linux-kernel - Re: [PATCH v7 04/12] x86/cpufeatures: Add TDX Guest CPU feature

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Date:   Thu, 23 Sep 2021 16:16:45 +0200
From:   Borislav Petkov <bp@...en8.de>
To:     "Kuppuswamy, Sathyanarayanan" 
        <sathyanarayanan.kuppuswamy@...ux.intel.com>
Cc:     Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, x86@...nel.org,
        Paolo Bonzini <pbonzini@...hat.com>,
        Juergen Gross <jgross@...e.com>, Deep Shah <sdeep@...are.com>,
        VMware Inc <pv-drivers@...are.com>,
        Vitaly Kuznetsov <vkuznets@...hat.com>,
        Wanpeng Li <wanpengli@...cent.com>,
        Jim Mattson <jmattson@...gle.com>,
        Joerg Roedel <joro@...tes.org>, Peter H Anvin <hpa@...or.com>,
        Dave Hansen <dave.hansen@...el.com>,
        Tony Luck <tony.luck@...el.com>,
        Dan Williams <dan.j.williams@...el.com>,
        Andi Kleen <ak@...ux.intel.com>,
        Kirill Shutemov <kirill.shutemov@...ux.intel.com>,
        Sean Christopherson <seanjc@...gle.com>,
        Kuppuswamy Sathyanarayanan <knsathya@...nel.org>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v7 04/12] x86/cpufeatures: Add TDX Guest CPU feature

On Thu, Sep 23, 2021 at 07:10:00AM -0700, Kuppuswamy, Sathyanarayanan wrote:
> Initially, tdx_early_init() was added between kasan_early_init() and
> idt_setup_early_handler() in x86_64_start_kernel(). But I found that
> we have requirement to parse command line params in future
> changes to tdx_early_init() (not from the patches in this series). Since
> command line pointer is getting initialized in copy_bootdata(), I want
> move the tdx_early_init() call below it. Instead of moving the initialization
> order in future, I thought to move it appropriate place in the initial
> patch. Regarding IDT dependency, #VE handling will have a dependency on
> it (so it is better to initialize it before tdx_early_init()).

Then in your next version, pls add a comment that goes like this:

	/*
	 * This call needs to be here because...
	 * 	<insert reasons>
	 */

So that it is clear that its placement is special.

-- 
Regards/Gruss,
    Boris.

https://people.kernel.org/tglx/notes-about-netiquette