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Violators will be prosecuted; (version=TLSv1/SSLv3 cipher=AES256-GCM-SHA384 bits=256/256) Mon, 6 Apr 2020 17:05:44 +0100 Received: from b06wcsmtp001.portsmouth.uk.ibm.com (b06wcsmtp001.portsmouth.uk.ibm.com [9.149.105.160]) by b06cxnps4076.portsmouth.uk.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id 036G68p213238324 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Mon, 6 Apr 2020 16:06:08 GMT Received: from b06wcsmtp001.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 2A55BA4054; Mon, 6 Apr 2020 16:06:08 +0000 (GMT) Received: from b06wcsmtp001.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id BD1EEA4060; Mon, 6 Apr 2020 16:06:07 +0000 (GMT) Received: from oc7455500831.ibm.com (unknown [9.145.23.63]) by b06wcsmtp001.portsmouth.uk.ibm.com (Postfix) with ESMTP; Mon, 6 Apr 2020 16:06:07 +0000 (GMT) Subject: Re: [PATCH v2 5/5] KVM: s390: vsie: gmap_table_walk() simplifications To: David Hildenbrand , kvm@vger.kernel.org Cc: linux-s390@vger.kernel.org, linux-kernel@vger.kernel.org, Vasily Gorbik , Heiko Carstens , Cornelia Huck , Janosch Frank References: <20200403153050.20569-1-david@redhat.com> <20200403153050.20569-6-david@redhat.com> From: Christian Borntraeger Autocrypt: addr=borntraeger@de.ibm.com; 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Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.5.0 MIME-Version: 1.0 In-Reply-To: <20200403153050.20569-6-david@redhat.com> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit X-TM-AS-GCONF: 00 x-cbid: 20040616-0020-0000-0000-000003C2BC54 X-IBM-AV-DETECTION: SAVI=unused REMOTE=unused XFE=unused x-cbparentid: 20040616-0021-0000-0000-0000221B764B Message-Id: <408c6d94-0753-7ccb-a9d8-5018a84499ee@de.ibm.com> X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:6.0.138,18.0.676 definitions=2020-04-06_08:2020-04-06,2020-04-06 signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 malwarescore=0 adultscore=0 spamscore=0 phishscore=0 lowpriorityscore=0 bulkscore=0 clxscore=1015 suspectscore=0 impostorscore=0 mlxscore=0 mlxlogscore=999 priorityscore=1501 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2003020000 definitions=main-2004060128 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 03.04.20 17:30, David Hildenbrand wrote: > Let's use asce_type where applicable. Also, simplify our sanity check for > valid table levels and convert it into a WARN_ON_ONCE(). Check if we even > have a valid gmap shadow as the very first step. > > Signed-off-by: David Hildenbrand Reviewed-by: Christian Borntraeger > --- > arch/s390/mm/gmap.c | 10 +++++----- > 1 file changed, 5 insertions(+), 5 deletions(-) > > diff --git a/arch/s390/mm/gmap.c b/arch/s390/mm/gmap.c > index 24ef30fb0833..a2bd8d7792e9 100644 > --- a/arch/s390/mm/gmap.c > +++ b/arch/s390/mm/gmap.c > @@ -788,19 +788,19 @@ static inline unsigned long *gmap_table_walk(struct gmap *gmap, > unsigned long gaddr, int level) > { > const int asce_type = gmap->asce & _ASCE_TYPE_MASK; > - unsigned long *table; > + unsigned long *table = gmap->table; > > - if ((gmap->asce & _ASCE_TYPE_MASK) + 4 < (level * 4)) > - return NULL; > if (gmap_is_shadow(gmap) && gmap->removed) > return NULL; > > + if (WARN_ON_ONCE(level > (asce_type >> 2) + 1)) > + return NULL; > + > if (WARN_ON_ONCE(asce_type != _ASCE_TYPE_REGION1 && > gaddr & (-1UL << (31 + (asce_type >> 2) * 11)))) > return NULL; > > - table = gmap->table; > - switch (gmap->asce & _ASCE_TYPE_MASK) { > + switch (asce_type) { > case _ASCE_TYPE_REGION1: > table += (gaddr & _REGION1_INDEX) >> _REGION1_SHIFT; > if (level == 4) >