linux-kernel - Re: [PATCH v5] x86/sgx: Resolves SECS reclaim vs. page fault for EAUG race

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Date:   Thu, 27 Jul 2023 03:11:50 +0000
From:   "Huang, Kai" <kai.huang@...el.com>
To:     "linux-sgx@...r.kernel.org" <linux-sgx@...r.kernel.org>,
        "dave.hansen@...ux.intel.com" <dave.hansen@...ux.intel.com>,
        "x86@...nel.org" <x86@...nel.org>,
        "jarkko@...nel.org" <jarkko@...nel.org>,
        "Chatre, Reinette" <reinette.chatre@...el.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "tglx@...utronix.de" <tglx@...utronix.de>,
        "bp@...en8.de" <bp@...en8.de>,
        "haitao.huang@...ux.intel.com" <haitao.huang@...ux.intel.com>,
        "hpa@...or.com" <hpa@...or.com>,
        "mingo@...hat.com" <mingo@...hat.com>
CC:     "kristen@...ux.intel.com" <kristen@...ux.intel.com>,
        "Mehta, Sohil" <sohil.mehta@...el.com>,
        "stable@...r.kernel.org" <stable@...r.kernel.org>,
        "Hansen, Dave" <dave.hansen@...el.com>,
        "Christopherson,, Sean" <seanjc@...gle.com>
Subject: Re: [PATCH v5] x86/sgx: Resolves SECS reclaim vs. page fault for EAUG
 race

On Thu, 2023-07-27 at 02:50 +0000, Huang, Kai wrote:
> > An enclave can not run nor generate page faults without a resident SECS
> > page. 
> > 
> 
> I am not sure whether "nor generate page faults without a resident SECS page" is
> accurate?  When SECS is swapped out, I suppose the first EENTER should trigger a
> #PF on the TSC page and in the #PF handler the SECS will be swapped in first.
> 
> I guess you can just remove this sentence?

Hmm.. Probably I should interpret this sentence as the enclave "code" itself
cannot generate page faults without a resident SECS.  This is true.  So feel
free to ignore this comment.