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Fri, 27 Sep 2019 18:09:20 +0000 Received: from pps.filterd (userp3020.oracle.com [127.0.0.1]) by userp3020.oracle.com (8.16.0.27/8.16.0.27) with SMTP id x8RI3cV2085618; Fri, 27 Sep 2019 18:09:20 GMT Received: from aserv0122.oracle.com (aserv0122.oracle.com [141.146.126.236]) by userp3020.oracle.com with ESMTP id 2v8yk0k25p-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Fri, 27 Sep 2019 18:09:19 +0000 Received: from abhmp0015.oracle.com (abhmp0015.oracle.com [141.146.116.21]) by aserv0122.oracle.com (8.14.4/8.14.4) with ESMTP id x8RI9GBR031079; Fri, 27 Sep 2019 18:09:16 GMT Received: from bostrovs-us.us.oracle.com (/10.152.32.65) by default (Oracle Beehive Gateway v4.0) with ESMTP ; Fri, 27 Sep 2019 11:09:16 -0700 Subject: Re: [PATCH v1] xen/balloon: Set pages PageOffline() in balloon_add_region() To: David Hildenbrand , linux-kernel@vger.kernel.org Cc: linux-mm@kvack.org, xen-devel@lists.xenproject.org, =?UTF-8?Q?Marek_Marczykowski-G=c3=b3recki?= , stable@vger.kernel.org, Juergen Gross , Stefano Stabellini References: <20190927154628.8480-1-david@redhat.com> From: Boris Ostrovsky Openpgp: preference=signencrypt Autocrypt: addr=boris.ostrovsky@oracle.com; 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Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.7.0 MIME-Version: 1.0 In-Reply-To: <20190927154628.8480-1-david@redhat.com> Content-Type: text/plain; charset=utf-8 Content-Language: en-US X-Proofpoint-Virus-Version: vendor=nai engine=6000 definitions=9393 signatures=668685 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 suspectscore=0 malwarescore=0 phishscore=0 bulkscore=0 spamscore=0 mlxscore=0 mlxlogscore=999 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1908290000 definitions=main-1909270150 X-Proofpoint-Virus-Version: vendor=nai engine=6000 definitions=9393 signatures=668685 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 priorityscore=1501 malwarescore=0 suspectscore=0 phishscore=0 bulkscore=0 spamscore=0 clxscore=1011 lowpriorityscore=0 mlxscore=0 impostorscore=0 mlxlogscore=999 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1908290000 definitions=main-1909270150 Content-Transfer-Encoding: quoted-printable X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: On 9/27/19 11:46 AM, David Hildenbrand wrote: > We are missing a __SetPageOffline(), which is why we can get > !PageOffline() pages onto the balloon list, where > alloc_xenballooned_pages() will complain: > > page:ffffea0003e7ffc0 refcount:1 mapcount:0 mapping:0000000000000000 in= dex:0x0 > flags: 0xffffe00001000(reserved) > raw: 000ffffe00001000 dead000000000100 dead000000000200 000000000000000= 0 > raw: 0000000000000000 0000000000000000 00000001ffffffff 000000000000000= 0 > page dumped because: VM_BUG_ON_PAGE(!PageOffline(page)) > ------------[ cut here ]------------ > kernel BUG at include/linux/page-flags.h:744! > invalid opcode: 0000 [#1] SMP NOPTI > > Reported-by: Marek Marczykowski-G=C3=B3recki > Tested-by: Marek Marczykowski-G=C3=B3recki > Fixes: 77c4adf6a6df ("xen/balloon: mark inflated pages PG_offline") > Cc: stable@vger.kernel.org # v5.1+ > Cc: Boris Ostrovsky > Cc: Juergen Gross > Cc: Stefano Stabellini > Signed-off-by: David Hildenbrand > --- > drivers/xen/balloon.c | 1 + > 1 file changed, 1 insertion(+) > > diff --git a/drivers/xen/balloon.c b/drivers/xen/balloon.c > index 05b1f7e948ef..29f6256363db 100644 > --- a/drivers/xen/balloon.c > +++ b/drivers/xen/balloon.c > @@ -687,6 +687,7 @@ static void __init balloon_add_region(unsigned long= start_pfn, > /* totalram_pages and totalhigh_pages do not > include the boot-time balloon extension, so > don't subtract from it. */ > + __SetPageOffline(page); > __balloon_append(page); Given that when a page is appended to balloon list need to be marked offline and, conversely, when a page is retrieved the bit should be cleared I wonder whether it's better to move Set/ClearPageOffline to balloon_append/retrieve(). -boris