linux-kernel - Re: [PATCH v12 14/14] selftests/sgx: Add scripts for EPC cgroup testing

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Date: Wed, 24 Apr 2024 14:42:03 -0500
From: "Haitao Huang" <haitao.huang@...ux.intel.com>
To: dave.hansen@...ux.intel.com, kai.huang@...el.com, tj@...nel.org,
 mkoutny@...e.com, linux-kernel@...r.kernel.org, linux-sgx@...r.kernel.org,
 x86@...nel.org, cgroups@...r.kernel.org, tglx@...utronix.de, mingo@...hat.com,
 bp@...en8.de, hpa@...or.com, sohil.mehta@...el.com,
 tim.c.chen@...ux.intel.com, "Jarkko Sakkinen" <jarkko@...nel.org>
Cc: zhiquan1.li@...el.com, kristen@...ux.intel.com, seanjc@...gle.com,
 zhanb@...rosoft.com, anakrish@...rosoft.com, mikko.ylinen@...ux.intel.com,
 yangjie@...rosoft.com, chrisyan@...rosoft.com
Subject: Re: [PATCH v12 14/14] selftests/sgx: Add scripts for EPC cgroup
 testing

Hi Jarkko
On Tue, 16 Apr 2024 11:08:11 -0500, Jarkko Sakkinen <jarkko@...nel.org>  
wrote:

> On Tue Apr 16, 2024 at 5:54 PM EEST, Haitao Huang wrote:
>> I did declare the configs in the config file but I missed it in my patch
>> as stated earlier. IIUC, that would not cause this error though.
>>
>> Maybe I should exit with the skip code if no CGROUP_MISC (no more
>> CGROUP_SGX_EPC) is configured?
> OK, so I wanted to do a distro kernel test here, and used the default
> OpenSUSE kernel config. I need to check if it has CGROUP_MISC set.

I couldn't figure out why this failure you have encountered. I think  
OpenSUSE kernel most likely config CGROUP_MISC.

Also if CGROUP_MISC not set, then there should be error happen earlier on  
echoing "+misc" to cgroup.subtree_control at line 20. But your log  
indicates only error on echoing "sgx_epc ..." to  
/sys/fs/cgroup/...//misc.max.

I can only speculate that can could happen (if sgx epc cgroup was compiled  
in) when the cgroup-fs subdirectories in question already have populated  
config that is conflicting with the scripts.

Could you double check or start from a clean environment?
Thanks
Haitao