On 02/13/2014 06:55 AM, H. Peter Anvin wrote:
> 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.
>
No, it is simply a second kernel bug. I have patches for both and will
push them momentarily.
-hpa
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