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Date:   Fri, 26 Aug 2022 11:54:34 +0200
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Subject: Re: WARNING: CPU: 1 PID: 83 at arch/x86/kernel/cpu/sgx/main.c:446
 ksgxd+0x1b7/0x1d0
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To:     Haitao Huang <haitao.huang@linux.intel.com>,
        Dave Hansen <dave.hansen@intel.com>,
        Jarkko Sakkinen <jarkko@kernel.org>,
        Thomas Gleixner <tglx@linutronix.de>,
        Ingo Molnar <mingo@redhat.com>, Borislav Petkov <bp@alien8.de>,
        x86@kernel.org, Reinette Chatre <reinette.chatre@intel.com>
Cc:     linux-sgx@vger.kernel.org, LKML <linux-kernel@vger.kernel.org>
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 <op.1rfpqgjrwjvjmi@hhuan26-mobl1.mshome.net>
From:   Paul Menzel <pmenzel@molgen.mpg.de>
In-Reply-To: <op.1rfpqgjrwjvjmi@hhuan26-mobl1.mshome.net>
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Dear Haitao,


Thank you for your reply. Just for the record:

Am 25.08.22 um 04:12 schrieb Haitao Huang:

> On Tue, 23 Aug 2022 08:48:52 -0500, Paul Menzel wrote:

>> Am 20.08.22 um 08:13 schrieb Paul Menzel:
>>
>>> Am 19.08.22 um 20:28 schrieb Dave Hansen:
>>>> On 8/19/22 09:02, Paul Menzel wrote:
>>>>> On the Dell XPS 13 9370, Linux 5.18.16 prints the warning below:
>>>>>
>>>>> ```
>>>>> [    0.000000] Linux version 5.18.0-4-amd64 (debian-kernel@lists.debian.org) (gcc-11 (Debian 11.3.0-5) 11.3.0, GNU ld (GNU Binutils for Debian) 2.38.90.20220713) #1 SMP PREEMPT_DYNAMIC Debian 5.18.16-1 (2022-08-10)
>>>>> [    0.000000] Command line: BOOT_IMAGE=/vmlinuz-5.18.0-4-amd64 root=UUID=56f398e0-1e25-4fda-aa9f-611dece4b333 ro quiet
>>>>> […]
>>>>> [    0.000000] DMI: Dell Inc. XPS 13 9370/0RMYH9, BIOS 1.21.0 07/06/2022
>>>>> […]
>>>>> [    0.235418] sgx: EPC section 0x40200000-0x45f7ffff
>>>
>>>> Would you be able to send the entire dmesg, along with:
>>>  The log message are attached to the first message, where I missed to 
>>> carbon-copy linux-sgx@ [1].
>>>
>>>>     cat /proc/iomem # (as root)
>>>> and
>>>>     cpuid -1 --raw
>>>  I am going to provide that next week. (Side note, Intel might have 
>>> some Dell XPS 9370 test machines in some QA lab.)
>>
>> Please find both outputs at the end of the file.
> 
> Could you also check output of "sudo rdmsr -x 0x3a"?

40005

> Also was CONFIG_X86_SGX_KVM set?

No, it’s not set in Debian’s Linux kernel configuration.

> If CONFIG_X86_SGX_KVM is not set and bit 17 (SGX_LC) of the MSR 3A not set,
> then I think following sequence during sgx_init is possible:

40005 = 0x09c45, so bit 17 (if starting from 0) is 0.

[…]


Kind regards,

Paul