1002,10 @@ void kvm_arch_vcpu_uninit(struct kvm_vcpu *vcpu)
>  {
>  }
>  
> +void kvm_arch_sched_in(struct kvm_vcpu *vcpu, int cpu)
> +{
> +}
> +
>  int kvm_arch_vcpu_ioctl_translate(struct kvm_vcpu *vcpu,
>  				  struct kvm_translation *tr)
>  {
> diff --git a/arch/powerpc/kvm/powerpc.c b/arch/powerpc/kvm/powerpc.c
> index 4c79284..cbc432f 100644
> --- a/arch/powerpc/kvm/powerpc.c
> +++ b/arch/powerpc/kvm/powerpc.c
> @@ -720,6 +720,10 @@ void kvm_arch_vcpu_uninit(struct kvm_vcpu *vcpu)
>  	kvmppc_subarch_vcpu_uninit(vcpu);
>  }
>  
> +void kvm_arch_sched_in(struct kvm_vcpu *vcpu, int cpu)
> +{
> +}
> +
>  void kvm_arch_vcpu_load(struct kvm_vcpu *vcpu, int cpu)
>  {
>  #ifdef CONFIG_BOOKE
> diff --git a/arch/s390/kvm/kvm-s390.c b/arch/s390/kvm/kvm-s390.c
> index ce81eb2..a3c324e 100644
> --- a/arch/s390/kvm/kvm-s390.c
> +++ b/arch/s390/kvm/kvm-s390.c
> @@ -555,6 +555,10 @@ void kvm_arch_vcpu_uninit(struct kvm_vcpu *vcpu)
>  	/* Nothing todo */
>  }
>  
> +void kvm_arch_sched_in(struct kvm_vcpu *vcpu, int cpu)
> +{
> +}
> +
>  void kvm_arch_vcpu_load(struct kvm_vcpu *vcpu, int cpu)
>  {
>  	save_fp_ctl(&vcpu->arch.host_fpregs.fpc);
> diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
> index 8f1e22d..d7c214f 100644
> --- a/arch/x86/kvm/x86.c
> +++ b/arch/x86/kvm/x86.c
> @@ -7146,6 +7146,10 @@ void kvm_arch_vcpu_uninit(struct kvm_vcpu *vcpu)
>  		static_key_slow_dec(&kvm_no_apic_vcpu);
>  }
>  
> +void kvm_arch_sched_in(struct kvm_vcpu *vcpu, int cpu)
> +{
> +}
> +
>  int kvm_arch_init_vm(struct kvm *kvm, unsigned long type)
>  {
>  	if (type)
> diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h
> index a4c33b3..ebd7236 100644
> --- a/include/linux/kvm_host.h
> +++ b/include/linux/kvm_host.h
> @@ -624,6 +624,8 @@ void kvm_arch_exit(void);
>  int kvm_arch_vcpu_init(struct kvm_vcpu *vcpu);
>  void kvm_arch_vcpu_uninit(struct kvm_vcpu *vcpu);
>  
> +void kvm_arch_sched_in(struct kvm_vcpu *vcpu, int cpu);
> +
>  void kvm_arch_vcpu_free(struct kvm_vcpu *vcpu);
>  void kvm_arch_vcpu_load(struct kvm_vcpu *vcpu, int cpu);
>  void kvm_arch_vcpu_put(struct kvm_vcpu *vcpu);
> diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
> index 33712fb..d3c3ed0 100644
> --- a/virt/kvm/kvm_main.c
> +++ b/virt/kvm/kvm_main.c
> @@ -3123,6 +3123,8 @@ static void kvm_sched_in(struct preempt_notifier *pn, int cpu)
>  	if (vcpu->preempted)
>  		vcpu->preempted = false;
>  
> +	kvm_arch_sched_in(vcpu, cpu);
> +
>  	kvm_arch_vcpu_load(vcpu, cpu);
>  }
>  
> 

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