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[23.128.96.18]) by mx.google.com with ESMTP id y92si54657edy.117.2020.05.14.01.50.38; Thu, 14 May 2020 01:51:02 -0700 (PDT) Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) client-ip=23.128.96.18; Authentication-Results: mx.google.com; dkim=pass header.i=@redhat.com header.s=mimecast20190719 header.b=hhtNT9NZ; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=redhat.com Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726037AbgENIsg (ORCPT + 99 others); Thu, 14 May 2020 04:48:36 -0400 Received: from us-smtp-1.mimecast.com ([207.211.31.81]:55981 "EHLO us-smtp-delivery-1.mimecast.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1725977AbgENIsf (ORCPT ); Thu, 14 May 2020 04:48:35 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1589446111; h=from:from: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:content-transfer-encoding: in-reply-to:in-reply-to:references:references:autocrypt:autocrypt; bh=LQrKfZO1fcuI+nb6eAF+CfoZHKCUlkNNBNIC0Uw7KkA=; b=hhtNT9NZy+N2g6m0VRRKqDnzUdo0vuaqmuWJW5q0uZxrrHiERplyN/OZAVO9EaRqm39/8b 5VSIY2Yxt3eTgNRwKloLwku/fFvN2j7o0Rs3P9T1ZxY+iSBFZBj8caZJFl+/zydlO2gBV8 8Ys0d0S3SR01N+8Kkkc8Q/VwiG2WvmU= Received: from mimecast-mx01.redhat.com (mimecast-mx01.redhat.com [209.132.183.4]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-181-nbyB54ArPFe5JQU_X5H1dQ-1; Thu, 14 May 2020 04:48:26 -0400 X-MC-Unique: nbyB54ArPFe5JQU_X5H1dQ-1 Received: from smtp.corp.redhat.com (int-mx08.intmail.prod.int.phx2.redhat.com [10.5.11.23]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id 550008014D7; Thu, 14 May 2020 08:48:22 +0000 (UTC) Received: from [10.36.114.168] (ovpn-114-168.ams2.redhat.com [10.36.114.168]) by smtp.corp.redhat.com (Postfix) with ESMTP id C983C39E; Thu, 14 May 2020 08:48:02 +0000 (UTC) Subject: Re: [virtio-dev] [PATCH v3 00/15] virtio-mem: paravirtualized memory To: teawater Cc: LKML , Linux MM , virtio-dev@lists.oasis-open.org, Linux Virtualization , kvm@vger.kernel.org, Michal Hocko , Andrew Morton , "Michael S . Tsirkin" , Sebastien Boeuf , Samuel Ortiz , Robert Bradford , Luiz Capitulino , Pankaj Gupta , Igor Mammedov , "Dr . David Alan Gilbert" , Alexander Duyck , Alexander Potapenko , Anshuman Khandual , Anthony Yznaga , Dan Williams , Dave Young , Jason Wang , Johannes Weiner , Juergen Gross , Konrad Rzeszutek Wilk , Len Brown , Mel Gorman , Michal Hocko , Mike Rapoport , Oscar Salvador , Oscar Salvador , Pavel Tatashin , Pavel Tatashin , Pingfan Liu , Qian Cai , "Rafael J. Wysocki" , "Rafael J. Wysocki" , Stefan Hajnoczi , Vlastimil Babka , Wei Yang References: <20200507103119.11219-1-david@redhat.com> <7848642F-6AA7-4B5E-AE0E-DB0857C94A93@linux.alibaba.com> From: David Hildenbrand Autocrypt: