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 629CDC4332F for ; Fri, 11 Nov 2022 15:47:46 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S234025AbiKKPrp (ORCPT ); Fri, 11 Nov 2022 10:47:45 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:59136 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233981AbiKKPrn (ORCPT ); Fri, 11 Nov 2022 10:47:43 -0500 Received: from ams.source.kernel.org (ams.source.kernel.org [IPv6:2604:1380:4601:e00::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 9AA4F532ED for ; Fri, 11 Nov 2022 07:47:42 -0800 (PST) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ams.source.kernel.org (Postfix) with ESMTPS id 57736B82650 for ; Fri, 11 Nov 2022 15:47:41 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id D6017C433C1; Fri, 11 Nov 2022 15:47:39 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1668181659; bh=ieiibTmDrFYVTnTf2P9P+mwebXpKPMN4HIQwkxrTT54=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=BDJqlCSoXKUc2tIHGpdf46XyjiJUb0FugqmunaImzUbYD+eF7V80k+OHqrcLpwITP y3d6rGZJdZDq0ike5/4kPHFA2iw6BiUdAiH7QkUxMJuVU1D7FWIPqlArkNn5SwKUOl 6ad6sW/OPY5SIePylKYuf+AS1QJnYhSnCKERBbmYmdVqu3gsIHVbMDB5Hl5H9J+HCI zb6+GQFdTSI2CWyIfh5M7lMh6MbYiWk5KSvFgydPEIkKe0lrP6j/wlZ12uMMVGm+4F HUtuRX8P6dTMgCuyqiJC7ngDqNT/Y1Axp4tWFazvj2Vvu8mHpyUKYqiA+HOtZpi2fC uo/bAX3FlljSA== Received: from sofa.misterjones.org ([185.219.108.64] helo=valley-girl.lan) by disco-boy.misterjones.org with esmtpsa (TLS1.3) tls TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 (Exim 4.95) (envelope-from ) id 1otWFl-005Shi-Fz; Fri, 11 Nov 2022 15:47:37 +0000 From: Marc Zyngier To: James Morse , Oliver Upton , Alexandru Elisei Cc: Quentin Perret , Peter Xu , kvm@vger.kernel.org, kvmarm@lists.cs.columbia.edu, Will Deacon , kvmarm@lists.linux.dev, Ben Gardon , Ricardo Koller , linux-arm-kernel@lists.infradead.org, Sean Christopherson , Reiji Watanabe , Gavin Shan , David Matlack Subject: Re: [PATCH v5 00/14] KVM: arm64: Parallel stage-2 fault handling Date: Fri, 11 Nov 2022 15:47:34 +0000 Message-Id: <166818113574.3365943.966631047504377265.b4-ty@kernel.org> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20221107215644.1895162-1-oliver.upton@linux.dev> References: <20221107215644.1895162-1-oliver.upton@linux.dev> MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 8bit X-SA-Exim-Connect-IP: 185.219.108.64 X-SA-Exim-Rcpt-To: james.morse@arm.com, oliver.upton@linux.dev, alexandru.elisei@arm.com, qperret@google.com, peterx@redhat.com, kvm@vger.kernel.org, kvmarm@lists.cs.columbia.edu, will@kernel.org, kvmarm@lists.linux.dev, bgardon@google.com, ricarkol@google.com, linux-arm-kernel@lists.infradead.org, seanjc@google.com, reijiw@google.com, gshan@redhat.com, dmatlack@google.com X-SA-Exim-Mail-From: maz@kernel.org X-SA-Exim-Scanned: No (on disco-boy.misterjones.org); SAEximRunCond expanded to false Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org On Mon, 7 Nov 2022 21:56:30 +0000, Oliver Upton wrote: > Presently KVM only takes a read lock for stage 2 faults if it believes > the fault can be fixed by relaxing permissions on a PTE (write unprotect > for dirty logging). Otherwise, stage 2 faults grab the write lock, which > predictably can pile up all the vCPUs in a sufficiently large VM. > > Like the TDP MMU for x86, this series loosens the locking around > manipulations of the stage 2 page tables to allow parallel faults. RCU > and atomics are exploited to safely build/destroy the stage 2 page > tables in light of multiple software observers. > > [...] I've gone over this for quite a while, and while I'm still sh*t scared about it, I've decided to let it simmer in -next for a bit. If anything goes wrong or that someone spots something ugly, it will be easy to simply drop the branch. For simple fixes, they can go on top. [01/14] KVM: arm64: Combine visitor arguments