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

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Date:   Mon, 19 Aug 2019 10:08:29 +0800
From:   Yang Weijiang <weijiang.yang@...el.com>
To:     Jim Mattson <jmattson@...gle.com>
Cc:     Yang Weijiang <weijiang.yang@...el.com>,
        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 11:19:46AM -0700, Jim Mattson wrote:
> 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.
Thanks Jim, I'll reference the code and make necessary change in next
SPP patch release.