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[209.132.180.67]) by mx.google.com with ESMTP id n70-v6si11285650pfa.320.2018.08.20.16.16.21; Mon, 20 Aug 2018 16:16:37 -0700 (PDT) Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67; Authentication-Results: mx.google.com; dkim=fail header.i=@infradead.org header.s=twosheds.20170209 header.b=msvZ2CpT; spf=pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726760AbeHUCcu (ORCPT + 99 others); Mon, 20 Aug 2018 22:32:50 -0400 Received: from twosheds.infradead.org ([90.155.92.209]:51368 "EHLO twosheds.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726590AbeHUCct (ORCPT ); Mon, 20 Aug 2018 22:32:49 -0400 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=twosheds.20170209; h=Mime-Version:Date:Content-Type: References:In-Reply-To:Cc:To:From:Subject:Message-ID:Sender:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Id: List-Help:List-Unsubscribe:List-Subscribe:List-Post:List-Owner:List-Archive; bh=M4zedEMlK/6/brcSlpWHFh8JRtLTjZ6IKi9gvbit0J0=; b=msvZ2CpT+larI26ZFUIWCpMHp iw4c1bRvOdGiSTGnTz0sZVBRgxACIVdlyr/0bg1F6pArq4l6IR0x+D118jp0ar4gMMRsD6oTq/08C Mhdb5baQ7tGu6YAa+vF4/wTrFiNFjFNzIsms1JsAXMKX9lkKg6nkj6pdEwJYJjoe/v0kbijb1QHms 5kWMWPJCMEsVeupduAQlVeStFaXZVoBvb5z4kRa9x5KSHyx/QvlSdMRSXmQhLSyRgunNS9a4OIYSC BHH9p1pKP+xjgtXn3aoDYEEoJXsul5Di0BPpfdqlFxun3MN5Q/drkSS2aRhEvHro1il9iLvqb044/ xjxFrqttg==; Received: from [2001:8b0:10b:1::2fb] by twosheds.infradead.org with esmtpsa (Exim 4.90_1 #2 (Red Hat Linux)) id 1frtNg-004xNw-Dy; Mon, 20 Aug 2018 23:14:40 +0000 Message-ID: <1534806880.10027.29.camel@infradead.org> Subject: Re: Redoing eXclusive Page Frame Ownership (XPFO) with isolated CPUs in mind (for KVM to isolate its guests per CPU) From: David Woodhouse To: Dave Hansen , Tycho Andersen , Linus Torvalds Cc: Konrad Rzeszutek Wilk , juerg.haefliger@hpe.com, deepa.srinivasan@oracle.com, Jim Mattson , Andrew Cooper , Linux Kernel Mailing List , Boris Ostrovsky , linux-mm , Thomas Gleixner , joao.m.martins@oracle.com, pradeep.vincent@oracle.com, Andi Kleen , Khalid Aziz , kanth.ghatraju@oracle.com, Liran Alon , Kees Cook , jsteckli@os.inf.tu-dresden.de, Kernel Hardening , chris.hyser@oracle.com, Tyler Hicks , John Haxby , Jon Masters In-Reply-To: References: <20180820212556.GC2230@char.us.oracle.com> <1534801939.10027.24.camel@amazon.co.uk> <20180820223557.GC16961@cisco.cisco.com> Face: 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 Content-Type: multipart/signed; micalg="sha-256"; protocol="application/x-pkcs7-signature"; boundary="=-MvqfPKZJBmXetkrwqYn9" Date: Tue, 21 Aug 2018 00:14:40 +0100 Mime-Version: 1.0 X-Mailer: Evolution 3.18.5.2-0ubuntu3.2 X-SRS-Rewrite: SMTP reverse-path rewritten from by twosheds.infradead.org. See http://www.infradead.org/rpr.html Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org --=-MvqfPKZJBmXetkrwqYn9 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Mon, 2018-08-20 at 15:59 -0700, Dave Hansen wrote: > On 08/20/2018 03:35 PM, Tycho Andersen wrote: > > Since meltdown hit, I haven't worked seriously on understand and > > implementing his suggestions, in part because it wasn't clear to me > > what pieces of the infrastructure we might be able to re-use. Someone > > who knows more about mm/ might be able to suggest an approach, though >=20 > Unfortunately, I'm not sure there's much of KPTI we can reuse.=C2=A0 KPTI > still has a very static kernel map (well, two static kernel maps) and > XPFO really needs a much more dynamic map. >=20 > We do have a bit of infrastructure now to do TLB flushes near the kernel > exit point, but it's entirely for the user address space, which isn't > affected by XPFO. One option is to have separate kernel address spaces, both with and without the full physmap. If you need the physmap, then rather than manually mapping with 4KiB pages, you just switch. Having first ensured that no malicious guest or userspace is running on a sibling, of course. 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