linux-kernel - Re: [PATCH v2 5/6] KVM: x86: Keep a per-VM MTRR state

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Date:   Wed, 10 May 2023 10:23:04 -0700
From:   David Matlack <dmatlack@...gle.com>
To:     Yan Zhao <yan.y.zhao@...el.com>
Cc:     kvm@...r.kernel.org, linux-kernel@...r.kernel.org,
        pbonzini@...hat.com, seanjc@...gle.com
Subject: Re: [PATCH v2 5/6] KVM: x86: Keep a per-VM MTRR state

On Tue, May 09, 2023 at 09:53:00PM +0800, Yan Zhao wrote:
> +void kvm_mtrr_init(struct kvm_vcpu *vcpu)
> +{
> +	struct kvm *kvm = vcpu->kvm;
> +
> +	if (vcpu->vcpu_id)
> +		return;

vcpu_id is provided by userspace so I don't think there's any guarantee
that a vCPU with vcpu_id == 0 exists.