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]) by smtp.lore.kernel.org (Postfix) with ESMTP id E684BCD128A for ; Tue, 9 Apr 2024 23:13:46 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id 744046B009C; Tue, 9 Apr 2024 19:13:46 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 6CD016B009D; Tue, 9 Apr 2024 19:13:46 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 5466F6B009E; Tue, 9 Apr 2024 19:13:46 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from relay.hostedemail.com (smtprelay0011.hostedemail.com [216.40.44.11]) by kanga.kvack.org (Postfix) with ESMTP id 358DE6B009C for ; Tue, 9 Apr 2024 19:13:46 -0400 (EDT) Received: from smtpin20.hostedemail.com (a10.router.float.18 [10.200.18.1]) by unirelay10.hostedemail.com (Postfix) with ESMTP id DA5E2C058B for ; Tue, 9 Apr 2024 23:13:45 +0000 (UTC) X-FDA: 81991547610.20.7CBF360 Received: from dfw.source.kernel.org (dfw.source.kernel.org [139.178.84.217]) by imf07.hostedemail.com (Postfix) with ESMTP id 4CA4340003 for ; Tue, 9 Apr 2024 23:13:44 +0000 (UTC) Authentication-Results: imf07.hostedemail.com; dkim=none; spf=pass (imf07.hostedemail.com: domain of "SRS0=qg+T=LO=goodmis.org=rostedt@kernel.org" designates 139.178.84.217 as permitted sender) smtp.mailfrom="SRS0=qg+T=LO=goodmis.org=rostedt@kernel.org"; dmarc=none ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1712704424; 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:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=hppqcuq+Yoyt7cTNcDqneqcnfe2eVbc+wyM/bm2KjRw=; b=S7ClE3YWMP2ZcIdPAKSitszGvmqJ9QY3BIcgZ4av4oU1wFqRr3TVwvl+t9f9d/Zmnk+V3r 4Tz01sfBvu9x/CVVPtiLIO0c2gjYK4XuMNPXrW3GS5BlfxaAtFHc3Ec1orsY5S+4y+NyWf S1Q4ecR2gTIDt1o3Aecyc+pIQYb4djU= ARC-Authentication-Results: i=1; imf07.hostedemail.com; dkim=none; spf=pass (imf07.hostedemail.com: domain of "SRS0=qg+T=LO=goodmis.org=rostedt@kernel.org" designates 139.178.84.217 as permitted sender) smtp.mailfrom="SRS0=qg+T=LO=goodmis.org=rostedt@kernel.org"; dmarc=none ARC-Seal: i=1; s=arc-20220608; d=hostedemail.com; t=1712704424; a=rsa-sha256; cv=none; b=xvYZSKQV9vrsgqh1Q1Z3YxZMxjMY0IepOfwf3FaldiBEomW/+mhqX5dUA6sRLWStQq3KSS DmFcVcB5wA2uKXcexJa+dW+BnSTtB0r0Z0bif2RsqJgaJKLKSWk2tOBry3/tOt4cE3QYmE jAPuLjEswMMWvIWKIdZjY+G/Y2tMKt4= Received: from smtp.kernel.org (transwarp.subspace.kernel.org [100.75.92.58]) by dfw.source.kernel.org (Postfix) with ESMTP id 801B361A55; Tue, 9 Apr 2024 23:13:43 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 1C44BC433C7; Tue, 9 Apr 2024 23:13:40 +0000 (UTC) Date: Tue, 9 Apr 2024 19:16:15 -0400 From: Steven Rostedt To: "Luck, Tony" Cc: Kees Cook , "linux-kernel@vger.kernel.org" , "linux-trace-kernel@vger.kernel.org" , Masami Hiramatsu , Mark Rutland , Mathieu Desnoyers , Andrew Morton , "Liam R. Howlett" , Vlastimil Babka , Lorenzo Stoakes , "linux-mm@kvack.org" , Thomas Gleixner , Ingo Molnar , Borislav Petkov , Dave Hansen , "x86@kernel.org" , "H. Peter Anvin" , Peter Zijlstra , "Guilherme G. Piccoli" , "linux-hardening@vger.kernel.org" , "Guenter Roeck" , Ross Zwisler , "wklin@google.com" , Vineeth Remanan Pillai , Joel Fernandes , "Suleiman Souhlal" , Linus Torvalds , Catalin Marinas , Will Deacon Subject: Re: [POC][RFC][PATCH 0/2] pstore/mm/x86: Add wildcard memmap to map pstore consistently Message-ID: <20240409191615.3e3b01d3@gandalf.local.home> In-Reply-To: References: <20240409210254.660888920@goodmis.org> <20240409172358.34ea19f0@gandalf.local.home> <202404091519.B7B2221@keescook> X-Mailer: Claws Mail 3.19.1 (GTK+ 2.24.33; x86_64-pc-linux-gnu) MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit X-Rspamd-Queue-Id: 4CA4340003 X-Rspam-User: X-Stat-Signature: jsaas9mxaezryx5pd4mx34osesnpnw3z X-Rspamd-Server: rspam01 X-HE-Tag: 1712704424-260269 X-HE-Meta: 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 5EEYA+2Z VCdZ5/dZ5SMVz5nEp2GmUjXbTUf+gXR7PsECZRXWIaAUA3er64V1vOep70jMteodw6L0Xx9dkbWXTIe/UaPy80DxzR6C7I1dCWqB09N06tHxtPw4RXxboaJc4Kw9VjxrjFtM9cPPbbgOwnZ9NU71A+EWbq0cizFZlfAwwPvbxRe6mTdrQOv/Zp2YfsqnufGYIcHsjGCr+Q2w/E1MuKGu9Bv44pnwMjbUb2NEQfLDskyz/VKIxQA3vZoCnCJ+7CD8ANvQ665lN09n8xhnVpgkmE8fSnihe1yKLuunypucJVpe1GhYOPomp1wcfNFXxxJLcpTXldyYE3i88hqIG+tCa0jY6cA== 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: On Tue, 9 Apr 2024 22:25:33 +0000 "Luck, Tony" wrote: > >> I forgot to mention that this makes it trivial for any machine that doesn't > >> clear memory on soft-reboot, to enable console ramoops (to have access to > >> the last boot dmesg without needing serial). > >> > >> I tested this on a couple of my test boxes and on QEMU, and it works rather > >> well. > > > > I've long wanted a "stable for this machine and kernel" memory region > > like this for pstore. It would make testing much easier. > > Which systems does this work on? I'd assume that servers (and anything > else with ECC memory) would nuke contents while resetting ECC to clean > state. > Well I tested it on a couple of chromebooks, a test box and a laptop (as well as QEMU). I know that ramoops has an ecc option. I'm guessing that would help here (but I'd have to defer to others to answer that). -- Steve