From mboxrd@z Thu Jan 1 00:00:00 1970 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=-16.5 required=3.0 tests=BAYES_00, DKIM_ADSP_CUSTOM_MED,DKIM_INVALID,DKIM_SIGNED,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER,INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, URIBL_BLOCKED,USER_AGENT_GIT 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 7D128C4332F for ; Thu, 9 Sep 2021 01:38:43 +0000 (UTC) Received: from mm01.cs.columbia.edu (mm01.cs.columbia.edu [128.59.11.253]) by mail.kernel.org (Postfix) with ESMTP id 2FAE561167 for ; Thu, 9 Sep 2021 01:38:43 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.4.1 mail.kernel.org 2FAE561167 Authentication-Results: mail.kernel.org; dmarc=fail (p=reject dis=none) header.from=google.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=lists.cs.columbia.edu Received: from localhost (localhost [127.0.0.1]) by mm01.cs.columbia.edu (Postfix) with ESMTP id CCD904B090; Wed, 8 Sep 2021 21:38:42 -0400 (EDT) X-Virus-Scanned: at lists.cs.columbia.edu Authentication-Results: mm01.cs.columbia.edu (amavisd-new); dkim=softfail (fail, message has been altered) header.i=@google.com Received: from mm01.cs.columbia.edu ([127.0.0.1]) by localhost (mm01.cs.columbia.edu [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id Mk+OzMifRZWB; Wed, 8 Sep 2021 21:38:41 -0400 (EDT) Received: from mm01.cs.columbia.edu (localhost [127.0.0.1]) by mm01.cs.columbia.edu (Postfix) with ESMTP id D39E44B11A; Wed, 8 Sep 2021 21:38:40 -0400 (EDT) Received: from localhost (localhost [127.0.0.1]) by mm01.cs.columbia.edu (Postfix) with ESMTP id DA7304B0E2 for ; Wed, 8 Sep 2021 21:38:39 -0400 (EDT) X-Virus-Scanned: at lists.cs.columbia.edu Received: from mm01.cs.columbia.edu ([127.0.0.1]) by localhost (mm01.cs.columbia.edu [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 4GoETi4FVVEG for ; Wed, 8 Sep 2021 21:38:38 -0400 (EDT) Received: from mail-pg1-f201.google.com (mail-pg1-f201.google.com [209.85.215.201]) by mm01.cs.columbia.edu (Postfix) with ESMTPS id DDCF94A5A0 for ; Wed, 8 Sep 2021 21:38:37 -0400 (EDT) Received: by mail-pg1-f201.google.com with SMTP id q22-20020a63e956000000b002524787adb1so161158pgj.3 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=vD13XvZ6fjmxyHRmpmanECXAsVnBQPNsuj+G8Qf44G+hSSgvP7grDh6y7q2RYB9WTR fzyEZ+kpCa67vmfZUm0N2NXkMD7lpm8wasl9nQfD8oRHCj9EsSasoXt3d8DIVowjZf0D GrCQIpmPwa4C9FnSagjXMVFzwKuWmvsYxVf6ZZkrq1OWzrHFegW3VN6YTdDeDgVX2Cx6 38d3m1o7n2/grW8+4y3uVlxTUHkESPN0epxClx7gBhqEmdDC1na51EAhm6kIqrhzcVQF XvTD2zO4UDxeBC6Rx+T5CUKAl5jiuvq9dF4apnX8U6PKNUJDPpWIyWmTnBolaOBwTJsd 9D2A== X-Gm-Message-State: AOAM533mQsrZnL8IxN0VClpDY6mYD2DkBJ2cS45nR0265T6hFBNDcVp4 RMNnS1LJIg+BTTNvqj0i5Uyxdpwg9DuC 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: kvm@vger.kernel.org, Catalin Marinas , Peter Shier , linux-kernel@vger.kernel.org, Will Deacon , kvmarm@lists.cs.columbia.edu, linux-arm-kernel@lists.infradead.org X-BeenThere: kvmarm@lists.cs.columbia.edu X-Mailman-Version: 2.1.14 Precedence: list List-Id: Where KVM/ARM decisions are made List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Errors-To: kvmarm-bounces@lists.cs.columbia.edu Sender: kvmarm-bounces@lists.cs.columbia.edu 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") -- 2.33.0.153.gba50c8fa24-goog _______________________________________________ kvmarm mailing list kvmarm@lists.cs.columbia.edu https://lists.cs.columbia.edu/mailman/listinfo/kvmarm