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 kanga.kvack.org (kanga.kvack.org [205.233.56.17]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 53E9EFF8867 for ; Mon, 27 Apr 2026 21:08:05 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id BFDF86B0088; Mon, 27 Apr 2026 17:08:04 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id BD5A56B008A; Mon, 27 Apr 2026 17:08:04 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id AEBEE6B008C; Mon, 27 Apr 2026 17:08:04 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from relay.hostedemail.com (smtprelay0012.hostedemail.com [216.40.44.12]) by kanga.kvack.org (Postfix) with ESMTP id 9EF326B0088 for ; Mon, 27 Apr 2026 17:08:04 -0400 (EDT) Received: from smtpin19.hostedemail.com (lb01a-stub [10.200.18.249]) by unirelay04.hostedemail.com (Postfix) with ESMTP id 67E8B1A0312 for ; Mon, 27 Apr 2026 21:08:04 +0000 (UTC) X-FDA: 84705573288.19.98BF37F Received: from tor.source.kernel.org (tor.source.kernel.org [172.105.4.254]) by imf05.hostedemail.com (Postfix) with ESMTP id ED5F1100002 for ; Mon, 27 Apr 2026 21:08:02 +0000 (UTC) Authentication-Results: imf05.hostedemail.com; dkim=pass header.d=kernel.org header.s=k20201202 header.b=FGEjjy4F; spf=pass (imf05.hostedemail.com: domain of helgaas@kernel.org designates 172.105.4.254 as permitted sender) smtp.mailfrom=helgaas@kernel.org; dmarc=pass (policy=quarantine) header.from=kernel.org ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1777324082; h=from:from:sender:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc:cc:mime-version:mime-version: content-type:content-type:content-transfer-encoding: in-reply-to:in-reply-to:references:dkim-signature; bh=nULIG7ClBBNI/AWIbW76qlekbMCSvE2pfN+/Fn6exkg=; b=AQMDtD3S6uGdf7Wno7Iop4eOiW3q5uHq2FM87w2ZyuZgpTBcVyAudclFk7P6I5IsnApUau D/VwRNhEjDz9BICoFXqaxk+akESOs9xN+w7ypZyxHMRZenyTRZZsCxd05JgJyeNBSvHsTn KN132rVEef2/ROXVFECaT+pO62+ywb4= ARC-Authentication-Results: i=1; imf05.hostedemail.com; dkim=pass header.d=kernel.org header.s=k20201202 header.b=FGEjjy4F; spf=pass (imf05.hostedemail.com: domain of helgaas@kernel.org designates 172.105.4.254 as permitted sender) smtp.mailfrom=helgaas@kernel.org; dmarc=pass (policy=quarantine) header.from=kernel.org ARC-Seal: i=1; s=arc-20220608; d=hostedemail.com; t=1777324082; a=rsa-sha256; cv=none; b=ZyFmJOrcF8Kwd7+A0s69PhfWhMgxM3qD4oTz0PFyhmlEnRqKYcmTHCYdLF0CfmzF46zDro plLPpdXCboqAjYoHzDnOYu9IhaL7rWLqq+bib0CLyk41wxsbbKtPJu/SK5qpNFBaS+y6RC ht+0TFchoeql45LMJIiop1+HzGPb5p4= Received: from smtp.kernel.org (transwarp.subspace.kernel.org [100.75.92.58]) by tor.source.kernel.org (Postfix) with ESMTP id 76E9160139; Mon, 27 Apr 2026 21:08:02 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 010B0C19425; Mon, 27 Apr 2026 21:08:02 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1777324082; bh=HAhIww82BvlkJia3sROkCN1IHhF5mIbxG7w4f+smGgw=; h=Date:From:To:Cc:Subject:In-Reply-To:From; b=FGEjjy4FAaFY3A5PuDOdwJ8Xj4EEJiA4g1yL5cIGR7Vn92lO9AV/7gQgs0RIJp88+ RSTByY/JniJOtzZ0Blkp+9wjKoA/q3uA/W4Os0CJ2ORUAWPdqd+ACdpKfo/pIUhQ/n Qz/f5MkmYFlb4sXREbt/X0QQc7hmBvgosVjVBeM8qOrO81b8+/BOPDEXGa885+Ix5I avII16tNuOj8GG1TOOxM4oUwXtc8+P8ELkjcrD4GHUMnMVFQWLd8ZhsTj4bKZOsp2d akjmbU2gDr8yaabA9KPzS3D4e/OQNnGX3sOg3vJEwuK7mMSs6wnM/Ur/TEtpTvdF36 lF/CQTdsWnCAQ== Date: Mon, 27 Apr 2026 16:08:01 -0500 From: Bjorn Helgaas To: David Matlack Cc: iommu@lists.linux.dev, kexec@lists.infradead.org, linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, linux-pci@vger.kernel.org, Adithya Jayachandran , Alexander Graf , Alex Williamson , Bjorn Helgaas , Chris Li , David Rientjes , Jacob Pan , Jason Gunthorpe , Joerg Roedel , Jonathan Corbet , Josh Hilke , Leon Romanovsky , Lukas Wunner , Mike Rapoport , Parav Pandit , Pasha Tatashin , Pranjal Shrivastava , Pratyush Yadav , Robin Murphy , Saeed Mahameed , Samiullah Khawaja , Shuah Khan , Will Deacon , William Tu , Yi Liu Subject: Re: [PATCH v4 10/11] PCI: liveupdate: Do not disable bus mastering on preserved devices during kexec Message-ID: <20260427210801.GA185338@bhelgaas> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20260423212316.3431746-11-dmatlack@google.com> X-Stat-Signature: g78qaxy7wztu4hgy7idjqdxp7x6nq7oh X-Rspamd-Server: rspam01 X-Rspamd-Queue-Id: ED5F1100002 X-Rspam-User: X-HE-Tag: 1777324082-376261 X-HE-Meta: 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 /EMVSkQK d/jpOoL+nt8nfeDRXBi0bPKxN+XAPYdcfk7qaOM+KywigZJiiCj6JT7y4HyxNMkq4Q6ym9+eiWE0yO/ri7tveIJpo47MG34eApCNK2rug1W22ck/v2bktzn6pZLFMVsvdX8uBpp46vUIMSmoPh7iFTWIu5Gciqz37yCpiXnj/A66o7iJ0J0tCoZfCmrqi/BJwmsm74gvl3w9ihKX3K4S+7QMof5XsSuvMG/Ng5OKSimpaMK35GyARo7bXqCmprf6XgfNk Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On Thu, Apr 23, 2026 at 09:23:14PM +0000, David Matlack wrote: > Do not disable bus mastering on outgoing preserved devices during > pci_device_shutdown() for kexec. > +++ b/drivers/pci/liveupdate.c > @@ -132,6 +132,10 @@ > * * The PCI core inherits ARI Forwarding Enable on all bridges with downstream > * preserved devices to ensure that all preserved devices on the bridge's > * secondary bus are addressable after the Live Update. > + * > + * * The PCI core does not disable bus mastering on outoing preserved devices > + * during kexec. This allows preserved devices to issue memory transactions s/outoing/outgoing/