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Violators will be prosecuted; (version=TLSv1/SSLv3 cipher=AES256-GCM-SHA384 bits=256/256) Thu, 5 Mar 2020 11:26:23 -0000 Received: from d06av22.portsmouth.uk.ibm.com (d06av22.portsmouth.uk.ibm.com [9.149.105.58]) by b06cxnps3075.portsmouth.uk.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id 025BQMxO42926252 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Thu, 5 Mar 2020 11:26:22 GMT Received: from d06av22.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 403184C044; Thu, 5 Mar 2020 11:26:22 +0000 (GMT) Received: from d06av22.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 1487C4C04A; Thu, 5 Mar 2020 11:26:22 +0000 (GMT) Received: from dyn-9-152-224-184.boeblingen.de.ibm.com (unknown [9.152.224.184]) by d06av22.portsmouth.uk.ibm.com (Postfix) with ESMTP; Thu, 5 Mar 2020 11:26:22 +0000 (GMT) Subject: Re: [PATCH v6 13/18] s390x: protvirt: Disable address checks for PV guest IO emulation To: David Hildenbrand , qemu-devel@nongnu.org References: <20200304114231.23493-1-frankja@linux.ibm.com> <20200304114231.23493-14-frankja@linux.ibm.com> <36715573-98c2-311c-03a8-300e6b4915a3@redhat.com> From: Janosch Frank Autocrypt: addr=frankja@linux.ibm.com; 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Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.2.2 MIME-Version: 1.0 In-Reply-To: Content-Type: multipart/signed; micalg=pgp-sha256; protocol="application/pgp-signature"; boundary="JMRRFLgkmFphkygfe9hj9hnbkwVopsBEs" X-TM-AS-GCONF: 00 x-cbid: 20030511-0020-0000-0000-000003B0B982 X-IBM-AV-DETECTION: SAVI=unused REMOTE=unused XFE=unused x-cbparentid: 20030511-0021-0000-0000-00002208F496 Message-Id: X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:6.0.138, 18.0.572 definitions=2020-03-05_03:2020-03-05, 2020-03-05 signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 malwarescore=0 clxscore=1015 mlxscore=0 phishscore=0 mlxlogscore=999 suspectscore=3 lowpriorityscore=0 impostorscore=0 bulkscore=0 spamscore=0 adultscore=0 priorityscore=1501 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2001150001 definitions=main-2003050073 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: borntraeger@de.ibm.com, qemu-s390x@nongnu.org, cohuck@redhat.com Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" This is an OpenPGP/MIME signed message (RFC 4880 and 3156) --JMRRFLgkmFphkygfe9hj9hnbkwVopsBEs Content-Type: multipart/mixed; boundary="NNSvzJxyIyPgoZK3xR84wmeowjIzgCnCm" --NNSvzJxyIyPgoZK3xR84wmeowjIzgCnCm Content-Type: text/plain; charset=windows-1252 Content-Language: en-US Content-Transfer-Encoding: quoted-printable On 3/5/20 11:00 AM, David Hildenbrand wrote: > On 05.03.20 10:42, Janosch Frank wrote: >> On 3/4/20 6:55 PM, David Hildenbrand wrote: >>> On 04.03.20 12:42, 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. >>>> >>>> Signed-off-by: Janosch Frank >>>> Reviewed-by: Thomas Huth >>>> --- >>>> target/s390x/ioinst.c | 26 +++++++++++++++++++------- >>>> 1 file changed, 19 insertions(+), 7 deletions(-) >>>> >>>> diff --git a/target/s390x/ioinst.c b/target/s390x/ioinst.c >>>> index c437a1d8c6..e4102430aa 100644 >>>> --- a/target/s390x/ioinst.c >>>> +++ b/target/s390x/ioinst.c >>>> @@ -17,6 +17,16 @@ >>>> #include "trace.h" >>>> #include "hw/s390x/s390-pci-bus.h" >>>> =20 >>>> +static uint64_t get_address_from_regs(CPUS390XState *env, uint32_t = ipb, >>>> + uint8_t *ar) >>>> +{ >>> >>> Please add a comment here why this is done. (e.g., make all address >>> checks - like alignment checks - in the caller succeed, and we don't >>> need the address). >> >> * Addresses for protected guests are all offsets into the >> >> >> * satellite block which holds the IO control structures. Those >=20 > maybe mention SIDA as well huh? SIDA is the satellite block >=20 >> >> >> * control structures are always aligned and accessible, so we can= >> >> >> * return 0 here which will pass the following address checks. >> >> ? >=20 >=20 > Sounds good! >=20 >=20 --NNSvzJxyIyPgoZK3xR84wmeowjIzgCnCm-- --JMRRFLgkmFphkygfe9hj9hnbkwVopsBEs Content-Type: application/pgp-signature; name="signature.asc" Content-Description: OpenPGP digital signature Content-Disposition: attachment; filename="signature.asc" -----BEGIN PGP SIGNATURE----- iQIzBAEBCAAdFiEEwGNS88vfc9+v45Yq41TmuOI4ufgFAl5g4d0ACgkQ41TmuOI4 ufjrbxAAhq8ESiNZUCKC2kobIMZETeky/qjijtVNsMESFSOuXCDmYniFkCTj6cpS Cm2H149MxEbRI4IzRac9WQqvgRSwJllqQJ56HbcxX21BtePoCrxTBtdWcwuFkMqv 1MQ9Rrnnii5wWib6nJoO7i0sJR9tsrZ2DFIY0gL/cbMewAhLdKWLt0yUIxiUqcGi 1wyQNR/HB+eYlBFDQegQLKe/+PTkDTgoO7DNc81Q+NcAnVaHXvahVIKd4SQEN0R+ vAnkp5+zRVGBnlCcOA+/ujccXmP7+tviERwoFO+SJDyCltknzgMplXlDCkWQFDd7 B4+LFBjKeWtstx0nv9lHFm6yxvYW4tX2JN26xDyhFaw1xPqa+YReJatUF9rubv8k vJISSLXsSFTeOgVaSzln2wB7fwF9ewEcJS8qmQo3MVtoXQ0lyPW03X6HkK1WEFFn qJRXly06NGiilq19O5dCy3leYvOHYOzK8QAY1I647XR1vptFWsHNCTPzNtzPQu98 kh3TZ5/xh02n0FDsDEUh0aNiss053OOQMlNsj+V5Gsq4eX7hPeU0Gv/jyEwVUVXn 2DPMhCH2+1ztAimHQL5v2tIx/cQUfW2Kaf9KhGWzwiM1X3qP7Vj4MmG8t4YjALMm kDpSF6uCvSKVlPltojGEk/JXxXsAbaLPxHz95lQYj0s90pGuB4Y= =AHjJ -----END PGP SIGNATURE----- --JMRRFLgkmFphkygfe9hj9hnbkwVopsBEs--