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

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Message-ID: <482bd937c52cf79c49f1c666cbc8d28c11af7c4a.camel@intel.com>
Date: Thu, 28 Mar 2024 18:26:50 +0000
From: "Edgecombe, Rick P" <rick.p.edgecombe@...el.com>
To: "Li, Xiaoyao" <xiaoyao.li@...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 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?