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=-4.0 required=3.0 tests=BAYES_00,MAILING_LIST_MULTI, SPF_HELO_NONE 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 3D733C47083 for ; Fri, 4 Jun 2021 13:00:19 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 277FD6115B for ; Fri, 4 Jun 2021 13:00:19 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230265AbhFDNCE (ORCPT ); Fri, 4 Jun 2021 09:02:04 -0400 Received: from mail-wm1-f53.google.com ([209.85.128.53]:54850 "EHLO mail-wm1-f53.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230262AbhFDNCE (ORCPT ); Fri, 4 Jun 2021 09:02:04 -0400 Received: by mail-wm1-f53.google.com with SMTP id o127so5326692wmo.4; Fri, 04 Jun 2021 06:00:17 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:date:from:to:cc:subject:message-id:references :mime-version:content-disposition:in-reply-to; bh=sDvJ/P2CUwJS1UkHCdeZqkrV0wm/XZF87IhduHAN14A=; b=RBZor5KCG8k2VxOdSGGG9oZprsdpa1FM2ESJtcoGlzZ4+5gtOfai2nIJq53rC9fVeu MT8vCFA6UcRwM9GHwH4OMFDn69MkuOMbijBVJQ9Anwno027rhC1r4u4pUdGjwPrNyPPD e2NIEIGJ8N2dT2GuUooHVz4t3GV5joIZJGsuZZFkK3u/Mi0iaXNIWKDn8K5RAr63adQD T/Wryi/9NzI3l/p7L+5cSiVPBW+K5e1CbLGS7kzWiRynnn9/Io/fV2pPqDgxeS80T5bX sc3ZAH6xs7zO4vPc4lVXT0POnhkAVc46KxCN8J7KmCVBcneMKXkrsnKPgXDDX3cVbid/ s3Gw== X-Gm-Message-State: AOAM531ihE+767OX+yZsFtb5LZMloKDyU8lJzbEtD+jQYJpzGXHokwAN NcooDc4xjqSQYckrEudmBSOdJgvfXIw= X-Google-Smtp-Source: ABdhPJyFEW9QabvckxrTXanJXK76Qm2nxTXcxOzdGCgtNeZIbg7MFr6vkW9qMHfgph8dhTL8s9wXuQ== X-Received: by 2002:a7b:c7cd:: with SMTP id z13mr3476024wmk.54.1622811617069; Fri, 04 Jun 2021 06:00:17 -0700 (PDT) Received: from liuwe-devbox-debian-v2 ([51.145.34.42]) by smtp.gmail.com with ESMTPSA id f14sm6499240wry.40.2021.06.04.06.00.16 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 04 Jun 2021 06:00:16 -0700 (PDT) Date: Fri, 4 Jun 2021 13:00:14 +0000 From: Wei Liu To: Vitaly Kuznetsov Cc: Matthew Wilcox , dri-devel@lists.freedesktop.org, linux-hyperv@vger.kernel.org, linux-fbdev@vger.kernel.org, linux-kernel@vger.kernel.org, Michael Kelley , wei.liu@kernel.org, Dexuan Cui , viremana@linux.microsoft.com Subject: Re: [bug report] Commit ccf953d8f3d6 ("fb_defio: Remove custom address_space_operations") breaks Hyper-V FB driver Message-ID: <20210604130014.tkeozyn4wxdsr6o2@liuwe-devbox-debian-v2> References: <87v96tzujm.fsf@vitty.brq.redhat.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <87v96tzujm.fsf@vitty.brq.redhat.com> Precedence: bulk List-ID: X-Mailing-List: linux-hyperv@vger.kernel.org On Fri, Jun 04, 2021 at 02:25:01PM +0200, Vitaly Kuznetsov wrote: > Hi, > > Commit ccf953d8f3d6 ("fb_defio: Remove custom address_space_operations") > seems to be breaking Hyper-V framebuffer > (drivers/video/fbdev/hyperv_fb.c) driver for me: Hyper-V guest boots > well and plymouth even works but when I try starting Gnome, virtual > screen just goes black. Reverting the above mentioned commit on top of > 5.13-rc4 saves the day. The behavior is 100% reproducible. I'm using > Gen2 guest runing on Hyper-V 2019. It was also reported that Gen1 guests > are equally broken. > > Is this something known? > I've heard a similar report from Vineeth but we didn't get to the bottom of this. Wei. > -- > Vitaly >