From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail.linutronix.de (193.142.43.55:993) by crypto-ml.lab.linutronix.de with IMAP4-SSL for ; 22 Oct 2019 21:46:45 -0000 Received: from mx2.suse.de ([195.135.220.15] helo=mx1.suse.de) by Galois.linutronix.de with esmtps (TLS1.2:DHE_RSA_AES_256_CBC_SHA256:256) (Exim 4.80) (envelope-from ) id 1iN1zI-0007g2-2q for speck@linutronix.de; Tue, 22 Oct 2019 23:46:44 +0200 Received: from relay2.suse.de (unknown [195.135.220.254]) by mx1.suse.de (Postfix) with ESMTP id 230E6AD78 for ; Tue, 22 Oct 2019 21:46:37 +0000 (UTC) Date: Tue, 22 Oct 2019 23:46:29 +0200 From: Borislav Petkov Subject: [MODERATED] Re: [PATCH v7 04/10] TAAv7 4 Message-ID: <20191022214628.GX31458@zn.tnic> References: <20191022165112.GK31458@zn.tnic> <20191022170230.GM31458@zn.tnic> <20191022180032.GF29216@guptapadev.amr> <20191022181215.GP31458@zn.tnic> <20191022191614.GA26396@agluck-desk2.amr.corp.intel.com> <20191022192820.GU31458@zn.tnic> <20191022200235.GA26744@agluck-desk2.amr.corp.intel.com> <20191022205427.GW31458@zn.tnic> <20191022213820.njr46drwwinzp7hu@treble> MIME-Version: 1.0 In-Reply-To: <20191022213820.njr46drwwinzp7hu@treble> Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable To: speck@linutronix.de List-ID: On Tue, Oct 22, 2019 at 04:38:20PM -0500, speck for Josh Poimboeuf wrote: > I'm not sure what you mean, I think the patches mitigate TAA by default > when TSX is on (ignoring SMT of course). >=20 > Also, suspending disbelief for a moment and assuming TSX becomes a huge > success story and you want to safely enable it 5 years down the road, > you'd have to do >=20 > tsx=3Don,tsx_async_abort=3Dfull,nosmt,tsx_bug2=3Dfull,nosmt .... etc >=20 > when you just want to turn the darned thing on without having to worry > about specifying all the mitigations for all currently known bugs. But when you want to enable it 5 years from now, you simply do tsx=3Don Why would you even need to supply anything after it? --=20 Regards/Gruss, Boris. SUSE Software Solutions Germany GmbH, GF: Felix Imend=C3=B6rffer, HRB 36809, = AG N=C3=BCrnberg --=20