linux-kernel - Re: [PATCH v2 15/28] KVM: VMX: Check CPU_BASED_{INTR,NMI}_WINDOW_EXITING in setup_vmcs

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Date:   Thu, 30 Jun 2022 20:58:21 -0700
From:   Jim Mattson <jmattson@...gle.com>
To:     Vitaly Kuznetsov <vkuznets@...hat.com>
Cc:     kvm@...r.kernel.org, Paolo Bonzini <pbonzini@...hat.com>,
        Sean Christopherson <seanjc@...gle.com>,
        Anirudh Rayabharam <anrayabh@...ux.microsoft.com>,
        Wanpeng Li <wanpengli@...cent.com>,
        Maxim Levitsky <mlevitsk@...hat.com>,
        linux-hyperv@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 15/28] KVM: VMX: Check CPU_BASED_{INTR,NMI}_WINDOW_EXITING
 in setup_vmcs_config()

On Wed, Jun 29, 2022 at 8:07 AM Vitaly Kuznetsov <vkuznets@...hat.com> wrote:
>
> CPU_BASED_{INTR,NMI}_WINDOW_EXITING controls are toggled dynamically by
> vmx_enable_{irq,nmi}_window, handle_interrupt_window(), handle_nmi_window()
> but setup_vmcs_config() doesn't check their existence. Add the check and
> filter the controls out in vmx_exec_control().
>
> No (real) functional change intended as all existing CPUs supporting
> VMX are supposed to have these controls.

I'm pretty sure vIrtual NMIs and NMI-window exiting are not available
on Prescott or Yonah.

> Signed-off-by: Vitaly Kuznetsov <vkuznets@...hat.com>
Reviewed-by: Jim Mattson <jmattson@...gle.com>