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From:   Jim Mattson <jmattson@google.com>
Date:   Fri, 16 Aug 2019 11:19:46 -0700
Message-ID: <CALMp9eRDhbxkFNqY-+GOMtfg+guafdKcCNq1OJt9UgnyFVvSGw@mail.gmail.com>
Subject: Re: [PATCH RESEND v4 5/9] KVM: VMX: Add init/set/get functions for SPP
To:     Yang Weijiang <weijiang.yang@intel.com>
Cc:     Sean Christopherson <sean.j.christopherson@intel.com>,
        Vitaly Kuznetsov <vkuznets@redhat.com>,
        kvm list <kvm@vger.kernel.org>,
        LKML <linux-kernel@vger.kernel.org>,
        "Michael S. Tsirkin" <mst@redhat.com>,
        =?UTF-8?B?UmFkaW0gS3LEjW3DocWZ?= <rkrcmar@redhat.com>,
        yu.c.zhang@intel.com, alazar@bitdefender.com,
        Paolo Bonzini <pbonzini@redhat.com>
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On Fri, Aug 16, 2019 at 6:29 AM Yang Weijiang <weijiang.yang@intel.com> wrote:

> Thanks Jim and Sean! Could we add a new flag in kvm to identify if nested VM is on
> or off? That would make things easier. When VMLAUNCH is trapped,
> set the flag, if VMXOFF is trapped, clear the flag.

KVM_GET_NESTED_STATE has the requested information. If
data.vmx.vmxon_pa is anything other than -1, then the vCPU is in VMX
operation. If (flags & KVM_STATE_NESTED_GUEST_MODE), then L2 is
active.