linux-kernel - Re: [PATCH v19 030/130] KVM: TDX: Add helper functions to print TDX SEAMCALL error

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Date: Fri, 26 Apr 2024 11:38:40 -0700
From: Isaku Yamahata <isaku.yamahata@...el.com>
To: "Huang, Kai" <kai.huang@...el.com>
Cc: "kvm@...r.kernel.org" <kvm@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"Yamahata, Isaku" <isaku.yamahata@...el.com>,
	"Zhang, Tina" <tina.zhang@...el.com>,
	"seanjc@...gle.com" <seanjc@...gle.com>,
	"Yuan, Hang" <hang.yuan@...el.com>,
	"binbin.wu@...ux.intel.com" <binbin.wu@...ux.intel.com>,
	"Chen, Bo2" <chen.bo@...el.com>,
	"sagis@...gle.com" <sagis@...gle.com>,
	"isaku.yamahata@...il.com" <isaku.yamahata@...il.com>,
	"Aktas, Erdem" <erdemaktas@...gle.com>,
	"pbonzini@...hat.com" <pbonzini@...hat.com>,
	"Yao, Yuan" <yuan.yao@...el.com>, isaku.yamahata@...ux.intel.com
Subject: Re: [PATCH v19 030/130] KVM: TDX: Add helper functions to print TDX
 SEAMCALL error

On Wed, Apr 24, 2024 at 12:11:25AM +0000,
"Huang, Kai" <kai.huang@...el.com> wrote:

> On Mon, 2024-02-26 at 00:25 -0800, isaku.yamahata@...el.com wrote:
> > --- a/arch/x86/kvm/vmx/tdx_ops.h
> > +++ b/arch/x86/kvm/vmx/tdx_ops.h
> > @@ -40,6 +40,10 @@ static inline u64 tdx_seamcall(u64 op, struct tdx_module_args *in,
> >  	return ret;
> >  }
> >  
> > +#ifdef CONFIG_INTEL_TDX_HOST
> > +void pr_tdx_error(u64 op, u64 error_code, const struct tdx_module_args *out);
> > +#endif
> > +
> 
> Why this needs to be inside the CONFIG_INTEL_TDX_HOST while other
> tdh_xxx() don't?
> 
> I suppose all tdh_xxx() together with this pr_tdx_error() should only be
> called tdx.c, which is only built when CONFIG_INTEL_TDX_HOST is true?
> 
> In fact, tdx_seamcall() directly calls seamcall() and seamcall_ret(),
> which are only present when CONFIG_INTEL_TDX_HOST is on.
> 
> So things are really confused here.  I do believe we should just remove
> this CONFIG_INTEL_TDX_HOST around pr_tdx_error() so all functions in
> "tdx_ops.h" should only be used in tdx.c.

You're right, please go clean them up.
-- 
Isaku Yamahata <isaku.yamahata@...el.com>