From patchwork Sat Oct 19 17:15:41 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: David Woodhouse X-Patchwork-Id: 13842854 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 bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 4B846D3C926 for ; Sat, 19 Oct 2024 17:34:18 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender:List-Subscribe:List-Help :List-Post:List-Archive:List-Unsubscribe:List-Id:Content-Transfer-Encoding: MIME-Version:Message-ID:Date:Subject:To:From:Reply-To:Cc:Content-Type: Content-ID:Content-Description:Resent-Date:Resent-From:Resent-Sender: Resent-To:Resent-Cc:Resent-Message-ID:In-Reply-To:References:List-Owner; bh=5YLutNzESNkxMmo97oZ/EbstfXGBSrHKF7ypmg9VFCI=; b=igPcn2j7R8yArL9v+Snf0qD+64 Y7RN3o1hJCLGT0Y4nFtcJjohA6HPHdaAklw9Vyy1NJeBf/5czyuRNAiIIXoKu7nxDlB14ptKHI55t WkS9GqL1e982vbCX8OFZS7B4UIhvNkufKvTBmsBD4ee8YeFskSG1f+OOer2782R8f++DVuZrI4+3d E4rv2sHJbMBc2QvDtZkcd14Knl+2BNlSMf/ItMrHdae8+E9djwtZJyFsCADXmj63IvWVIjDs7gcQ9 Jst0ioFan0IbWWOX+zMojcScb4vulBfBgxCFOeXxkEaRL6jpvDpc5r9MylwTx12VeWbdJqC/gtsow +Ec0rJ1g==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.98 #2 (Red Hat Linux)) id 1t2DL4-00000003hGZ-3ojE; Sat, 19 Oct 2024 17:34:06 +0000 Received: from desiato.infradead.org ([2001:8b0:10b:1:d65d:64ff:fe57:4e05]) by bombadil.infradead.org with esmtps (Exim 4.98 #2 (Red Hat Linux)) id 1t2DCX-00000003fdr-2stY for linux-arm-kernel@bombadil.infradead.org; Sat, 19 Oct 2024 17:25:17 +0000 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=desiato.20200630; h=Sender:Content-Transfer-Encoding: MIME-Version:Message-ID:Date:Subject:To:From:Reply-To:Cc:Content-Type: Content-ID:Content-Description:In-Reply-To:References; bh=5YLutNzESNkxMmo97oZ/EbstfXGBSrHKF7ypmg9VFCI=; b=BnL39VAobe3LZZiasMKWHfLfbV zyMhUD3txQILUYDLEVbBB/02u0evfbEIbO+818gzUUDs8Iz0zYpQG+W63gC9fJ+DrJDymD68pWBh1 sWRCoABQFLB4+QwJTB8WAleNbygxnSsgjMf9v3eDJelskkYguREgwjFzK6bREvzJz0Celhnkhz/AM 4NTZO4AcuSKA1rPjq/iYEFZ5Mj5mBSNGn9VH7aOlvlJFoDXJcNmLZpN7Hh9j06TgDJ47g2U5aK//z 07JzNhzlgZPlUuN0lC4oXqW9b0iMwhIeWcnEjxpxw9VXI63DyZIx+54VItxgTfZPXwcsXOuVcKnuB ys8uo5kA==; Received: from [2001:8b0:10b:1::ebe] (helo=i7.infradead.org) by desiato.infradead.org with esmtpsa (Exim 4.98 #2 (Red Hat Linux)) id 1t2DCM-00000007ZXe-2yNP; Sat, 19 Oct 2024 17:25:07 +0000 Received: from dwoodhou by i7.infradead.org with local (Exim 4.97.1 #2 (Red Hat Linux)) id 1t2DCI-00000009TKV-2teL; Sat, 19 Oct 2024 18:25:02 +0100 From: David Woodhouse To: Paolo Bonzini , Jonathan Corbet , Marc Zyngier , Oliver Upton , James Morse , Suzuki K Poulose , Zenghui Yu , Catalin Marinas , Will Deacon , Mark Rutland , Lorenzo Pieralisi , "Rafael J. Wysocki" , Pavel Machek , Len Brown , Shuah Khan , David Woodhouse , kvm@vger.kernel.org, linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, kvmarm@lists.linux.dev, linux-pm@vger.kernel.org, linux-kselftest@vger.kernel.org, Francesco Lavra , Miguel Luis Subject: [PATCH v6 0/6] Add PSCI v1.3 SYSTEM_OFF2 support for hibernation Date: Sat, 19 Oct 2024 18:15:41 +0100 Message-ID: <20241019172459.2241939-1-dwmw2@infradead.org> X-Mailer: git-send-email 2.44.0 MIME-Version: 1.0 X-SRS-Rewrite: SMTP reverse-path rewritten from by desiato.infradead.org. See http://www.infradead.org/rpr.html X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org The PSCI v1.3 spec (https://developer.arm.com/documentation/den0022) adds support for a SYSTEM_OFF2 function enabling a HIBERNATE_OFF state which is analogous to ACPI S4. This will allow hosting environments to determine that a guest is hibernated rather than just powered off, and ensure that they preserve the