From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail.linutronix.de (146.0.238.70:993) by crypto-ml.lab.linutronix.de with IMAP4-SSL for ; 07 Mar 2019 23:56:21 -0000 Received: from mga09.intel.com ([134.134.136.24]) by Galois.linutronix.de with esmtps (TLS1.2:DHE_RSA_AES_256_CBC_SHA256:256) (Exim 4.80) (envelope-from ) id 1h22s7-0004GE-2D for speck@linutronix.de; Fri, 08 Mar 2019 00:56:20 +0100 Date: Thu, 7 Mar 2019 15:56:14 -0800 From: Andi Kleen Subject: [MODERATED] Re: [patch V6 04/14] MDS basics 4 Message-ID: <20190307235614.GF7535@tassilo.jf.intel.com> References: <20190301214738.281554861@linutronix.de> <20190301214847.524432729@linutronix.de> MIME-Version: 1.0 In-Reply-To: <20190301214847.524432729@linutronix.de> Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit To: speck@linutronix.de List-ID: On Fri, Mar 01, 2019 at 10:47:42PM +0100, speck for Thomas Gleixner wrote: > Subject: [patch V6 04/14] x86/speculation/mds: Add BUG_MSBDS_ONLY > From: Thomas Gleixner > > This bug bit is set on CPUs which are only affected by Microarchitectural > Store Buffer Data Sampling (MSBDS) and not by any other MDS variant. This patch is pointless. It won't have VERW support and we don't have mitigation for Xeon Phi because Linus rejected software sequences. Xeon Phi will simply not be mitigated. However Xeon PHIs are not widely used, and those that are deployed can be handled in different ways. -Andi