From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 626F0CCF9E0 for ; Fri, 24 Oct 2025 15:17:28 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id C37C98E00B6; Fri, 24 Oct 2025 11:17:27 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id BE8728E0042; Fri, 24 Oct 2025 11:17:27 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id AB03C8E00B6; Fri, 24 Oct 2025 11:17:27 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from relay.hostedemail.com (smtprelay0010.hostedemail.com [216.40.44.10]) by kanga.kvack.org (Postfix) with ESMTP id 949B58E0042 for ; Fri, 24 Oct 2025 11:17:27 -0400 (EDT) Received: from smtpin08.hostedemail.com (a10.router.float.18 [10.200.18.1]) by unirelay01.hostedemail.com (Postfix) with ESMTP id 59BA349991 for ; Fri, 24 Oct 2025 15:17:27 +0000 (UTC) X-FDA: 84033361734.08.A2EFF43 Received: from casper.infradead.org (casper.infradead.org [90.155.50.34]) by imf18.hostedemail.com (Postfix) with ESMTP id 959401C000B for ; Fri, 24 Oct 2025 15:17:25 +0000 (UTC) Authentication-Results: imf18.hostedemail.com; dkim=pass header.d=infradead.org header.s=casper.20170209 header.b=gDnU6DHI ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1761319045; h=from:from:sender:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc:cc:mime-version:mime-version: content-type:content-type:content-transfer-encoding: in-reply-to:in-reply-to:references:references:dkim-signature; bh=vX6q5KsWvP/pqF1uXTr61P+nn+J2TSZ+8mTaeYcEPG8=; b=siKzhHNd17sLEK9utn80gcJfoQ3ssBzJmz63/7PLJGGI8qXUhy3Mnmz6HqN3Yn3OmaFzFU KMlCjt4LZ7gBkjD+czhAQiISHoMDQnMFOjf3qGV2SQBMLm2iY4cN7G/hM/vYyI/9x05aHC ifFIL8wucE4WUTViwCh1PUjR4Zka1eY= ARC-Authentication-Results: i=1; imf18.hostedemail.com; dkim=pass header.d=infradead.org header.s=casper.20170209 header.b=gDnU6DHI; spf=none (imf18.hostedemail.com: domain of BATV+b7f0eb53100f8146c054+8097+infradead.org+dwmw2@casper.srs.infradead.org has no SPF policy when checking 90.155.50.34) smtp.mailfrom=BATV+b7f0eb53100f8146c054+8097+infradead.org+dwmw2@casper.srs.infradead.org; dmarc=none ARC-Seal: i=1; s=arc-20220608; d=hostedemail.com; t=1761319045; a=rsa-sha256; cv=none; b=x9t/6LL8QpfaXSscuxm43RZkRzARKYj7dIU6W8oPuES8RBUtfnil54PwAqTCovHC5vt6ZF 4Cy5IOAdoCgFnVGVLTr0GM4l1c92I0RQzPBISpskIqYA0u6j1TCpzOzmo0fctG5o9xaytn eMb12t2NsRmCZ4KFmLhQYY0098/Ezc4= DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=casper.20170209; h=MIME-Version:Content-Type:References: In-Reply-To:Date:Cc:To:From:Subject:Message-ID:Sender:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description; bh=vX6q5KsWvP/pqF1uXTr61P+nn+J2TSZ+8mTaeYcEPG8=; b=gDnU6DHIdceHt5TWtp/21TLKxG bT1wzsEr2z4OfNLbuXGb/Ro4AFnwD3sE52NY83fR9ieUwW3++4Vbdlivr6tKMTxJKEgK7vSXaTk/6 FlOq0rg9uKxjcP2m0YoALKLYtt7MFUra347J67q3tsKaT18UHNM7bhlTlLmjdwroHsrgFzJJjHoaB /bztisngf7nkDl05L64bo+nRvlesqYJqVBBJXJZsouTKNEOgZtZcUbdDTudf5IGr2MfNpyJQcDk5n q4XHcqmpyDW/6JkaGWr9As1wex7kvmTF8YJfbtqj4IH8ksKLDblU1JkzzsVECbtAxPBhbGRvC5pB2 WJLEMgqw==; Received: from [2001:8b0:10b:5:d8ad:45c0:47cf:4bed] (helo=u09cd745991455d.ant.amazon.com) by casper.infradead.org with esmtpsa (Exim 4.98.2 #2 (Red Hat Linux)) id 1vCJXb-00000003dWb-3ylw; Fri, 24 Oct 2025 15:17:21 +0000 Message-ID: <7324616a8d2631aa8132f725f9f6551e3e6b21dd.camel@infradead.org> Subject: Re: [PATCH v3 11/13] x86/xen: use lazy_mmu_state when context-switching From: David Woodhouse To: Kevin Brodsky , David Hildenbrand , linux-mm@kvack.org Cc: linux-kernel@vger.kernel.org, Alexander Gordeev , Andreas Larsson , Andrew Morton , Boris Ostrovsky , Borislav Petkov , Catalin Marinas , Christophe Leroy , Dave Hansen , "David S. Miller" , "H. Peter Anvin" , Ingo Molnar , Jann Horn , Juergen Gross , "Liam R. Howlett" , Lorenzo Stoakes , Madhavan Srinivasan , Michael Ellerman , Michal Hocko , Mike Rapoport , Nicholas Piggin , Peter Zijlstra , Ryan Roberts , Suren Baghdasaryan , Thomas Gleixner , Vlastimil Babka , Will Deacon , Yeoreum Yun , linux-arm-kernel@lists.infradead.org, linuxppc-dev@lists.ozlabs.org, sparclinux@vger.kernel.org, xen-devel@lists.xenproject.org, x86@kernel.org Date: Fri, 24 Oct 2025 16:17:20 +0100 In-Reply-To: <6ed9f404-9939-4e9f-b5aa-4253bef46df1@arm.com> References: <20251015082727.2395128-1-kevin.brodsky@arm.com> <20251015082727.2395128-12-kevin.brodsky@arm.com> <348e5f1c5a90e4ab0f14b4d997baf7169745bf04.camel@infradead.org> <6ed9f404-9939-4e9f-b5aa-4253bef46df1@arm.com> Content-Type: multipart/signed; micalg="sha-256"; protocol="application/pkcs7-signature"; boundary="=-YI9KzXTKaCZlBvC3KOA8" User-Agent: Evolution 3.52.3-0ubuntu1 MIME-Version: 1.0 X-SRS-Rewrite: SMTP reverse-path rewritten from by casper.infradead.org. See http://www.infradead.org/rpr.html X-Rspamd-Queue-Id: 959401C000B X-Rspamd-Server: rspam11 X-Rspam-User: X-Stat-Signature: gwpy7g4xjkfgkhigy9xpc4xpffn8hie1 X-HE-Tag: 1761319045-516917 X-HE-Meta: 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 iiVT3xy5 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 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: --=-YI9KzXTKaCZlBvC3KOA8 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Fri, 2025-10-24 at 17:05 +0200, Kevin Brodsky wrote: > On 24/10/2025 16:47, David Woodhouse wrote: > > On Thu, 2025-10-23 at 22:06 +0200, David Hildenbrand wrote: > > > On 15.10.25 10:27, Kevin Brodsky wrote: > > > > We currently set a TIF flag when scheduling out a task that is in > > > > lazy MMU mode, in order to restore it when the task is scheduled > > > > again. > > > >=20 > > > > The generic lazy_mmu layer now tracks whether a task is in lazy MMU > > > > mode in task_struct::lazy_mmu_state. We can therefore check that > > > > state when switching to the new task, instead of using a separate > > > > TIF flag. > > > >=20 > > > > Signed-off-by: Kevin Brodsky > > > > --- > > >=20 > > > Looks ok to me, but I hope we get some confirmation from x86 / xen > > > folks. > >=20 > > I know tglx has shouted at me in the past for precisely this reminder, > > but you know you can test Xen guests under QEMU/KVM now and don't need > > to actually run Xen? Has this been boot tested? >=20 > I considered boot-testing a Xen guest (considering the Xen-specific > changes in this series), but having no idea how to go about it I quickly > gave up... Happy to follow instructions :) https://qemu-project.gitlab.io/qemu/system/i386/xen.html covers booting Xen HVM guests, and near the bottom PV guests too (for which you do need a copy of Xen to run in QEMU with '--kernel xen', and your distro's build should suffice for that). Let me know if you have any trouble. Here's a sample command line which works here... qemu-system-x86_64 -display none --accel kvm,xen-version=3D0x40011,kernel-i= rqchip=3Dsplit -drive file=3D/var/lib/libvirt/images/fedora28.qcow2,if=3Dxe= n -kernel ~/git/linux-2.6/arch/x86/boot/bzImage -append "root=3D/dev/xvda1 = console=3DttyS0" -serial mon:stdio --=-YI9KzXTKaCZlBvC3KOA8 Content-Type: application/pkcs7-signature; name="smime.p7s" Content-Disposition: attachment; filename="smime.p7s" Content-Transfer-Encoding: base64 MIAGCSqGSIb3DQEHAqCAMIACAQExDzANBglghkgBZQMEAgEFADCABgkqhkiG9w0BBwEAAKCCD9Aw ggSOMIIDdqADAgECAhAOmiw0ECVD4cWj5DqVrT9PMA0GCSqGSIb3DQEBCwUAMGUxCzAJBgNVBAYT AlVTMRUwEwYDVQQKEwxEaWdpQ2VydCBJbmMxGTAXBgNVBAsTEHd3dy5kaWdpY2VydC5jb20xJDAi BgNVBAMTG0RpZ2lDZXJ0IEFzc3VyZWQgSUQgUm9vdCBDQTAeFw0yNDAxMzAwMDAwMDBaFw0zMTEx MDkyMzU5NTlaMEExCzAJBgNVBAYTAkFVMRAwDgYDVQQKEwdWZXJva2V5MSAwHgYDVQQDExdWZXJv a2V5IFNlY3VyZSBFbWFpbCBHMjCCASIwDQYJKoZIhvcNAQEBBQADggEPADCCAQoCggEBAMjvgLKj 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