From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 9138D33F8A1 for ; Sat, 28 Feb 2026 17:49:06 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1772300946; cv=none; b=puF1UXMHwJBL2drbVoreZA2SxR+UPYboL3sX50VQn5vKZbtsPYieHlP9lLikRPgrZettOwk93FCRr5rbfBPmS19TkDzMK7vJM4GyTqExk9Ra0he0N1HoieMzyvgXLtQPdJCQ+miZS+j6fq2xthBUpbCnReUPllqT7W592LBxPnA= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1772300946; c=relaxed/simple; bh=yL/3J+Kc+ufBQbQo8CUEsiiz0KXUEBwUey7O3oZpMAM=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=GZ8uShv49+cOopLsG04w/4xnirDWqs2I7+NG7HMwDNyrmWeCmInTmPoLupGleI+5cRpUzrkEaadhOeTRdL58Di7rIhEXDPUGy4tRRMly5aaWOeTSMDeSPq8V9bjku6QgPs0z6XEPerOhGAicA0Y5NBZP3nCQVx/+yvpQmNylGQA= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=Rrw1725I; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="Rrw1725I" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 00351C116D0; Sat, 28 Feb 2026 17:49:05 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1772300946; bh=yL/3J+Kc+ufBQbQo8CUEsiiz0KXUEBwUey7O3oZpMAM=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=Rrw1725IuNzn1eUJGsCdTSqWkKztlKsmMavY4213VHEr6oTxzxedU51ZOAJ7VQCdO XYhhpoKT5J056OT5vOYsy0BlHYfmXXOGOeB/QduqTnxnFIcyABVDUGgsbP7twcjifb YxikewcRAJudN5F+6RiTtWw7cTwBR35uxfonp1peAr5TCpcTnR/40NUX9ZJ60/hUb1 LEc8q21ogGTVBk9i70sEHgcaDbp2PIQ2IE66J5P5jLSmaauRt5cJGmKU4S1GBgI43S rS/35ZveXVbnlBdhIl/VoxOiIb7I7t84C6VwhuiHYuHt2K3pTOXBCmPy73Zey4I+93 jyrK4/erWzAGw== From: Sasha Levin To: patches@lists.linux.dev Cc: Jason Andryuk , Juergen Gross , Sasha Levin Subject: [PATCH 6.18 069/752] xenbus: Use .freeze/.thaw to handle xenbus devices Date: Sat, 28 Feb 2026 12:36:20 -0500 Message-ID: <20260228174750.1542406-69-sashal@kernel.org> X-Mailer: git-send-email 2.51.0 In-Reply-To: <20260228174750.1542406-1-sashal@kernel.org> References: <20260228174750.1542406-1-sashal@kernel.org> Precedence: bulk X-Mailing-List: patches@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore Content-Transfer-Encoding: 8bit From: Jason Andryuk [ Upstream commit e08dd1ee49838750a514e83c0aa60cd12ba6ecbb ] The goal is to fix s2idle and S3 for Xen PV devices. A domain resuming from s3 or s2idle disconnects its PV devices during resume. The backends are not expecting this and do not reconnect. b3e96c0c7562 ("xen: use freeze/restore/thaw PM events for suspend/ resume/chkpt") changed xen_suspend()/do_suspend() from PMSG_SUSPEND/PMSG_RESUME to PMSG_FREEZE/PMSG_THAW/PMSG_RESTORE, but the suspend/resume callbacks remained. .freeze/restore are used with hiberation where Linux restarts in a new place in the future. .suspend/resume are useful for runtime power management for the duration of a boot. The current behavior of the callbacks works for an xl save/restore or live migration where the domain is restored/migrated to a new location and connecting to a not-already-connected backend. Change xenbus_pm_ops to use .freeze/thaw/restore and drop the .suspend/resume hook. This matches the use in drivers/xen/manage.c for save/restore and live migration. With .suspend/resume empty, PV devices are left connected during s2idle and s3, so PV devices are not changed and work after resume. Signed-off-by: Jason Andryuk Acked-by: Juergen Gross Signed-off-by: Juergen Gross Message-ID: <20251119224731.61497-2-jason.andryuk@amd.com> Signed-off-by: Sasha Levin --- drivers/xen/xenbus/xenbus_probe_frontend.c | 4 +--- 1 file changed, 1 insertion(+), 3 deletions(-) diff --git a/drivers/xen/xenbus/xenbus_probe_frontend.c b/drivers/xen/xenbus/xenbus_probe_frontend.c index 6d1819269cbe5..199917b6f77ca 100644 --- a/drivers/xen/xenbus/xenbus_probe_frontend.c +++ b/drivers/xen/xenbus/xenbus_probe_frontend.c @@ -148,11 +148,9 @@ static void xenbus_frontend_dev_shutdown(struct device *_dev) } static const struct dev_pm_ops xenbus_pm_ops = { - .suspend = xenbus_dev_suspend, - .resume = xenbus_frontend_dev_resume, .freeze = xenbus_dev_suspend, .thaw = xenbus_dev_cancel, - .restore = xenbus_dev_resume, + .restore = xenbus_frontend_dev_resume, }; static struct xen_bus_type xenbus_frontend = { -- 2.51.0