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 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 809E2C433F5 for ; Thu, 7 Oct 2021 23:35:05 +0000 (UTC) Received: from mm01.cs.columbia.edu (mm01.cs.columbia.edu [128.59.11.253]) by mail.kernel.org (Postfix) with ESMTP id 2875A6137F for ; Thu, 7 Oct 2021 23:35:05 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.4.1 mail.kernel.org 2875A6137F 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 BE90A4B261; Thu, 7 Oct 2021 19:35:04 -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 UeZQ00GE1hIf; Thu, 7 Oct 2021 19:35:03 -0400 (EDT) Received: from mm01.cs.columbia.edu (localhost [127.0.0.1]) by mm01.cs.columbia.edu (Postfix) with ESMTP id 7BE484B2AA; Thu, 7 Oct 2021 19:35:03 -0400 (EDT) Received: from localhost (localhost [127.0.0.1]) by mm01.cs.columbia.edu (Postfix) with ESMTP id B52FA4B2A6 for ; Thu, 7 Oct 2021 19:35:01 -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 YBEMF6nkbvNy for ; Thu, 7 Oct 2021 19:35:00 -0400 (EDT) Received: from mail-pl1-f201.google.com (mail-pl1-f201.google.com [209.85.214.201]) by mm01.cs.columbia.edu (Postfix) with ESMTPS id C0C6E4086F for ; Thu, 7 Oct 2021 19:34:59 -0400 (EDT) Received: by mail-pl1-f201.google.com with SMTP id h3-20020a170902704300b0013dbfc88e14so3936308plt.13 for ; Thu, 07 Oct 2021 16:34:59 -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=QCcnWTVJdJc/WAVPcR4BCLp4hc0ky0D9nmZjxgNJgVQ=; b=J5Xmgczz4lCb1dmoGGK6T6UZMU3ZtPCtrRXDQAc6dfW6LAwT8mz2PBkLySX1KSf/0g iQZqLnqge4KAsH/UvJmnm/n3CQOLLG6pAJ0Cx5rukprVcc6cwYVvpz1bOqENfeEaaruC X20RMPoyACae29WQ+cawAHGZUYS82Efud+HKLHfSPV7Fl3rX+lDN94Ld9EwLH5IRfDEq pk9ZtxsGNPChSqqouYSArHov4QBv8UxeeWA7gIvtLlb1k9ECUSkk30AR+dZfbUZyXc5z fkn0kyfE5037sVahR8CYLc/NjJuhH+AeLPd+7KRl0+Bg6KW4twZcZJQpKqPUoIIgeyjP JE9g== 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=QCcnWTVJdJc/WAVPcR4BCLp4hc0ky0D9nmZjxgNJgVQ=; b=ADpAm1ccNPcBZ44SeWcDOGAGZwMcGIIf76gcdSxrAaHx2j9AhFLGCvvgiKzHbcjNZ6 q3IwknCZw21MRFlDNP4bxB73vBCmJf8JpF3ZnrI891ei6Nx0VwJwXYlC41TDM85Fi0R9 0GgDnIZdjTgDe9Kbn5U7HZ6jZGPhUBAnBXmmnx/MY1t6JEtpDrESVhZg9QIuIM81cyTE Tl/uZIjnI2yzfQSfdySFcRvB+ZkmMzVqt8WqFJNMTGnEK79/IXYjMFp/z6lflEF9GTVe aiAPtzwCl26QyWVq+3IV5KitTmbZr0Gjw2RksgtS/5zCmoITPWVbGPgSfUI/lsSvNgt6 aMEA== X-Gm-Message-State: AOAM533XICPhmdlzKh+Xne8E+j6LDrml9cWCklCYCIyGUC7o9Rz0/hgK /FQYpYb6g77nlMjKGa+cZUIBQpmCpKa6 X-Google-Smtp-Source: ABdhPJyGGErVlG3DR0iUPDgUz2iB0THZPL0Jyz4yWpFGkWw4/28sh4UQq1A0wYRTefCNFOZlSuAEIlv+DBxt X-Received: from rananta-virt.c.googlers.com ([fda3:e722:ac3:cc00:7f:e700:c0a8:1bcc]) (user=rananta job=sendgmr) by 2002:a17:902:a3c1:b0:13a:47a:1c5a with SMTP id q1-20020a170902a3c100b0013a047a1c5amr6510759plb.13.1633649698763; Thu, 07 Oct 2021 16:34:58 -0700 (PDT) Date: Thu, 7 Oct 2021 23:34:29 +0000 In-Reply-To: <20211007233439.1826892-1-rananta@google.com> Message-Id: <20211007233439.1826892-6-rananta@google.com> Mime-Version: 1.0 References: <20211007233439.1826892-1-rananta@google.com> X-Mailer: git-send-email 2.33.0.882.g93a45727a2-goog Subject: [PATCH v8 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: 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 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") -- 2.33.0.882.g93a45727a2-goog _______________________________________________ kvmarm mailing list kvmarm@lists.cs.columbia.edu https://lists.cs.columbia.edu/mailman/listinfo/kvmarm