linux-kernel - RE: [RH72 Spectre] ibpb_enabled = 1 leads to hard LOCKUP under x86

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Message-ID: <0575AF4FD06DD142AD198903C74E1CC87A5EC9AE@ORSMSX103.amr.corp.intel.com>
Date:   Sat, 20 Jan 2018 13:56:08 +0000
From:   "Van De Ven, Arjan" <arjan.van.de.ven@...el.com>
To:     David Woodhouse <dwmw2@...radead.org>,
        Hou Tao <houtao1@...wei.com>,
        "aarcange@...hat.com" <aarcange@...hat.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
CC:     "mingo@...hat.com" <mingo@...hat.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        "ak@...ux.intel.com" <ak@...ux.intel.com>,
        "dave.hansen@...ux.intel.com" <dave.hansen@...ux.intel.com>,
        "peterz@...radead.org" <peterz@...radead.org>,
        "qiuxishi@...wei.com" <qiuxishi@...wei.com>,
        "wangkefeng.wang@...wei.com" <wangkefeng.wang@...wei.com>
Subject: RE: [RH72 Spectre] ibpb_enabled = 1 leads to hard LOCKUP under
 x86_64 host machine

well first of all don't use IBRS, use retpoline

and if Andrea says this was a known issue in their code then I think that closes the issue.




> -----Original Message-----
> From: David Woodhouse [mailto:dwmw2@...radead.org]
> Sent: Saturday, January 20, 2018 1:03 AM
> To: Hou Tao <houtao1@...wei.com>; aarcange@...hat.com; linux-
> kernel@...r.kernel.org; Van De Ven, Arjan <arjan.van.de.ven@...el.com>
> Cc: mingo@...hat.com; Thomas Gleixner <tglx@...utronix.de>;
> ak@...ux.intel.com; dave.hansen@...ux.intel.com; peterz@...radead.org;
> qiuxishi@...wei.com; wangkefeng.wang@...wei.com
> Subject: Re: [RH72 Spectre] ibpb_enabled = 1 leads to hard LOCKUP under
> x86_64 host machine
> 
> On Sat, 2018-01-20 at 17:00 +0800, Hou Tao wrote:
> >
> > So has anyone encountered a similar problem before, and any suggestions
> > and directions for the hard LOCKUP problems ?
> 
> Arjan, what is the Intel recommendation here?