From patchwork Fri Aug 13 21:12:09 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: 12436209 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=-26.3 required=3.0 tests=BAYES_00,DKIMWL_WL_MED, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER,INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, USER_AGENT_GIT,USER_IN_DEF_DKIM_WL autolearn=ham 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 DBEEEC4338F for ; Fri, 13 Aug 2021 21:12:47 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id BF7D3610CC for ; Fri, 13 Aug 2021 21:12:47 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S234950AbhHMVNO (ORCPT ); Fri, 13 Aug 2021 17:13:14 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:45712 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S234934AbhHMVNN (ORCPT ); Fri, 13 Aug 2021 17:13:13 -0400 Received: from mail-pj1-x104a.google.com (mail-pj1-x104a.google.com [IPv6:2607:f8b0:4864:20::104a]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 6F67DC061756 for ; Fri, 13 Aug 2021 14:12:46 -0700 (PDT) Received: by mail-pj1-x104a.google.com with SMTP id gc3-20020a17090b3103b0290178c33479a3so998403pjb.7 for ; Fri, 13 Aug 2021 14:12:46 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20161025; h=date:in-reply-to:message-id:mime-version:references:subject:from:to :cc; bh=wYh8smn48aXYYcSZU2IfL26LMTAImxlTzaqpMoQB+vI=; b=iIGAVHZKcKykf2UqiNJ/VKf7aiay1nVLZHYOH8PaIA8fPmijWDk+FHZsqqA1SiHX1t P+ZdTARp1CHBoyv6p3tP0h77nFP0nImCCGLPusXOJimW2BlBJ7ge9ulg4sbg7sIPHzIE EcbnAXDoIhPtUK749za3Ou+LVywp2EKagHgVYHInRj39M9zUKkxzOx6QGK+xUHzDF/5W xV6ujJ9gZojENTSzqheUUk6LJaXSzTvR/ufOk8Gi+IoEI4fXdchr84z9es0nrmSwGmZT PYAQE9UKwZIs5nMxlKSLnuBvCHO6mgErDKed8ZcgUDSNC7NYvBt92cfdBp+SCvfoPCio s16w== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:date:in-reply-to:message-id:mime-version :references:subject:from:to:cc; bh=wYh8smn48aXYYcSZU2IfL26LMTAImxlTzaqpMoQB+vI=; b=CHiX39ujKGQCDhFxlKsxSUtLSbLG2gXmBviNPy43SLKdH8i5rQooum3GCOzZ7f5mBl +FZVyi73vQiDO8+EnUKN3YQLL36JiBrmjBQXJJs/YZcPuiineFUUnaw9g3v+jMoSaEB/ YyC7TfVXhSHUCLoRcDAcrx8MnsWVIQyXaBhDUxBjWiRzIUpmz1jSc6hAmtq3lFpXwwLB uJKFzXQlhCKYcsjJ3ohh7/34ii93iG94WpST60McaF5kqV7OZNo9vCrzJptd7c+PAxlq uf2hQcoxR3zr8mIgzapnF/vBOpHFzADyFDbLoqgw4keP7ImMSiQcIjMgHRN3Ron0cN93 HF5g== X-Gm-Message-State: AOAM532yLabTVEQRJD7eAd6ja7mybvhVtvnoizoZo72RhvAR+YDIg2dx wnl+8fCqtBQN0iTH4jVJlDIE9mzW1ng5 X-Google-Smtp-Source: ABdhPJzUyv3Nks/6akzkm7bz9MQ715ZbZPPEn21lRfbkNUcq/rc2orF4f9CipW4kCxAi5eDudD/vFX39FKh3 X-Received: from rananta-virt.c.googlers.com ([fda3:e722:ac3:cc00:7f:e700:c0a8:1bcc]) (user=rananta job=sendgmr) by 2002:a62:ee16:0:b029:2fe:ffcf:775a with SMTP id e22-20020a62ee160000b02902feffcf775amr4111078pfi.59.1628889165936; Fri, 13 Aug 2021 14:12:45 -0700 (PDT) Date: Fri, 13 Aug 2021 21:12:09 +0000 In-Reply-To: <20210813211211.2983293-1-rananta@google.com> Message-Id: <20210813211211.2983293-9-rananta@google.com> Mime-Version: 1.0 References: <20210813211211.2983293-1-rananta@google.com> X-Mailer: git-send-email 2.33.0.rc1.237.g0d66db33f3-goog Subject: [PATCH 08/10] KVM: arm64: selftests: Add