linux-kernel - Re: [PATCH v1 01/14] x86/realmode: remove I/O port paravirtualization

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Message-ID: <aXDF-TzkcansvuiC@thinkstation>
Date: Wed, 21 Jan 2026 12:27:01 +0000
From: Kiryl Shutsemau <kas@...nel.org>
To: "H. Peter Anvin" <hpa@...or.com>
Cc: Thomas Gleixner <tglx@...nel.org>, Ingo Molnar <mingo@...hat.com>, 
	Borislav Petkov <bp@...en8.de>, Dave Hansen <dave.hansen@...ux.intel.com>, 
	Uros Bizjak <ubizjak@...il.com>, Petr Mladek <pmladek@...e.com>, 
	Andrew Morton <akpm@...ux-foundation.org>, Kees Cook <kees@...nel.org>, 
	"Peter Zijlstra (Intel)" <peterz@...radead.org>, Nathan Chancellor <nathan@...nel.org>, 
	Rick Edgecombe <rick.p.edgecombe@...el.com>, linux-kernel@...r.kernel.org, linux-coco@...ts.linux.dev, 
	x86@...nel.org
Subject: Re: [PATCH v1 01/14] x86/realmode: remove I/O port paravirtualization

On Tue, Jan 20, 2026 at 11:53:53AM -0800, H. Peter Anvin wrote:
> In commit:
> 
> eb4ea1ae8f45 x86/boot: Port I/O: Allow to hook up alternative helpers
> 
> ... paravirtualization hooks were added to (some!) of the port I/O
> functions. However, they were only ever used in the 32/64-bit
> "compressed" directory, and never made any sense in the real-mode
> code, which is notoriously size sensitive.
> 
> Without these hooks, <asm/shared/io.h> is usable directly, so mode
> io.h into the compressed/ directory and replace "io.h" with
> <asm/shared/io.h> for the actual real-mode code.
> 
> Signed-off-by: H. Peter Anvin (Intel) <hpa@...or.com>

Acked-by: Kiryl Shutsemau <kas@...nel.org>

-- 
  Kiryl Shutsemau / Kirill A. Shutemov