linux-kernel - Re: [PATCH 1/4] x86/sgx: Add sgx_nr_all

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 for Android: free password hash cracker in your pocket

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

Message-ID: <b8a31e6e-90e8-f93f-e6b2-e72801fb31e4@intel.com>
Date:   Tue, 6 Jul 2021 07:56:40 -0700
From:   Dave Hansen <dave.hansen@...el.com>
To:     Jarkko Sakkinen <jarkko@...nel.org>, Shuah Khan <shuah@...nel.org>
Cc:     linux-kselftest@...r.kernel.org, linux-sgx@...r.kernel.org,
        Reinette Chatre <reinette.chatre@...el.com>,
        Borislav Petkov <bp@...en8.de>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, x86@...nel.org,
        "H. Peter Anvin" <hpa@...or.com>, Jonathan Corbet <corbet@....net>,
        linux-kernel@...r.kernel.org, linux-doc@...r.kernel.org
Subject: Re: [PATCH 1/4] x86/sgx: Add sgx_nr_all_pages to the debugfs

On 7/5/21 7:36 AM, Jarkko Sakkinen wrote:
> Create /sys/kernel/debug/x86/sgx_nr_all_pages, which reports total
> number of EPC pages available in the system.
Could we flesh this out a bit, please?

What's the value here when userspace could just re-enumerate the EPC
size from CPUID?

I'd really appreciate if we could draw parallels between these additions
to the "SGX VM" and their analogs in the "core VM".  In this case, I
think the closest analog is probably "MemTotal" in /proc/meminfo.

Second, how is this going to be used?

Third, is this going to be the ABI forever?