linux-kernel - Re: [PATCH v1 3/4] x86/tdx: Allow MMIO from userspace

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Message-ID: <874j867mnd.ffs@tglx>
Date: Tue, 30 Jul 2024 20:36:06 +0200
From: Thomas Gleixner <tglx@...utronix.de>
To: "Alexey Gladkov (Intel)" <legion@...nel.org>,
 linux-kernel@...r.kernel.org, linux-coco@...ts.linux.dev
Cc: Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>, Dave
 Hansen <dave.hansen@...ux.intel.com>, "H. Peter Anvin" <hpa@...or.com>,
 "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.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 v1 3/4] x86/tdx: Allow MMIO from userspace

On Tue, Jul 30 2024 at 19:35, Alexey Gladkov wrote:
> 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: Thomas Gleixner <tglx@...utronix.de>