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

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Date:   Tue, 5 Apr 2022 17:48:54 +0200
From:   Paolo Bonzini <pbonzini@...hat.com>
To:     isaku.yamahata@...el.com, kvm@...r.kernel.org,
        linux-kernel@...r.kernel.org
Cc:     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 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?  KVM_APIC_INIT is not valid for SEV-ES either, if I 
remember correctly.

Paolo