virtual environment appropriately to allow the guest to resume safely (or bump the hardware_signature in the FACS to trigger a clean reboot instead). This updates KVM to support advertising PSCI v1.3, and unconditionally enables the SYSTEM_OFF2 support when PSCI v1.3 is enabled. For the guest side, add a new SYS_OFF_MODE_POWER_OFF handler with higher priority than the EFI one, but which *only* triggers when there's a hibernation in progress. There are other ways to do this (see the commit message for more details) but this seemed like the simplest. Version 2 of the patch series splits out the psci.h definitions into a separate commit (a dependency for both the guest and KVM side), and adds definitions for the other new functions added in v1.3. It also moves the pKVM psci-relay support to a separate commit; although in arch/arm64/kvm that's actually about the *guest* side of SYSTEM_OFF2 (i.e. using it from the host kernel, relayed through nVHE). Version 3 dropped the KVM_CAP which allowed userspace to explicitly opt in to the new feature like with SYSTEM_SUSPEND, and makes it depend only on PSCI v1.3 being exposed to the guest. Version 4 is no longer RFC, as the PSCI v1.3 spec is finally published. Minor fixes from the last round of review, and an added KVM self test. Version 5 drops some of the changes which didn't make it to the final v1.3 spec, and cleans up a couple of places which still referred to it as 'alpha' or 'beta'. It also temporarily drops the guest-side patch to invoke SYSTEM_OFF2 for hibernation, pending confirmation that the final PSCI v1.3 spec just has a typo where it changed to saying that 0x1 should be passed to mean HIBERNATE_OFF, even though it's advertised as bit 0. That can be sent under separate cover, and perhaps should have been anyway. The change in question doesn't matter for any of the KVM patches, because we just treat SYSTEM_OFF2 like the existing SYSTEM_RESET2, setting a flag to indicate that it was a SYSTEM_OFF2 call, but not actually caring about the argument; that's for userspace to worry about. Version 6 is updated to revision F.b of the specification, allowing both 0x0 and 0x1 to indicate HIBERNATE_OFF in the SYSTEM_OFF2 call, as well as disallowing anything but zero in the second argument. The test is expanded to cover those variants, and to require PSCI v1.3 instead of skipping on older kernels. The final guest-side patch in the series is reinstated, using zero as the argument for compatibility with existing hypervisors in the field as permitted by revision F.b. allows for zero as well as 0x1 for HIBERNATE_OFF to accommodate the change in the final version of the spec, and expands the test to cover both forms as well as checking that a non-zero second argument is correctly rejected. David Woodhouse (6): firmware/psci: Add definitions for PSCI v1.3 specification KVM: arm64: Add PSCI v1.3 SYSTEM_OFF2 function for hibernation KVM: arm64: Add support for PSCI v1.2 and v1.3 KVM: selftests: Add test for PSCI SYSTEM_OFF2 KVM: arm64: nvhe: Pass through PSCI v1.3 SYSTEM_OFF2 call arm64: Use SYSTEM_OFF2 PSCI call to power off for hibernate Documentation/virt/kvm/api.rst | 11 +++ arch/arm64/include/uapi/asm/kvm.h | 6 ++ arch/arm64/kvm/hyp/nvhe/psci-relay.c | 2 + arch/arm64/kvm/hypercalls.c | 2 + arch/arm64/kvm/psci.c | 50 ++++++++++++- drivers/firmware/psci/psci.c | 42 +++++++++++ include/kvm/arm_psci.h | 4 +- include/uapi/linux/psci.h | 5 ++ kernel/power/hibernate.c | 5 +- tools/testing/selftests/kvm/aarch64/psci_test.c | 93 +++++++++++++++++++++++++ 10 files changed, 217 insertions(+), 3 deletions(-)