linux-kernel - Re: [qemu64,+smep,+smap] Kernel panic - not syncing: No working init found.

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Message-ID: <52FCDCE5.4010301@zytor.com>
Date:	Thu, 13 Feb 2014 06:55:33 -0800
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Fengguang Wu <fengguang.wu@...el.com>, kvm <kvm@...r.kernel.org>
CC:	LKML <linux-kernel@...r.kernel.org>,
	Ingo Molnar <mingo@...nel.org>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [qemu64,+smep,+smap] Kernel panic - not syncing: No working init
 found.

On 02/13/2014 04:45 AM, Fengguang Wu wrote:
> Greetings,
> 
> I find that when running
> 
>         qemu-system-x86_64 -cpu qemu64,+smep,+smap
> 
> Some kernels will 100% produce this error, where the error code
> -13,-14 are -EACCES and -EFAULT:
> 
> Any ideas?
> 

I notice this is a non-SMAP kernel:

# CONFIG_X86_SMAP is not set

If the kernel turns on SMAP in CR4 even though SMAP isn't enabled in the
kernel, that is a kernel bug.  If Qemu enforces SMAP even if it is
turned off in CR4, that would be a Qemu bug.  I have reproduced the
failure locally and an am considering both possibilities now.

	-hpa

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