linux-kernel - Re: [PATCH v5 2/7] x86/sgx: Add infrastructure to identify SGX EPC pages

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <3d6b0136-dcaa-e0c0-a830-68a012222b19@intel.com>
Date:   Tue, 21 Sep 2021 16:50:42 -0700
From:   Dave Hansen <dave.hansen@...el.com>
To:     "Luck, Tony" <tony.luck@...el.com>
Cc:     Sean Christopherson <seanjc@...gle.com>,
        Jarkko Sakkinen <jarkko@...nel.org>,
        Matthew Wilcox <willy@...radead.org>,
        "Zhang, Cathy" <cathy.zhang@...el.com>,
        "linux-sgx@...r.kernel.org" <linux-sgx@...r.kernel.org>,
        "x86@...nel.org" <x86@...nel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v5 2/7] x86/sgx: Add infrastructure to identify SGX EPC
 pages

On 9/21/21 4:48 PM, Luck, Tony wrote:
> 
> # name            <active_objs> <num_objs> <objsize> <objperslab> <pagesperslab> : tunables <limit> <batchcount> <sharedfactor> : slabdata <active_slabs> <num_slabs> <sharedavail>
> 
> So I think this means that I have (9950 - 9800) * 584 = 87600 more bytes
> allocated. Maybe that's a lot? But percentage-wise is seems in the
> noise. E.g. We allocate one "struct sgx_epc_page" for each SGX page.
> On my system I have 4GB of SGX EPC, so around 32 MB of these structures.

100k for 4GB of EPC is certainly in the noise as far as I'm concerned.

Thanks for checking this.