From patchwork Tue Sep 14 22:31:04 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: 12495007 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 85079C4332F for ; Tue, 14 Sep 2021 22:31:47 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 726D361175 for ; Tue, 14 Sep 2021 22:31:47 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S235902AbhINWdC (ORCPT ); Tue, 14 Sep 2021 18:33:02 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:39536 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S235674AbhINWcw (ORCPT ); Tue, 14 Sep 2021 18:32:52 -0400 Received: from mail-yb1-xb49.google.com (mail-yb1-xb49.google.com [IPv6:2607:f8b0:4864:20::b49]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 7AAEAC061574 for ; Tue, 14 Sep 2021 15:31:34 -0700 (PDT) Received: by mail-yb1-xb49.google.com with SMTP id f64-20020a2538430000b0290593bfc4b046so925898yba.9 for ; Tue, 14 Sep 2021 15:31:34 -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=VREX88yx9xWzleHW1ZEh6k892sL/xPpdGpps/n5mOO0=; b=lq/RxhWNVx7HvcaPCnLIvkYwVN/qajC6Z/TJt7BjQwh2kiG8aYIi9XXaH0fBS2ObXi uE6/PIk3diZR5P/av9EkChN11F3yxn4ytG2jrnfrPhRGWUQURMRhLO13q9wfpwCR7A5g 7/RM69WnbITiPwIbs0CKxqrkVixmM0zXsLIHEQ1wRoh9YknzbX05OpiklsPNYRuGulYJ ieHH741AlkpjfWugkGP71HaL/RjstLd4VOJDdNdvowz1eyiO3NYovGHA5UHOVGx1wlXU yW88zoT/uvTdgcLKGt87Xg/M64lmUFO4TbQhZOSwiPy7azMCeLzAURvn+KJL+pQF/9m8 vfNA== 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=VREX88yx9xWzleHW1ZEh6k892sL/xPpdGpps/n5mOO0=; b=0cEYj7tfSbXY3cGkxzbDnuZpi5meIu1RajtIAjy9PWTnMSbaoJPntE1ncg0qzrjDXt knnYLJUqpmxMGFh1VY7lybMoQW8zT0y+U1i9fS/2sOGEX91tJJFxSwKDbYY06ZhhE67k IzC7w6S5kLnJIgHcimhH/rj5fO/vQMlElI42GHV9w4F2tV2xSjICv2PQWxtw6gJxRAPJ Tq5Gzy/aNivO1CJso1MVjqCmolLFpAlvs6FRnUJyBDzJpbx6kbyodoZXjIB6iHVh9Uy5 EG5uovYZqOZQB5O2oHDl1+pz8tR8aI3Hn7hDukad6QjCFBQyvHSw84tRRKN71yhP8zEo p2kQ== X-Gm-Message-State: AOAM530ey4pdv0Tpxk12ZbocPck898VxsW879kyyxaMKwE3tcCCgTD/t 2omXudG4qxIOVaNSUw134QpAzY1awp2E X-Google-Smtp-Source: ABdhPJyLk4QgmytoSzKirQaQHCryllAwONOUAJ9rKEqFuwJe5coEC6Nmu0X3brEpwZMn9TH/d1w9gy2iCB0z X-Received: from rananta-virt.c.googlers.com ([fda3:e722:ac3:cc00:7f:e700:c0a8:1bcc]) (user=rananta job=sendgmr) by 2002:a25:61c8:: with SMTP id v191mr1965131ybb.472.1631658693708; Tue, 14 Sep 2021 15:31:33 -0700 (PDT) Date: Tue, 14 Sep 2021 22:31:04 +0000 In-Reply-To: <20210914223114.435273-1-rananta@google.com> Message-Id: <20210914223114.435273-6-rananta@google.com> Mime-Version: 1.0 References: <20210914223114.435273-1-rananta@google.com> X-Mailer: git-send-email 2.33.0.309.g3052b89438-goog Subject: [PATCH v7 05/15] KVM: arm64: selftests: Add support for cpu_relax 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 Implement the guest helper routine, cpu_relax(), to yield the processor to other tasks. The function was derived from arch/arm64/include/asm/vdso/processor.h. Signed-off-by: Raghavendra Rao Ananta Reviewed-by: Oliver Upton Reviewed-by: Andrew Jones --- tools/testing/selftests/kvm/include/aarch64/processor.h | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/tools/testing/selftests/kvm/include/aarch64/processor.h b/tools/testing/selftests/kvm/include/aarch64/processor.h index 93797783abad..265054c24481 100644 --- a/tools/testing/selftests/kvm/include/aarch64/processor.h +++ b/tools/testing/selftests/kvm/include/aarch64/processor.h @@ -122,6 +122,11 @@ void vm_install_exception_handler(struct kvm_vm *vm, void vm_install_sync_handler(struct kvm_vm *vm, int vector, int ec, handler_fn handler); +static inline void cpu_relax(void) +{ + asm volatile("yield" ::: "memory"); +} + #define isb() asm volatile("isb" : : : "memory") #define dsb(opt) asm volatile("dsb " #opt : : : "memory") #define dmb(opt) asm volatile("dmb " #opt : : : "memory")