linux-kernel - Re: [qemu64,+smep,+smap] WARNING: CPU: 1 PID: 0 at arch/x86/kernel/cpu/amd.c:220 init

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Message-ID: <53195336.9080606@linux.intel.com>
Date:	Thu, 06 Mar 2014 21:03:50 -0800
From:	"H. Peter Anvin" <hpa@...ux.intel.com>
To:	Fengguang Wu <fengguang.wu@...el.com>,
	Andreas Herrmann <andreas.herrmann3@....com>
CC:	Ingo Molnar <mingo@...e.hu>,
	Borislav Petkov <borislav.petkov@....com>,
	Yinghai Lu <yhlu.kernel@...il.com>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [qemu64,+smep,+smap] WARNING: CPU: 1 PID: 0 at arch/x86/kernel/cpu/amd.c:220
 init_amd()

On 03/06/2014 05:58 PM, Fengguang Wu wrote:
> Hi all,
> 
> I find the below WARNING shows up only in
> 
>         qemu-system-x86_64 -cpu qemu64,+smep,+smap
> 

Yes, it is because Qemu doesn't show the AMD-specific SMP CPUID bit.
It's harmless in that sense.

Unfortunately these things are hard to fix in Qemu.

	-hpa

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