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Violators will be prosecuted; (version=TLSv1/SSLv3 cipher=AES256-GCM-SHA384 bits=256/256) Fri, 13 Mar 2020 07:38:46 -0000 Received: from b06wcsmtp001.portsmouth.uk.ibm.com (b06wcsmtp001.portsmouth.uk.ibm.com [9.149.105.160]) by b06avi18878370.portsmouth.uk.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id 02D7cjqb39846212 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Fri, 13 Mar 2020 07:38:45 GMT Received: from b06wcsmtp001.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 3EA3EA405C; Fri, 13 Mar 2020 07:38:45 +0000 (GMT) Received: from b06wcsmtp001.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id B1236A4064; Fri, 13 Mar 2020 07:38:44 +0000 (GMT) Received: from oc7455500831.ibm.com (unknown [9.152.224.119]) by b06wcsmtp001.portsmouth.uk.ibm.com (Postfix) with ESMTP; Fri, 13 Mar 2020 07:38:44 +0000 (GMT) Subject: Re: [PATCH v9 11/15] s390x: protvirt: Disable address checks for PV guest IO emulation To: Janosch Frank , qemu-devel@nongnu.org References: <20200311132151.172389-1-frankja@linux.ibm.com> <20200311132151.172389-12-frankja@linux.ibm.com> <46eb4e3f-6dac-c26c-d757-90696c0b095c@linux.ibm.com> <551d414a-419d-6422-1b9b-7fd51b0e9877@de.ibm.com> <3c2ced8e-e429-9be1-9067-faf248d0a2b2@linux.ibm.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: <3c2ced8e-e429-9be1-9067-faf248d0a2b2@linux.ibm.com> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit X-TM-AS-GCONF: 00 x-cbid: 20031307-0028-0000-0000-000003E409E6 X-IBM-AV-DETECTION: SAVI=unused REMOTE=unused XFE=unused x-cbparentid: 20031307-0029-0000-0000-000024A9541E Message-Id: <34555d04-170d-2ae7-7f32-143c5e328917@de.ibm.com> X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:6.0.138, 18.0.572 definitions=2020-03-13_02:2020-03-11, 2020-03-13 signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 malwarescore=0 impostorscore=0 clxscore=1015 phishscore=0 adultscore=0 spamscore=0 bulkscore=0 mlxlogscore=999 mlxscore=0 priorityscore=1501 suspectscore=0 lowpriorityscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2003020000 definitions=main-2003130039 X-detected-operating-system: by eggs.gnu.org: GNU/Linux 3.x [generic] X-Received-From: 148.163.158.5 X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: qemu-s390x@nongnu.org, cohuck@redhat.com, david@redhat.com Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" On 12.03.20 17:17, Janosch Frank wrote: > On 3/12/20 5:10 PM, Christian Borntraeger wrote: >> >> >> On 12.03.20 17:07, Janosch Frank wrote: >>> On 3/12/20 4:41 PM, Christian Borntraeger wrote: >>>> On 11.03.20 14:21, Janosch Frank wrote: >>>>> IO instruction data is routed through SIDAD for protected guests, so >>>>> adresses do not need to be checked, as this is kernel memory. >>>> >>>> Maybe also mention that the data structures for the I/O instrutions >>>> start at offset 0 of the SIDA? >>> >>> You mean in the comment for get_address_from_regs() or in the commit >>> message? It would certainly make sense for get_address_from_regs(). >> >> Maybe both? >> > > This is what I have now: > > s390x: protvirt: Disable address checks for PV guest IO emulation > > IO instruction data is routed through SIDAD for protected guests, so > adresses do not need to be checked, as this is kernel memory which is > always available. > > Also the instruction data always starts at offset 0 of the SIDAD. > > Signed-off-by: Janosch Frank > Reviewed-by: Thomas Huth > Reviewed-by: David Hildenbrand > Reviewed-by: Christian Borntraeger > > and > > + /* > > > + * Addresses for protected guests are all offsets into the > > > + * satellite block which holds the IO control structures. Those > > > + * control structures are always starting at offset 0 and are > > > + * always aligned and accessible. So we can return 0 here which > > > + * will pass the following address checks. > > > + */ > Looks perfect without the empty lines.