light-weight spinlock support From: Raghavendra Rao Ananta To: Paolo Bonzini , Marc Zyngier Cc: Alexandru Elisei , Suzuki K Poulose , James Morse , Peter Shier , Ricardo Koller , Oliver Upton , Reiji Watanabe , Jing Zhang , Raghavendra Rao Anata , kvm@vger.kernel.org, kvmarm@lists.cs.columbia.edu Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org Add a simpler version of spinlock support for ARM64 for the guests to use. The implementation is loosely based on the spinlock implementation in kvm-unit-tests. Signed-off-by: Raghavendra Rao Ananta --- tools/testing/selftests/kvm/Makefile | 2 +- .../selftests/kvm/include/aarch64/spinlock.h | 13 +++++++++ .../selftests/kvm/lib/aarch64/spinlock.c | 27 +++++++++++++++++++ 3 files changed, 41 insertions(+), 1 deletion(-) create mode 100644 tools/testing/selftests/kvm/include/aarch64/spinlock.h create mode 100644 tools/testing/selftests/kvm/lib/aarch64/spinlock.c diff --git a/tools/testing/selftests/kvm/Makefile b/tools/testing/selftests/kvm/Makefile index 5832f510a16c..8f6d82b570bd 100644 --- a/tools/testing/selftests/kvm/Makefile +++ b/tools/testing/selftests/kvm/Makefile @@ -35,7 +35,7 @@ endif LIBKVM = lib/assert.c lib/elf.c lib/io.c lib/kvm_util.c lib/rbtree.c lib/sparsebit.c lib/test_util.c lib/guest_modes.c lib/perf_test_util.c LIBKVM_x86_64 = lib/x86_64/apic.c lib/x86_64/processor.c lib/x86_64/vmx.c lib/x86_64/svm.c lib/x86_64/ucall.c lib/x86_64/handlers.S -LIBKVM_aarch64 = lib/aarch64/processor.c lib/aarch64/ucall.c lib/aarch64/handlers.S +LIBKVM_aarch64 = lib/aarch64/processor.c lib/aarch64/ucall.c lib/aarch64/handlers.S lib/aarch64/spinlock.c LIBKVM_s390x = lib/s390x/processor.c lib/s390x/ucall.c lib/s390x/diag318_test_handler.c TEST_GEN_PROGS_x86_64 = x86_64/cr4_cpuid_sync_test diff --git a/tools/testing/selftests/kvm/include/aarch64/spinlock.h b/tools/testing/selftests/kvm/include/aarch64/spinlock.h new file mode 100644 index 000000000000..cf0984106d14 --- /dev/null +++ b/tools/testing/selftests/kvm/include/aarch64/spinlock.h @@ -0,0 +1,13 @@ +/* SPDX-License-Identifier: GPL-2.0 */ + +#ifndef SELFTEST_KVM_ARM64_SPINLOCK_H +#define SELFTEST_KVM_ARM64_SPINLOCK_H + +struct spinlock { + int v; +}; + +extern void spin_lock(struct spinlock *lock); +extern void spin_unlock(struct spinlock *lock); + +#endif /* SELFTEST_KVM_ARM64_SPINLOCK_H */ diff --git a/tools/testing/selftests/kvm/lib/aarch64/spinlock.c b/tools/testing/selftests/kvm/lib/aarch64/spinlock.c new file mode 100644 index 000000000000..6d66a3dac237 --- /dev/null +++ b/tools/testing/selftests/kvm/lib/aarch64/spinlock.c @@ -0,0 +1,27 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * ARM64 Spinlock support + */ +#include + +#include "spinlock.h" + +void spin_lock(struct spinlock *lock) +{ + uint32_t val, res; + + asm volatile( + "1: ldaxr %w0, [%2]\n" + " cbnz %w0, 1b\n" + " mov %w0, #1\n" + " stxr %w1, %w0, [%2]\n" + " cbnz %w1, 1b\n" + : "=&r" (val), "=&r" (res) + : "r" (&lock->v) + : "memory"); +} + +void spin_unlock(struct spinlock *lock) +{ + asm volatile("stlr wzr, [%0]\n" : : "r" (&lock->v) : "memory"); +}