linux-kernel - Re: [PATCH v3 03/10] x86/tdx: Allow MMIO from userspace

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Message-ID: <kzd355wuaf5bphybast36u3svr76glvxr5fni6vfiiwbc7zotv@uikypstswh6h>
Date: Mon, 19 Aug 2024 13:46:34 +0300
From: "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>
To: Alexey Gladkov <legion@...nel.org>
Cc: linux-kernel@...r.kernel.org, linux-coco@...ts.linux.dev, 
	Thomas Gleixner <tglx@...utronix.de>, Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>, 
	Dave Hansen <dave.hansen@...ux.intel.com>, "H. Peter Anvin" <hpa@...or.com>, 
	Andrew Morton <akpm@...ux-foundation.org>, Yuan Yao <yuan.yao@...el.com>, 
	Geert Uytterhoeven <geert@...ux-m68k.org>, Yuntao Wang <ytcoode@...il.com>, Kai Huang <kai.huang@...el.com>, 
	Baoquan He <bhe@...hat.com>, Oleg Nesterov <oleg@...hat.com>, cho@...rosoft.com, 
	decui@...rosoft.com, John.Starks@...rosoft.com
Subject: Re: [PATCH v3 03/10] x86/tdx: Allow MMIO from userspace

On Fri, Aug 16, 2024 at 03:43:53PM +0200, Alexey Gladkov wrote:
> From: "Alexey Gladkov (Intel)" <legion@...nel.org>
> 
> The MMIO emulation is only allowed for kernel space code. It is carried
> out through a special API, which uses only certain instructions.
> 
> This does not allow userspace to work with virtual devices.
> 
> Allow userspace to use the same instructions as kernel space to access
> MMIO. So far, no additional checks have been made.
> 
> Signed-off-by: Alexey Gladkov (Intel) <legion@...nel.org>

Reviewed-by: Kirill A. Shutemov <kirill.shutemov@...ux.intel.com>

And you seem to lost Reviewed-by from Thomas:

https://lore.kernel.org/all/874j867mnd.ffs@tglx

-- 
  Kiryl Shutsemau / Kirill A. Shutemov