From patchwork Tue Jan 7 23:37:20 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Anchal Agarwal X-Patchwork-Id: 1219174 X-Patchwork-Delegate: davem@davemloft.net Return-Path: X-Original-To: patchwork-incoming-netdev@ozlabs.org Delivered-To: patchwork-incoming-netdev@ozlabs.org Authentication-Results: ozlabs.org; spf=none (no SPF record) smtp.mailfrom=vger.kernel.org (client-ip=209.132.180.67; helo=vger.kernel.org; envelope-from=netdev-owner@vger.kernel.org; receiver=) Authentication-Results: ozlabs.org; dmarc=pass (p=quarantine dis=none) header.from=amazon.com Authentication-Results: ozlabs.org; dkim=pass (1024-bit key; unprotected) header.d=amazon.com header.i=@amazon.com header.b="PuTqZlWt"; dkim-atps=neutral Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by ozlabs.org (Postfix) with ESMTP id 47sphH4lJpz9sRK for ; Wed, 8 Jan 2020 10:37:35 +1100 (AEDT) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727490AbgAGXhd (ORCPT ); Tue, 7 Jan 2020 18:37:33 -0500 Received: from smtp-fw-2101.amazon.com ([72.21.196.25]:59528 "EHLO smtp-fw-2101.amazon.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726530AbgAGXhd (ORCPT ); Tue, 7 Jan 2020 18:37:33 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=amazon.com; i=@amazon.com; q=dns/txt; s=amazon201209; t=1578440252; x=1609976252; h=date:from:to:cc:subject:message-id:mime-version; bh=dHtsd6l+nawwSRlVfW2a/C6I9uYdvAsPi51+r+7Gmh4=; b=PuTqZlWt8oHBnAwd1ArYjmdMfRoOgGjNthmJhrk5/RPDub3Ld06W396I MHu4VibLPVrvgOceyN5BbmtjIG5eouNj2XWfKn3s8BQfEcBk8WNgaYfhO T7gYvdZPOrdn46fX6zw1REWOlCNFJnNQwii+U++jv7RhNYesUUdleXGRq s=; IronPort-SDR: zII1qidR+jA11P/idaDLlq5u230Nmzb0fNMF/8we7eclJgxeejhucz8dUyux0dxT5UvgMuuhQ6 IXmHidkTRA9w== X-IronPort-AV: E=Sophos;i="5.69,407,1571702400"; d="scan'208";a="11408213" Received: from iad12-co-svc-p1-lb1-vlan2.amazon.com (HELO email-inbound-relay-2b-c7131dcf.us-west-2.amazon.com) ([10.43.8.2]) by smtp-border-fw-out-2101.iad2.amazon.com with ESMTP; 07 Jan 2020 23:37:29 +0000 Received: from EX13MTAUWB001.ant.amazon.com (pdx4-ws-svc-p6-lb7-vlan2.pdx.amazon.com [10.170.41.162]) by email-inbound-relay-2b-c7131dcf.us-west-2.amazon.com (Postfix) with ESMTPS id D8B11A24D9; Tue, 7 Jan 2020 23:37:26 +0000 (UTC) Received: from EX13D07UWB003.ant.amazon.com (10.43.161.66) by EX13MTAUWB001.ant.amazon.com (10.43.161.207) with Microsoft SMTP Server (TLS) id 15.0.1367.3; Tue, 7 Jan 2020 23:37:20 +0000 Received: from EX13MTAUWB001.ant.amazon.com (10.43.161.207) by EX13D07UWB003.ant.amazon.com (10.43.161.66) with Microsoft SMTP Server (TLS) id 15.0.1367.3; Tue, 7 Jan 2020 23:37:20 +0000 Received: from dev-dsk-anchalag-2a-9c2d1d96.us-west-2.amazon.com (172.22.96.68) by mail-relay.amazon.com (10.43.161.249) with Microsoft SMTP Server id 15.0.1367.3 via Frontend Transport; Tue, 7 Jan 2020 23:37:20 +0000 Received: by dev-dsk-anchalag-2a-9c2d1d96.us-west-2.amazon.com (Postfix, from userid 4335130) id 5ACFC40E65; Tue, 7 Jan 2020 23:37:20 +0000 (UTC) Date: Tue, 7 Jan 2020 23:37:20 +0000 From: Anchal Agarwal To: , , , , , , , , , , , , , , , , , , , , , , , , , , , , CC: Subject: [RFC PATCH V2 01/11] xen/manage: keep track of the on-going suspend mode Message-ID: <20200107233720.GA17906@dev-dsk-anchalag-2a-9c2d1d96.us-west-2.amazon.com> MIME-Version: 1.0 Content-Disposition: inline User-Agent: Mutt/1.5.21 (2010-09-15) Sender: netdev-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org From: Munehisa Kamata Guest hibernation is different from xen suspend/resume/live migration. Xen save/restore does not use pm_ops as is needed by guest hibernation. Hibernation in guest follows ACPI path and is guest inititated , the hibernation image is saved within guest as compared to later modes which are xen toolstack assisted and image creation/storage is in control of hypervisor/host machine. To differentiate between Xen suspend and PM