linux-kernel - Re: [PATCH v7 028/102] KVM: TDX: allocate/free TDX vcpu structure

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Date:   Tue, 2 Aug 2022 19:56:05 +0000
From:   Sean Christopherson <seanjc@...gle.com>
To:     isaku.yamahata@...el.com
Cc:     kvm@...r.kernel.org, linux-kernel@...r.kernel.org,
        isaku.yamahata@...il.com, Paolo Bonzini <pbonzini@...hat.com>
Subject: Re: [PATCH v7 028/102] KVM: TDX: allocate/free TDX vcpu structure

On Mon, Jun 27, 2022, isaku.yamahata@...el.com wrote:
> +int tdx_vcpu_create(struct kvm_vcpu *vcpu)
> +{
> +	struct vcpu_tdx *tdx = to_tdx(vcpu);
> +	int ret, i;
> +
> +	/* TDX only supports x2APIC, which requires an in-kernel local APIC. */
> +	if (!vcpu->arch.apic)
> +		return -EINVAL;
> +
> +	fpstate_set_confidential(&vcpu->arch.guest_fpu);
> +
> +	ret = tdx_alloc_td_page(&tdx->tdvpr);
> +	if (ret)
> +		return ret;
> +
> +	tdx->tdvpx = kcalloc(tdx_caps.tdvpx_nr_pages, sizeof(*tdx->tdvpx),
> +			GFP_KERNEL_ACCOUNT);
> +	if (!tdx->tdvpx) {
> +		ret = -ENOMEM;
> +		goto free_tdvpr;
> +	}
> +	for (i = 0; i < tdx_caps.tdvpx_nr_pages; i++) {
> +		ret = tdx_alloc_td_page(&tdx->tdvpx[i]);
> +		if (ret)
> +			goto free_tdvpx;
> +	}

Similar to HKID allocation for intrahost migration, can the TDVPX allocations be
moved to KVM_TDX_INIT_VCPU?