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 bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id BA832CF34B2 for ; Wed, 19 Nov 2025 14:32:20 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender: Content-Transfer-Encoding:Content-Type:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:Subject:References:In-Reply-To: Message-Id:Cc:To:From:Date:MIME-Version:Reply-To:Content-ID: Content-Description:Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc :Resent-Message-ID:List-Owner; bh=1HS8hzRENISW2zi/lDLEqKYr7LNozrxqGCJprKoIaBg=; b=vMFO5aNrkRnZVktXgGFTHMa6DN 6Oz9ciOhqU0+SIXOBdv5JVz3+hpS7dBZSCak6jVbVff0kooCQv5UBw4tIUcWZApvkWCJik8tJSA9+ aTa/j2qlmKYbpPfJyiMs/eX409BDdpzNCebWsEAKCiZ5pOQcPItHlxb46z+3QZ07ArWJwiTNMJ6AU lmaXm1tGGDuOMOC97fh5+N0dUvvFHalB5nSa/95XtcZ4WUnJlpj9+1G73X6J2S9AgeFVAqW6+9BRR hDFCUsmuhxYaeBiPl4xJu6D3Y4/HEibvQdw0TO+bZ+ImEaWl0NmALM2cuDnOr6bGjhNc940fbQo0+ MgObKjuw==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.98.2 #2 (Red Hat Linux)) id 1vLjDx-00000003NfT-0xzF; Wed, 19 Nov 2025 14:31:57 +0000 Received: from tor.source.kernel.org ([2600:3c04:e001:324:0:1991:8:25]) by bombadil.infradead.org with esmtps (Exim 4.98.2 #2 (Red Hat Linux)) id 1vLjDw-00000003NfA-0MOO for linux-riscv@lists.infradead.org; Wed, 19 Nov 2025 14:31:56 +0000 Received: from smtp.kernel.org (transwarp.subspace.kernel.org [100.75.92.58]) by tor.source.kernel.org (Postfix) with ESMTP id E80C26016B; Wed, 19 Nov 2025 14:31:54 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id E4EC7C2BCB1; Wed, 19 Nov 2025 14:31:52 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1763562714; bh=t7JHEvub1bQJal+g6fm+oWNxS6WRDvkPwGmxdErav44=; h=Date:From:To:Cc:In-Reply-To:References:Subject:From; b=Ea4bojU3b4uuNYkYVwnmXHYKrqlrEyIaRN7/uuLqQ0tjPkP+0CBl8L7OWP74jMhkR 6BEZWebMdOXDsVMaFdTA/3c4Ol/FfmWfZJ7I77nIstjY/8MxmX60jwnojnAv9c5OB6 yiaxqYjeyx5Rbc+bcCTpfw9nnAVkEBGMQ7n8TQ68Sdv8V0/fXWca/2aZJ+PdDOCe1Z fgqUw43kE8xbSlEr9OaiWF6IUiQPM10iJQo0m7vG74uwaC7eKHKSOTyPWFK+IxX8Cr NCsa459K8S2l9VNSLvncI+/+4fDDtvhtPnwSSP5VIBtd53subUnkzEeGp3uNl9yo2f QaAOeHd7myqGw== Received: from phl-compute-01.internal (phl-compute-01.internal [10.202.2.41]) by mailfauth.phl.internal (Postfix) with ESMTP id 560CFF4008D; Wed, 19 Nov 2025 09:31:51 -0500 (EST) Received: from phl-imap-02 ([10.202.2.81]) by phl-compute-01.internal (MEProxy); Wed, 19 Nov 2025 09:31:51 -0500 X-ME-Sender: X-ME-Proxy-Cause: gggruggvucftvghtrhhoucdtuddrgeeffedrtdeggddvvdeggeehucetufdoteggodetrf