into a context structure commit: dfc7a7769ab7f2a2f629c673717ef1fa7b63aa42 [02/14] KVM: arm64: Stash observed pte value in visitor context commit: 83844a2317ecad935f6735abd854e4bf3f757040 [03/14] KVM: arm64: Pass mm_ops through the visitor context commit: 2a611c7f87f26cca405da63a57f06d0e4dc14240 [04/14] KVM: arm64: Don't pass kvm_pgtable through kvm_pgtable_walk_data commit: fa002e8e79b3f980455ba585c1f47b26680de5b9 [05/14] KVM: arm64: Add a helper to tear down unlinked stage-2 subtrees commit: 8e94e1252cc054bb31fd3e9a15235cd831970ec1 [06/14] KVM: arm64: Use an opaque type for pteps commit: 6b91b8f95cadd3441c056182daf9024475ac4a91 [07/14] KVM: arm64: Tear down unlinked stage-2 subtree after break-before-make commit: 5c359cca1faf6d7671537fe1c240e8668467864d [08/14] KVM: arm64: Protect stage-2 traversal with RCU commit: c3119ae45dfb6038ca458ab5ba7a9fba2810845b [09/14] KVM: arm64: Atomically update stage 2 leaf attributes in parallel walks commit: ca5de2448c3b4c018fe3d6223df8b59068be1cd7 [10/14] KVM: arm64: Split init and set for table PTE commit: 331aa3a0547d1c794587e0df374d13b16645e832 [11/14] KVM: arm64: Make block->table PTE changes parallel-aware commit: 0ab12f3574db6cb432917a667f9392a88e8f0dfc [12/14] KVM: arm64: Make leaf->leaf PTE changes parallel-aware commit: 946fbfdf336b811479e024136c7cabc00157b6b9 [13/14] KVM: arm64: Make table->block changes parallel-aware commit: af87fc03cfdf6893011df419588d27acdfb9c197 [14/14] KVM: arm64: Handle stage-2 faults in parallel commit: 1577cb5823cefdff4416f272a88143ee933d97f5 Fingers crossed, M. -- Without deviation from the norm, progress is not possible. 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 E0B48C43217 for ; Fri, 11 Nov 2022 15:47:46 +0000 (UTC) Received: from localhost (localhost [127.0.0.1]) by mm01.cs.columbia.edu (Postfix) with ESMTP id 44F444B91E; Fri, 11 Nov 2022 10:47:46 -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=@kernel.org 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 PTn-hmDpnNoG; Fri, 11 Nov 2022 10:47:45 -0500 (EST) Received: from mm01.cs.columbia.edu (localhost [127.0.0.1]) by mm01.cs.columbia.edu (Postfix) with ESMTP id EFC074B921; Fri, 11 Nov 2022 10:47:44 -0500 (EST) Received: from localhost (localhost [127.0.0.1]) by mm01.cs.columbia.edu (Postfix) with ESMTP id 4F52D4B921 for ; Fri, 11 Nov 2022 10:47:43 -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 5tfBshGcw3ls for ; Fri, 11 Nov 2022 10:47:42 -0500 (EST) Received: from dfw.source.kernel.org (dfw.source.kernel.org [139.178.84.217]) by mm01.cs.columbia.edu (Postfix) with ESMTPS id 07F044B91E for ; Fri, 11 Nov 2022 10:47:41 -0500 (EST) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by dfw.source.kernel.org (Postfix) with ESMTPS id 8427D62023; Fri, 11 Nov 2022 15:47:40 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id D6017C433C1; Fri, 11 Nov 2022 15:47:39 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1668181659; bh=ieiibTmDrFYVTnTf2P9P+mwebXpKPMN4HIQwkxrTT54=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=BDJqlCSoXKUc2tIHGpdf46XyjiJUb0FugqmunaImzUbYD+eF7V80k+OHqrcLpwITP y3d6rGZJdZDq0ike5/4kPHFA2iw6BiUdAiH7QkUxMJuVU1D7FWIPqlArkNn5SwKUOl 6ad6sW/OPY5SIePylKYuf+AS1QJnYhSnCKERBbmYmdVqu3gsIHVbMDB5Hl5H9J+HCI zb6+GQFdTSI2CWyIfh5M7lMh6MbYiWk5KSvFgydPEIkKe0lrP6j/wlZ12uMMVGm+4F HUtuRX8P6dTMgCuyqiJC7ngDqNT/Y1Axp4tWFazvj2Vvu8mHpyUKYqiA+HOtZpi2fC uo/bAX3FlljSA== Received: from sofa.misterjones.org ([185.219.108.64] helo=valley-girl.lan) by disco-boy.misterjones.org with esmtpsa (TLS1.3) tls TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 (Exim 4.95) (envelope-from ) id 1otWFl-005Shi-Fz; Fri, 11 Nov 2022 15:47:37 +0000 From: Marc Zyngier To: James Morse , Oliver Upton , Alexandru Elisei Subject: Re: [PATCH v5 00/14] KVM: arm64: Parallel stage-2 fault handling Date: Fri, 11 Nov 2022 15:47:34 +0000 Message-Id: <166818113574.3365943.966631047504377265.b4-ty@kernel.org> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20221107215644.1895162-1-oliver.upton@linux.dev> References: <20221107215644.1895162-1-oliver.upton@linux.dev> MIME-Version: 1.0 X-SA-Exim-Connect-IP: 185.219.108.64 X-SA-Exim-Rcpt-To: james.morse@arm.com, oliver.upton@linux.dev, alexandru.elisei@arm.com, qperret@google.com, peterx@redhat.com, kvm@vger.kernel.org, kvmarm@lists.cs.columbia.edu, will@kernel.org, kvmarm@lists.linux.dev, bgardon@google.com, ricarkol@google.com, linux-arm-kernel@lists.infradead.org, seanjc@google.com, reijiw@google.com, gshan@redhat.com, dmatlack@google.com X-SA-Exim-Mail-From: maz@kernel.org X-SA-Exim-Scanned: No (on disco-boy.misterjones.org); SAEximRunCond expanded to false Cc: kvm@vger.kernel.org, David Matlack , Ben Gardon , kvmarm@lists.linux.dev, Will Deacon , 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 Mon, 7 Nov 2022 21:56:30 +0000, Oliver Upton wrote: > Presently KVM only takes a read lock for stage 2 faults if it believes > the fault can be fixed by relaxing permissions on a PTE (write unprotect > for dirty logging). Otherwise, stage 2 faults grab the write lock, which > predictably can pile up all the vCPUs in a sufficiently large VM. > > Like the TDP MMU for x86, this series loosens the locking around > manipulations of the stage 2 page tables to allow parallel faults. RCU > and atomics are exploited to safely build/destroy the stage 2 page > tables in light of multiple software observers. > > [...] I've gone over this for quite a while, and while I'm still sh*t scared about it, I've decided to let it simmer in -next for a bit. If anything goes wrong or that someone spots something ugly, it will be easy to simply drop the branch. For simple fixes, they can go on top. [01/14] KVM: arm64: Combine visitor arguments into a context structure commit: dfc7a7769ab7f2a2f629c673717ef1fa7b63aa42 [02/14] KVM: arm64: Stash observed pte value in visitor context commit: 83844a2317ecad935f6735abd854e4bf3f757040 [03/14] KVM: arm64: Pass mm_ops through the visitor context commit: 2a611c7f87f26cca405da63a57f06d0e4dc14240 [04/14] KVM: arm64: Don't pass kvm_pgtable through kvm_pgtable_walk_data commit: fa002e8e79b3f980455ba585c1f47b26680de5b9 [05/14] KVM: arm64: Add a helper to tear down unlinked stage-2 subtrees commit: 8e94e1252cc054bb31fd3e9a15235cd831970ec1 [06/14] KVM: arm64: Use an opaque type for pteps commit: 6b91b8f95cadd3441c056182daf9024475ac4a91 [07/14] KVM: arm64: Tear down unlinked stage-2 subtree after break-before-make commit: 5c359cca1faf6d7671537fe1c240e8668467864d [08/14] KVM: arm64: Protect stage-2 traversal with RCU commit: c3119ae45dfb6038ca458ab5ba7a9fba2810845b [09/14] KVM: arm64: Atomically update stage 2 leaf attributes in parallel walks commit: ca5de2448c3b4c018fe3d6223df8b59068be1cd7 [10/14] KVM: arm64: Split init and set for table PTE commit: 331aa3a0547d1c794587e0df374d13b16645e832 [11/14] KVM: arm64: Make block->table PTE changes parallel-aware commit: 0ab12f3574db6cb432917a667f9392a88e8f0dfc [12/14] KVM: arm64: Make leaf->leaf PTE changes parallel-aware commit: 946fbfdf336b811479e024136c7cabc00157b6b9 [13/14] KVM: arm64: Make table->block changes parallel-aware commit: af87fc03cfdf6893011df419588d27acdfb9c197 [14/14] KVM: arm64: Handle stage-2 faults in parallel commit: 1577cb5823cefdff4416f272a88143ee933d97f5 Fingers crossed, M. -- Without deviation from the norm, progress is not possible. _______________________________________________ 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 385ABC433FE for ; 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Fri, 11 Nov 2022 15:47:37 +0000 From: Marc Zyngier To: James Morse , Oliver Upton , Alexandru Elisei Cc: Quentin Perret , Peter Xu , kvm@vger.kernel.org, kvmarm@lists.cs.columbia.edu, Will Deacon , kvmarm@lists.linux.dev, Ben Gardon , Ricardo Koller , linux-arm-kernel@lists.infradead.org, Sean Christopherson , Reiji Watanabe , Gavin Shan , David Matlack Subject: Re: [PATCH v5 00/14] KVM: arm64: Parallel stage-2 fault handling Date: Fri, 11 Nov 2022 15:47:34 +0000 Message-Id: <166818113574.3365943.966631047504377265.b4-ty@kernel.org> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20221107215644.1895162-1-oliver.upton@linux.dev> References: <20221107215644.1895162-1-oliver.upton@linux.dev> MIME-Version: 1.0 X-SA-Exim-Connect-IP: 185.219.108.64 X-SA-Exim-Rcpt-To: james.morse@arm.com, oliver.upton@linux.dev, alexandru.elisei@arm.com, qperret@google.com, peterx@redhat.com, kvm@vger.kernel.org, kvmarm@lists.cs.columbia.edu, will@kernel.org, kvmarm@lists.linux.dev, bgardon@google.com, ricarkol@google.com, linux-arm-kernel@lists.infradead.org, seanjc@google.com, reijiw@google.com, gshan@redhat.com, dmatlack@google.com X-SA-Exim-Mail-From: maz@kernel.org X-SA-Exim-Scanned: No (on disco-boy.misterjones.org); SAEximRunCond expanded to false X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20221111_074746_009838_E8968756 X-CRM114-Status: GOOD ( 13.61 ) 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 Mon, 7 Nov 2022 21:56:30 +0000, Oliver Upton wrote: > Presently KVM only takes a read lock for stage 2 faults if it believes > the fault can be fixed by relaxing permissions on a PTE (write unprotect > for dirty logging). Otherwise, stage 2 faults grab the write lock, which > predictably can pile up all the vCPUs in a sufficiently large VM. > > Like the TDP MMU for x86, this series loosens the locking around > manipulations of the stage 2 page tables to allow parallel faults. RCU > and atomics are exploited to safely build/destroy the stage 2 page > tables in light of multiple software observers. > > [...] I've gone over this for quite a while, and while I'm still sh*t scared about it, I've decided to let it simmer in -next for a bit. If anything goes wrong or that someone spots something ugly, it will be easy to simply drop the branch. For simple fixes, they can go on top. [01/14] KVM: arm64: Combine visitor arguments into a context structure commit: dfc7a7769ab7f2a2f629c673717ef1fa7b63aa42 [02/14] KVM: arm64: Stash observed pte value in visitor context commit: 83844a2317ecad935f6735abd854e4bf3f757040 [03/14] KVM: arm64: Pass mm_ops through the visitor context commit: 2a611c7f87f26cca405da63a57f06d0e4dc14240 [04/14] KVM: arm64: Don't pass kvm_pgtable through kvm_pgtable_walk_data commit: fa002e8e79b3f980455ba585c1f47b26680de5b9 [05/14] KVM: arm64: Add a helper to tear down unlinked stage-2 subtrees commit: 8e94e1252cc054bb31fd3e9a15235cd831970ec1 [06/14] KVM: arm64: Use an opaque type for pteps commit: 6b91b8f95cadd3441c056182daf9024475ac4a91 [07/14] KVM: arm64: Tear down unlinked stage-2 subtree after break-before-make commit: 5c359cca1faf6d7671537fe1c240e8668467864d [08/14] KVM: arm64: Protect stage-2 traversal with RCU commit: c3119ae45dfb6038ca458ab5ba7a9fba2810845b [09/14] KVM: arm64: Atomically update stage 2 leaf attributes in parallel walks commit: ca5de2448c3b4c018fe3d6223df8b59068be1cd7 [10/14] KVM: arm64: Split init and set for table PTE commit: 331aa3a0547d1c794587e0df374d13b16645e832 [11/14] KVM: arm64: Make block->table PTE changes parallel-aware commit: 0ab12f3574db6cb432917a667f9392a88e8f0dfc [12/14] KVM: arm64: Make leaf->leaf PTE changes parallel-aware commit: 946fbfdf336b811479e024136c7cabc00157b6b9 [13/14] KVM: arm64: Make table->block changes parallel-aware commit: af87fc03cfdf6893011df419588d27acdfb9c197 [14/14] KVM: arm64: Handle stage-2 faults in parallel commit: 1577cb5823cefdff4416f272a88143ee933d97f5 Fingers crossed, M. -- Without deviation from the norm, progress is not possible. _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel