From patchwork Thu Sep 9 01:38:10 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: 12482217 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=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 C416BC433EF for ; Thu, 9 Sep 2021 01:40:12 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 9DC8C60525 for ; Thu, 9 Sep 2021 01:40:12 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1350079AbhIIBlJ (ORCPT ); Wed, 8 Sep 2021 21:41:09 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:41802 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1349822AbhIIBkW (ORCPT ); Wed, 8 Sep 2021 21:40:22 -0400 Received: from mail-qk1-x74a.google.com (mail-qk1-x74a.google.com [IPv6:2607:f8b0:4864:20::74a]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 07F5FC06121D for ; Wed, 8 Sep 2021 18:38:50 -0700 (PDT) Received: by mail-qk1-x74a.google.com with SMTP id v21-20020a05620a0a9500b003d5c1e2f277so626328qkg.13 for ; Wed, 08 Sep 2021 18:38:49 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20210112; h=date:in-reply-to:message-id:mime-version:references:subject:from:to :cc; bh=Yfk/5WrJir9rO+SgiBvLfxyg0zqQRKPrsZnNMh9tI1o=; b=FgSapgo3yaUlpvIAly4RkNBRa/0qA3lF0DyIuIrdjIdtaxmdmuIUroC3uyKBKbQ2Xd kR4hWpfOMD9rb22wY8AFBOmYOLfN4II1R+lVC9aTcdt3gmRPrS/W196ot8+KlhY4BnT9 M2GiZU88/mreBK14pMjm1CkWQTMjZ0tWM450qgQ9W0KtMw18AJJ4SaLooZ+9FYgvmX27 U2hFwa0esk2pe//VsFkTgQsXo0igrc4duaftb5u8jt1ukrHIyPQuklw+Gp+K2p3C5SjM mk/HVxPaMqtogARws8ic6KGVZ98g1zuqtapnydinamsaCWx+Z3gm2ZDBPm+DTV2XR3Bt ouJw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:date:in-reply-to:message-id:mime-version :references:subject:from:to:cc; bh=Yfk/5WrJir9rO+SgiBvLfxyg0zqQRKPrsZnNMh9tI1o=; b=scXuun52Vdr9JMhHSu4lZ8dvn2Cpxr05eO4SjsRizm3zjFNa76rV83RTTZi4mqkghA BkR7LILqksrzkOMzwdqsqyrm1h2gdQdJN+NAXZwbsl2WqchT124kiHOpvxJxmanHTZf1 iWr3hJl7XHMel2LIKwQiRVzSRUyZ9Xn3yiJ+QEOysUZl6WszzXAdIZ2zpAr76mMIl8Ud CtPP/n5AvpBEawmKd7PBFKJxy5G43k8UUWDRRREQ8lHyIOCKMQRkDMVlokAtJ2tLhDEO RUDqoz9uuhJL5GVbhnNcedXO89lv5gQ33WfDBtinF4cc50rsnROjaUX91pN/Qju0W7zl wA7Q== X-Gm-Message-State: AOAM532QYvs3WFPNTA+1/Au+HbphIYu1EqcKKAMnhdalSsUpOWfRCvbo uoBltR8bTQp9VXIeiR7d25993m7lllIJ X-Google-Smtp-Source: ABdhPJyp7E3A1cxSEyAvlS2QydS7wrZHzQawCfhJXfTRBXJUnzLJ9TumzfCpUT57gEvgCPhYIsv52SzvFbmD X-Received: from rananta-virt.c.googlers.com ([fda3:e722:ac3:cc00:7f:e700:c0a8:1bcc]) (user=rananta job=sendgmr) by 2002:a05:6214:268e:: with SMTP id gm14mr466174qvb.51.1631151529165; Wed, 08 Sep 2021 18:38:49 -0700 (PDT) Date: Thu, 9 Sep 2021 01:38:10 +0000 In-Reply-To: <20210909013818.1191270-1-rananta@google.com> Message-Id: <20210909013818.1191270-11-rananta@google.com> Mime-Version: 1.0 References: <20210909013818.1191270-1-rananta@google.com> X-Mailer: git-send-email 2.33.0.153.gba50c8fa24-goog Subject: [PATCH v4 10/18] KVM: arm64: selftests: Add light-weight spinlock support 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 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 Reviewed-by: Oliver Upton Reviewed-by: Andrew Jones --- 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 5d05801ab816..61f0d376af99 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..a076e780be5d --- /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) +{ + int 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"); +}