linux-kernel - Re: [RFC PATCH v5 101/104] KVM: TDX: Silently ignore INIT/SIPI

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Date:   Thu, 7 Apr 2022 20:40:58 -0700
From:   Isaku Yamahata <isaku.yamahata@...il.com>
To:     Paolo Bonzini <pbonzini@...hat.com>
Cc:     Xiaoyao Li <xiaoyao.li@...el.com>, isaku.yamahata@...el.com,
        kvm@...r.kernel.org, linux-kernel@...r.kernel.org,
        isaku.yamahata@...il.com, Jim Mattson <jmattson@...gle.com>,
        erdemaktas@...gle.com, Connor Kuehl <ckuehl@...hat.com>,
        Sean Christopherson <seanjc@...gle.com>,
        Tom Lendacky <thomas.lendacky@....com>
Subject: Re: [RFC PATCH v5 101/104] KVM: TDX: Silently ignore INIT/SIPI

On Thu, Apr 07, 2022 at 02:12:28PM +0200,
Paolo Bonzini <pbonzini@...hat.com> wrote:

> On 4/7/22 13:09, Xiaoyao Li wrote:
> > On 4/5/2022 11:48 PM, Paolo Bonzini wrote:
> > > On 3/4/22 20:49, isaku.yamahata@...el.com wrote:
> > > > +        if (kvm_init_sipi_unsupported(vcpu->kvm))
> > > > +            /*
> > > > +             * TDX doesn't support INIT.  Ignore INIT event.  In the
> > > > +             * case of SIPI, the callback of
> > > > +             * vcpu_deliver_sipi_vector ignores it.
> > > > +             */
> > > >               vcpu->arch.mp_state = KVM_MP_STATE_RUNNABLE;
> > > > -        else
> > > > -            vcpu->arch.mp_state = KVM_MP_STATE_INIT_RECEIVED;
> > > > +        else {
> > > > +            kvm_vcpu_reset(vcpu, true);
> > > > +            if (kvm_vcpu_is_bsp(apic->vcpu))
> > > > +                vcpu->arch.mp_state = KVM_MP_STATE_RUNNABLE;
> > > > +            else
> > > > +                vcpu->arch.mp_state = KVM_MP_STATE_INIT_RECEIVED;
> > > > +        }
> > > 
> > > Should you check vcpu->arch.guest_state_protected instead of
> > > special-casing TDX?
> > 
> > We cannot use vcpu->arch.guest_state_protected because TDX supports
> > debug TD, of which the states are not protected.
> > 
> > At least we need another flag, I think.
> 
> Let's add .deliver_init to the kvm_x86_ops then.

Will do.
-- 
Isaku Yamahata <isaku.yamahata@...il.com>