From patchwork Thu Sep 9 01:38:05 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: 12482207 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 D4495C433F5 for ; Thu, 9 Sep 2021 01:38:44 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id B6F97611AF for ; Thu, 9 Sep 2021 01:38:44 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1349604AbhIIBjt (ORCPT ); Wed, 8 Sep 2021 21:39:49 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:41698 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1349514AbhIIBjq (ORCPT ); Wed, 8 Sep 2021 21:39:46 -0400 Received: from mail-pf1-x449.google.com (mail-pf1-x449.google.com [IPv6:2607:f8b0:4864:20::449]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 75CDAC061757 for ; Wed, 8 Sep 2021 18:38:37 -0700 (PDT) Received: by mail-pf1-x449.google.com with SMTP id i3-20020aa79083000000b003efb4fd360dso295111pfa.8 for ; Wed, 08 Sep 2021 18:38:37 -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=gnXKJQdV0c3R/PtxS6JEuqPswo+mI03RfMS+GJY9V2c=; b=qovCNdObk9hAYj5TRIstPpudmx6SP1gE3xKWc2RIyrpnrPqHTaRlABxqgUjn2zw7rT vEidP+eM7AUJIEqMeJgU88+wfjlSHF19U/ZiK9c6aesOhSvvkl4oRIUjCOTHPGyEZWay I37gnbfuZr2v8I5I5mxm2EC0V8EZ6yK+qOAnp+jtr324k5m51nzdTq56dzoHMs10+7zn 8u22Sqvehn7ThNOUO7HAFN5kRqbI2jP4+7K40fB+qnINSr4lmHmlxbbzeV/WnIy1E+x6 R3gWMpaynW+uiMBXTZa/08/31Czfo6HEvQtCL8VmjI/Mf0dUE+Al2Qvm46MSYSaI3WGq IYLg== 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=gnXKJQdV0c3R/PtxS6JEuqPswo+mI03RfMS+GJY9V2c=; b=nhmacivJ1wT+bDm1nmlx+T1A2ntjgojMxZXIrB/eBgQqVNwM4ON8CkW7uvWhRMe+xS Y3Yqr1C3r9YNhc05adr1G2U6l5baKyZ3Cj/zApwu9FKIMcw+Mq2RcNVaKJXIJA4urfWO 3dEp1IobvWhghHhpQe+z+ztjzAh8s+IureujzOzpgR81Ty6NG8HYRkLyRauePZ44lccu Kqi7eqEAy/+WJOEWax6I0fU+6kHMt1p2dF7iukktmIpyI5thgjZtQKA5ehnZXC1h2ftB 90FQqM10S0pDiIuRZGE0ceqIBnJr7ZFngeRnB6iHdn7rGGwYZ5KXXEHFXHY+URLhSDVZ ixEQ== X-Gm-Message-State: AOAM532vgrE0yiVf/1UlHQa1Y19Xhk3syZOqHjyAmTnoz+vEUcE9cL7u dJ5+lMrT6egV5N5pd3u2Ax/cjKC6kRmt X-Google-Smtp-Source: ABdhPJzYobbwdhjyH3noMxa1HCPANLozf7zYs5UxTopZ642KuVhxcHxiSRq8EQ2ySUHCdPtjJlAquY0U4s3l X-Received: from rananta-virt.c.googlers.com ([fda3:e722:ac3:cc00:7f:e700:c0a8:1bcc]) (user=rananta job=sendgmr) by 2002:aa7:9693:0:b0:412:448c:89c6 with SMTP id f19-20020aa79693000000b00412448c89c6mr616147pfk.82.1631151516895; Wed, 08 Sep 2021 18:38:36 -0700 (PDT) Date: Thu, 9 Sep 2021 01:38:05 +0000 In-Reply-To: <20210909013818.1191270-1-rananta@google.com> Message-Id: <20210909013818.1191270-6-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 05/18] 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 ac8b63f8aab7..166d273ad715 100644 --- a/tools/testing/selftests/kvm/include/aarch64/processor.h +++ b/tools/testing/selftests/kvm/include/aarch64/processor.h @@ -134,6 +134,11 @@ 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")