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[35.185.214.157]) by smtp.gmail.com with ESMTPSA id p64-20020a622943000000b004fdd5c07d0bsm11630040pfp.63.2022.04.25.08.13.03 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 25 Apr 2022 08:13:03 -0700 (PDT) Date: Mon, 25 Apr 2022 15:13:00 +0000 From: Sean Christopherson To: Oliver Upton Subject: Re: [RFC PATCH 06/17] KVM: arm64: Implement break-before-make sequence for parallel walks Message-ID: References: <20220415215901.1737897-1-oupton@google.com> <20220415215901.1737897-7-oupton@google.com> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <20220415215901.1737897-7-oupton@google.com> Cc: kvm@vger.kernel.org, Marc Zyngier , Peter Shier , Ben Gardon , David Matlack , Paolo Bonzini , kvmarm@lists.cs.columbia.edu, linux-arm-kernel@lists.infradead.org X-BeenThere: kvmarm@lists.cs.columbia.edu X-Mailman-Version: 2.1.14 Precedence: list List-Id: Where KVM/ARM decisions are made List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Errors-To: kvmarm-bounces@lists.cs.columbia.edu Sender: kvmarm-bounces@lists.cs.columbia.edu On Fri, Apr 15, 2022, Oliver Upton wrote: > The ARM architecture requires that software use the 'break-before-make' > sequence whenever memory is being remapped. What does "remapped" mean here? Changing the pfn? Promoting/demoting to/from a huge page? _______________________________________________ kvmarm mailing list kvmarm@lists.cs.columbia.edu https://lists.cs.columbia.edu/mailman/listinfo/kvmarm 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 02AEDC433EF for ; Mon, 25 Apr 2022 15:14:36 +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:In-Reply-To:MIME-Version:References: Message-ID:Subject:Cc: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=hjYrjdUkL5fOHm6lOyxqgnyz/ndQOM/5+VAMCHImb8Q=; b=zznylrraeqa1o1 VBRXJ8gRtcLes2L9DbIoJjvQ1qNnWhUtGv9opEUY3mSrfABiJ/p8VuWAw+JPJ2fQVc0nbtHfTgAdd er4ME6+lpBffQeFyqnsDB39YfieAi+8haL5vQBUr6y4QcZQBML71Kn5uAjlFfgs7fYFn9ck2fu2/Q 0OAa8NFuMYp2wnC1xRlkYj8OfbfIAyRRgDyRGR+OppxnjV73hbTdoAyyJ5KSIfHzJuVLWeFuzE9BI B3DfW4ug1KxPDVm0lgDkOk6o7Zn7TwTyqrm73aVC0w8uG14mWrj8Mb5Aobj9a+mu1DksKARlwoULk DSLmHHczx8J6aUDWe0+A==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.94.2 #2 (Red Hat Linux)) id 1nj0Om-00A3aG-Og; Mon, 25 Apr 2022 15:13:12 +0000 Received: from mail-pj1-x1030.google.com ([2607:f8b0:4864:20::1030]) by bombadil.infradead.org with esmtps (Exim 4.94.2 #2 (Red Hat Linux)) id 1nj0Oj-00A3Z7-9l for linux-arm-kernel@lists.infradead.org; Mon, 25 Apr 2022 15:13:10 +0000 Received: by mail-pj1-x1030.google.com with SMTP id j8-20020a17090a060800b001cd4fb60dccso6188044pjj.2 for ; Mon, 25 Apr 2022 08:13:04 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20210112; h=date:from:to:cc:subject:message-id:references:mime-version :content-disposition:in-reply-to; bh=9K6RsS9yPXS4qwCnQU4PvhBaosajT6TXjveseEixd9Y=; b=Td8+8OcwoY3gMAuGy+Nr7PDBXjeTKxoXi6wOU0bvpucj+ZegyFRrb3nNV04TsgD8WB RSOLS2NTdczLjZ1AveRgpgmHKul+uTROWO9g2KaNG4ZQ/Tsef4I5BA9eGSstyX/lebc1 Xjp4PIm9vk6XpnMvJs0fbh4nF26ppyY+R+HNauGnycg+BDyfkicDyzGEi9n04tJS/Go+ ifSZhxhhIwUFqugC2nYiradOOf3VKGY6aKUxugzPUNvX47TUhTcufsa61KoMLhYPnPOk sGM6dlEaPevIBdzIJShxBddisnmzp79s5CDR38STSlzZyUV59TW3Q8W7gwBd6MsLYRY2 /1Rw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:date:from:to:cc:subject:message-id:references :mime-version:content-disposition:in-reply-to; bh=9K6RsS9yPXS4qwCnQU4PvhBaosajT6TXjveseEixd9Y=; b=BNSBBj6Auuq8bfbRmC2k95mXAelfNYjQdjF66OFVZKLrKLlF8B/QStjHd0rq2F1gTI Q81ZGZiIjHS6jLbAwmDzCZE5CKe/DjlWiqm5logaGxd1rc+LLa0lY5J3VCfykDnrFEmk FwwCUge2NvPF0mLm+ZnOhodDxCn7djEvaIR0H5/ZhH5ywwaQSPGQFDBSW7FyV5blXbcs dHMwZimlskMeUFtwX3ougvWJvkSd6IFJGZUmBGDoKIedC3Y92SZTQqWzvSdUqe2Nq++D RtBBJoRAQJcSqW1Z9F9BSACq0NImh/gD/PI1+2vQKc6A1Dqu+amFrr6hqKEyJVncPqmL 1dEw== X-Gm-Message-State: AOAM533uUljtl/hlWmZAG/JXBgtwFgxsZ0WiXpaLF/xSoX2Fng4qussW SjUaXknA+cCCAQ2cwXAhzmbObg== X-Google-Smtp-Source: ABdhPJwUOlDnUHF5k3woHlV9TQvV9nTL1L7mwNMrpk9JJnQLty3+DM3IyKzJ5rF+Kktvx1yg6+/bZQ== X-Received: by 2002:a17:90b:390b:b0:1d6:b448:b26f with SMTP id ob11-20020a17090b390b00b001d6b448b26fmr21328663pjb.61.1650899583966; Mon, 25 Apr 2022 08:13:03 -0700 (PDT) Received: from google.com (157.214.185.35.bc.googleusercontent.com. [35.185.214.157]) by smtp.gmail.com with ESMTPSA id p64-20020a622943000000b004fdd5c07d0bsm11630040pfp.63.2022.04.25.08.13.03 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 25 Apr 2022 08:13:03 -0700 (PDT) Date: Mon, 25 Apr 2022 15:13:00 +0000 From: Sean Christopherson To: Oliver Upton Cc: kvmarm@lists.cs.columbia.edu, kvm@vger.kernel.org, Marc Zyngier , James Morse , Alexandru Elisei , Suzuki K Poulose , linux-arm-kernel@lists.infradead.org, Peter Shier , Ricardo Koller , Reiji Watanabe , Paolo Bonzini , Ben Gardon , David Matlack Subject: Re: [RFC PATCH 06/17] KVM: arm64: Implement break-before-make sequence for parallel walks Message-ID: References: <20220415215901.1737897-1-oupton@google.com> <20220415215901.1737897-7-oupton@google.com> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <20220415215901.1737897-7-oupton@google.com> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20220425_081309_374886_84A27A92 X-CRM114-Status: UNSURE ( 7.67 ) X-CRM114-Notice: Please train this message. X-BeenThere: linux-arm-kernel@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="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On Fri, Apr 15, 2022, Oliver Upton wrote: > The ARM architecture requires that software use the 'break-before-make' > sequence whenever memory is being remapped. What does "remapped" mean here? Changing the pfn? Promoting/demoting to/from a huge page? _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel 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 vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 20E23C433F5 for ; Mon, 25 Apr 2022 15:13:11 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S242762AbiDYPQN (ORCPT ); Mon, 25 Apr 2022 11:16:13 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:42004 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232572AbiDYPQM (ORCPT ); Mon, 25 Apr 2022 11:16:12 -0400 Received: from mail-pj1-x1033.google.com (mail-pj1-x1033.google.com [IPv6:2607:f8b0:4864:20::1033]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 9F9BA85961 for ; Mon, 25 Apr 2022 08:13:04 -0700 (PDT) Received: by mail-pj1-x1033.google.com with SMTP id u6-20020a17090a1f0600b001d86bd69427so213780pja.5 for ; Mon, 25 Apr 2022 08:13:04 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20210112; h=date:from:to:cc:subject:message-id:references:mime-version :content-disposition:in-reply-to; bh=9K6RsS9yPXS4qwCnQU4PvhBaosajT6TXjveseEixd9Y=; b=Td8+8OcwoY3gMAuGy+Nr7PDBXjeTKxoXi6wOU0bvpucj+ZegyFRrb3nNV04TsgD8WB RSOLS2NTdczLjZ1AveRgpgmHKul+uTROWO9g2KaNG4ZQ/Tsef4I5BA9eGSstyX/lebc1 Xjp4PIm9vk6XpnMvJs0fbh4nF26ppyY+R+HNauGnycg+BDyfkicDyzGEi9n04tJS/Go+ ifSZhxhhIwUFqugC2nYiradOOf3VKGY6aKUxugzPUNvX47TUhTcufsa61KoMLhYPnPOk sGM6dlEaPevIBdzIJShxBddisnmzp79s5CDR38STSlzZyUV59TW3Q8W7gwBd6MsLYRY2 /1Rw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:date:from:to:cc:subject:message-id:references :mime-version:content-disposition:in-reply-to; bh=9K6RsS9yPXS4qwCnQU4PvhBaosajT6TXjveseEixd9Y=; b=hwCe2zEO4ngEJTZReAl9J2oXjGagK+ThjcZVonQL2nvrY39vbSAfConBMgqQqcdA4L GVsUy2wRpMrpX54kUDGraNo4ivO8OqmTbKc/mNGEGC5r+YtrL4k4x14SEVLCiEJiLZsS urw39z3jum+ZYEcr/wnDr58ol4z2Df0Ck7lwY3fKHtKNaizUum0DBVNvlBpNY2bx42Ph dNtjSNl14bDVG085p+YCeuyiFmLfmI+8vCs+c2WQmEPAmca9/p9KDD22D06KbpzA/GfI LpOBqi16Boi4iLGJZFEM/v2CnGatof0aklYCg3YNqZWR434B8QLaOPbIuKfk8205VgJk XwWg== X-Gm-Message-State: AOAM533ZcmkqmeOgA/ONib79igkUA5BUUlC2Jd8DboKNxARDNmoQTfMS dedSXoMJdfSqfpnuSxne/Uth1g== X-Google-Smtp-Source: ABdhPJwUOlDnUHF5k3woHlV9TQvV9nTL1L7mwNMrpk9JJnQLty3+DM3IyKzJ5rF+Kktvx1yg6+/bZQ== X-Received: by 2002:a17:90b:390b:b0:1d6:b448:b26f with SMTP id ob11-20020a17090b390b00b001d6b448b26fmr21328663pjb.61.1650899583966; Mon, 25 Apr 2022 08:13:03 -0700 (PDT) Received: from google.com (157.214.185.35.bc.googleusercontent.com. [35.185.214.157]) by smtp.gmail.com with ESMTPSA id p64-20020a622943000000b004fdd5c07d0bsm11630040pfp.63.2022.04.25.08.13.03 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 25 Apr 2022 08:13:03 -0700 (PDT) Date: Mon, 25 Apr 2022 15:13:00 +0000 From: Sean Christopherson To: Oliver Upton Cc: kvmarm@lists.cs.columbia.edu, kvm@vger.kernel.org, Marc Zyngier , James Morse , Alexandru Elisei , Suzuki K Poulose , linux-arm-kernel@lists.infradead.org, Peter Shier , Ricardo Koller , Reiji Watanabe , Paolo Bonzini , Ben Gardon , David Matlack Subject: Re: [RFC PATCH 06/17] KVM: arm64: Implement break-before-make sequence for parallel walks Message-ID: References: <20220415215901.1737897-1-oupton@google.com> <20220415215901.1737897-7-oupton@google.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20220415215901.1737897-7-oupton@google.com> Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org On Fri, Apr 15, 2022, Oliver Upton wrote: > The ARM architecture requires that software use the 'break-before-make' > sequence whenever memory is being remapped. What does "remapped" mean here? Changing the pfn? Promoting/demoting to/from a huge page?