From patchwork Mon Sep 13 20:49:16 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Raghavendra Rao Ananta X-Patchwork-Id: 12490761 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=-21.3 required=3.0 tests=BAYES_00,DKIMWL_WL_MED, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT, USER_IN_DEF_DKIM_WL autolearn=unavailable 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 9BD5BC433EF for ; Mon, 13 Sep 2021 20:49:50 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 83E0E610E7 for ; Mon, 13 Sep 2021 20:49:50 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1344387AbhIMUvD (ORCPT ); Mon, 13 Sep 2021 16:51:03 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:49818 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S244620AbhIMUu5 (ORCPT ); Mon, 13 Sep 2021 16:50:57 -0400 Received: from mail-qv1-xf4a.google.com (mail-qv1-xf4a.google.com [IPv6:2607:f8b0:4864:20::f4a]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id DBFBEC061574 for ; Mon, 13 Sep 2021 13:49:40 -0700 (PDT) Received: by mail-qv1-xf4a.google.com with SMTP id cf6-20020a05621403e600b0037a70d2f960so13983324qvb.13 for ; Mon, 13 Sep 2021 13:49:40 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20210112; h=date:message-id:mime-version:subject:from:to:cc; bh=j/4YFFEj93EYD5WXf9YhC7NiAQuOqnV1NemoThsXtqE=; b=IPeTbH6lQdFamt3b7Tb/2xRM1jLlcSwFvG4WsYT5hnT6EMqTUpeyNP9Q0EMEESnG+y mwn5pNuQC8QLoEeNL+SzNMdQtxLCtVRGINTbTU8aWlHMtwJcUx1P/OCJfUcpg8SZiR68 MK/wGDciELJREoks3wbmCGmyRyJgHR7zJ+1/jVt53r9qTEpqlM0snS02rwSDKbExmJo9 DUujW/UBLD9EsFPbNUQaHcSsz1rreCiceFEuaoBPtweFwlaSvIF+bWTuhpRJKLiXS5Rh nhBzsXOZbcUJwDup0UtvcprxwbYfyCJFE7OA+sB/aZF6QYRhxfCo+2vcgoeLCucVOcMz 0yNw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:date:message-id:mime-version:subject:from:to:cc; bh=j/4YFFEj93EYD5WXf9YhC7NiAQuOqnV1NemoThsXtqE=; b=q4RfeDcV3sxBxXG50QVEDOVEczzta2wsioK7iTJrPa9IvgCBAPXxC27V78aR1UeAED aZTxMFyeFE8H0lw2WZPPsDY//3/3k36MGi9Q34Wok5Hgb3nR7fulgB9VwQTBfmAHBOLZ fdQEQ8N2NiDdP018UZW/tuE/h65Ri6WOfGAdoP+ZfF6VEj8x0/CFndy28VKarF7iz9mT xUdfzQ2EPGKx7XSk92NBwASs4YZT7D+Et0T8Lj4pNl2SiW8mD+gek5pK8nSUNSxlM1He IxZjMOayXSpQ9qYVrGDvI2yYYooN4Ufv/knHOzar62xgowWFXetEjZ71pE6WBXGUBfnZ jkPw== X-Gm-Message-State: AOAM5335+6Wu4aBmYBOiL+SUrDQRnxtlhsp28gPISYGqvQ3TMvc54J+l tATvrJly2Go+DjspQ8qLI/pyzTw1p7uY X-Google-Smtp-Source: ABdhPJyTVe0omAS5aJxAkvc8VJVrflvztp/o84xfhKX8w1tQ7xA5MKckSQrMC8KVXUOJe06IXs+h5Jz39cHR X-Received: from rananta-virt.c.googlers.com ([fda3:e722:ac3:cc00:7f:e700:c0a8:1bcc]) (user=rananta job=sendgmr) by 2002:a0c:8064:: with SMTP id 91mr1557900qva.66.1631566179948; Mon, 13 Sep 2021 13:49:39 -0700 (PDT) Date: Mon, 13 Sep 2021 20:49:16 +0000 Message-Id: <20210913204930.130715-1-rananta@google.com> Mime-Version: 1.0 X-Mailer: git-send-email 2.33.0.309.g3052b89438-goog Subject: [PATCH v5 00/14] KVM: arm64: selftests: Introduce arch_timer selftest From: Raghavendra Rao Ananta To: Paolo Bonzini , Marc Zyngier , Andrew Jones , James Morse , Alexandru Elisei , Suzuki K Poulose Cc: Catalin Marinas , Will Deacon , Peter Shier , Ricardo Koller , Oliver Upton , Reiji Watanabe , Jing Zhang , Raghavendra Rao Anata , linux-arm-kernel@lists.infradead.org, kvmarm@lists.cs.columbia.edu, linux-kernel@vger.kernel.org, kvm@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org Hello, The patch series adds a KVM selftest to validate the behavior of ARM's generic timer (patch-13). The test programs the timer IRQs periodically, and for each interrupt, it validates the behaviour against the architecture specifications. The test further provides a command-line interface to configure the number of vCPUs, the period of the timer, and the number of iterations that the test has to run for. Patch-14 adds an option to randomly migrate the vCPUs to different physical CPUs across the system. The bug for the fix provided by Marc with commit 3134cc8beb69d0d ("KVM: arm64: vgic: Resample HW pending state on deactivation") was discovered using