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 X-Spam-Level: X-Spam-Status: No, score=-2.5 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED, USER_AGENT_SANE_1 autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 6A22BC43331 for ; Fri, 27 Mar 2020 18:09:24 +0000 (UTC) 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 mail.kernel.org (Postfix) with ESMTPS id 405352072F for ; Fri, 27 Mar 2020 18:09:24 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=lists.infradead.org header.i=@lists.infradead.org header.b="q7MEB+k9"; dkim=fail reason="signature verification failed" (1024-bit key) header.d=kernel.org header.i=@kernel.org header.b="wQOLuOxy" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 405352072F Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=kernel.org Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20170209; h=Sender: Content-Transfer-Encoding:Content-Type:Cc:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:In-Reply-To:MIME-Version:References: Message-ID:Subject:To:From:Date:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=snCetNuqJcpK/MubfkBT3H4LLvGJePDIY0K/iGrPq4c=; b=q7MEB+k9R5Jh27 NJUj+MT/rS2VZqcP8DCBHir/+0tyomFnTCwhDhQc9O2SzXSfzuSH/9s9GmDRUE3eykDOCkKjeISRF OwrV3PaGahdTfg8f2AqnCKbgzbe1fWxq8rsJ788SI4bnARLSF5jrJnpUr/Z6azqdd2cswcQ3Wjb3c uKMJK+LB+V3GUpvdfrbSpzHrM5r/kObpcp/PMk9BB6MkP2GluGngEEk+Vh0Z8x6SP2/lfD1QmewPA QToBzHqnKL+yAmJyShKqeRsx+TXjHOsqGU+EtBK3srdElzTdwm+cdX6n4UG6gFflADRW/Qm5jXHei 3dC4tEYcJhibwbEqBpLA==; Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.92.3 #3 (Red Hat Linux)) id 1jHtQ3-0008Ht-7x; Fri, 27 Mar 2020 18:09:23 +0000 Received: from mail.kernel.org ([198.145.29.99]) by bombadil.infradead.org with esmtps (Exim 4.92.3 #3 (Red Hat Linux)) id 1jHtQ0-0008HI-DY for linux-arm-kernel@lists.infradead.org; Fri, 27 Mar 2020 18:09:21 +0000 Received: from willie-the-truck (236.31.169.217.in-addr.arpa [217.169.31.236]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 035BD2071B; Fri, 27 Mar 2020 18:09:17 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1585332560; bh=zhwEDwgqijCCf3Yv/ZISrfo5qqO4vWvdB2ey3n6lsEk=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=wQOLuOxy5Ad8+KKPsUNDjk0Gb6uM/3sfbIfZrQKmvj3s2f90PnU1B81WnGKSNn45f AL4udLBPyCJWoDLrZGzdKVOK0TPQ0wGbBOGtZu3r2VRdMwVekHRFY4YJF5YVnB10gN oaZDTLzOvvN+uR4uRET0a/blE6hsiw0ROVR6dF8o= Date: Fri, 27 Mar 2020 18:09:14 +0000 From: Will Deacon To: Marc Zyngier Subject: Re: [RFC PATCH] arm64: unify WORKAROUND_SPECULATIVE_AT_{NVHE,VHE} Message-ID: <20200327180913.GA10454@willie-the-truck> References: <20200327143941.195626-1-ascull@google.com> <1705907b-234c-6f56-1360-f598c8047d1d@arm.com> <20200327174838.GD178422@google.com> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.10.1 (2018-07-13) X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20200327_110920_485240_9B7DEA79 X-CRM114-Status: GOOD ( 12.27 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: qwandor@google.com, qperret@google.com, Suzuki Poulose , tabba@google.com, Steven Price , wedsonaf@google.com, Andrew Scull , James Morse , dbrazdil@google.com, kernel-team@android.com, kvmarm@lists.cs.columbia.edu, linux-arm-kernel@lists.infradead.org Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org On Fri, Mar 27, 2020 at 05:52:59PM +0000, Marc Zyngier wrote: > On 2020-03-27 17:48, Andrew Scull wrote: > > Thanks, Steven. Could we look into the EPD* caching microarch details > > Marc was referring to for these A55 and A76 cores? > > Only the folks that have access to the RTL can tell you, unfortunately. > > Thankfully, there is a bunch of people on Cc that should be able to ping > the relevant teams and report back... Yup, otherwise I guess we can throw in the TLB invalidation after setting the EPDx bits until we have clarity from Arm. We wouldn't need to broadcast it, so it might not be too bad on performance. If it is, I suppose we could switch to a reserved VMID? Will _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel