linux-kernel - Re: [RFC PATCH v5 008/104] KVM: TDX: Add a function to initialize TDX module

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Message-ID: <d63042a2-91d8-5555-1bac-4d908e03da2b@intel.com>
Date:   Fri, 1 Apr 2022 14:56:40 +0800
From:   Xiaoyao Li <xiaoyao.li@...el.com>
To:     Isaku Yamahata <isaku.yamahata@...il.com>,
        Kai Huang <kai.huang@...el.com>
Cc:     isaku.yamahata@...el.com, kvm@...r.kernel.org,
        linux-kernel@...r.kernel.org, Paolo Bonzini <pbonzini@...hat.com>,
        Jim Mattson <jmattson@...gle.com>, erdemaktas@...gle.com,
        Connor Kuehl <ckuehl@...hat.com>,
        Sean Christopherson <seanjc@...gle.com>
Subject: Re: [RFC PATCH v5 008/104] KVM: TDX: Add a function to initialize TDX
 module

On 4/1/2022 3:41 AM, Isaku Yamahata wrote:
> On Thu, Mar 31, 2022 at 04:31:10PM +1300,
> Kai Huang <kai.huang@...el.com> wrote:
> 
>> On Fri, 2022-03-04 at 11:48 -0800, isaku.yamahata@...el.com wrote:
>>> From: Isaku Yamahata <isaku.yamahata@...el.com>
> 
>>> Add a wrapper function to initialize the TDX module and get system-wide
>>> parameters via those APIs.  Because TDX requires VMX enabled, It will be
>>> called on-demand when the first guest TD is created via x86 KVM init_vm
>>> callback.
>>
>> Why not just merge this patch with the change where you implement the init_vm
>> callback?  Then you can just declare this patch as "detect and initialize TDX
>> module when first VM is created", or something like that..
> 
> Ok. Anyway in the next respoin, tdx module initialization will be done when
> loading kvm_intel.ko.  So the whole part will be changed and will be a part
> of module loading.

Will we change the GET_TDX_CAPABILITIES ioctl back to KVM scope?