linux-kernel - Re: [PATCH v11 07/20] x86/virt/tdx: Add skeleton to enable TDX on demand

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Date:   Mon, 5 Jun 2023 14:23:03 -0700
From:   Isaku Yamahata <isaku.yamahata@...il.com>
To:     Kai Huang <kai.huang@...el.com>
Cc:     linux-kernel@...r.kernel.org, kvm@...r.kernel.org,
        linux-mm@...ck.org, dave.hansen@...el.com,
        kirill.shutemov@...ux.intel.com, tony.luck@...el.com,
        peterz@...radead.org, tglx@...utronix.de, seanjc@...gle.com,
        pbonzini@...hat.com, david@...hat.com, dan.j.williams@...el.com,
        rafael.j.wysocki@...el.com, ying.huang@...el.com,
        reinette.chatre@...el.com, len.brown@...el.com, ak@...ux.intel.com,
        isaku.yamahata@...el.com, chao.gao@...el.com,
        sathyanarayanan.kuppuswamy@...ux.intel.com, bagasdotme@...il.com,
        sagis@...gle.com, imammedo@...hat.com, isaku.yamahata@...il.com
Subject: Re: [PATCH v11 07/20] x86/virt/tdx: Add skeleton to enable TDX on
 demand

On Mon, Jun 05, 2023 at 02:27:20AM +1200,
Kai Huang <kai.huang@...el.com> wrote:

> diff --git a/arch/x86/include/asm/tdx.h b/arch/x86/include/asm/tdx.h
> index b489b5b9de5d..03f74851608f 100644
> --- a/arch/x86/include/asm/tdx.h
> +++ b/arch/x86/include/asm/tdx.h
> @@ -102,8 +102,12 @@ static inline long tdx_kvm_hypercall(unsigned int nr, unsigned long p1,
>  
>  #ifdef CONFIG_INTEL_TDX_HOST
>  bool platform_tdx_enabled(void);
> +int tdx_cpu_enable(void);
> +int tdx_enable(void);
>  #else	/* !CONFIG_INTEL_TDX_HOST */
>  static inline bool platform_tdx_enabled(void) { return false; }
> +static inline int tdx_cpu_enable(void) { return -ENODEV; }
> +static inline int tdx_enable(void)  { return -ENODEV; }
>  #endif	/* CONFIG_INTEL_TDX_HOST */
>  
>  #endif /* !__ASSEMBLY__ */

Please include errno.h.
In the case of !INTEL_TDX_HOST && INTEL_TDX_GUEST,
drivers/virt/coco/tdx-guest/tdx-guest.c results in compile error.

Although there are other files that include asm/tdx.h, they seem to luckily
include errno.h directly or indirectly.
-- 
Isaku Yamahata <isaku.yamahata@...il.com>