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=-14.6 required=3.0 tests=BAYES_00,DKIMWL_WL_MED, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT,USER_IN_DEF_DKIM_WL 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 77746C433E0 for ; Wed, 22 Jul 2020 16:45:03 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 4B53E206C1 for ; Wed, 22 Jul 2020 16:45:03 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b="uicjnXpH" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728886AbgGVQpB (ORCPT ); Wed, 22 Jul 2020 12:45:01 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:44810 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726462AbgGVQpB (ORCPT ); Wed, 22 Jul 2020 12:45:01 -0400 Received: from mail-wr1-x444.google.com (mail-wr1-x444.google.com [IPv6:2a00:1450:4864:20::444]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id BD700C0619E0 for ; Wed, 22 Jul 2020 09:45:00 -0700 (PDT) Received: by mail-wr1-x444.google.com with SMTP id f1so2008729wro.2 for ; Wed, 22 Jul 2020 09:45:00 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20161025; h=from:to:cc:subject:date:message-id:mime-version :content-transfer-encoding; bh=uK8JM1EQn953l4hGDn7zKBHviQV8WaFyoUu/xfhEpC4=; b=uicjnXpHLyBycUGbJeXW1bnB5AdLJ1vIB5qSpkXxiiI0/QNUiM2C/tpeHlrOE1EsZW aYvVDSXzKs6F/PWWDz+eCkjv/alvVv8dpbsda0R9i3ZWyQdHh6OUTSKx0uG8uaq0E7Xc KeejKt/rn73e0BYz8UDnVX79SoUII3hDUDVVuUxuFDN+uBYJeKOeMmXMy4Ytimhaejil p7t0h/y68w3BjV9hhkphxrH3yBNiCjlrtyHfwKwGwjrx1P5gC6DlBWVRIH1SgPR8kx4b bOx5jIJM2pIUODErYnMEhS7zO/hOhG1NC1m8HlpCdo8FNK7fH/XWc8DkGZ5kiSLTc7eh nIlw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:mime-version :content-transfer-encoding; bh=uK8JM1EQn953l4hGDn7zKBHviQV8WaFyoUu/xfhEpC4=; b=DaOZKQ/KQEKb7XiPpAwMqdNpNves7r7F1k6NV5QJaJ7Ioenf0doDegVbEN8kCVSFAh qKnIy0oW6sd9LgFY6IURnPznjjPz1iBWpTXV0k1XeavqIm5AY+tTLnf7S4AbEw1TuJDS FTyJBiJSNt5DEzrb8J3t8scMyle34tNihPclE+RA/6FjULnyvZFw4tgcbepH25ZAOxGP myglVeWsI6BMYBZ80ECf89KuWyVLExURx6p7OSqGWpyQw9lvgv6l/iHCs+nAoq1BHen6 fCbZ3As7YaAVZ8y8mBgEVlV9Q2EwK7V5fpKtr4aRErXlaEPUoM51/f6Yp9+q+uCd1WpQ w0+w== X-Gm-Message-State: AOAM532axigdZCB02aPUp1FPhLLREozs1Xqce5NZ7xn/tFjyY+x61BbQ 4OhbTAFtRqgls/Guclf6mSr2Qw== X-Google-Smtp-Source: ABdhPJz2GhTgbxEm97Jbg+actM1Hl9ijg1JYz6533hzpsH9VeShzXrQ2seUMjDFp65Edaw0F/0nFQg== X-Received: by 2002:a5d:4649:: with SMTP id j9mr389718wrs.270.1595436299200; Wed, 22 Jul 2020 09:44:59 -0700 (PDT) Received: from localhost ([2a01:4b00:8523:2d03:b0ee:900a:e004:b9d0]) by smtp.gmail.com with ESMTPSA id p14sm517283wrx.90.2020.07.22.09.44.58 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Wed, 22 Jul 2020 09:44:58 -0700 (PDT) From: David Brazdil To: Catalin Marinas , Will Deacon , Marc Zyngier , Dennis Zhou , Tejun Heo , Christoph Lameter , Arnd Bergmann Cc: James Morse , Julien Thierry , Suzuki K Poulose , linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, kvmarm@lists.cs.columbia.edu, linux-arch@vger.kernel.org, kernel-team@google.com, David Brazdil Subject: [PATCH 0/9] Independent per-CPU data section for nVHE Date: Wed, 22 Jul 2020 17:44:15 +0100 Message-Id: <20200722164424.42225-1-dbrazdil@google.com> X-Mailer: git-send-email 2.27.0 MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Introduce '.hyp.data..percpu' as part of ongoing effort to make nVHE hyp code self-contained and independent of the rest of the kernel. The series builds on top of the "Split off nVHE hyp code" series which used objcopy to rename '.text' to '.hyp.text' and prefix all ELF symbols with '__kvm_nvhe' for all object files under kvm/hyp/nvhe. The series is structured as follows: - patch 1: Modify generic PERCPU_* linker script macros to make it possible to define multiple per-CPU ELF sections with prefixed section and symbol names. - patches 2-3: Replace hyp helpers for accessing per-CPU variables with common helpers modified to work correctly in hyp. Per-CPU variables can now be accessed with one API anywhere. - patches 4-6: Where VHE and nVHE use per-CPU variables defined in kernel proper, move their definitions to hyp/ where they are duplicated and owned by VHE/nVHE, respectively. Non-VHE hyp code now refers only to per-CPU variables defined in its source files. Helpers are added so that kernel proper can continue to access nVHE hyp variables, same way as it does with other nVHE symbols. - patches 7-9: Introduce '.hyp.data..percpu' ELF section and allocate memory for every CPU core during KVM init. All nVHE per-CPU state is now grouped together in ELF and in memory. Introducing a new per-CPU variable does not require adding new memory mappings any more. nVHE hyp code cannot accidentally refer to kernel-proper per-CPU data as it only has the pointer to its own per-CPU memory. The patches are rebased on current kvmarm/next (commit b72eb1f6813) and are available in branch 'topic/percpu' at: https://android-kvm.googlesource.com/linux David Brazdil (9): Macros to override naming of percpu symbols and sections kvm: arm64: Remove __hyp_this_cpu_read kvm: arm64: Remove hyp_adr/ldr_this_cpu kvm: arm64: Add helpers for accessing nVHE hyp per-cpu vars kvm: arm64: Duplicate arm64_ssbd_callback_required for nVHE hyp kvm: arm64: Create separate instances of kvm_host_data for VHE/nVHE kvm: arm64: Mark hyp stack pages reserved kvm: arm64: Set up hyp percpu data for nVHE kvm: arm64: Remove unnecessary hyp mappings arch/arm64/include/asm/assembler.h | 27 ++++-- arch/arm64/include/asm/kvm_asm.h | 74 ++++++++------- arch/arm64/include/asm/kvm_host.h | 2 +- arch/arm64/include/asm/kvm_mmu.h | 23 ++--- arch/arm64/include/asm/percpu.h | 33 ++++++- arch/arm64/include/asm/sections.h | 1 + arch/arm64/kernel/image-vars.h | 2 - arch/arm64/kernel/vmlinux.lds.S | 10 ++ arch/arm64/kvm/arm.c | 110 ++++++++++++++++++---- arch/arm64/kvm/hyp/hyp-entry.S | 2 +- arch/arm64/kvm/hyp/include/hyp/debug-sr.h | 4 +- arch/arm64/kvm/hyp/include/hyp/switch.h | 6 +- arch/arm64/kvm/hyp/nvhe/Makefile | 2 + arch/arm64/kvm/hyp/nvhe/switch.c | 8 +- arch/arm64/kvm/hyp/vhe/switch.c | 5 +- arch/arm64/kvm/hyp/vhe/sysreg-sr.c | 4 +- arch/arm64/kvm/pmu.c | 13 ++- include/asm-generic/vmlinux.lds.h | 40 +++++--- 18 files changed, 257 insertions(+), 109 deletions(-) -- 2.27.0