arch_timer test with vCPU migrations. Since the test heavily depends on interrupts, patch-12 adds a host library to setup ARM Generic Interrupt Controller v3 (GICv3). This includes creating a vGIC device, setting up distributor and redistributor attributes, and mapping the guest physical addresses. Symmetrical to this, patch-11 adds a guest library to talk to the vGIC, which includes initializing the controller, enabling/disabling the interrupts, and so on. The following patches are utility patches that the above ones make use of: Patch-1 adds readl/writel support for guests to access MMIO space. Patch-2 imports arch/arm64/include/asm/sysreg.h into tools/arch/arm64/include/asm/ to make use of the register encodings and read/write definitions. Patch-3 is not directly related to the test, but makes aarch64/debug-exceptions.c use the read/write definitions from the imported sysreg.h and remove the existing definitions of read_sysreg() and write_sysreg(). Patch-4 introduces ARM64_SYS_KVM_REG, that helps convert the SYS_* register encodings in sysreg.h to be acceptable by get_reg() and set_reg(). It further replaces the users of ARM64_SYS_REG to use the new macro. Patch-5 adds the support for cpu_relax(). Patch-6 adds basic arch_timer framework. Patch-7 adds udelay() support for the guests to utilize. Patch-8 adds local_irq_enable() and local_irq_disable() for the guests to enable/disable interrupts. Patch-9 adds the support to get the vcpuid for the guests. This allows them to access any cpu-centric private data in the upcoming patches. Patch-10 adds a light-weight support for spinlocks for the guests to use. The patch series, specifically the library support, is derived from the kvm-unit-tests and the kernel itself. Regards, Raghavendra v4 -> v5: Addressed the comments by Andrew, Oliver, and Reiji (Thanks, again): - Squashed patches 17/18 and 18/18 into 3/18 and 14/18, respectively. - Dropped patches to keep track kvm_utils of nr_vcpus (12/18) and vm_get_mode() (13/18) as they were no longer needed. - Instead of creating the a map, exporting the vcpuid to the guest is done by using the TPIDR_EL1 register. - Just to be on the safer side, gic.c's gic_dist_init() explicitly checks if gic_ops is NULL. - Move sysreg.h from within selftests to tool/arch/arm64/include/asm/. - Rename ARM64_SYS_KVM_REG to KVM_ARM64_SYS_REG to improve readability. - Use the GIC regions' sizes from asm/kvm.h instead of re-defining it in the vgic host support. - Get the timer IRQ numbers via timer's device attributes (KVM_ARM_VCPU_TIMER_IRQ_PTIMER, KVM_ARM_VCPU_TIMER_IRQ_VTIMER) instead of depending on default numbers to be safe. - Add check to see if the vCPU migrations are in fact enabled, before looking for at least two online physical CPUs for the test. - Add missing blank lines in the arch_timer test. v3 -> v4: Addressed the comments by Andrew, Oliver, and Ricardo (Thank you): - Reimplemented get_vcpuid() by exporting a map of vcpuid:mpidr to the guest. - Import sysreg.h from arch/arm64/include/asm/sysreg.h to get the system register encodings and its read/write support. As a result, delete the existing definitions in processor.h. - Introduce ARM64_SYS_KVM_REG that converts SYS_* register definitions from sysreg.h into the encodings accepted by get_reg() and set_reg(). - Hence, remove the existing encodings of system registers (CPACR_EL1, TCR_EL1, and friends) and replace all the its consumers throughout the selftests with ARM64_SYS_KVM_REG. - Keep track of number of vCPUs in 'struct kvm_vm'. - Add a helper method to get the KVM VM's mode. - Modify the vGIC host function vgic_v3_setup to make use of the above two helper methods, which prevents it from accepting nr_vcpus as an argument. - Move the definition of REDIST_REGION_ATTR_ADDR from lib/aarch64/vgic.c to include/aarch64/vgic.h. - Make the selftest, vgic_init.c, use the definition of REDIST_REGION_ATTR_ADDR from include/aarch64/vgic.h. - Turn