linux-kernel - Re: [PATCH v10 104/108] KVM: TDX: Silently ignore INIT/SIPI

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Message-ID: <20221216035029.GD527635@ls.amr.corp.intel.com>
Date:   Thu, 15 Dec 2022 19:50:29 -0800
From:   Isaku Yamahata <isaku.yamahata@...il.com>
To:     Binbin Wu <binbin.wu@...ux.intel.com>
Cc:     isaku.yamahata@...el.com, kvm@...r.kernel.org,
        linux-kernel@...r.kernel.org, isaku.yamahata@...il.com,
        Paolo Bonzini <pbonzini@...hat.com>, erdemaktas@...gle.com,
        Sean Christopherson <seanjc@...gle.com>,
        Sagi Shahar <sagis@...gle.com>,
        David Matlack <dmatlack@...gle.com>
Subject: Re: [PATCH v10 104/108] KVM: TDX: Silently ignore INIT/SIPI

On Wed, Nov 23, 2022 at 11:17:44PM +0800,
Binbin Wu <binbin.wu@...ux.intel.com> wrote:

> > diff --git a/arch/x86/kvm/vmx/main.c b/arch/x86/kvm/vmx/main.c
> > index 4acba8d8cb27..d776d5d169d0 100644
> > --- a/arch/x86/kvm/vmx/main.c
> > +++ b/arch/x86/kvm/vmx/main.c
> > @@ -286,6 +286,25 @@ static void vt_deliver_interrupt(struct kvm_lapic *apic, int delivery_mode,
> >   	vmx_deliver_interrupt(apic, delivery_mode, trig_mode, vector);
> >   }
> > +static void vt_vcpu_deliver_sipi_vector(struct kvm_vcpu *vcpu, u8 vector)
> > +{
> > +	if (is_td_vcpu(vcpu))
> > +		return;
> > +
> > +	kvm_vcpu_deliver_sipi_vector(vcpu, vector);
> > +}
> > +
> > +static void vt_vcpu_deliver_init(struct kvm_vcpu *vcpu)
> > +{
> > +	if (is_td_vcpu(vcpu)) {
> > +		/* TDX doesn't support INIT.  Ignore INIT event */
> > +		vcpu->arch.mp_state = KVM_MP_STATE_RUNNABLE;
> > +		return;
> > +	}
> > +
> > +	kvm_vcpu_deliver_init(vcpu);
> > +}
> > +
> 
> Is it better to add WARN_ON_ONCE in the above two functions for TD case?

No because KVM_SET_VCPU_EVENTS ioctl can trigger those callback.

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