From mboxrd@z Thu Jan 1 00:00:00 1970 Return-path: Received: from mail-pg0-x244.google.com ([2607:f8b0:400e:c05::244]) by Galois.linutronix.de with esmtps (TLS1.2:RSA_AES_128_CBC_SHA1:128) (Exim 4.80) (envelope-from ) id 1fAfq1-0006nN-Tc for speck@linutronix.de; Mon, 23 Apr 2018 20:05:18 +0200 Received: by mail-pg0-x244.google.com with SMTP id i6so8919154pgv.3 for ; Mon, 23 Apr 2018 11:05:17 -0700 (PDT) Received: from i7.lan (c-73-11-52-149.hsd1.or.comcast.net. [73.11.52.149]) by smtp.gmail.com with ESMTPSA id h1sm23498944pgf.93.2018.04.23.11.05.09 for (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Mon, 23 Apr 2018 11:05:10 -0700 (PDT) Sender: Linus Torvalds Date: Mon, 23 Apr 2018 11:05:07 -0700 (PDT) From: Linus Torvalds Subject: [MODERATED] Re: [patch 07/11] [PATCH v2 07/10] Linux Patch #7 In-Reply-To: <20180423175151.GA21779@dhcp-10-159-147-220.vpn.oracle.com> Message-ID: References: <20180421223538.GF18575@pd.tnic> <45c96d89-f75b-9770-6032-ca87115a0e0a@redhat.com> <0de04dd1-0f35-dc0e-d27a-dec03ed0f138@redhat.com> <20180422093545.GA32218@pd.tnic> <2c7fa188-cd84-1a10-56cb-358d3f859559@redhat.com> <20180422103456.GC32218@pd.tnic> <3d7880e7-6b67-b35a-a090-2854f7db54ff@redhat.com> <2184fc1b-dcbc-a40c-64da-4965c7c48faa@redhat.com> <20180423175151.GA21779@dhcp-10-159-147-220.vpn.oracle.com> MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII To: speck@linutronix.de List-ID: On Mon, 23 Apr 2018, speck for Konrad Rzeszutek Wilk wrote: > > I believe (and Linus, please correct me here) that the question of > toggling on/off SPEC_CTRL MSR on user-space entrance is a no-go. Absolutely. That would be entirely crazy. Is there a known situation where that would actually make sense? Linus