From patchwork Tue Mar 1 17:31:20 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Jason A. Donenfeld" X-Patchwork-Id: 12764952 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 197FBC433EF for ; Tue, 1 Mar 2022 17:31:39 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S235169AbiCARcR (ORCPT ); Tue, 1 Mar 2022 12:32:17 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:54856 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S234133AbiCARcQ (ORCPT ); Tue, 1 Mar 2022 12:32:16 -0500 Received: from dfw.source.kernel.org (dfw.source.kernel.org [139.178.84.217]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 347EA5DA48; Tue, 1 Mar 2022 09:31:35 -0800 (PST) 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 dfw.source.kernel.org (Postfix) with ESMTPS id C435561239; Tue, 1 Mar 2022 17:31:34 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 7CABCC340EE; Tue, 1 Mar 2022 17:31:33 +0000 (UTC) Authentication-Results: smtp.kernel.org; dkim=pass (1024-bit key) header.d=zx2c4.com header.i=@zx2c4.com header.b="kSUnqs4v" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=zx2c4.com; s=20210105; t=1646155891; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding; bh=Vc1xIBQ1Y9jEN/LhtA0lgOP4L65isWSwshwxlAZspDE=; b=kSUnqs4v2IVp+YuDS1e7pn6+F98MVwNpcjppSRzGy7fGds2LOyzaZS/ZFVArBHWJxieIM+ 5ETfadQ7LlOXQgGPRJkrzRSCEFfOhA8bTPIEpbUk6dZKiT6UUQXGu0cOAja/n21jbh+u2H y7i0P8HolV9DAXdbcn10tABUEuPNC+Y= Received: by mail.zx2c4.com (ZX2C4 Mail Server) with ESMTPSA id bae3578b (TLSv1.3:AEAD-AES256-GCM-SHA384:256:NO); Tue, 1 Mar 2022 17:31:31 +0000 (UTC) From: "Jason A. Donenfeld" To: rafael@kernel.org, pavel@ucw.cz, len.brown@intel.com, linux-kernel@vger.kernel.org, linux-pm@vger.kernel.org Cc: "Jason A. Donenfeld" Subject: [PATCH] PM: notify of PM_POST_VMFORK events from vmgenid Date: Tue, 1 Mar 2022 18:31:20 +0100 Message-Id: <20220301173120.297105-1-Jason@zx2c4.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-pm@vger.kernel.org There's an additional virtual power state that various crypto-oriented drivers may benefit from being notified of, such as WireGuard: right after a virtual machine has forked. In WireGuard's case, the PM notifier there that clears keys pre-suspend will be adjusted to also clear them post-vmfork. This trivial commit wires up the machinery for that change, which builds on the recently added vmgenid driver in the random.git tree. Cc: Rafael J. Wysocki Cc: Pavel Machek Cc: Len Brown Signed-off-by: Jason A. Donenfeld --- drivers/virt/vmgenid.c | 2 ++ include/linux/suspend.h | 4 ++++ kernel/power/main.c | 6 ++++++ 3 files changed, 12 insertions(+) diff --git a/drivers/virt/vmgenid.c b/drivers/virt/vmgenid.c index 0ae1a39f2e28..4bef3e8b3476 100644 --- a/drivers/virt/vmgenid.c +++ b/drivers/virt/vmgenid.c @@ -10,6 +10,7 @@ #include #include #include +#include #include ACPI_MODULE_NAME("vmgenid"); @@ -75,6 +76,7 @@ static void vmgenid_notify(struct acpi_device *device, u32 event) if (!memcmp(old_id, state->this_id, sizeof(old_id))) return; add_vmfork_randomness(state->this_id, sizeof(state->this_id)); + pm_notify_vmfork(); } static const struct acpi_device_id vmgenid_ids[] = { diff --git a/include/linux/suspend.h b/include/linux/suspend.h index 300273ff40cc..a3836473b87b 100644 --- a/include/linux/suspend.h +++ b/include/linux/suspend.h @@ -477,6 +477,7 @@ static inline int is_hibernate_resume_dev(dev_t dev) { return 0; } #define PM_POST_SUSPEND 0x0004 /* Suspend finished */ #define PM_RESTORE_PREPARE 0x0005 /* Going to restore a saved image */ #define PM_POST_RESTORE 0x0006 /* Restore failed */ +#define PM_POST_VMFORK 0x0007 /* Virtual machine has just forked */ extern struct mutex system_transition_mutex; @@ -487,6 +488,7 @@ void restore_processor_state(void); /* kernel/power/main.c */ extern int register_pm_notifier(struct notifier_block *nb); extern int unregister_pm_notifier(struct notifier_block *nb); +extern void pm_notify_vmfork(void); extern void ksys_sync_helper(void); #define pm_notifier(fn, pri) { \ @@ -525,6 +527,8 @@ static inline int unregister_pm_notifier(struct notifier_block *nb) return 0; } +static inline void pm_notify_vmfork(void) {} + static inline void ksys_sync_helper(void) {} #define pm_notifier(fn, pri) do { (void)(fn); } while (0) diff --git a/kernel/power/main.c b/kernel/power/main.c index 7e646079fbeb..a64cfb36b1b3 100644 --- a/kernel/power/main.c +++ b/kernel/power/main.c @@ -94,6 +94,12 @@ int pm_notifier_call_chain(unsigned long val) return blocking_notifier_call_chain(&pm_chain_head, val, NULL); } +void pm_notify_vmfork(void) +{ + pm_notifier_call_chain(PM_POST_VMFORK); +} +EXPORT_SYMBOL_GPL(pm_notify_vmfork); + /* If set, devices may be suspended and resumed asynchronously. */ int pm_async_enabled = 1;