linux-kernel - Re: [PATCH v19 039/130] KVM: TDX: initialize VM with TDX specific parameters

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Date: Mon, 1 Apr 2024 15:23:04 +0800
From: Xiaoyao Li <xiaoyao.li@...el.com>
To: "Edgecombe, Rick P" <rick.p.edgecombe@...el.com>,
 "Gao, Chao" <chao.gao@...el.com>, "Yamahata, Isaku"
 <isaku.yamahata@...el.com>
Cc: "Zhang, Tina" <tina.zhang@...el.com>,
 "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
 "seanjc@...gle.com" <seanjc@...gle.com>, "Huang, Kai" <kai.huang@...el.com>,
 "Chen, Bo2" <chen.bo@...el.com>, "sagis@...gle.com" <sagis@...gle.com>,
 "isaku.yamahata@...ux.intel.com" <isaku.yamahata@...ux.intel.com>,
 "Aktas, Erdem" <erdemaktas@...gle.com>,
 "isaku.yamahata@...il.com" <isaku.yamahata@...il.com>,
 "kvm@...r.kernel.org" <kvm@...r.kernel.org>, "Yuan, Hang"
 <hang.yuan@...el.com>, "pbonzini@...hat.com" <pbonzini@...hat.com>
Subject: Re: [PATCH v19 039/130] KVM: TDX: initialize VM with TDX specific
 parameters

On 3/29/2024 2:26 AM, Edgecombe, Rick P wrote:
> On Thu, 2024-03-28 at 09:36 +0800, Xiaoyao Li wrote:
>>>>> Any reason to mask off non-configurable bits rather than return an error? this
>>>>> is misleading to userspace because guest sees the values emulated by TDX module
>>>>> instead of the values passed from userspace (i.e., the request from userspace
>>>>> isn't done but there is no indication of that to userspace).
>>>>
>>>> Ok, I'll eliminate them.  If user space passes wrong cpuids, TDX module will
>>>> return error. I'll leave the error check to the TDX module.
>>>
>>> I was just looking at this. Agreed. It breaks the selftests though.
>>
>> If all you prefer to go this direction, then please update the error
>> handling of this specific SEAMCALL.
> 
> What do you mean by SEAMCALL, TDH_MNG_INIT? Can you be more specific?

Sorry. I missed the fact that current patch already has the specific 
handling for TDX_OPERAND_INVALID for TDH.MNG.INIT.

I need to update QEMU to match the new behavior.