linux-kernel - Re: [PATCH v5 27/34] KVM: SVM: Add support for booting APs for an SEV-ES guest

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Date:   Mon, 14 Dec 2020 17:05:39 +0100
From:   Paolo Bonzini <pbonzini@...hat.com>
To:     Tom Lendacky <thomas.lendacky@....com>, kvm@...r.kernel.org,
        linux-kernel@...r.kernel.org, x86@...nel.org
Cc:     Jim Mattson <jmattson@...gle.com>, Joerg Roedel <joro@...tes.org>,
        Sean Christopherson <seanjc@...gle.com>,
        Vitaly Kuznetsov <vkuznets@...hat.com>,
        Wanpeng Li <wanpengli@...cent.com>,
        Borislav Petkov <bp@...en8.de>, Ingo Molnar <mingo@...hat.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Brijesh Singh <brijesh.singh@....com>
Subject: Re: [PATCH v5 27/34] KVM: SVM: Add support for booting APs for an
 SEV-ES guest

On 10/12/20 18:10, Tom Lendacky wrote:
> @@ -10144,6 +10144,15 @@ void kvm_vcpu_deliver_sipi_vector(struct kvm_vcpu *vcpu, u8 vector)
>   {
>   	struct kvm_segment cs;
>   
> +	/*
> +	 * Guests with protected state can't have their state altered by KVM,
> +	 * call the vcpu_deliver_sipi_vector() x86 op for processing.
> +	 */
> +	if (vcpu->arch.guest_state_protected) {
> +		kvm_x86_ops.vcpu_deliver_sipi_vector(vcpu, vector);
> +		return;
> +	}
> +

Also, I don't mind that you just call 
kvm_x86_ops.vcpu_deliver_sipi_vector from lapic.c, and make VMX just do

	.vcpu_deliver_sipi_vector = kvm_vcpu_deliver_sipi_vector,

(SVM would do it if !guest_state_protected).  This matches more or less 
how I redid the MSR part.

Paolo