From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mx1.redhat.com ([209.132.183.28]) by Galois.linutronix.de with esmtps (TLS1.2:DHE_RSA_AES_256_CBC_SHA256:256) (Exim 4.80) (envelope-from ) id 1fLr18-0000GX-Re for speck@linutronix.de; Thu, 24 May 2018 16:14:59 +0200 Received: from smtp.corp.redhat.com (int-mx01.intmail.prod.int.phx2.redhat.com [10.5.11.11]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id 4270D314517F for ; Thu, 24 May 2018 14:14:52 +0000 (UTC) Received: from washington.bos.jonmasters.org (ovpn-124-147.rdu2.redhat.com [10.10.124.147]) by smtp.corp.redhat.com (Postfix) with ESMTPS id E9DAE6F940 for ; Thu, 24 May 2018 14:14:51 +0000 (UTC) Subject: [MODERATED] Re: L1D-Fault KVM mitigation References: <20180424090630.wlghmrpasn7v7wbn@suse.de> <20180424093537.GC4064@hirez.programming.kicks-ass.net> <1524563292.8691.38.camel@infradead.org> <20180424110445.GU4043@hirez.programming.kicks-ass.net> <1527068745.8186.89.camel@infradead.org> <20180524094526.GE12198@hirez.programming.kicks-ass.net> From: Jon Masters Message-ID: <62005c95-d5dd-4042-3963-5074868f181a@redhat.com> Date: Thu, 24 May 2018 10:14:45 -0400 MIME-Version: 1.0 In-Reply-To: <20180524094526.GE12198@hirez.programming.kicks-ass.net> Content-Type: multipart/mixed; boundary="uh8WAmfgFTZCbXD0C1LfXuinx081ztovE"; protected-headers="v1" To: speck@linutronix.de List-ID: This is an OpenPGP/MIME encrypted message (RFC 4880 and 3156) --uh8WAmfgFTZCbXD0C1LfXuinx081ztovE Content-Type: text/plain; charset=windows-1252 Content-Language: en-US Content-Transfer-Encoding: quoted-printable On 05/24/2018 05:45 AM, speck for Peter Zijlstra wrote: > On Wed, May 23, 2018 at 10:45:45AM +0100, speck for David Woodhouse wro= te: >> The microcode trick just makes it a lot easier because we don't >> have to *explicitly* pause the sibling vCPUs and manage their state on= >> every vmexit/entry. And avoids potential race conditions with managing= >> that in software. >=20 > Yes, it would certainly help and avoid a fair bit of ugly. We specifically requested this microcode change a few months ago and were told that it isn't possible to implement across the fleet. If that changes/changed, then great, wonderful, we're all for it. Jon. --=20 Computer Architect | Sent from my Fedora powered laptop --uh8WAmfgFTZCbXD0C1LfXuinx081ztovE--