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From: Vitaly Kuznetsov <vkuznets@redhat.com>
To: Sean Christopherson <sean.j.christopherson@intel.com>
Cc: Paolo Bonzini <pbonzini@redhat.com>,
	Wanpeng Li <wanpengli@tencent.com>,
	Jim Mattson <jmattson@google.com>, Joerg Roedel <joro@8bytes.org>,
	kvm@vger.kernel.org, linux-kernel@vger.kernel.org,
	Xiaoyao Li <xiaoyao.li@intel.com>
Subject: Re: [PATCH 07/10] KVM: nVMX: Cast exit_reason to u16 to check for nested EXTERNAL_INTERRUPT
Date: Fri, 13 Mar 2020 14:56:55 +0100	[thread overview]
Message-ID: <87mu8knys8.fsf@vitty.brq.redhat.com> (raw)
In-Reply-To: <20200312184521.24579-8-sean.j.christopherson@intel.com>

Sean Christopherson <sean.j.christopherson@intel.com> writes:

> Explicitly check only the basic exit reason when emulating an external
> interrupt VM-Exit in nested_vmx_vmexit().  Checking the full exit reason
> doesn't currently cause problems, but only because the only exit reason
> modifier support by KVM is FAILED_VMENTRY, which is mutually exclusive
> with EXTERNAL_INTERRUPT.  Future modifiers, e.g. ENCLAVE_MODE, will
> coexist with EXTERNAL_INTERRUPT.
>
> Signed-off-by: Sean Christopherson <sean.j.christopherson@intel.com>
> ---
>  arch/x86/kvm/vmx/nested.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/arch/x86/kvm/vmx/nested.c b/arch/x86/kvm/vmx/nested.c
> index 8fbbe2152ab7..86b12a2918c5 100644
> --- a/arch/x86/kvm/vmx/nested.c
> +++ b/arch/x86/kvm/vmx/nested.c
> @@ -4337,7 +4337,7 @@ void nested_vmx_vmexit(struct kvm_vcpu *vcpu, u32 exit_reason,
>  	vcpu->arch.mp_state = KVM_MP_STATE_RUNNABLE;
>  
>  	if (likely(!vmx->fail)) {
> -		if (exit_reason == EXIT_REASON_EXTERNAL_INTERRUPT &&
> +		if ((u16)exit_reason == EXIT_REASON_EXTERNAL_INTERRUPT &&
>  		    nested_exit_intr_ack_set(vcpu)) {
>  			int irq = kvm_cpu_get_interrupt(vcpu);
>  			WARN_ON(irq < 0);

Reviewed-by: Vitaly Kuznetsov <vkuznets@redhat.com>

-- 
Vitaly


  reply	other threads:[~2020-03-13 13:57 UTC|newest]

Thread overview: 33+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-03-12 18:45 [PATCH 00/10] KVM: VMX: Unionize vcpu_vmx.exit_reason Sean Christopherson
2020-03-12 18:45 ` [PATCH 01/10] KVM: nVMX: Move reflection check into nested_vmx_reflect_vmexit() Sean Christopherson
2020-03-13 12:12   ` Vitaly Kuznetsov
2020-03-17  5:33     ` Sean Christopherson
2020-03-17 16:16       ` Sean Christopherson
2020-03-17 17:00         ` Vitaly Kuznetsov
2020-03-17 17:38           ` Paolo Bonzini
2020-03-17 18:01             ` Sean Christopherson
2020-03-12 18:45 ` [PATCH 02/10] KVM: nVMX: Drop a superfluous WARN on reflecting EXTERNAL_INTERRUPT Sean Christopherson
2020-03-13 12:14   ` Vitaly Kuznetsov
2020-03-12 18:45 ` [PATCH 03/10] KVM: nVMX: Pull exit_reason from vcpu_vmx in nested_vmx_exit_reflected() Sean Christopherson
2020-03-13 12:38   ` Vitaly Kuznetsov
2020-03-12 18:45 ` [PATCH 04/10] KVM: VMX: Convert local exit_reason to u16 " Sean Christopherson
2020-03-13 12:47   ` Vitaly Kuznetsov
2020-03-12 18:45 ` [PATCH 05/10] KVM: VMX: Convert local exit_reason to u16 in vmx_handle_exit() Sean Christopherson
2020-03-13 13:48   ` Vitaly Kuznetsov
2020-03-12 18:45 ` [PATCH 06/10] KVM: nVMX: Convert local exit_reason to u16 in ...enter_non_root_mode() Sean Christopherson
2020-03-13 13:55   ` Vitaly Kuznetsov
2020-03-13 14:00     ` David Laight
2020-03-17  5:29     ` Sean Christopherson
2020-03-17 17:40       ` Paolo Bonzini
2020-03-12 18:45 ` [PATCH 07/10] KVM: nVMX: Cast exit_reason to u16 to check for nested EXTERNAL_INTERRUPT Sean Christopherson
2020-03-13 13:56   ` Vitaly Kuznetsov [this message]
2020-03-12 18:45 ` [PATCH 08/10] KVM: nVMX: Rename exit_reason to vm_exit_reason for nested VM-Exit Sean Christopherson
2020-03-13 14:01   ` Vitaly Kuznetsov
2020-03-13 16:17     ` Sean Christopherson
2020-03-12 18:45 ` [PATCH 09/10] KVM: VMX: Cache vmx->exit_reason in local u16 in vmx_handle_exit_irqoff() Sean Christopherson
2020-03-13 14:09   ` Vitaly Kuznetsov
2020-03-17 17:50     ` Paolo Bonzini
2020-03-12 18:45 ` [PATCH 10/10] KVM: VMX: Convert vcpu_vmx.exit_reason to a union Sean Christopherson
2020-03-13 14:18   ` Vitaly Kuznetsov
2020-03-17  5:28     ` Sean Christopherson
2020-03-17 17:51       ` Paolo Bonzini

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