From: Dave Hansen <dave.hansen@intel.com>
To: Thomas Gleixner <tglx@linutronix.de>,
LKML <linux-kernel@vger.kernel.org>
Cc: x86@kernel.org, Peter Zijlstra <peterz@infradead.org>,
Bin Yang <bin.yang@intel.com>, Mark Gross <mark.gross@intel.com>
Subject: Re: [patch V3 05/11] x86/mm/cpa: Add debug mechanism
Date: Fri, 21 Sep 2018 09:40:36 -0700 [thread overview]
Message-ID: <24b0749f-d472-bd6b-4397-e59e01b3a9df@intel.com> (raw)
In-Reply-To: <20180917143546.078998733@linutronix.de>
On 09/17/2018 07:29 AM, Thomas Gleixner wrote:
> The whole static protection magic is silently fixing up anything which is
> handed in. That's just wrong. The offending call sites need to be fixed.
>
> Add a debug mechanism which emits a warning if a requested mapping needs to be
> fixed up. The DETECT debug mechanism is really not meant to be enabled except
> for developers, so limit the output hard to the protection fixups.
...
> +enum cpa_warn {
> + CPA_PROTECT,
> + CPA_DETECT,
> +};
> +
> +static const int cpa_warn_level = CPA_PROTECT;
Even if this is intended for developers only, should we also add some
config option here so things like 0day can still get warnings out of this?
Reviewed-by: Dave Hansen <dave.hansen@intel.com>
next prev parent reply other threads:[~2018-09-21 16:40 UTC|newest]
Thread overview: 42+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-09-17 14:29 [patch V3 00/11] x86/mm/cpa: Improve large page preservation handling Thomas Gleixner
2018-09-17 14:29 ` [patch V3 01/11] x86/mm/init32: Mark text and rodata RO in one go Thomas Gleixner
2018-09-21 16:15 ` Dave Hansen
2018-09-27 18:45 ` [tip:x86/mm] " tip-bot for Thomas Gleixner
2018-09-17 14:29 ` [patch V3 02/11] x86/mm/cpa: Split, rename and clean up try_preserve_large_page() Thomas Gleixner
2018-09-18 7:03 ` Peter Zijlstra
2018-09-18 8:19 ` Peter Zijlstra
2018-09-18 12:14 ` Peter Zijlstra
2018-09-18 22:34 ` Thomas Gleixner
2018-09-21 16:22 ` Dave Hansen
2018-09-27 18:46 ` [tip:x86/mm] " tip-bot for Thomas Gleixner
2018-09-17 14:29 ` [patch V3 03/11] x86/mm/cpa: Rework static_protections() Thomas Gleixner
2018-09-21 16:33 ` Dave Hansen
2018-09-27 18:46 ` [tip:x86/mm] " tip-bot for Thomas Gleixner
2018-09-17 14:29 ` [patch V3 04/11] x86/mm/cpa: Allow range check for static protections Thomas Gleixner
2018-09-21 16:36 ` Dave Hansen
2018-09-27 18:47 ` [tip:x86/mm] " tip-bot for Thomas Gleixner
2018-09-17 14:29 ` [patch V3 05/11] x86/mm/cpa: Add debug mechanism Thomas Gleixner
2018-09-21 16:40 ` Dave Hansen [this message]
2018-09-22 10:33 ` Peter Zijlstra
2018-09-27 18:48 ` [tip:x86/mm] " tip-bot for Thomas Gleixner
2018-09-17 14:29 ` [patch V3 06/11] x86/mm/cpa: Add large page preservation statistics Thomas Gleixner
2018-09-21 19:59 ` Dave Hansen
2018-09-27 18:48 ` [tip:x86/mm] " tip-bot for Thomas Gleixner
2018-09-17 14:29 ` [patch V3 07/11] x86/mm/cpa: Avoid static protection checks on unmap Thomas Gleixner
2018-09-21 20:01 ` Dave Hansen
2018-09-27 18:49 ` [tip:x86/mm] " tip-bot for Thomas Gleixner
2018-09-17 14:29 ` [patch V3 08/11] x86/mm/cpa: Add sanity check for existing mappings Thomas Gleixner
2018-09-18 7:14 ` Peter Zijlstra
2018-09-21 20:07 ` Dave Hansen
2018-09-27 18:49 ` [tip:x86/mm] " tip-bot for Thomas Gleixner
2018-09-17 14:29 ` [patch V3 09/11] x86/mm/cpa: Optimize same protection check Thomas Gleixner
2018-09-21 20:12 ` Dave Hansen
2018-09-27 18:07 ` Thomas Gleixner
2018-09-27 18:50 ` [tip:x86/mm] " tip-bot for Thomas Gleixner
2018-09-17 14:29 ` [patch V3 10/11] x86/mm/cpa: Do the range check early Thomas Gleixner
2018-09-21 20:26 ` Dave Hansen
2018-09-27 18:50 ` [tip:x86/mm] " tip-bot for Thomas Gleixner
2018-09-17 14:29 ` [patch V3 11/11] x86/mm/cpa: Avoid the 4k pages check completely Thomas Gleixner
2018-09-21 20:32 ` Dave Hansen
2018-09-27 18:51 ` [tip:x86/mm] " tip-bot for Thomas Gleixner
2018-11-10 15:01 [patch V3 05/11] x86/mm/cpa: Add debug mechanism Jordan Glover
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