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[34.168.104.7]) by smtp.gmail.com with ESMTPSA id f5-20020a655505000000b00434760ee36asm7850505pgr.16.2022.11.09.14.42.14 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 09 Nov 2022 14:42:14 -0800 (PST) Date: Wed, 9 Nov 2022 22:42:10 +0000 From: Sean Christopherson To: Ben Gardon Cc: Oliver Upton , Marc Zyngier , James Morse , Alexandru Elisei , linux-arm-kernel@lists.infradead.org, kvmarm@lists.cs.columbia.edu, kvm@vger.kernel.org, Reiji Watanabe , Ricardo Koller , David Matlack , Quentin Perret , Gavin Shan , Peter Xu , Will Deacon , kvmarm@lists.linux.dev Subject: Re: [PATCH v5 09/14] KVM: arm64: Atomically update stage 2 leaf attributes in parallel walks Message-ID: References: <20221107215644.1895162-1-oliver.upton@linux.dev> <20221107215644.1895162-10-oliver.upton@linux.dev> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org On Wed, Nov 09, 2022, Ben Gardon wrote: > On Mon, Nov 7, 2022 at 1:58 PM Oliver Upton wrote: > > @@ -1054,7 +1066,7 @@ kvm_pte_t kvm_pgtable_stage2_mkold(struct kvm_pgtable *pgt, u64 addr) > > bool kvm_pgtable_stage2_is_young(struct kvm_pgtable *pgt, u64 addr) > > { > > kvm_pte_t pte = 0; > > - stage2_update_leaf_attrs(pgt, addr, 1, 0, 0, &pte, NULL); > > + stage2_update_leaf_attrs(pgt, addr, 1, 0, 0, &pte, NULL, 0); > > Would be nice to have an enum for KVM_PGTABLE_WALK_EXCLUSIVE so this > doesn't just have to pass 0. That's also dangerous though since the param is a set of flags, not unique, arbitrary values. E.g. this won't do the expected thing if (flags & KVM_PGTABLE_WALK_EXCLUSIVE) I assume compilers would complain, but never say never when it comes to compilers :-) 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 mm01.cs.columbia.edu (mm01.cs.columbia.edu [128.59.11.253]) by smtp.lore.kernel.org (Postfix) with ESMTP id 91220C4332F for ; Wed, 9 Nov 2022 22:42:20 +0000 (UTC) Received: from localhost (localhost [127.0.0.1]) by mm01.cs.columbia.edu (Postfix) with ESMTP id 12F6F4BA2F; Wed, 9 Nov 2022 17:42:20 -0500 (EST) X-Virus-Scanned: at lists.cs.columbia.edu Authentication-Results: mm01.cs.columbia.edu (amavisd-new); dkim=softfail (fail, message has been altered) header.i=@google.com Received: from mm01.cs.columbia.edu ([127.0.0.1]) by localhost (mm01.cs.columbia.edu [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id nip6f7zG49N5; Wed, 9 Nov 2022 17:42:18 -0500 (EST) Received: from mm01.cs.columbia.edu (localhost [127.0.0.1]) by mm01.cs.columbia.edu (Postfix) with ESMTP id AD4734BA25; Wed, 9 Nov 2022 17:42:18 -0500 (EST) Received: from localhost (localhost [127.0.0.1]) by mm01.cs.columbia.edu (Postfix) with ESMTP id 364E84BA23 for ; Wed, 9 Nov 2022 17:42:17 -0500 (EST) X-Virus-Scanned: at