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

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Date: Wed, 24 Apr 2024 00:11:25 +0000
From: "Huang, Kai" <kai.huang@...el.com>
To: "kvm@...r.kernel.org" <kvm@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>, "Yamahata,
 Isaku" <isaku.yamahata@...el.com>
CC: "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>
Subject: Re: [PATCH v19 030/130] KVM: TDX: Add helper functions to print TDX
 SEAMCALL error

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.