linux-kernel - Re: [PATCH v19 007/130] x86/virt/tdx: Export SEAMCALL functions

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Date: Mon, 22 Apr 2024 15:56:13 +0000
From: "Edgecombe, Rick P" <rick.p.edgecombe@...el.com>
To: "kirill.shutemov@...ux.intel.com" <kirill.shutemov@...ux.intel.com>
CC: "Zhang, Tina" <tina.zhang@...el.com>, "Hansen, Dave"
	<dave.hansen@...el.com>, "Yuan, Hang" <hang.yuan@...el.com>, "Huang, Kai"
	<kai.huang@...el.com>, "x86@...nel.org" <x86@...nel.org>, "Chen, Bo2"
	<chen.bo@...el.com>, "sagis@...gle.com" <sagis@...gle.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"seanjc@...gle.com" <seanjc@...gle.com>, "Aktas, Erdem"
	<erdemaktas@...gle.com>, "isaku.yamahata@...il.com"
	<isaku.yamahata@...il.com>, "kvm@...r.kernel.org" <kvm@...r.kernel.org>,
	"Yamahata, Isaku" <isaku.yamahata@...el.com>, "pbonzini@...hat.com"
	<pbonzini@...hat.com>
Subject: Re: [PATCH v19 007/130] x86/virt/tdx: Export SEAMCALL functions

On Mon, 2024-04-22 at 14:46 +0300, kirill.shutemov@...ux.intel.com wrote:
> On Fri, Apr 19, 2024 at 08:04:26PM +0000, Edgecombe, Rick P wrote:
> > On Fri, 2024-04-19 at 17:46 +0300, kirill.shutemov@...ux.intel.com wrote:
> > > 
> > > > Side topic #3, the ud2 to induce panic should be out-of-line.
> > > 
> > > Yeah. I switched to the inline one while debugging one section mismatch
> > > issue and forgot to switch back.
> > 
> > Sorry, why do we need to panic?
> 
> It panics in cases that should never occur if the TDX module is
> functioning properly. For example, TDVMCALL itself should never fail,
> although the leaf function could.

Panic should normally be for desperate situations when horrible things will
likely happen if we continue, right? Why are we adding a panic when we didn't
have one before? Is it a second change, or a side affect of the refactor?