linux-kernel - RE: [PATCH v2] x86/cpu: Use SERIALIZE in sync

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Message-ID: <908fa12f40804f2185f58e8d2a87413f@intel.com>
Date:   Wed, 5 Aug 2020 22:19:53 +0000
From:   "Luck, Tony" <tony.luck@...el.com>
To:     Andy Lutomirski <luto@...capital.net>,
        Ricardo Neri <ricardo.neri-calderon@...ux.intel.com>
CC:     Andy Lutomirski <luto@...nel.org>, Borislav Petkov <bp@...en8.de>,
        "H. Peter Anvin" <hpa@...or.com>, Borislav Petkov <bp@...e.de>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...nel.org>, X86 ML <x86@...nel.org>,
        "Peter Zijlstra (Intel)" <peterz@...radead.org>,
        "Hansen, Dave" <dave.hansen@...el.com>,
        "Zhang, Cathy" <cathy.zhang@...el.com>,
        "Yu, Fenghua" <fenghua.yu@...el.com>,
        "Park, Kyung Min" <kyung.min.park@...el.com>,
        "Shankar, Ravi V" <ravi.v.shankar@...el.com>,
        "Christopherson, Sean J" <sean.j.christopherson@...el.com>,
        LKML <linux-kernel@...r.kernel.org>,
        "Neri, Ricardo" <ricardo.neri@...el.com>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        linux-edac <linux-edac@...r.kernel.org>
Subject: RE: [PATCH v2] x86/cpu: Use SERIALIZE in sync_core() when available

> I meant asm as in a .S file. But the code we have is fine for this purpose, at least for now.

There seem to be some drivers that call sync_core:

drivers/misc/sgi-gru/grufault.c:                sync_core();
drivers/misc/sgi-gru/grufault.c:                sync_core();            /* make sure we are have current data */
drivers/misc/sgi-gru/gruhandles.c:      sync_core();
drivers/misc/sgi-gru/gruhandles.c:      sync_core();
drivers/misc/sgi-gru/grukservices.c:    sync_core();

So if you go this path some day be sure to EXPORT the iret_to_self() function.

-Tony