addr=david@redhat.com; prefer-encrypt=mutual; keydata= mQINBFXLn5EBEAC+zYvAFJxCBY9Tr1xZgcESmxVNI/0ffzE/ZQOiHJl6mGkmA1R7/uUpiCjJ dBrn+lhhOYjjNefFQou6478faXE6o2AhmebqT4KiQoUQFV4R7y1KMEKoSyy8hQaK1umALTdL QZLQMzNE74ap+GDK0wnacPQFpcG1AE9RMq3aeErY5tujekBS32jfC/7AnH7I0v1v1TbbK3Gp XNeiN4QroO+5qaSr0ID2sz5jtBLRb15RMre27E1ImpaIv2Jw8NJgW0k/D1RyKCwaTsgRdwuK Kx/Y91XuSBdz0uOyU/S8kM1+ag0wvsGlpBVxRR/xw/E8M7TEwuCZQArqqTCmkG6HGcXFT0V9 PXFNNgV5jXMQRwU0O/ztJIQqsE5LsUomE//bLwzj9IVsaQpKDqW6TAPjcdBDPLHvriq7kGjt WhVhdl0qEYB8lkBEU7V2Yb+SYhmhpDrti9Fq1EsmhiHSkxJcGREoMK/63r9WLZYI3+4W2rAc UucZa4OT27U5ZISjNg3Ev0rxU5UH2/pT4wJCfxwocmqaRr6UYmrtZmND89X0KigoFD/XSeVv jwBRNjPAubK9/k5NoRrYqztM9W6sJqrH8+UWZ1Idd/DdmogJh0gNC0+N42Za9yBRURfIdKSb B3JfpUqcWwE7vUaYrHG1nw54pLUoPG6sAA7Mehl3nd4pZUALHwARAQABtCREYXZpZCBIaWxk ZW5icmFuZCA8ZGF2aWRAcmVkaGF0LmNvbT6JAlgEEwEIAEICGwMFCQlmAYAGCwkIBwMCBhUI AgkKCwQWAgMBAh4BAheAFiEEG9nKrXNcTDpGDfzKTd4Q9wD/g1oFAl3pImkCGQEACgkQTd4Q 9wD/g1o+VA//SFvIHUAvul05u6wKv/pIR6aICPdpF9EIgEU448g+7FfDgQwcEny1pbEzAmiw zAXIQ9H0NZh96lcq+yDLtONnXk/bEYWHHUA014A1wqcYNRY8RvY1+eVHb0uu0KYQoXkzvu+s Dncuguk470XPnscL27hs8PgOP6QjG4jt75K2LfZ0eAqTOUCZTJxA8A7E9+XTYuU0hs7QVrWJ jQdFxQbRMrYz7uP8KmTK9/Cnvqehgl4EzyRaZppshruKMeyheBgvgJd5On1wWq4ZUV5PFM4x II3QbD3EJfWbaJMR55jI9dMFa+vK7MFz3rhWOkEx/QR959lfdRSTXdxs8V3zDvChcmRVGN8U Vo93d1YNtWnA9w6oCW1dnDZ4kgQZZSBIjp6iHcA08apzh7DPi08jL7M9UQByeYGr8KuR4i6e RZI6xhlZerUScVzn35ONwOC91VdYiQgjemiVLq1WDDZ3B7DIzUZ4RQTOaIWdtXBWb8zWakt/ ztGhsx0e39Gvt3391O1PgcA7ilhvqrBPemJrlb9xSPPRbaNAW39P8ws/UJnzSJqnHMVxbRZC Am4add/SM+OCP0w3xYss1jy9T+XdZa0lhUvJfLy7tNcjVG/sxkBXOaSC24MFPuwnoC9WvCVQ ZBxouph3kqc4Dt5X1EeXVLeba+466P1fe1rC8MbcwDkoUo65Ag0EVcufkQEQAOfX3n0g0fZz Bgm/S2zF/kxQKCEKP8ID+Vz8sy2GpDvveBq4H2Y34XWsT1zLJdvqPI4af4ZSMxuerWjXbVWb T6d4odQIG0fKx4F8NccDqbgHeZRNajXeeJ3R7gAzvWvQNLz4piHrO/B4tf8svmRBL0ZB5P5A 2uhdwLU3NZuK22zpNn4is87BPWF8HhY0L5fafgDMOqnf4guJVJPYNPhUFzXUbPqOKOkL8ojk CXxkOFHAbjstSK5Ca3fKquY3rdX3DNo+EL7FvAiw1mUtS+5GeYE+RMnDCsVFm/C7kY8c2d0G NWkB9pJM5+mnIoFNxy7YBcldYATVeOHoY4LyaUWNnAvFYWp08dHWfZo9WCiJMuTfgtH9tc75 7QanMVdPt6fDK8UUXIBLQ2TWr/sQKE9xtFuEmoQGlE1l6bGaDnnMLcYu+Asp3kDT0w4zYGsx 5r6XQVRH4+5N6eHZiaeYtFOujp5n+pjBaQK7wUUjDilPQ5QMzIuCL4YjVoylWiBNknvQWBXS lQCWmavOT9sttGQXdPCC5ynI+1ymZC1ORZKANLnRAb0NH/UCzcsstw2TAkFnMEbo9Zu9w7Kv AxBQXWeXhJI9XQssfrf4Gusdqx8nPEpfOqCtbbwJMATbHyqLt7/oz/5deGuwxgb65pWIzufa N7eop7uh+6bezi+rugUI+w6DABEBAAGJAiUEGAECAA8FAlXLn5ECGwwFCQlmAYAACgkQTd4Q 9wD/g1qA6w/+M+ggFv+JdVsz5+ZIc6MSyGUozASX+bmIuPeIecc9UsFRatc91LuJCKMkD9Uv GOcWSeFpLrSGRQ1Z7EMzFVU//qVs6uzhsNk0RYMyS0B6oloW3FpyQ+zOVylFWQCzoyyf227y GW8HnXunJSC+4PtlL2AY4yZjAVAPLK2l6mhgClVXTQ/S7cBoTQKP+jvVJOoYkpnFxWE9pn4t H5QIFk7Ip8TKr5k3fXVWk4lnUi9MTF/5L/mWqdyIO1s7cjharQCstfWCzWrVeVctpVoDfJWp 4LwTuQ5yEM2KcPeElLg5fR7WB2zH97oI6/Ko2DlovmfQqXh9xWozQt0iGy5tWzh6I0JrlcxJ ileZWLccC4XKD1037Hy2FLAjzfoWgwBLA6ULu0exOOdIa58H4PsXtkFPrUF980EEibUp0zFz