lists.cs.columbia.edu Received: from mm01.cs.columbia.edu ([127.0.0.1]) by localhost (mm01.cs.columbia.edu [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id vCMyusFdzxVo for ; Wed, 9 Nov 2022 17:42:16 -0500 (EST) Received: from mail-pj1-f46.google.com (mail-pj1-f46.google.com [209.85.216.46]) by mm01.cs.columbia.edu (Postfix) with ESMTPS id 14E474BA07 for ; Wed, 9 Nov 2022 17:42:16 -0500 (EST) Received: by mail-pj1-f46.google.com with SMTP id q1-20020a17090a750100b002139ec1e999so104705pjk.1 for ; Wed, 09 Nov 2022 14:42:15 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20210112; h=in-reply-to:content-disposition:mime-version:references:message-id :subject:cc:to:from:date:from:to:cc:subject:date:message-id:reply-to; bh=ZKiMsUeXYzlgxWfF0WcmHUUjbEiQdWPsUbhG4FuUTvU=; b=cD4gLgROz4g4LtmSRbdLXGAjaJuR6pnQPfjazM0yU0Hn/lv/WT5o4Her5FZZKbaJvo 3llk8DYE2nZDW2sbqQRiQfbjE1ZapQwwU0U2Cv08c9Ebk8FU0i0XK4awq7K7iidJf8OH 3GcfjHTDxs/DR50LOoQvFL4LWTUNBDsk4dxtwc4SeMTKq2oVpauMgfCUNtsr3uNWy3cz RpG+CtA8bVTi2doo034FUCj8Kt6OAO4pYKClaQOLsbg15mz+DJmaYa7LRAgZji6biWZu +q6Wz7oH6l72tqHN4GUlfyDALVakTWYywy2upo+HFDthGSfQgKq+AvRIE4mmZZ0GudzA bgyg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=in-reply-to:content-disposition:mime-version:references:message-id :subject:cc:to:from:date:x-gm-message-state:from:to:cc:subject:date :message-id:reply-to; bh=ZKiMsUeXYzlgxWfF0WcmHUUjbEiQdWPsUbhG4FuUTvU=; b=XVjEw5eVFS+O/HrQGphWQOrbR3lwtT32W5AL7uS2JEXNFPwDwsP0byfyzG0pZmDH3B d85zwT2OGzF+O+dtt5ekjGYd+O4dAO+ji07B8rd11SwlyI1d9kqrePiHB91O/6ScchGP +1V6KX3OgMCWlnScQRIDQohAENQ4QhTT/L602d5ZBQSFJzu9+ljSJZ89qZSeTBSRRfUi Y66hWyN9FRs56XMT7WcHjFYuWHQHIAiurDWOL+cywAFZ63+Doga05flOpWWXlI7ElqfK ZWkXyETE4Rp4xwtyEOsvoM/1joxO7rFeAL9HTaixiDcb1saJ/XSqQVssH3P1yd1t7kxt p3zg== X-Gm-Message-State: ACrzQf00G/0lJu1RKCpfhGWsAMX4Ol3X8aVuy0yRSJjox2IVIhcUL61X apNFfSjs++Dw5LrO9boeDmpBBQ== X-Google-Smtp-Source: AMsMyM7VhBvIBJZq8DOffvWOeCdh5Qe5jEL63Uu0jploe/nMqN4VkZSgtUrZB0hVopNblvbQ13kL9w== X-Received: by 2002:a17:902:e811:b0:186:8a61:ea76 with SMTP id u17-20020a170902e81100b001868a61ea76mr63663058plg.10.1668033734747; Wed, 09 Nov 2022 14:42:14 -0800 (PST) Received: from google.com (7.104.168.34.bc.googleusercontent.com. [34.168.104.7]) by smtp.gmail.com with ESMTPSA id f5-20020a655505000000b00434760ee36asm7850505pgr.16.2022.11.09.14.42.14 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 09 Nov 2022 14:42:14 -0800 (PST) Date: Wed, 9 Nov 2022 22:42:10 +0000 From: Sean Christopherson To: Ben Gardon Subject: Re: [PATCH v5 09/14] KVM: arm64: Atomically update stage 2 leaf attributes in parallel walks Message-ID: References: <20221107215644.1895162-1-oliver.upton@linux.dev> <20221107215644.1895162-10-oliver.upton@linux.dev> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: