From patchwork Mon Sep 13 23:09:46 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: 12490959 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 82F03C4321E for ; Mon, 13 Sep 2021 23:11:12 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 6617E60F46 for ; Mon, 13 Sep 2021 23:11:12 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1349410AbhIMXMW (ORCPT ); Mon, 13 Sep 2021 19:12:22 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:53262 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1349351AbhIMXL4 (ORCPT ); Mon, 13 Sep 2021 19:11:56 -0400 Received: from mail-yb1-xb4a.google.com (mail-yb1-xb4a.google.com [IPv6:2607:f8b0:4864:20::b4a]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id DF989C0613E0 for ; Mon, 13 Sep 2021 16:10:13 -0700 (PDT) Received: by mail-yb1-xb4a.google.com with SMTP id q17-20020a25b591000000b005a07d27bbdaso15000588ybj.3 for ; Mon, 13 Sep 2021 16:10:13 -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=iK83yniVjgitiMsPKE4heQ6oT5rN4oNwgLzQoyg5AZbIqAYzYHhPvLBF3Z3crr9r15 9U+ZxVXK13YUTjJZJ4Yz5pii/pFm/7uIvC8pAu63Tn+8Vu0GIJwOSYuDaEpBkNcskqWf fs9FJCplOKxOdfrEDqL2+nU1gOritaqPDtimBWNEaypbZDTErBxFjkHWtO1D2rylDVfo 3TOQq1XxOgSnD5Q6IfRthoDnW4h1H4/ngV0eT6/oJdj1/g1nKuOocfqESB9G6HVtqQWS 2Nd3LR006dsHJuBkVl7PKAQ1+7BFeF7935GxPhrgHW9uyt/R8Pqt+Svp/fX8KXAPFU65 /oBg== 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=ESdmnX5qj63Ov2gdhxG8U/CLA8hj1U3nrHuUyly91a20fURgHWkiIolXkz5t4dpqpC w7wNjOXWKTzZ7Gz4zW4Fo5bYWgzAREpirf3axzd2PV2YB3kLf2ZXVY5ggIz4girxVO8U VbxwDFQUwyVJpN6a9lj3pqA/U+hbOgJMblgvAWzDBWQ7/HF9kG561ypftD8PBPwrMApg +6SxCwbOOedYsi2r1WZLOt9rIR9/Aig/ijqwcDyoUP9k6kKYZQdeQ5M+fvqOI+lTVq3E reCCJ23RywdLoPtj2nDdL3U9BL5NkaQ1IbqBoCxkZLyuP1y6f2hnIpdy0rooQ9h1I1If +xaQ== X-Gm-Message-State: AOAM532BpFE7FlRe8gpyH28s96d7zMBx1p2i8XRAtCxGdEcwXqgOXunN xsGqbR8BvQlfqaJWPtUXmac9dJ8CS6IS X-Google-Smtp-Source: ABdhPJwOabcG17jAMTLXvpXjFejZRIOwG/0IcuiiiLvmT7OSJIRiMZN1Y4+nazea7PBvNbx2r7WJPaFvDsgB X-Received: from rananta-virt.c.googlers.com ([fda3:e722:ac3:cc00:7f:e700:c0a8:1bcc]) (user=rananta job=sendgmr) by 2002:a25:44d:: with SMTP id 74mr20148426ybe.54.1631574613117; Mon, 13 Sep 2021 16:10:13 -0700 (PDT) Date: Mon, 13 Sep 2021 23:09:46 +0000 In-Reply-To: <20210913230955.156323-1-rananta@google.com> Message-Id: <20210913230955.156323-6-rananta@google.com> Mime-Version: 1.0 References: <20210913230955.156323-1-rananta@google.com> X-Mailer: git-send-email 2.33.0.309.g3052b89438-goog Subject: [PATCH v6 05/14] 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")