GotRVekFAceUaRvAj7dh76cToeZkfsjAvBVb4COXuhgX6N4pofgNkW2AtgYu1nUsPAo+NftU CxrhjHtLn4QEBpkbErnXQyMjHpIatlYGutVMS91XTQXYydCh5crMPs7hYVsvnmGHIaB9ZMfB njnuI31KBiLUks+paRkHQlFcgS2N3gkRBzH7xSZ+t7Re3jvXdXEzKBbQ+dC3lpJB0wPnyMcX FOTT3aZT7IgePkt5iC/BKBk3hqKteTnJFeVIT7EC+a6YUFg= Organization: Red Hat GmbH Message-ID: <31c5d2f9-c104-53e8-d9c8-cb45f7507c85@redhat.com> Date: Thu, 14 May 2020 10:48:01 +0200 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.7.0 MIME-Version: 1.0 In-Reply-To: <7848642F-6AA7-4B5E-AE0E-DB0857C94A93@linux.alibaba.com> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 8bit X-Scanned-By: MIMEDefang 2.84 on 10.5.11.23 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 14.05.20 08:44, teawater wrote: > Hi David, > > I got a kernel warning with v2 and v3. Hi Hui, thanks for playing with the latest versions. Surprisingly, I can reproduce even by hotplugging a DIMM instead as well - that's good, so it's not related to virtio-mem, lol. Seems to be some QEMU setup issue with older machine types. Can you switch to a newer qemu machine version, especially pc-i440fx-5.0? Both, hotplugging DIMMs and virtio-mem works for me with that QEMU machine just fine. What also seems to make it work with pc-i440fx-2.1, is giving the machine 4G of initial memory (-m 4g,slots=10,maxmem=5G). Cheers! > // start a QEMU that is get from https://github.com/davidhildenbrand/qemu/tree/virtio-mem-v2 and setup a file as a ide disk. > /home/teawater/qemu/qemu/x86_64-softmmu/qemu-system-x86_64 -machine pc-i440fx-2.1,accel=kvm,usb=off -cpu host -no-reboot -nographic -device ide-hd,drive=hd -drive if=none,id=hd,file=/home/teawater/old.img,format=raw -kernel /home/teawater/kernel/bk2/arch/x86/boot/bzImage -append "console=ttyS0 root=/dev/sda nokaslr swiotlb=noforce" -m 1g,slots=10,maxmem=2G -smp 1 -s -monitor unix:/home/teawater/qemu/m,server,nowait > > // Setup virtio-mem and plug 256m memory in qemu monitor: > object_add memory-backend-ram,id=mem1,size=256m > device_add virtio-mem-pci,id=vm0,memdev=mem1 > qom-set vm0 requested-size 256M > > // Go back to the terminal and access file system will got following kernel warning. > [ 19.515549] pci 0000:00:04.0: [1af4:1015] type 00 class 0x00ff00 > [ 19.516227] pci 0000:00:04.0: reg 0x10: [io 0x0000-0x007f] > [ 19.517196] pci 0000:00:04.0: BAR 0: assigned [io 0x1000-0x107f] > [ 19.517843] virtio-pci 0000:00:04.0: enabling device (0000 -> 0001) > [ 19.535957] PCI Interrupt Link [LNKD] enabled at IRQ 11 > [ 19.536507] virtio-pci 0000:00:04.0: virtio_pci: leaving for legacy driver > [ 19.537528] virtio_mem virtio0: start address: 0x100000000 > [ 19.538094] virtio_mem virtio0: region size: 0x10000000 > [ 19.538621] virtio_mem virtio0: device block size: 0x200000 > [ 19.539186] virtio_mem virtio0: memory block size: 0x8000000 > [ 19.539752] virtio_mem virtio0: subblock size: 0x400000 > [ 19.540357] virtio_mem virtio0: plugged size: 0x0 > [ 19.540834] virtio_mem virtio0: requested size: 0x0 > [ 20.170441] virtio_mem virtio0: plugged size: 0x0 > [ 20.170933] virtio_mem virtio0: requested size: 0x10000000 > [ 20.172247] Built 1 zonelists, mobility grouping on. Total pages: 266012 > [ 20.172955] Policy zone: Normal > > / # ls > [ 26.724565] ------------[ cut here ]------------ > [ 26.725047] ata_piix 0000:00:01.1: DMA addr 0x000000010fc14000+49152 overflow (mask ffffffff, bus limit 0). > [ 26.726024] WARNING: CPU: 0 PID: 179 at /home/teawater/kernel/linux2/kernel/dma/direct.c:364 dma_direct_map_page+0x118/0x130 > [ 26.727141] Modules linked in: > [ 26.727456] CPU: 0 PID: 179 Comm: ls Not tainted 5.6.0-rc5-next-20200311+ #9 > [ 26.728163] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.13.0-0-gf21b5a4aeb02-prebuilt.qemu.org 04/01/2014 > [ 26.729305] RIP: 0010:dma_direct_map_page+0x118/0x130 > [ 26.729825] Code: 8b 1f e8 3b 70 59 00 48 8d 4c 24 08 48 89 c6 4c 89 2c 24 4d 89 e1 49 89 e8 48 89 da 48 c7 c7 08 6c 34 82 31 c0 e8 d8 8e f7 ff <00 > [ 26.731683] RSP: 0000:ffffc90000213838 EFLAGS: 00010082 > [ 26.732205] RAX: 0000000000000000 RBX: ffff88803ebeb1b0 RCX: ffffffff82665148 > [ 26.732913] RDX: 0000000000000001 RSI: 0000000000000092 RDI: 0000000000000046 > [ 26.733621] RBP: 000000000000c000 R08: 00000000000001df R09: 00000000000001df > [ 26.734338] R10: 0000000000000000 R11: ffffc900002135a8 R12: 00000000ffffffff > [ 26.735054] R13: 0000000000000000 R14: 0000000000000000 R15: ffff88803d55f5b0 > [ 26.735772] FS: 00000000024e9880(0000) GS:ffff88803ec00000(0000) knlGS:0000000000000000 > [ 26.736579] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 > [ 26.737162] CR2: 00000000005bfc7f CR3: 0000000107e12004 CR4: 0000000000360ef0 > [ 26.737879] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 > [ 26.738591] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 > [ 26.739307] Call Trace: > [ 26.739564] dma_direct_map_sg+0x64/0xb0 > [ 26.739969] ? ata_scsi_write_same_xlat+0x350/0x350 > [ 26.740461] ata_qc_issue+0x214/0x260 > [ 26.740839] ata_scsi_queuecmd+0x16a/0x490 > [ 26.741255] scsi_queue_rq+0x679/0xa60 > [ 26.741639] blk_mq_dispatch_rq_list+0x90/0x510 > [ 26.742099] ? elv_rb_del+0x1f/0x30 > [ 26.742456] ? deadline_remove_request+0x6a/0xb0 > [ 26.742926] blk_mq_do_dispatch_sched+0x78/0x100 > [ 26.743397] blk_mq_sched_dispatch_requests+0xf9/0x170 > [ 26.743924] __blk_mq_run_hw_queue+0x7e/0x130 > [ 26.744365] __blk_mq_delay_run_hw_queue+0x107/0x150 > [ 26.744874] blk_mq_run_hw_queue+0x61/0x100 > [ 26.745299] blk_mq_sched_insert_requests+0x71/0x110 > [ 26.745798] blk_mq_flush_plug_list+0x14b/0x210 > [ 26.746258] blk_flush_plug_list+0xbf/0xe0 > [ 