Cc: kvm@vger.kernel.org, Marc Zyngier , Will Deacon , kvmarm@lists.linux.dev, David Matlack , 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 Wed, Nov 09, 2022, Ben Gardon wrote: > On Mon, Nov 7, 2022 at 1:58 PM Oliver Upton wrote: > > @@ -1054,7 +1066,7 @@ kvm_pte_t kvm_pgtable_stage2_mkold(struct kvm_pgtable *pgt, u64 addr) > > bool kvm_pgtable_stage2_is_young(struct kvm_pgtable *pgt, u64 addr) > > { > > kvm_pte_t pte = 0; > > - stage2_update_leaf_attrs(pgt, addr, 1, 0, 0, &pte, NULL); > > + stage2_update_leaf_attrs(pgt, addr, 1, 0, 0, &pte, NULL, 0); > > Would be nice to have an enum for KVM_PGTABLE_WALK_EXCLUSIVE so this > doesn't just have to pass 0. That's also dangerous though since the param is a set of flags, not unique, arbitrary values. E.g. this won't do the expected thing if (flags & KVM_PGTABLE_WALK_EXCLUSIVE) I assume compilers would complain, but never say never when it comes to compilers :-) _______________________________________________ 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 35C48C433FE for ; Wed, 9 Nov 2022 22:43:21 +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=hNI9x+8fcZeb88lwClBFDjW3HW83F88aQTdPcFezhvA=; b=G8A7Vy3mDm6mP7 k+uCAFbuIb0/dz8X7pliVnlLdNTUd9pZ0cWkJ2DZExWby/pRouKOHb2OoCL7tOdvDLlLYBIlJUVFw 91KWda4WKOsHwvfmFL2SOMWiZm90CMVAbmL3E1Qrg9MYZwE8t25ngq9aj5ukWx9AaZcygt5jLcYCA jHDhZi4dpPYELsLxTouNsVrFcV46GcWQppM/bXgNdzErnS/sWqPhwztWTvlk1L9mxg9NoBVXVY0+E Sjc0n5zRBbMLAf3jbN/RH8iCymAV5ynmYpxNvIv3nqd+ZeL8Q1R1Yc5GgfNigOx2KtQciDVd9gmNK 8fp01/g/sMY5NOP2S3XA==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.94.2 #2 (Red Hat Linux)) id 1ostm0-000L1j-Uv; Wed, 09 Nov 2022 22:42:21 +0000 Received: from mail-pj1-x102d.google.com ([2607:f8b0:4864:20::102d]) by bombadil.infradead.org with esmtps (Exim 4.94.2 #2 (Red Hat Linux)) id 1ostlx-000Kxx-My for linux-arm-kernel@lists.infradead.org; Wed, 09 Nov 2022 22:42:19 +0000 Received: by mail-pj1-x102d.google.com with SMTP id d13-20020a17090a3b0d00b00213519dfe4aso101364pjc.2 for ; Wed, 09 Nov 2022 14:42:15 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20210112; h=in-reply-to:content-disposition:mime-version:references:message-id :subject:cc:to:from:date:from:to:cc:subject:date:message-id:reply-to; bh=ZKiMsUeXYzlgxWfF0WcmHUUjbEiQdWPsUbhG4FuUTvU=; b=cD4gLgROz4g4LtmSRbdLXGAjaJuR6pnQPfjazM0yU0Hn/lv/WT5o4Her5FZZKbaJvo 3llk8DYE2nZDW2sbqQRiQfbjE1ZapQwwU0U2Cv08c9Ebk8FU0i0XK4awq7K7iidJf8OH 3GcfjHTDxs/DR50LOoQvFL4LWTUNBDsk4dxtwc4SeMTKq2oVpauMgfCUNtsr3uNWy3cz RpG+CtA8bVTi2doo034FUCj8Kt6OAO4pYKClaQOLsbg15mz+DJmaYa7LRAgZji6biWZu +q6Wz7oH6l72tqHN4GUlfyDALVakTWYywy2upo+HFDthGSfQgKq+AvRIE4mmZZ0GudzA bgyg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=in-reply-to:content-disposition:mime-version:references:message-id :subject:cc:to:from:date:x-gm-message-state:from:to:cc:subject:date :message-id:reply-to; bh=ZKiMsUeXYzlgxWfF0WcmHUUjbEiQdWPsUbhG4FuUTvU=; b=gg4bXu1P5kgqOuiRqM9OESUQbEJHs35AiEOmsY8bPvD7h4GyGRmqCmxRdF/fGRQsbA kP8d2/y1iQlkxnKURmvqqyTZh00XGsh88iiEQzcazgsW/UQ9c0NukOQu6f/+rCDlyrS+ q7zU44cQjHMEFvBd7QakTC0l4GB8LyKPUv//QqkSUI0g4hJecuIjGdaZO9Ytr7zP7WEA 6+zl9HgoUJWQO42qq5ndABhnMfSfQ2Nmtv31gL5JCs6lrkNF4zuBH/UpOEAaw1M7l6iB TGTENkwbbo4v/8oU2P23ZeR/2imSEQb96XnzCrOcKRxv6UuFrYRPied3OrRQ9NdnWIUZ u+OQ== X-Gm-Message-State: ACrzQf1/n2Uk4AeYX1vvJEWQUzmbew+I0fBTI8eRg4EjuXDEZEFiKqMm MswRGAnP2NPh2ZqcE8vMKQW3fw== X-Google-Smtp-Source: AMsMyM7VhBvIBJZq8DOffvWOeCdh5Qe5jEL63Uu0jploe/nMqN4VkZSgtUrZB0hVopNblvbQ13kL9w== X-Received: by 2002:a17:902:e811:b0:186:8a61:ea76 with SMTP id u17-20020a170902e81100b001868a61ea76mr63663058plg.10.1668033734747; Wed, 09 Nov 2022 14:42:14 -0800 (PST) Received: from google.com (7.104.168.34.bc.googleusercontent.com. [34.168.104.7]) by smtp.gmail.com with ESMTPSA id f5-20020a655505000000b00434760ee36asm7850505pgr.16.2022.11.09.14.42.14 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 09 Nov 2022 14:42:14 -0800 (PST) Date: Wed, 9 Nov 2022 22:42:10 +0000 From: Sean Christopherson To: Ben Gardon Cc: Oliver Upton , Marc Zyngier , James Morse , Alexandru Elisei , linux-arm-kernel@lists.infradead.org, kvmarm@lists.cs.columbia.edu, kvm@vger.kernel.org, Reiji Watanabe , Ricardo Koller , David Matlack , Quentin Perret , Gavin Shan , Peter Xu , Will Deacon , kvmarm@lists.linux.dev Subject: Re: [PATCH v5 09/14] KVM: arm64: Atomically update stage 2 leaf attributes in parallel walks Message-ID: References: <20221107215644.1895162-1-oliver.upton@linux.dev> <20221107215644.1895162-10-oliver.upton@linux.dev> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20221109_144217_779671_18B0216B X-CRM114-Status: GOOD ( 12.10 ) 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 Wed, Nov 09, 2022, Ben Gardon wrote: > On Mon, Nov 7, 2022 at 1:58 PM Oliver Upton wrote: > > @@ -1054,7 +1066,7 @@ kvm_pte_t kvm_pgtable_stage2_mkold(struct kvm_pgtable *pgt, u64 addr) > > bool kvm_pgtable_stage2_is_young(struct kvm_pgtable *pgt, u64 addr) > > { > > kvm_pte_t pte = 0; > > - stage2_update_leaf_attrs(pgt, addr, 1, 0, 0, &pte, NULL); > > + stage2_update_leaf_attrs(pgt, addr, 1, 0, 0, &pte, NULL, 0); > > Would be nice to have an enum for KVM_PGTABLE_WALK_EXCLUSIVE so this > doesn't just have to pass 0. That's also dangerous though since the param is a set of flags, not unique, arbitrary values. E.g. this won't do the expected thing if (flags & KVM_PGTABLE_WALK_EXCLUSIVE) I assume compilers would complain, but never say never when it comes to compilers :-) _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel