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 23:15:47 +0300
From:   "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>
To:     Thomas Gleixner <tglx@...utronix.de>
Cc:     mingo@...hat.com, bp@...en8.de, dave.hansen@...el.com,
        luto@...nel.org, peterz@...radead.org,
        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,
        Dave Hansen <dave.hansen@...ux.intel.com>
Subject: Re: [PATCHv6 16/30] x86/boot: Port I/O: add decompression-time
 support for TDX

On Thu, Mar 17, 2022 at 01:15:01PM +0100, Thomas Gleixner wrote:
> 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?

This leads to preprocessor hell: "pio_ops.inb" is expanded to
"pio_ops.pio_ops.inb" :/

I can rename fields in struct port_io_ops to avoid conflicts, I donno.

-- 
 Kirill A. Shutemov