From patchwork Tue Apr 12 13:12:53 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Marc Zyngier X-Patchwork-Id: 12810805 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 vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id AD5EFC433EF for ; Tue, 12 Apr 2022 13:21:55 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1355373AbiDLNYI (ORCPT ); Tue, 12 Apr 2022 09:24:08 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:56708 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1356323AbiDLNXH (ORCPT ); Tue, 12 Apr 2022 09:23:07 -0400 Received: from ams.source.kernel.org (ams.source.kernel.org [145.40.68.75]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 4AA4B218B for ; Tue, 12 Apr 2022 06:13:56 -0700 (PDT) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ams.source.kernel.org (Postfix) with ESMTPS id D650AB81D76 for ; Tue, 12 Apr 2022 13:13:54 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 766A5C385A5; Tue, 12 Apr 2022 13:13:53 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1649769233; bh=3RoMGxcoj6ldO5clo4J4GuibpjgvSYGpjgzHSrg9Xfk=; h=From:To:Cc:Subject:Date:From; b=Lnh5aQWvNYQHxAKP1r6WsxA9f0WBWqBHazaF1W6rRIuIKGqYgcIICYIYL8DDoKjJA tOFmaVpsmHxoPYni3VCox96Dt7wkieKyGMPHIlFyUZRaSEwyfctKMYctbj3DNreZmL 32b7YzLZtNhPGSo67xt6vkAvsHhjYJtqw5MY2bNUeDjrWaUvVzV2V5YKjFSaoYX7fm IW2lgRUEXiuPBILRE74o9VjafLEx24//QrNoUDbpZHP3vQnG80d/A01WHIY1qHZiNO +lRC2M5Bnd3cD0d660fqs/lgTChMhxikEV4tbVlwGhrFcNZuWgqsjaDNVzfgyo1PLb 3HFj9UoNktOzw== Received: from sofa.misterjones.org ([185.219.108.64] helo=why.lan) by disco-boy.misterjones.org with esmtpsa (TLS1.3) tls TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 (Exim 4.94.2) (envelope-from ) id 1neGL9-003mvX-2I; Tue, 12 Apr 2022 14:13:51 +0100 From: Marc Zyngier To: linux-arm-kernel@lists.infradead.org, kvmarm@lists.cs.columbia.edu, kvm@vger.kernel.org Cc: Catalin Marinas , Will Deacon , Mark Rutland , James Morse , Suzuki K Poulose , Alexandru Elisei , kernel-team@android.com Subject: [PATCH 00/10] arm64: Add initial support for FEAT_WFxT Date: Tue, 12 Apr 2022 14:12:53 +0100 Message-Id: <20220412131303.504690-1-maz@kernel.org> X-Mailer: git-send-email 2.34.1 MIME-Version: 1.0 X-SA-Exim-Connect-IP: 185.219.108.64 X-SA-Exim-Rcpt-To: linux-arm-kernel@lists.infradead.org, kvmarm@lists.cs.columbia.edu, kvm@vger.kernel.org, catalin.marinas@arm.com, will@kernel.org, mark.rutland@arm.com, james.morse@arm.com, suzuki.poulose@arm.com, alexandru.elisei@arm.com, kernel-team@android.com X-SA-Exim-Mail-From: maz@kernel.org X-SA-Exim-Scanned: No (on disco-boy.misterjones.org); SAEximRunCond expanded to false Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org The ARMv8.7 WFxT feature is a new take on the good old WFI/WFE instructions as they behave the same way, only taking an extra timeout parameter. This small series aims at adding the minimal support for this feature, enabling it for both the kernel and KVM. A potential addition to this series would be to remove the event generation from the counters, and rely on the timeout where it matters (spinlocks?). Feedback welcome. Patches on top of 5.18-rc2, tested of the FVP AEM. Marc Zyngier (10): arm64: Expand ESR_ELx_WFx_ISS_TI to match its ARMv8.7 definition arm64: Add RV and RN fields for ESR_ELx_WFx_ISS KVM: arm64: Simplify kvm_cpu_has_pending_timer() KVM: arm64: Introduce kvm_counter_compute_delta() helper KVM: arm64: Handle blocking WFIT instruction KVM: arm64: Offer early resume for non-blocking WFxT instructions KVM: arm64: Expose the WFXT feature to guests arm64: Add HWCAP advertising FEAT_WFXT arm64: Add wfet()/wfit() helpers arm64: Use WFxT for __delay() when possible Documentation/arm64/cpu-feature-registers.rst | 2 + Documentation/arm64/elf_hwcaps.rst | 4 ++ arch/arm64/include/asm/barrier.h | 4 ++ arch/arm64/include/asm/esr.h | 8 +++- arch/arm64/include/asm/hwcap.h | 1 + arch/arm64/include/asm/kvm_host.h | 1 + arch/arm64/include/uapi/asm/hwcap.h | 1 + arch/arm64/kernel/cpufeature.c | 13 +++++ arch/arm64/kernel/cpuinfo.c | 1 + arch/arm64/kvm/arch_timer.c | 47 ++++++++++++------- arch/arm64/kvm/arm.c | 6 +-- arch/arm64/kvm/handle_exit.c | 30 ++++++++++-- arch/arm64/kvm/sys_regs.c | 2 + arch/arm64/lib/delay.c | 12 ++++- arch/arm64/tools/cpucaps | 1 + include/kvm/arm_arch_timer.h | 2 - 16 files changed, 106 insertions(+), 29 deletions(-)