linux-kernel - Re: [PATCH v10 016/108] KVM: TDX: create/destroy VM structure

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Message-ID: <20221117174826.GE2350331@ls.amr.corp.intel.com>
Date:   Thu, 17 Nov 2022 09:48:26 -0800
From:   Isaku Yamahata <isaku.yamahata@...il.com>
To:     Sagi Shahar <sagis@...gle.com>
Cc:     isaku.yamahata@...el.com, kvm@...r.kernel.org,
        linux-kernel@...r.kernel.org, isaku.yamahata@...il.com,
        Paolo Bonzini <pbonzini@...hat.com>, erdemaktas@...gle.com,
        Sean Christopherson <seanjc@...gle.com>,
        David Matlack <dmatlack@...gle.com>,
        Sean Christopherson <sean.j.christopherson@...el.com>,
        Kai Huang <kai.huang@...el.com>
Subject: Re: [PATCH v10 016/108] KVM: TDX: create/destroy VM structure

On Mon, Nov 14, 2022 at 04:06:10PM -0800,
Sagi Shahar <sagis@...gle.com> wrote:

> > +int tdx_vm_init(struct kvm *kvm)
> > +{
> > +       struct kvm_tdx *kvm_tdx = to_kvm_tdx(kvm);
> > +       cpumask_var_t packages;
> > +       int ret, i;
> > +       u64 err;
> > +
> > +       ret = tdx_keyid_alloc();
> 
> Can we skip the hkid allocation at such an early stage?
> This makes intra-host migration more complicated as the hkid of the
> destination VM is already allocated before we have a chance to migrate
> the state from the source VM.
> 
> I remember you had an internal version that already did that in
> https://github.com/intel/tdx/blob/552dd80c48f67ca01bcdd10667e0c11efd375177/arch/x86/kvm/vmx/tdx.c#L508

With the patch of "KVM: TDX: initialize VM with TDX specific parameters",
the allocation code is split out into its own code with KVM_TDX_INIT_VM.
I think that's what you want.
-- 
Isaku Yamahata <isaku.yamahata@...il.com>