26.746675] blk_finish_plug+0x27/0x40 > [ 26.747056] read_pages+0x7c/0x190 > [ 26.747399] __do_page_cache_readahead+0x19c/0x1b0 > [ 26.747886] filemap_fault+0x54e/0x9a0 > [ 26.748268] ? alloc_set_pte+0x102/0x610 > [ 26.748673] ? walk_component+0x64/0x2e0 > [ 26.749072] ? filemap_map_pages+0xfa/0x3f0 > [ 26.749498] ext4_filemap_fault+0x2c/0x3b > [ 26.749911] __do_fault+0x38/0xb0 > [ 26.750251] __handle_mm_fault+0xd2a/0x16d0 > [ 26.750678] handle_mm_fault+0xe2/0x1f0 > [ 26.751069] do_page_fault+0x250/0x590 > [ 26.751448] async_page_fault+0x34/0x40 > [ 26.751841] RIP: 0033:0x5bfc7f > [ 26.752155] Code: Bad RIP value. > [ 26.752481] RSP: 002b:00007ffef0289cd8 EFLAGS: 00010246 > [ 26.752999] RAX: 0000000000000001 RBX: 00007ffef028af81 RCX: 00007ffef028af84 > [ 26.753715] RDX: 00007ffef0289e01 RSI: 00007ffef0289ea8 RDI: 0000000000000001 > [ 26.754424] RBP: 00000000000000ac R08: 0000000000000001 R09: 0000000000000006 > [ 26.755144] R10: 000000000089fc18 R11: 0000000000000246 R12: 00007ffef0289ea8 > [ 26.755853] R13: 000000000043a5f0 R14: 0000000000000000 R15: 0000000000000000 > [ 26.756560] ---[ end trace 23cc3e9021358587 ]--- > [ 26.778034] ata2.00: exception Emask 0x0 SAct 0x0 SErr 0x0 action 0x0 > [ 26.778690] ata2.00: failed command: READ DMA > [ 26.779131] ata2.00: cmd c8/00:e8:92:ad:00/00:00:00:00:00/e0 tag 0 dma 118784 in > [ 26.779131] res 50/00:00:0a:80:03/00:00:00:00:00/a0 Emask 0x40 (internal error) > [ 26.780691] ata2.00: status: { DRDY } > [ 26.781603] ata2.00: configured for MWDMA2 > [ 26.782034] sd 1:0:0:0: [sda] tag#0 FAILED Result: hostbyte=DID_OK driverbyte=DRIVER_SENSE cmd_age=0s > [ 26.782958] sd 1:0:0:0: [sda] tag#0 Sense Key : Illegal Request [current] > [ 26.783646] sd 1:0:0:0: [sda] tag#0 Add. Sense: Unaligned write command > [ 26.784321] sd 1:0:0:0: [sda] tag#0 CDB: Read(10) 28 00 00 00 ad 92 00 00 e8 00 > [ 26.785056] blk_update_request: I/O error, dev sda, sector 44434 op 0x0:(READ) flags 0x80700 phys_seg 3 prio class 0 > [ 26.786118] ata2: EH complete > [ 26.810033] ata2.00: exception Emask 0x0 SAct 0x0 SErr 0x0 action 0x0 > [ 26.810690] ata2.00: failed command: READ DMA > [ 26.811133] ata2.00: cmd c8/00:08:fa:ad:00/00:00:00:00:00/e0 tag 0 dma 4096 in > [ 26.811133] res 50/00:00:00:00:00/00:00:00:00:00/a0 Emask 0x40 (internal error) > [ 26.812681] ata2.00: status: { DRDY } > [ 26.813569] ata2.00: configured for MWDMA2 > [ 26.813992] ata2: EH complete > [ 26.826031] ata2.00: exception Emask 0x0 SAct 0x0 SErr 0x0 action 0x0 > [ 26.826687] ata2.00: failed command: READ DMA > [ 26.827131] ata2.00: cmd c8/00:08:fa:ad:00/00:00:00:00:00/e0 tag 0 dma 4096 in > [ 26.827131] res 50/00:00:00:00:00/00:00:00:00:00/a0 Emask 0x40 (internal error) > [ 26.828668] ata2.00: status: { DRDY } > [ 26.829552] ata2.00: configured for MWDMA2 > [ 26.829972] ata2: EH complete > [ 26.842030] ata2.00: exception Emask 0x0 SAct 0x0 SErr 0x0 action 0x0 > [ 26.842686] ata2.00: failed command: READ DMA > [ 26.843127] ata2.00: cmd c8/00:08:fa:ad:00/00:00:00:00:00/e0 tag 0 dma 4096 in > [ 26.843127] res 50/00:00:00:00:00/00:00:00:00:00/a0 Emask 0x40 (internal error) > [ 26.844656] ata2.00: status: { DRDY } > [ 26.845538] ata2.00: configured for MWDMA2 > [ 26.845961] ata2: EH complete > [ 26.858030] ata2.00: exception Emask 0x0 SAct 0x0 SErr 0x0 action 0x0 > [ 26.858690] ata2.00: failed command: READ DMA > [ 26.859132] ata2.00: cmd c8/00:08:fa:ad:00/00:00:00:00:00/e0 tag 0 dma 4096 in > [ 26.859132] res 50/00:00:00:00:00/00:00:00:00:00/a0 Emask 0x40 (internal error) > [ 26.860656] ata2.00: status: { DRDY } > [ 26.861542] ata2.00: configured for MWDMA2 > [ 26.861960] ata2: EH complete > [ 26.874030] ata2.00: exception Emask 0x0 SAct 0x0 SErr 0x0 action 0x0 > [ 26.874693] ata2.00: failed command: READ DMA > [ 26.875131] ata2.00: cmd c8/00:08:fa:ad:00/00:00:00:00:00/e0 tag 0 dma 4096 in > [ 26.875131] res 50/00:00:00:00:00/00:00:00:00:00/a0 Emask 0x40 (internal error) > [ 26.876675] ata2.00: status: { DRDY } > [ 26.877554] ata2.00: configured for MWDMA2 > [ 26.877976] ata2: EH complete > [ 26.890030] ata2.00: exception Emask 0x0 SAct 0x0 SErr 0x0 action 0x0 > [ 26.890655] ata2.00: failed command: READ DMA > [ 26.891082] ata2.00: cmd c8/00:08:fa:ad:00/00:00:00:00:00/e0 tag 0 dma 4096 in > [ 26.891082] res 50/00:00:00:00:00/00:00:00:00:00/a0 Emask 0x40 (internal error) > [ 26.892544] ata2.00: status: { DRDY } > [ 26.893408] ata2.00: configured for MWDMA2 > [ 26.893812] sd 1:0:0:0: [sda] tag#0 FAILED Result: hostbyte=DID_OK driverbyte=DRIVER_SENSE cmd_age=0s > [ 26.894698] sd 1:0:0:0: [sda] tag#0 Sense Key : Illegal Request [current] > [ 26.895356] sd 1:0:0:0: [sda] tag#0 Add. Sense: Unaligned write command > [ 26.895993] sd 1:0:0:0: [sda] tag#0 CDB: Read(10) 28 00 00 00 ad fa 00 00 08 00 > [ 26.896693] blk_update_request: I/O error, dev sda, sector 44538 op 0x0:(READ) flags 0x0 phys_seg 1 prio class 0 > [ 26.897668] ata2: EH complete > [ 26.922032] ata2.00: exception Emask 0x0 SAct 0x0 SErr 0x0 action 0x0 > [ 26.922652] ata2.00: failed command: READ DMA > [ 26.923080] ata2.00: cmd c8/00:08:fa:ad:00/00:00:00:00:00/e0 tag 0 dma 4096 in > [ 26.923080] res 50/00:00:00:00:00/00:00:00:00:00/a0 Emask 0x40 (internal error) > [ 26.924538] ata2.00: status: { DRDY } > [ 26.925404] ata2.00: configured for MWDMA2 > [ 26.925807] ata2: EH complete > [ 26.938031] ata2.00: exception Emask 0x0 SAct 0x0 SErr 0x0 action 0x0 > [ 26.938650] ata2.00: failed command: READ DMA > [ 26.939076] ata2.00: cmd c8/00:08:fa:ad:00/00:00:00:00:00/e0 tag 0 dma 4096 in > [ 26.939076] res 50/00:00:00:00:00/00:00:00:00:00/a0 Emask 0x40 (internal