dotffvucfrrhhofhhilhgvmecuhfgrshhtofgrihhlpdfurfetoffkrfgpnffqhgenuceu rghilhhouhhtmecufedttdenucesvcftvggtihhpihgvnhhtshculddquddttddmnecujf gurhepofggfffhvfevkfgjfhfutgfgsehtqhertdertdejnecuhfhrohhmpedftehnugih ucfnuhhtohhmihhrshhkihdfuceolhhuthhosehkvghrnhgvlhdrohhrgheqnecuggftrf grthhtvghrnhepjeejvddvtdehffdtgfejjeefgefgjeeggfeuteeiuedvtefgfffhvdej iefguedtnecuvehluhhsthgvrhfuihiivgeptdenucfrrghrrghmpehmrghilhhfrhhomh eprghnugihodhmvghsmhhtphgruhhthhhpvghrshhonhgrlhhithihqdduudeiudekheei fedvqddvieefudeiiedtkedqlhhuthhopeepkhgvrhhnvghlrdhorhhgsehlihhnuhigrd hluhhtohdruhhspdhnsggprhgtphhtthhopeegkedpmhhouggvpehsmhhtphhouhhtpdhr tghpthhtohepjhgsrghrohhnsegrkhgrmhgrihdrtghomhdprhgtphhtthhopegsphesrg hlihgvnhekrdguvgdprhgtphhtthhopegrrhhnugesrghrnhgusgdruggvpdhrtghpthht ohepuggrvhgvmhesuggrvhgvmhhlohhfthdrnhgvthdprhgtphhtthhopehmrghthhhivg hurdguvghsnhhohigvrhhssegvfhhfihgtihhoshdrtghomhdprhgtphhtthhopegsohhq uhhnrdhfvghnghesghhmrghilhdrtghomhdprhgtphhtthhopehurhgviihkihesghhmrg hilhdrtghomhdprhgtphhtthhopehrohhsthgvughtsehgohhoughmihhsrdhorhhgpdhr tghpthhtohepjhgrnhhnhhesghhoohhglhgvrdgtohhm X-ME-Proxy: Feedback-ID: ieff94742:Fastmail Received: by mailuser.phl.internal (Postfix, from userid 501) id 1FAFE700054; Wed, 19 Nov 2025 09:31:51 -0500 (EST) X-Mailer: MessagingEngine.com Webmail Interface MIME-Version: 1.0 X-ThreadId: A2ZwPDH9FoLc Date: Wed, 19 Nov 2025 06:31:30 -0800 From: "Andy Lutomirski" To: "Valentin Schneider" , "Linux Kernel Mailing List" , linux-mm@kvack.org, rcu@vger.kernel.org, "the arch/x86 maintainers" , linux-arm-kernel@lists.infradead.org, loongarch@lists.linux.dev, linux-riscv@lists.infradead.org, linux-arch@vger.kernel.org, linux-trace-kernel@vger.kernel.org Cc: "Thomas Gleixner" , "Ingo Molnar" , "Borislav Petkov" , "Dave Hansen" , "H. Peter Anvin" , "Peter Zijlstra (Intel)" , "Arnaldo Carvalho de Melo" , "Josh Poimboeuf" , "Paolo Bonzini" , "Arnd Bergmann" , "Frederic Weisbecker" , "Paul E. McKenney" , "Jason Baron" , "Steven Rostedt" , "Ard Biesheuvel" , "Sami Tolvanen" , "David S. Miller" , "Neeraj Upadhyay" , "Joel Fernandes" , "Josh Triplett" , "Boqun Feng" , "Uladzislau Rezki" , "Mathieu Desnoyers" , "Mel Gorman" , "Andrew Morton" , "Masahiro Yamada" , "Han Shen" , "Rik van Riel" , "Jann Horn" , "Dan Carpenter" , "Oleg Nesterov" , "Juri Lelli" , "Clark Williams" , "Yair Podemsky" , "Marcelo Tosatti" , "Daniel Wagner" , "Petr Tesarik" , "Shrikanth