linux-kernel - Re: [PATCHv2 14/29] x86/tdx: Early boot handling of port I/O

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Date:   Wed, 02 Feb 2022 00:02:22 +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,
        x86@...nel.org, linux-kernel@...r.kernel.org,
        "Kirill A . Shutemov" <kirill.shutemov@...ux.intel.com>
Subject: Re: [PATCHv2 14/29] x86/tdx: Early boot handling of port I/O

On Mon, Jan 24 2022 at 18:02, Kirill A. Shutemov wrote:
> This early handler enables the use of normal in*/out* macros without
> patching them for every driver. Since there is no expectation that
> early port I/O is performance-critical, the #VE emulation cost is worth
> the simplicity benefit of not patching the port I/O usage in early
> code. There are also no concerns with nesting, since there should be
> no NMIs or interrupts this early.
>
> Signed-off-by: Andi Kleen <ak@...ux.intel.com>
> Reviewed-by: Dan Williams <dan.j.williams@...el.com>
> Signed-off-by: Kuppuswamy Sathyanarayanan <sathyanarayanan.kuppuswamy@...ux.intel.com>
> Signed-off-by: Kirill A. Shutemov <kirill.shutemov@...ux.intel.com>

Reviewed-by: Thomas Gleixner <tglx@...utronix.de>