linux-kernel - Re: [EXTERNAL] Re: [PATCH] x86/tdx: Generate SIGBUS on userspace MMIO

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Message-ID: <vunn4hhfwkmxgspbxthy2w2vf67m7662r2dj324td3t6qkiegw@zp5dbgfgqmoh>
Date: Wed, 12 Jun 2024 12:46:37 +0300
From: "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>
To: Jeremi Piotrowski <jpiotrowski@...ux.microsoft.com>
Cc: Chris Oo <cho@...rosoft.com>, Dave Hansen <dave.hansen@...el.com>, 
	Dave Hansen <dave.hansen@...ux.intel.com>, Thomas Gleixner <tglx@...utronix.de>, 
	Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>, 
	"x86@...nel.org" <x86@...nel.org>, "H. Peter Anvin" <hpa@...or.com>, 
	"linux-coco@...ts.linux.dev" <linux-coco@...ts.linux.dev>, "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>, 
	Dexuan Cui <decui@...rosoft.com>, John Starks <John.Starks@...rosoft.com>
Subject: Re: [EXTERNAL] Re: [PATCH] x86/tdx: Generate SIGBUS on userspace MMIO

On Tue, Jun 11, 2024 at 07:25:27PM +0200, Jeremi Piotrowski wrote:
> Is there a reason we can't fix the handler to do the #VE->mmio emulation
> for userspace too, so that this scenario works just like outside of a
> CVM?

We are looking into it. It requires some groundwork to properly understand
risks of wider attack surface. I think we will get there, but it will take time.

-- 
  Kiryl Shutsemau / Kirill A. Shutemov