linux-kernel - Re: [PATCH v1 0/8] x86_64 SandBox Mode arch hooks

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Date: Wed, 14 Feb 2024 19:22:14 +0100
From: Petr Tesařík <petr@...arici.cz>
To: Dave Hansen <dave.hansen@...el.com>
Cc: Petr Tesarik <petrtesarik@...weicloud.com>, Jonathan Corbet
 <corbet@....net>, Thomas Gleixner <tglx@...utronix.de>, Ingo Molnar
 <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>, Dave Hansen
 <dave.hansen@...ux.intel.com>, "maintainer:X86 ARCHITECTURE (32-BIT AND
 64-BIT)" <x86@...nel.org>, "H. Peter Anvin" <hpa@...or.com>, Andy
 Lutomirski <luto@...nel.org>, Oleg Nesterov <oleg@...hat.com>, Peter
 Zijlstra <peterz@...radead.org>, Xin Li <xin3.li@...el.com>, Arnd Bergmann
 <arnd@...db.de>, Andrew Morton <akpm@...ux-foundation.org>, Rick Edgecombe
 <rick.p.edgecombe@...el.com>, Kees Cook <keescook@...omium.org>, "Masami
 Hiramatsu (Google)" <mhiramat@...nel.org>, Pengfei Xu
 <pengfei.xu@...el.com>, Josh Poimboeuf <jpoimboe@...nel.org>, Ze Gao
 <zegao2021@...il.com>, "Kirill A. Shutemov"
 <kirill.shutemov@...ux.intel.com>, Kai Huang <kai.huang@...el.com>, David
 Woodhouse <dwmw@...zon.co.uk>, Brian Gerst <brgerst@...il.com>, Jason
 Gunthorpe <jgg@...pe.ca>, Joerg Roedel <jroedel@...e.de>, "Mike Rapoport
 (IBM)" <rppt@...nel.org>, Tina Zhang <tina.zhang@...el.com>, Jacob Pan
 <jacob.jun.pan@...ux.intel.com>, "open list:DOCUMENTATION"
 <linux-doc@...r.kernel.org>, open list <linux-kernel@...r.kernel.org>,
 Roberto Sassu <roberto.sassu@...weicloud.com>, Petr Tesarik
 <petr.tesarik1@...wei-partners.com>
Subject: Re: [PATCH v1 0/8] x86_64 SandBox Mode arch hooks

On Wed, 14 Feb 2024 06:52:53 -0800
Dave Hansen <dave.hansen@...el.com> wrote:

> On 2/14/24 03:35, Petr Tesarik wrote:
> > This patch series implements x86_64 arch hooks for the generic SandBox
> > Mode infrastructure.  
> 
> I think I'm missing a bit of context here.  What does one _do_ with
> SandBox Mode?  Why is it useful?

I see, I split the patch series into the base infrastructure and the
x86_64 implementation, but I forgot to merge the two recipient lists.
:-(

Anyway, in the long term I would like to work on gradual decomposition
of the kernel into a core part and many self-contained components.
Sandbox mode is a useful tool to enforce isolation.

In its current form, sandbox mode is too limited for that, but I'm
trying to find some balance between "publish early" and reaching a
feature level where some concrete examples can be shown. I'd rather
fail fast than maintain hundreds of patches in an out-of-tree branch
before submitting (and failing anyway).

Petr T