linux-kernel - Re: [PATCH 11/13] KVM: VMX: Use vmx_interrupt_blocked() directly from vmx_handle

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Message-ID: <CALMp9eQybxs+Zq66uAfVz3bc=571V7H8YVEhm7AuftpcZ5NLRw@mail.gmail.com>
Date:   Tue, 28 Apr 2020 15:07:38 -0700
From:   Jim Mattson <jmattson@...gle.com>
To:     Sean Christopherson <sean.j.christopherson@...el.com>
Cc:     Paolo Bonzini <pbonzini@...hat.com>,
        Vitaly Kuznetsov <vkuznets@...hat.com>,
        Wanpeng Li <wanpengli@...cent.com>,
        Joerg Roedel <joro@...tes.org>, kvm list <kvm@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Oliver Upton <oupton@...gle.com>,
        Peter Shier <pshier@...gle.com>
Subject: Re: [PATCH 11/13] KVM: VMX: Use vmx_interrupt_blocked() directly from vmx_handle_exit()

On Wed, Apr 22, 2020 at 7:26 PM Sean Christopherson
<sean.j.christopherson@...el.com> wrote:
>
> Use vmx_interrupt_blocked() instead of bouncing through
> vmx_interrupt_allowed() when handling edge cases in vmx_handle_exit().
> The nested_run_pending check in vmx_interrupt_allowed() should never
> evaluate true in the VM-Exit path.
>
> Hoist the WARN in handle_invalid_guest_state() up to vmx_handle_exit()
> to enforce the above assumption for the !enable_vnmi case, and to detect
> any other potential bugs with nested VM-Enter.
>
> Signed-off-by: Sean Christopherson <sean.j.christopherson@...el.com>
Reviewed-by: Jim Mattson <jmattson@...gle.com>