linux-kernel - Re: [PATCH v5 12/18] x86/sgx: Add EPC OOM path to forcefully reclaim EPC

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Message-ID: <24714c0355a667e4739a51c46c921e014582b8cd.camel@intel.com>
Date:   Mon, 16 Oct 2023 11:02:56 +0000
From:   "Huang, Kai" <kai.huang@...el.com>
To:     "Christopherson,, Sean" <seanjc@...gle.com>,
        "haitao.huang@...ux.intel.com" <haitao.huang@...ux.intel.com>
CC:     "Zhang, Bo" <zhanb@...rosoft.com>,
        "linux-sgx@...r.kernel.org" <linux-sgx@...r.kernel.org>,
        "cgroups@...r.kernel.org" <cgroups@...r.kernel.org>,
        "yangjie@...rosoft.com" <yangjie@...rosoft.com>,
        "dave.hansen@...ux.intel.com" <dave.hansen@...ux.intel.com>,
        "Li, Zhiquan1" <zhiquan1.li@...el.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "mingo@...hat.com" <mingo@...hat.com>,
        "tglx@...utronix.de" <tglx@...utronix.de>,
        "tj@...nel.org" <tj@...nel.org>,
        "anakrish@...rosoft.com" <anakrish@...rosoft.com>,
        "jarkko@...nel.org" <jarkko@...nel.org>,
        "hpa@...or.com" <hpa@...or.com>,
        "mikko.ylinen@...ux.intel.com" <mikko.ylinen@...ux.intel.com>,
        "Mehta, Sohil" <sohil.mehta@...el.com>,
        "bp@...en8.de" <bp@...en8.de>, "x86@...nel.org" <x86@...nel.org>,
        "kristen@...ux.intel.com" <kristen@...ux.intel.com>
Subject: Re: [PATCH v5 12/18] x86/sgx: Add EPC OOM path to forcefully reclaim
 EPC

On Wed, 2023-10-11 at 01:14 +0000, Huang, Kai wrote:
> On Tue, 2023-10-10 at 11:49 -0500, Haitao Huang wrote:
> > > 
> > > This patch adds SGX_ENCL_NO_MEMORY.  I guess we can use it for virtual  
> > > EPC too?
> > > 
> > 
> > That flag is set for enclaves, do you mean we set similar flag in vepc  
> > struct?
> 
> Yes.

I missed the "ENCL" part but only noted the "NO_MEMORY" part, so I guess it
should not be used directly for vEPC.  So if it is needed, SGX_VEPC_NO_MEMORY,
or a simple 'bool dead' or similar in 'struct sgx_vepc' is more suitable.

As I said I was fighting with fever and headache last week :-)