linux-kernel - Re: [PATCH v2 17/25] KVM: TDX: create/destroy VM structure

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Message-ID: <Zyhi1xzJpaA6yEnB@tlindgre-MOBL1>
Date: Mon, 4 Nov 2024 07:59:51 +0200
From: Tony Lindgren <tony.lindgren@...ux.intel.com>
To: Chao Gao <chao.gao@...el.com>
Cc: Rick Edgecombe <rick.p.edgecombe@...el.com>, pbonzini@...hat.com,
	seanjc@...gle.com, yan.y.zhao@...el.com, isaku.yamahata@...il.com,
	kai.huang@...el.com, kvm@...r.kernel.org,
	linux-kernel@...r.kernel.org, xiaoyao.li@...el.com,
	reinette.chatre@...el.com,
	Isaku Yamahata <isaku.yamahata@...el.com>,
	Sean Christopherson <sean.j.christopherson@...el.com>
Subject: Re: [PATCH v2 17/25] KVM: TDX: create/destroy VM structure

On Mon, Nov 04, 2024 at 10:03:59AM +0800, Chao Gao wrote:
> >+static int __tdx_td_init(struct kvm *kvm)
> >+{
> >+	struct kvm_tdx *kvm_tdx = to_kvm_tdx(kvm);
> >+	cpumask_var_t packages;
> >+	unsigned long *tdcs_pa = NULL;
> >+	unsigned long tdr_pa = 0;
> >+	unsigned long va;
> >+	int ret, i;
> >+	u64 err;
> >+
> >+	ret = tdx_guest_keyid_alloc();
> >+	if (ret < 0)
> >+		return ret;
> >+	kvm_tdx->hkid = ret;
> >+
> >+	va = __get_free_page(GFP_KERNEL_ACCOUNT);
> >+	if (!va)
> >+		goto free_hkid;
> 
> @ret should be set to -ENOMEM before goto. otherwise, the error code would be
> the guest HKID.

Good catch.

> >+	if (!zalloc_cpumask_var(&packages, GFP_KERNEL)) {
> >+		ret = -ENOMEM;
> 
> maybe just hoist this line before allocating tdr.

Yeah it should be initialized earlier.

Tony