linux-kernel - Re: [PATCH v12 12/21] x86/xen: Add xen_cpuid() and xen_setup

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Date:	Wed, 9 Sep 2015 14:31:01 +0100
From:	David Vrabel <david.vrabel@...rix.com>
To:	Josh Poimboeuf <jpoimboe@...hat.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>, <x86@...nel.org>
CC:	<linux-kernel@...r.kernel.org>, <live-patching@...r.kernel.org>,
	"Michal Marek" <mmarek@...e.cz>,
	Peter Zijlstra <peterz@...radead.org>,
	"Andy Lutomirski" <luto@...nel.org>,
	Borislav Petkov <bp@...en8.de>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andi Kleen <andi@...stfloor.org>,
	"Pedro Alves" <palves@...hat.com>,
	Namhyung Kim <namhyung@...il.com>,
	"Bernd Petrovitsch" <bernd@...rovitsch.priv.at>,
	Chris J Arges <chris.j.arges@...onical.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
	Boris Ostrovsky <boris.ostrovsky@...cle.com>
Subject: Re: [PATCH v12 12/21] x86/xen: Add xen_cpuid() and xen_setup_gdt()
 to stacktool whitelists

On 09/09/15 14:21, Josh Poimboeuf wrote:
> stacktool reports the following false positive warnings:
> 
>   stacktool: arch/x86/xen/enlighten.o: xen_cpuid()+0x41: can't find jump dest instruction at .text+0x108
>   stacktool: arch/x86/xen/enlighten.o: xen_setup_gdt.constprop.23()+0x2e: kernel entry/exit from callable instruction
> 
> The first warning is due to xen_cpuid()'s use of XEN_EMULATE_PREFIX to
> insert some fake instructions which stacktool doesn't know how to
> decode.
> 
> The second warning is due to xen_setup_gdt()'s use of an lret
> instruction, which stacktool normally doesn't allow in callable
> functions.  But this seems to be a valid use of the instruction.
> 
> Add both functions to the stacktool whitelist.

Reviewed-by: David Vrabel <david.vrabel@...rix.com>

David
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