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 X-Spam-Level: X-Spam-Status: No, score=-6.2 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,MAILING_LIST_MULTI,SPF_HELO_NONE, SPF_PASS autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 936CEC433DB for ; Wed, 13 Jan 2021 17:52:03 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 3F56523436 for ; Wed, 13 Jan 2021 17:52:03 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726731AbhAMRwC (ORCPT ); Wed, 13 Jan 2021 12:52:02 -0500 Received: from mail.kernel.org ([198.145.29.99]:60840 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725843AbhAMRwC (ORCPT ); Wed, 13 Jan 2021 12:52:02 -0500 Received: by mail.kernel.org (Postfix) with ESMTPSA id F1602230F9; Wed, 13 Jan 2021 17:51:21 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1610560282; bh=MXxzlmq314WXudt2hfVeTvxMIGc9fi+WWwYzwHJ/PNE=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=i/oP7hgxQAoBwtBhZN2ufX+c6gUHaqMIYLI9cqmFMv0Ey2IryBHSTwwj0+2mAEx5e rN0qtMA92F1S6zWD/1I3EwuPvF93+vF2RzZ2AKzUL5YEe6P3e1o+YzIBDyDpWIo8RN jsG9usmfhmbU7iWxdI1EFm/wk5S24yt/5w0HDlYDLQexqmIRkgCUjr37PXjbSxA093 yAsg/ILjywi7ZEHyw4wkoWgFaSc7d86gEkBNyKtGgqpJT9/cDykTgNa9EPmowtyTUL NVoZVXmpWzYbMj/QVliFeFrLcQBviM2AyyUMfHzVfg94Hp6BJHROapitpsTYUUUpF6 xYEyqVCZe8D5A== Date: Wed, 13 Jan 2021 12:51:20 -0500 From: Sasha Levin To: Matthew Rosato Cc: stable@vger.kernel.org, alex.williamson@redhat.com, cohuck@redhat.com Subject: Re: [PATCH] Request backport of a vfio patch for 5.4 stable Message-ID: <20210113175120.GU4035784@sasha-vm> References: <1610386288-26220-1-git-send-email-mjrosato@linux.ibm.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii; format=flowed Content-Disposition: inline In-Reply-To: <1610386288-26220-1-git-send-email-mjrosato@linux.ibm.com> Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org On Mon, Jan 11, 2021 at 12:31:27PM -0500, Matthew Rosato wrote: >Upstream commit 7d6e1329652e ("vfio iommu: Add dma available capability") >should probably have been identified as a stable candidate originally, as >without this available in a KVM host QEMU guests on at least s390x can >end up with broken PCI passthrough devices, as the guest is unaware of the >vfio DMA limit and can easily overrun it. > >The commit in question won't fit cleanly to 5.4, so I've included a >proposed backport patch. Queued up, thanks! -- Thanks, Sasha