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 vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 839FEC433EF for ; Wed, 4 May 2022 12:01:46 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1349244AbiEDMFT (ORCPT ); Wed, 4 May 2022 08:05:19 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:42892 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1348784AbiEDMFR (ORCPT ); Wed, 4 May 2022 08:05:17 -0400 Received: from sin.source.kernel.org (sin.source.kernel.org [145.40.73.55]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id BDF7F15710; Wed, 4 May 2022 05:01:41 -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 sin.source.kernel.org (Postfix) with ESMTPS id 2C244CE25F7; Wed, 4 May 2022 12:01:40 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 48C5EC385A5; Wed, 4 May 2022 12:01:38 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1651665698; bh=f4hC2KhYd/3nrH7HJufsZ3yV+queO1t2VtGxafx1XMA=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=Ko9JTTVBW9yoeXypyEb4JFJE3B1qHylz3xFpeypBr1hBZ5b3qbmHQ1Pgvo4WYYShj ymPwWQHqIRwwvU/24xUKuUJva0Ytt0htk/gk5jjnvkeHgwItytW2hEpdjt/2zgCq+u cb7XRw8fcoxhNA5BYZsGI1yj/TW8c2lf4b3z2OPr7jPqFc4rQOEk8uFtEI7PV7GCsW 8012b31rG8Tfja3h9EEqJhi0sn5OlXy0emmoB0HkVH1lNf1rfjMEz/dNzYahPPt44I hjVq+qY+dYaKg6jDHYeq2tfCkDMGFgkdjkzSxPftq5SDg/C0HdEo3SdIlVOFEtU7Wh rRgQ+6Mn3FMjw== Received: from sofa.misterjones.org ([185.219.108.64] helo=hot-poop.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 1nmDhH-008tMH-UH; Wed, 04 May 2022 13:01:36 +0100 From: Marc Zyngier To: Oliver Upton , kvmarm@lists.cs.columbia.edu Cc: linux-arm-kernel@lists.infradead.org, james.morse@arm.com, kvm@vger.kernel.org, alexandru.elisei@arm.com, reijiw@google.com, ricarkol@google.com, linux-kernel@vger.kernel.org, suzuki.poulose@arm.com Subject: Re: [PATCH v6 00/12] KVM: arm64: PSCI SYSTEM_SUSPEND support Date: Wed, 4 May 2022 13:01:33 +0100 Message-Id: <165166565256.3774994.10199439605875188884.b4-ty@kernel.org> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20220504032446.4133305-1-oupton@google.com> References: <20220504032446.4133305-1-oupton@google.com> MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 8bit X-SA-Exim-Connect-IP: 185.219.108.64 X-SA-Exim-Rcpt-To: oupton@google.com, kvmarm@lists.cs.columbia.edu, linux-arm-kernel@lists.infradead.org, james.morse@arm.com, kvm@vger.kernel.org, alexandru.elisei@arm.com, reijiw@google.com, ricarkol@google.com, linux-kernel@vger.kernel.org, suzuki.poulose@arm.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: linux-kernel@vger.kernel.org On Wed, 4 May 2022 03:24:34 +0000, Oliver Upton wrote: > The PSCI v1.0 specification describes a call, SYSTEM_SUSPEND, which > allows software to request that the system be placed into the lowest > possible power state and await a wakeup event. This call is optional > in v1.0 and v1.1. KVM does not currently support this optional call. > > This series adds support for the PSCI SYSTEM_SUSPEND call to KVM/arm64. > For reasons best described in patch 8, it is infeasible to correctly > implement PSCI SYSTEM_SUSPEND (or any system-wide event for that matter) > in a split design between kernel/userspace. As such, this series cheaply > exits to userspace so it can decide what to do with the call. This > series also gives userspace some help to emulate suspension with a new > MP state that awaits an unmasked pending interrupt. > > [...] Applied to next, thanks! [01/12] KVM: arm64: Don't depend on fallthrough to hide SYSTEM_RESET2 commit: 5bc2cb95ad03d866422d7b3f19ec42a6720f3262 [02/12] KVM: arm64: Dedupe vCPU power off helpers commit: 1e5794295c5dbfcc31cf5de840c9e095ae50efb7 [03/12] KVM: arm64: Track vCPU power state using MP state values commit: b171f9bbb130cb323f2101edd32da2a25d43ebfa [04/12] KVM: arm64: Rename the KVM_REQ_SLEEP handler commit: 1c6219e3faf12e58d520b3b2cdfa8cd5e1efc9a5 [05/12] KVM: arm64: Return a value from check_vcpu_requests() commit: 3fdd04592d38bb31a0bea567d9a66672b484bed3 [06/12] KVM: arm64: Add support for userspace to suspend a vCPU commit: 7b33a09d036ffd9a04506122840629c7e870cf08 [07/12] KVM: arm64: Implement PSCI SYSTEM_SUSPEND commit: bfbab44568779e1682bc6f63688bb9c965f0e74a [08/12] selftests: KVM: Rename psci_cpu_on_test to psci_test commit: bf08515d39cb843c81f991ee67ff543eecdba0c3 [09/12] selftests: KVM: Create helper for making SMCCC calls commit: e918e2bc52c8ac1cccd6ef822ac23eded41761b6 [10/12] selftests: KVM: Use KVM_SET_MP_STATE to power off vCPU in psci_test commit: d135399a97cc3e27716a8e468a5fd1a209346831 [11/12] selftests: KVM: Refactor psci_test to make it amenable to new tests commit: 67a36a821312e9c0d2a2f7e6c2225204500cc01c [12/12] selftests: KVM: Test SYSTEM_SUSPEND PSCI call commit: b26dafc8a9e74254a390e8f21ff028a2573ee4fc Cheers, M. -- Without deviation from the norm, progress is not possible.