linux-kernel - Re: [PATCH RESEND v4 5/9] KVM: VMX: Add init/set/get functions for SPP

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Date:   Fri, 16 Aug 2019 11:19:46 -0700
From:   Jim Mattson <jmattson@...gle.com>
To:     Yang Weijiang <weijiang.yang@...el.com>
Cc:     Sean Christopherson <sean.j.christopherson@...el.com>,
        Vitaly Kuznetsov <vkuznets@...hat.com>,
        kvm list <kvm@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        "Michael S. Tsirkin" <mst@...hat.com>,
        Radim Krčmář <rkrcmar@...hat.com>,
        yu.c.zhang@...el.com, alazar@...defender.com,
        Paolo Bonzini <pbonzini@...hat.com>
Subject: Re: [PATCH RESEND v4 5/9] KVM: VMX: Add init/set/get functions for SPP

On Fri, Aug 16, 2019 at 6:29 AM Yang Weijiang <weijiang.yang@...el.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.