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Message-ID: <d5b57049-419b-3bbb-dc8d-97e4024965df@intel.com>
Date: Tue, 30 Oct 2018 11:03:51 -0700
From: Dave Hansen <dave.hansen@...el.com>
To: Matthew Wilcox <willy@...radead.org>,
Andy Lutomirski <luto@...capital.net>
Cc: Kees Cook <keescook@...omium.org>, Peter Zijlstra <peterz@...radead.org>,
Igor Stoppa <igor.stoppa@...il.com>, Mimi Zohar <zohar@...ux.vnet.ibm.com>,
Dave Chinner <david@...morbit.com>, James Morris <jmorris@...ei.org>,
Michal Hocko <mhocko@...nel.org>,
Kernel Hardening <kernel-hardening@...ts.openwall.com>,
linux-integrity <linux-integrity@...r.kernel.org>,
linux-security-module <linux-security-module@...r.kernel.org>,
Igor Stoppa <igor.stoppa@...wei.com>,
Dave Hansen <dave.hansen@...ux.intel.com>, Jonathan Corbet <corbet@....net>,
Laura Abbott <labbott@...hat.com>, Randy Dunlap <rdunlap@...radead.org>,
Mike Rapoport <rppt@...ux.vnet.ibm.com>,
"open list:DOCUMENTATION" <linux-doc@...r.kernel.org>,
LKML <linux-kernel@...r.kernel.org>, Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [PATCH 10/17] prmem: documentation
On 10/30/18 10:58 AM, Matthew Wilcox wrote:
> Does this satisfy Igor's requirements? We wouldn't be able to
> copy_to/from_user() while rare_mm was active. I think that's a feature
> though! It certainly satisfies my interests (kernel code be able to
> mark things as dynamically-allocated-and-read-only-after-initialisation)
It has to be more than copy_to/from_user(), though, I think.
rare_modify(q) either has to preempt_disable(), or we need to teach the
context-switching code when and how to switch in/out of the rare_mm.
preempt_disable() would also keep us from sleeping.
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