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From: Peter Xu <peterx@redhat.com>
To: Marcelo Tosatti <mtosatti@redhat.com>
Cc: kvm@vger.kernel.org, Paolo Bonzini <pbonzini@redhat.com>,
	Alex Williamson <alex.williamson@redhat.com>,
	Sean Christopherson <seanjc@google.com>
Subject: Re: [patch 1/4] KVM: x86: add start_assignment hook to kvm_x86_ops
Date: Tue, 11 May 2021 12:26:08 -0400	[thread overview]
Message-ID: <YJqwIGqkMfCIMOdS@t490s> (raw)
In-Reply-To: <20210510172817.934490238@redhat.com>

On Mon, May 10, 2021 at 02:26:47PM -0300, Marcelo Tosatti wrote:
> Add a start_assignment hook to kvm_x86_ops, which is called when 
> kvm_arch_start_assignment is done.
> 
> The hook is required to update the wakeup vector of a sleeping vCPU
> when a device is assigned to the guest.
> 
> Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
> 
> Index: kvm/arch/x86/include/asm/kvm_host.h
> ===================================================================
> --- kvm.orig/arch/x86/include/asm/kvm_host.h
> +++ kvm/arch/x86/include/asm/kvm_host.h
> @@ -1322,6 +1322,7 @@ struct kvm_x86_ops {
>  
>  	int (*update_pi_irte)(struct kvm *kvm, unsigned int host_irq,
>  			      uint32_t guest_irq, bool set);
> +	void (*start_assignment)(struct kvm *kvm);
>  	void (*apicv_post_state_restore)(struct kvm_vcpu *vcpu);
>  	bool (*dy_apicv_has_pending_interrupt)(struct kvm_vcpu *vcpu);
>  
> Index: kvm/arch/x86/kvm/svm/svm.c
> ===================================================================
> --- kvm.orig/arch/x86/kvm/svm/svm.c
> +++ kvm/arch/x86/kvm/svm/svm.c
> @@ -4601,6 +4601,7 @@ static struct kvm_x86_ops svm_x86_ops __
>  	.deliver_posted_interrupt = svm_deliver_avic_intr,
>  	.dy_apicv_has_pending_interrupt = svm_dy_apicv_has_pending_interrupt,
>  	.update_pi_irte = svm_update_pi_irte,
> +	.start_assignment = NULL,

Can this be dropped (as default NULL)?

>  	.setup_mce = svm_setup_mce,
>  
>  	.smi_allowed = svm_smi_allowed,
> Index: kvm/arch/x86/kvm/vmx/vmx.c
> ===================================================================
> --- kvm.orig/arch/x86/kvm/vmx/vmx.c
> +++ kvm/arch/x86/kvm/vmx/vmx.c
> @@ -7732,6 +7732,7 @@ static struct kvm_x86_ops vmx_x86_ops __
>  	.nested_ops = &vmx_nested_ops,
>  
>  	.update_pi_irte = pi_update_irte,
> +	.start_assignment = NULL,

Same here?

>  
>  #ifdef CONFIG_X86_64
>  	.set_hv_timer = vmx_set_hv_timer,
> Index: kvm/arch/x86/kvm/x86.c
> ===================================================================
> --- kvm.orig/arch/x86/kvm/x86.c
> +++ kvm/arch/x86/kvm/x86.c
> @@ -11295,7 +11295,11 @@ bool kvm_arch_can_dequeue_async_page_pre
>  
>  void kvm_arch_start_assignment(struct kvm *kvm)
>  {
> -	atomic_inc(&kvm->arch.assigned_device_count);
> +	int ret;
> +
> +	ret = atomic_inc_return(&kvm->arch.assigned_device_count);
> +	if (ret == 1)
> +		static_call_cond(kvm_x86_start_assignment)(kvm);

Maybe "ret" can be dropped too?

void kvm_arch_start_assignment(struct kvm *kvm)
{
	if (atomic_inc_return(&kvm->arch.assigned_device_count) == 1)
		static_call_cond(kvm_x86_start_assignment)(kvm);
}

Otherwise looks good to me.  Thanks,

-- 
Peter Xu


  reply	other threads:[~2021-05-11 16:26 UTC|newest]

Thread overview: 15+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-05-10 17:26 [patch 0/4] VMX: configure posted interrupt descriptor when assigning device (v3) Marcelo Tosatti
2021-05-10 17:26 ` [patch 1/4] KVM: x86: add start_assignment hook to kvm_x86_ops Marcelo Tosatti
2021-05-11 16:26   ` Peter Xu [this message]
2021-05-11 17:29     ` Marcelo Tosatti
2021-05-10 17:26 ` [patch 2/4] KVM: add arch specific vcpu_check_block callback Marcelo Tosatti
2021-05-10 17:26 ` [patch 3/4] KVM: x86: implement kvm_arch_vcpu_check_block callback Marcelo Tosatti
2021-05-10 17:26 ` [patch 4/4] KVM: VMX: update vcpu posted-interrupt descriptor when assigning device Marcelo Tosatti
2021-05-24 15:55   ` Paolo Bonzini
2021-05-24 17:53     ` Marcelo Tosatti
2021-05-25 11:58       ` Paolo Bonzini
  -- strict thread matches above, loose matches on Subject: below --
2021-05-11 23:57 [patch 0/4] VMX: configure posted interrupt descriptor when assigning device (v4) Marcelo Tosatti
2021-05-11 23:57 ` [patch 1/4] KVM: x86: add start_assignment hook to kvm_x86_ops Marcelo Tosatti
2021-05-12 15:30   ` Peter Xu
2021-05-07 13:06 [patch 0/4] VMX: configure posted interrupt descriptor when assigning device Marcelo Tosatti
2021-05-07 13:06 ` [patch 1/4] KVM: x86: add start_assignment hook to kvm_x86_ops Marcelo Tosatti
2021-05-07 19:16   ` Peter Xu
2021-05-10 17:53     ` Marcelo Tosatti

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