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 02/10] KVM: nVMX: Drop a superfluous WARN on reflecting EXTERNAL_INTERRUPT
Date: Fri, 13 Mar 2020 13:14:39 +0100 [thread overview]
Message-ID: <87h7yspi34.fsf@vitty.brq.redhat.com> (raw)
In-Reply-To: <20200312184521.24579-3-sean.j.christopherson@intel.com>
Sean Christopherson <sean.j.christopherson@intel.com> writes:
> Drop the WARN in nested_vmx_reflect_vmexit() that fires if KVM attempts
> to reflect an external interrupt. nested_vmx_exit_reflected() is now
> called from nested_vmx_reflect_vmexit() and unconditionally returns
> false for EXTERNAL_INTERRUPT, i.e. barring a compiler or major CPU bug,
> the WARN will never fire.
>
> Signed-off-by: Sean Christopherson <sean.j.christopherson@intel.com>
> ---
> arch/x86/kvm/vmx/nested.h | 9 ++++-----
> 1 file changed, 4 insertions(+), 5 deletions(-)
>
> diff --git a/arch/x86/kvm/vmx/nested.h b/arch/x86/kvm/vmx/nested.h
> index 6bc379cf4755..8f5ff3e259c9 100644
> --- a/arch/x86/kvm/vmx/nested.h
> +++ b/arch/x86/kvm/vmx/nested.h
> @@ -84,12 +84,11 @@ static inline bool nested_vmx_reflect_vmexit(struct kvm_vcpu *vcpu,
> return false;
>
> /*
> - * At this point, the exit interruption info in exit_intr_info
> - * is only valid for EXCEPTION_NMI exits. For EXTERNAL_INTERRUPT
> - * we need to query the in-kernel LAPIC.
> + * vmcs.VM_EXIT_INTR_INFO is only valid for EXCEPTION_NMI exits. For
> + * EXTERNAL_INTERRUPT, the value for vmcs12->vm_exit_intr_info would
> + * need to be synthesized by querying the in-kernel LAPIC, but external
> + * interrupts are never reflected to L1 so it's a non-issue.
> */
> - WARN_ON(exit_reason == EXIT_REASON_EXTERNAL_INTERRUPT);
> -
> exit_intr_info = vmcs_read32(VM_EXIT_INTR_INFO);
> if ((exit_intr_info &
> (INTR_INFO_VALID_MASK | INTR_INFO_DELIVER_CODE_MASK)) ==
Reviewed-by: Vitaly Kuznetsov <vkuznets@redhat.com>
--
Vitaly
next prev parent reply other threads:[~2020-03-13 12:14 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 [this message]
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
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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