ON vCPU migration by default (-m 2). - Add pr_debug() to log vCPU migrations. Helpful for diagnosis. - Change TEST_ASSERT(false,...) to TEST_FAIL() in the base arch_timer test. - Include linux/types.h for __force definitions. - Change the type of 'val' to 'int' in spin_lock() to match the lock value type. - Fix typos in code files and comments. v2 -> v3: - Addressed the comments from Ricardo regarding moving the vGIC host support for selftests to its own library. - Added an option (-m) to migrate the guest vCPUs to physical CPUs in the system. v1 -> v2: Addressed comments from Zenghui in include/aarch64/arch_timer.h: - Correct the header description - Remove unnecessary inclusion of linux/sizes.h - Re-arrange CTL_ defines in ascending order - Remove inappropriate 'return' from timer_set_* functions, which returns 'void'. v1: https://lore.kernel.org/kvmarm/20210813211211.2983293-1-rananta@google.com/ v2: https://lore.kernel.org/kvmarm/20210818184311.517295-1-rananta@google.com/ v3: https://lore.kernel.org/kvmarm/20210901211412.4171835-1-rananta@google.com/ v4: https://lore.kernel.org/kvmarm/20210909013818.1191270-1-rananta@google.com/ Raghavendra Rao Ananta (14): KVM: arm64: selftests: Add MMIO readl/writel support tools: arm64: Import sysreg.h KVM: arm64: selftests: Use read/write definitions from sysreg.h KVM: arm64: selftests: Introduce ARM64_SYS_KVM_REG KVM: arm64: selftests: Add support for cpu_relax KVM: arm64: selftests: Add basic support for arch_timers KVM: arm64: selftests: Add basic support to generate delays KVM: arm64: selftests: Add support to disable and enable local IRQs KVM: arm64: selftests: Add guest support to get the vcpuid KVM: arm64: selftests: Add light-weight spinlock support KVM: arm64: selftests: Add basic GICv3 support KVM: arm64: selftests: Add host support for vGIC KVM: arm64: selftests: Add arch_timer test KVM: arm64: selftests: arch_timer: Support vCPU migration tools/arch/arm64/include/asm/sysreg.h | 1278 +++++++++++++++++ tools/testing/selftests/kvm/.gitignore | 1 + tools/testing/selftests/kvm/Makefile | 3 +- .../selftests/kvm/aarch64/arch_timer.c | 479 ++++++ .../selftests/kvm/aarch64/debug-exceptions.c | 30 +- .../selftests/kvm/aarch64/psci_cpu_on_test.c | 2 +- .../testing/selftests/kvm/aarch64/vgic_init.c | 3 +- .../kvm/include/aarch64/arch_timer.h | 142 ++ .../selftests/kvm/include/aarch64/delay.h | 25 + .../selftests/kvm/include/aarch64/gic.h | 21 + .../selftests/kvm/include/aarch64/processor.h | 88 +- .../selftests/kvm/include/aarch64/spinlock.h | 13 + .../selftests/kvm/include/aarch64/vgic.h | 20 + .../testing/selftests/kvm/include/kvm_util.h | 2 + tools/testing/selftests/kvm/lib/aarch64/gic.c | 95 ++ .../selftests/kvm/lib/aarch64/gic_private.h | 21 + .../selftests/kvm/lib/aarch64/gic_v3.c | 240 ++++ .../selftests/kvm/lib/aarch64/gic_v3.h | 70 + .../selftests/kvm/lib/aarch64/processor.c | 22 +- .../selftests/kvm/lib/aarch64/spinlock.c | 27 + .../testing/selftests/kvm/lib/aarch64/vgic.c | 70 + 21 files changed, 2606 insertions(+), 46 deletions(-) create mode 100644 tools/arch/arm64/include/asm/sysreg.h create mode 100644 tools/testing/selftests/kvm/aarch64/arch_timer.c create mode 100644 tools/testing/selftests/kvm/include/aarch64/arch_timer.h create mode 100644 tools/testing/selftests/kvm/include/aarch64/delay.h create mode 100644 tools/testing/selftests/kvm/include/aarch64/gic.h create mode 100644 tools/testing/selftests/kvm/include/aarch64/spinlock.h create mode 100644 tools/testing/selftests/kvm/include/aarch64/vgic.h create mode 100644 tools/testing/selftests/kvm/lib/aarch64/gic.c create mode 100644 tools/testing/selftests/kvm/lib/aarch64/gic_private.h create mode 100644 tools/testing/selftests/kvm/lib/aarch64/gic_v3.c create mode 100644 tools/testing/selftests/kvm/lib/aarch64/gic_v3.h create mode 100644 tools/testing/selftests/kvm/lib/aarch64/spinlock.c create mode 100644 tools/testing/selftests/kvm/lib/aarch64/vgic.c