Hegde" Message-Id: <65ae9404-5d7d-42a3-969e-7e2ceb56c433@app.fastmail.com> In-Reply-To: <20251114151428.1064524-9-vschneid@redhat.com> References: <20251114150133.1056710-1-vschneid@redhat.com> <20251114151428.1064524-9-vschneid@redhat.com> Subject: Re: [RFC PATCH v7 29/31] x86/mm/pti: Implement a TLB flush immediately after a switch to kernel CR3 X-BeenThere: linux-riscv@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 Sender: "linux-riscv" Errors-To: linux-riscv-bounces+linux-riscv=archiver.kernel.org@lists.infradead.org CgpPbiBGcmksIE5vdiAxNCwgMjAyNSwgYXQgNzoxNCBBTSwgVmFsZW50aW4gU2NobmVpZGVyIHdy b3RlOgo+IERlZmVycmluZyBrZXJuZWwgcmFuZ2UgVExCIGZsdXNoZXMgcmVxdWlyZXMgdGhlIGd1 YXJhbnRlZSB0aGF0IHVwb24KPiBlbnRlcmluZyB0aGUga2VybmVsLCBubyBzdGFsZSBlbnRyeSBt YXkgYmUgYWNjZXNzZWQuIFRoZSBzaW1wbGVzdCB3YXkgdG8KPiBwcm92aWRlIHN1Y2ggYSBndWFy YW50ZWUgaXMgdG8gaXNzdWUgYW4gdW5jb25kaXRpb25hbCBmbHVzaCB1cG9uIHN3aXRjaGluZwo+ IHRvIHRoZSBrZXJuZWwgQ1IzLCBhcyB0aGlzIGlzIHRoZSBwaXZvdGluZyBwb2ludCB3aGVyZSBz dWNoIHN0YWxlIGVudHJpZXMKPiBtYXkgYmUgYWNjZXNzZWQuCj4KCkRvaW5nIHRoaXMgdG9nZXRo ZXIgd2l0aCB0aGUgUFRJIENSMyBzd2l0Y2ggaGFzIG5vIGFjdHVhbCBiZW5lZml0OiBNT1YgQ1Iz IGRvZXNu4oCZdCBmbHVzaCBnbG9iYWwgcGFnZXMuIEFuZCBkb2luZyB0aGlzIGluIGFzbSBpcyBw cmV0dHkgZ3Jvc3MuICBXZSBkb27igJl0IGV2ZW4gZ2V0IGEgZnJlZSBzeW5jX2NvcmUoKSBvdXQg b2YgaXQgYmVjYXVzZSBJTlZQQ0lEIGlzIG5vdCBkb2N1bWVudGVkIGFzIGJlaW5nIHNlcmlhbGl6 aW5nLgoKV2h5IGNhbuKAmXQgd2UgZG8gaXQgaW4gQz8gIFdoYXTigJlzIHRoZSBhY3R1YWwgcmlz az8gIEluIG9yZGVyIHRvIHRyaXAgb3ZlciBhIHN0YWxlIFRMQiBlbnRyeSwgd2Ugd291bGQgbmVl ZCB0byBkZWZlcmVuY2UgYSBwb2ludGVyIHRvIG5ld2x5IGFsbG9jYXRlZCBrZXJuZWwgdmlydHVh bCBtZW1vcnkgdGhhdCB3YXMgbm90IHZhbGlkIHByaW9yIHRvIG91ciBlbnRyeSBpbnRvIHVzZXIg bW9kZS4gSSBjYW4gaW1hZ2luZSBCUEYgZG9pbmcgdGhpcywgYnV0IHBsYWluIG5vaW5zdHIgQyBp biB0aGUgZW50cnkgcGF0aD8gIEVzcGVjaWFsbHkgbm9pbnN0ciBDICp0aGF0IGhhcyBSQ1UgZGlz YWJsZWQqPyAgV2UgYWxyZWFkeSBjYW7igJl0IGZvbGxvdyBhbiBSQ1UgcG9pbnRlciwgYW5kIElT VE0gdGhlIG9ubHkgc3R5bGUgb2Yga2VybmVsIGNvZGUgdGhhdCBtaWdodCBkbyB0aGlzIHdvdWxk IHVzZSBSQ1UgdG8gcHJvdGVjdCB0aGUgcG9pbnRlciwgYW5kIHdlIGFyZSBhbHJlYWR5IGRvb21l ZCBpZiB3ZSBmb2xsb3cgYW4gUkNVIHBvaW50ZXIgdG8gYW55IHNvcnQgb2YgbWVtb3J5LgoKV2Ug ZG8gbmVlZCB0byB3YXRjaCBvdXQgZm9yIE5NSS9NQ0UgaGl0dGluZyBiZWZvcmUgd2UgZmx1c2gu CgpfX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fXwpsaW51eC1y aXNjdiBtYWlsaW5nIGxpc3QKbGludXgtcmlzY3ZAbGlzdHMuaW5mcmFkZWFkLm9yZwpodHRwOi8v bGlzdHMuaW5mcmFkZWFkLm9yZy9tYWlsbWFuL2xpc3RpbmZvL2xpbnV4LXJpc2N2Cg==