linux-kernel - Re: [PATCH v4 3/6] x86/tdx: Allow MMIO from userspace

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Message-ID: <ur5ocxcpe33kw4qp5k4wrlgnxvgnj4a33wydwxibysfgkqh5aq@z5fm6fdk2266>
Date: Thu, 22 Aug 2024 10:18:47 +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 v4 3/6] x86/tdx: Allow MMIO from userspace

On Wed, Aug 21, 2024 at 04:24:35PM +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. Additional checks have been added previously.
> 
> Reviewed-by: Thomas Gleixner <tglx@...utronix.de>
> Signed-off-by: Alexey Gladkov (Intel) <legion@...nel.org>

So, you've picked up Thomas' Reviwed-by, but lost mine? :P

-- 
  Kiryl Shutsemau / Kirill A. Shutemov