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

[H. Peter Anvin]

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

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/