error) > [ 26.940529] ata2.00: status: { DRDY } > [ 26.941391] ata2.00: configured for MWDMA2 > [ 26.941793] ata2: EH complete > [ 26.954031] ata2.00: exception Emask 0x0 SAct 0x0 SErr 0x0 action 0x0 > [ 26.954652] ata2.00: failed command: READ DMA > [ 26.955079] ata2.00: cmd c8/00:08:fa:ad:00/00:00:00:00:00/e0 tag 0 dma 4096 in > [ 26.955079] res 50/00:00:00:00:00/00:00:00:00:00/a0 Emask 0x40 (internal error) > [ 26.956536] ata2.00: status: { DRDY } > [ 26.957400] ata2.00: configured for MWDMA2 > [ 26.957800] ata2: EH complete > [ 26.970031] ata2.00: exception Emask 0x0 SAct 0x0 SErr 0x0 action 0x0 > [ 26.970653] ata2.00: failed command: READ DMA > [ 26.971079] ata2.00: cmd c8/00:08:fa:ad:00/00:00:00:00:00/e0 tag 0 dma 4096 in > [ 26.971079] res 50/00:00:00:00:00/00:00:00:00:00/a0 Emask 0x40 (internal error) > [ 26.972536] ata2.00: status: { DRDY } > [ 26.973402] ata2.00: configured for MWDMA2 > [ 26.973804] ata2: EH complete > [ 26.986030] ata2.00: exception Emask 0x0 SAct 0x0 SErr 0x0 action 0x0 > [ 26.986654] ata2.00: failed command: READ DMA > [ 26.987082] ata2.00: cmd c8/00:08:fa:ad:00/00:00:00:00:00/e0 tag 0 dma 4096 in > [ 26.987082] res 50/00:00:00:00:00/00:00:00:00:00/a0 Emask 0x40 (internal error) > [ 26.988541] ata2.00: status: { DRDY } > [ 26.989406] ata2.00: configured for MWDMA2 > [ 26.989807] ata2: EH complete > [ 27.002031] ata2.00: exception Emask 0x0 SAct 0x0 SErr 0x0 action 0x0 > [ 27.002653] ata2.00: failed command: READ DMA > [ 27.003083] ata2.00: cmd c8/00:08:fa:ad:00/00:00:00:00:00/e0 tag 0 dma 4096 in > [ 27.003083] res 50/00:00:00:00:00/00:00:00:00:00/a0 Emask 0x40 (internal error) > [ 27.004541] ata2.00: status: { DRDY } > [ 27.005404] ata2.00: configured for MWDMA2 > [ 27.005806] sd 1:0:0:0: [sda] tag#0 FAILED Result: hostbyte=DID_OK driverbyte=DRIVER_SENSE cmd_age=0s > [ 27.006688] sd 1:0:0:0: [sda] tag#0 Sense Key : Illegal Request [current] > [ 27.007346] sd 1:0:0:0: [sda] tag#0 Add. Sense: Unaligned write command > [ 27.007982] sd 1:0:0:0: [sda] tag#0 CDB: Read(10) 28 00 00 00 ad fa 00 00 08 00 > [ 27.008680] blk_update_request: I/O error, dev sda, sector 44538 op 0x0:(READ) flags 0x0 phys_seg 1 prio class 0 > [ 27.009649] ata2: EH complete > Bus error > > I cannot reproduce this warning with set file as nvdimm with following command. > sudo /home/teawater/qemu/qemu/x86_64-softmmu/qemu-system-x86_64 -machine pc,accel=kvm,kernel_irqchip,nvdimm -no-reboot -nographic -kernel /home/teawater/kernel/bk2/arch/x86/boot/bzImage -append "console=ttyS0 root=/dev/pmem0 swiotlb=noforce" -m 1g,slots=1,maxmem=2G -smp 1 -device nvdimm,id=nv0,memdev=mem0 -object memory-backend-file,id=mem0,mem-path=/home/teawater/old.img,size=268435456 -monitor unix:/home/teawater/qemu/m,server,nowait > > Best, > Hui -- Thanks, David / dhildenb