linux-kernel - Re: [PATCH 1/6] KVM: vmx: clear pending interrupts on KVM_SET

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Message-ID: <20170207174236.GA31091@potion>
Date:   Tue, 7 Feb 2017 18:42:36 +0100
From:   Radim Krčmář <rkrcmar@...hat.com>
To:     Paolo Bonzini <pbonzini@...hat.com>
Cc:     linux-kernel@...r.kernel.org, kvm@...r.kernel.org
Subject: Re: [PATCH 1/6] KVM: vmx: clear pending interrupts on KVM_SET_LAPIC

2016-12-19 17:17+0100, Paolo Bonzini:
> Pending interrupts might be in the PI descriptor when the
> LAPIC is restored from an external state; we do not want
> them to be injected.
> 
> Signed-off-by: Paolo Bonzini <pbonzini@...hat.com>
> ---

Reviewed-by: Radim Krčmář <rkrcmar@...hat.com>

>  arch/x86/kvm/lapic.c | 3 +--
>  arch/x86/kvm/vmx.c   | 9 +++++++++
>  2 files changed, 10 insertions(+), 2 deletions(-)
> 
> diff --git a/arch/x86/kvm/lapic.c b/arch/x86/kvm/lapic.c
> index 4dc02482faf7..5fa546e27b7e 100644
> --- a/arch/x86/kvm/lapic.c
> +++ b/arch/x86/kvm/lapic.c
> @@ -2185,8 +2185,7 @@ int kvm_apic_set_state(struct kvm_vcpu *vcpu, struct kvm_lapic_state *s)
>  				1 : count_vectors(apic->regs + APIC_ISR);
>  	apic->highest_isr_cache = -1;
>  	if (vcpu->arch.apicv_active) {
> -		if (kvm_x86_ops->apicv_post_state_restore)
> -			kvm_x86_ops->apicv_post_state_restore(vcpu);
> +		kvm_x86_ops->apicv_post_state_restore(vcpu);
>  		kvm_x86_ops->hwapic_irr_update(vcpu,
>  				apic_find_highest_irr(apic));
>  		kvm_x86_ops->hwapic_isr_update(vcpu,
> diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c
> index 1ba7aaf6ae7f..661956caf162 100644
> --- a/arch/x86/kvm/vmx.c
> +++ b/arch/x86/kvm/vmx.c
> @@ -8761,6 +8761,14 @@ static void vmx_load_eoi_exitmap(struct kvm_vcpu *vcpu, u64 *eoi_exit_bitmap)
>  	vmcs_write64(EOI_EXIT_BITMAP3, eoi_exit_bitmap[3]);
>  }
>  
> +static void vmx_apicv_post_state_restore(struct kvm_vcpu *vcpu)
> +{
> +	struct vcpu_vmx *vmx = to_vmx(vcpu);
> +
> +	pi_clear_on(&vmx->pi_desc);
> +	memset(vmx->pi_desc.pir, 0, sizeof(vmx->pi_desc.pir));
> +}
> +
>  static void vmx_complete_atomic_exit(struct vcpu_vmx *vmx)
>  {
>  	u32 exit_intr_info;
> @@ -11590,6 +11598,7 @@ static void vmx_setup_mce(struct kvm_vcpu *vcpu)
>  	.get_enable_apicv = vmx_get_enable_apicv,
>  	.refresh_apicv_exec_ctrl = vmx_refresh_apicv_exec_ctrl,
>  	.load_eoi_exitmap = vmx_load_eoi_exitmap,
> +	.apicv_post_state_restore = vmx_apicv_post_state_restore,
>  	.hwapic_irr_update = vmx_hwapic_irr_update,
>  	.hwapic_isr_update = vmx_hwapic_isr_update,
>  	.sync_pir_to_irr = vmx_sync_pir_to_irr,
> -- 
> 1.8.3.1
> 
> 
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