linux-kernel - Re: [PATCHv6 16/30] x86/boot: Port I/O: add decompression-time support for TDX

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Date:   Thu, 17 Mar 2022 13:15:01 +0100
From:   Thomas Gleixner <tglx@...utronix.de>
To:     "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
        mingo@...hat.com, bp@...en8.de, dave.hansen@...el.com,
        luto@...nel.org, peterz@...radead.org
Cc:     sathyanarayanan.kuppuswamy@...ux.intel.com, aarcange@...hat.com,
        ak@...ux.intel.com, dan.j.williams@...el.com, david@...hat.com,
        hpa@...or.com, jgross@...e.com, jmattson@...gle.com,
        joro@...tes.org, jpoimboe@...hat.com, knsathya@...nel.org,
        pbonzini@...hat.com, sdeep@...are.com, seanjc@...gle.com,
        tony.luck@...el.com, vkuznets@...hat.com, wanpengli@...cent.com,
        thomas.lendacky@....com, brijesh.singh@....com, x86@...nel.org,
        linux-kernel@...r.kernel.org,
        "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
        Dave Hansen <dave.hansen@...ux.intel.com>
Subject: Re: [PATCHv6 16/30] x86/boot: Port I/O: add decompression-time
 support for TDX

On Wed, Mar 16 2022 at 05:08, Kirill A. Shutemov wrote:
>  void early_tdx_detect(void)
>  {
>  	u32 eax, sig[3];
> @@ -23,4 +94,12 @@ void early_tdx_detect(void)
>  
>  	/* Cache TDX guest feature status */
>  	tdx_guest_detected = true;
> +
> +	/* Use hypercalls instead of I/O instructions */
> +	inb = tdx_inb;

Eeew. What's wrong with writing this out?

        pio_ops.inb = tdx_inb;

So it becomes obvious what this is about?

Thanks,

        tglx