hibernation, keep track of the on-going suspend mode by mainly using a new PM notifier. Introduce simple functions which help to know the on-going suspend mode so that other Xen-related code can behave differently according to the current suspend mode. Since Xen suspend doesn't have corresponding PM event, its main logic is modfied to acquire pm_mutex and set the current mode. Though, acquirng pm_mutex is still right thing to do, we may see deadlock if PM hibernation is interrupted by Xen suspend. PM hibernation depends on xenwatch thread to process xenbus state transactions, but the thread will sleep to wait pm_mutex which is already held by PM hibernation context in the scenario. Xen shutdown code may need some changes to avoid the issue. [Anchal Changelog: Merged patch xen/manage: introduce helper function to know the on-going suspend mode into this one for better readability] Signed-off-by: Anchal Agarwal Signed-off-by: Munehisa Kamata --- drivers/xen/manage.c | 73 +++++++++++++++++++++++++++++++++++++++++++++++++++ include/xen/xen-ops.h | 3 +++ 2 files changed, 76 insertions(+) diff --git a/drivers/xen/manage.c b/drivers/xen/manage.c index cd046684e0d1..0b30ab522b77 100644 --- a/drivers/xen/manage.c +++ b/drivers/xen/manage.c @@ -14,6 +14,7 @@ #include #include #include +#include #include #include @@ -40,6 +41,31 @@ enum shutdown_state { /* Ignore multiple shutdown requests. */ static enum shutdown_state shutting_down = SHUTDOWN_INVALID; +enum suspend_modes { + NO_SUSPEND = 0, + XEN_SUSPEND, + PM_SUSPEND, + PM_HIBERNATION, +}; + +/* Protected by pm_mutex */ +static enum suspend_modes suspend_mode = NO_SUSPEND; + +bool xen_suspend_mode_is_xen_suspend(void) +{ + return suspend_mode == XEN_SUSPEND; +} + +bool xen_suspend_mode_is_pm_suspend(void) +{ + return suspend_mode == PM_SUSPEND; +} + +bool xen_suspend_mode_is_pm_hibernation(void) +{ + return suspend_mode == PM_HIBERNATION; +} + struct suspend_info { int cancelled; }; @@ -99,6 +125,10 @@ static void do_suspend(void) int err; struct suspend_info si; + lock_system_sleep(); + + suspend_mode = XEN_SUSPEND; + shutting_down = SHUTDOWN_SUSPEND; err = freeze_processes(); @@ -162,6 +192,10 @@ static void do_suspend(void) thaw_processes(); out: shutting_down = SHUTDOWN_INVALID; + + suspend_mode = NO_SUSPEND; + + unlock_system_sleep(); } #endif /* CONFIG_HIBERNATE_CALLBACKS */ @@ -387,3 +421,42 @@ int xen_setup_shutdown_event(void) EXPORT_SYMBOL_GPL(xen_setup_shutdown_event); subsys_initcall(xen_setup_shutdown_event); + +static int xen_pm_notifier(struct notifier_block *notifier, + unsigned long pm_event, void *unused) +{ + switch (pm_event) { + case PM_SUSPEND_PREPARE: + suspend_mode = PM_SUSPEND; + break; + case PM_HIBERNATION_PREPARE: + case PM_RESTORE_PREPARE: + suspend_mode = PM_HIBERNATION; + break; + case PM_POST_SUSPEND: + case PM_POST_RESTORE: + case PM_POST_HIBERNATION: + /* Set back to the default */ + suspend_mode = NO_SUSPEND; + break; + default: + pr_warn("Receive unknown PM event 0x%lx\n", pm_event); + return -EINVAL; + } + + return 0; +}; + +static struct notifier_block xen_pm_notifier_block = { + .notifier_call = xen_pm_notifier +}; + +static int xen_setup_pm_notifier(void) +{ + if (!xen_hvm_domain()) + return -ENODEV; + + return register_pm_notifier(&xen_pm_notifier_block); +} + +subsys_initcall(xen_setup_pm_notifier); diff --git a/include/xen/xen-ops.h b/include/xen/xen-ops.h index d89969aa9942..6c36e161dfd1 100644 --- a/include/xen/xen-ops.h +++ b/include/xen/xen-ops.h @@ -40,6 +40,9 @@ u64 xen_steal_clock(int cpu); int xen_setup_shutdown_event(void); +bool xen_suspend_mode_is_xen_suspend(void); +bool xen_suspend_mode_is_pm_suspend(void); +bool xen_suspend_mode_is_pm_hibernation(void); extern unsigned long *xen_contiguous_bitmap; #if defined(CONFIG_XEN_PV) || defined(CONFIG_ARM) || defined(CONFIG_ARM64)