linux-kernel - Re: [PATCH 4/8] x86: Add support for rd/wr fs/gs base

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Message-ID: <20150410231634.GE2366@two.firstfloor.org>
Date:	Sat, 11 Apr 2015 01:16:35 +0200
From:	Andi Kleen <andi@...stfloor.org>
To:	Andi Kleen <andi@...stfloor.org>
Cc:	Andy Lutomirski <luto@...capital.net>,
	Andi Kleen <ak@...ux.intel.com>, X86 ML <x86@...nel.org>,
	Andrew Lutomirski <luto@...nel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Steven Rostedt <rostedt@...dmis.org>,
	Borislav Petkov <bp@...en8.de>, JBeulich@...e.com
Subject: Re: [PATCH 4/8] x86: Add support for rd/wr fs/gs base

On Sat, Apr 11, 2015 at 01:05:46AM +0200, Andi Kleen wrote:
> > One might argue that this code serves no purpose, but it's there, so
> > we had better keep our per-invocation usage of DEBUG_STACK within 4k.
> 
> Only if you run NKLD. I doubt KDB or GDB support nesting.
> We can ask Jan if he still uses it.

Thinking about it more we likely still need it for kprobes,
in case someone sets them into the int3 or debug path.

-Andi

-- 
ak@...ux.intel.com -- Speaking for myself only.
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