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Wed, 7 Dec 2022 16:22:14 GMT Received: from b03ledav004.gho.boulder.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id DCC197805E; Wed, 7 Dec 2022 17:35:42 +0000 (GMT) Received: from b03ledav004.gho.boulder.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 978597805C; Wed, 7 Dec 2022 17:35:40 +0000 (GMT) Received: from lingrow.int.hansenpartnership.com (unknown [9.211.97.164]) by b03ledav004.gho.boulder.ibm.com (Postfix) with ESMTP; Wed, 7 Dec 2022 17:35:40 +0000 (GMT) Message-ID: <9365af87923dc2dd59b7cd6aa59e1fba33f4bb5a.camel@linux.ibm.com> Subject: Re: [edk2-devel] [Patch 1/2] OvmfPkg: Change default to disable MptScsi and PvScsi From: "James Bottomley" Reply-To: jejb@linux.ibm.com To: Ard Biesheuvel , Gerd Hoffmann Cc: Mike Maslenkin , devel@edk2.groups.io, dann.frazier@canonical.com, michael.d.kinney@intel.com, Ard Biesheuvel , Jiewen Yao , Jordan Justen , Sebastien Boeuf , Brijesh Singh , Erdem Aktas , Min Xu , Tom Lendacky , 1016359@bugs.debian.org Date: Wed, 07 Dec 2022 11:22:10 -0500 In-Reply-To: References: <20220726194640.1920-1-michael.d.kinney@intel.com> <20220726194640.1920-2-michael.d.kinney@intel.com> <20221206055649.33rbcbkyuavpxqdk@sirius.home.kraxel.org> <20221207074123.ccj63ciwywubqj6k@sirius.home.kraxel.org> <887bc678bbd4a356edd420809bffa0964e0b162b.camel@linux.ibm.com> <20221207160140.ilh63xxxgefs5hff@sirius.home.kraxel.org> User-Agent: Evolution 3.42.4 MIME-Version: 1.0 X-TM-AS-GCONF: 00 X-Proofpoint-ORIG-GUID: a7YN8pDk3nMSdw6O6DrTCGJz-W0WT9s- X-Proofpoint-GUID: zH8xvIyCmigfNxo5-ckortWVJjS35s3X X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.205,Aquarius:18.0.923,Hydra:6.0.545,FMLib:17.11.122.1 definitions=2022-12-07_08,2022-12-07_01,2022-06-22_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 lowpriorityscore=0 suspectscore=0 bulkscore=0 phishscore=0 adultscore=0 priorityscore=1501 spamscore=0 mlxscore=0 mlxlogscore=999 impostorscore=0 clxscore=1015 malwarescore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2210170000 definitions=main-2212070139 X-MIME-Autoconverted: from 8bit to quoted-printable by mx0b-001b2d01.pphosted.com id 2B7FsmYe029822 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Wed, 2022-12-07 at 17:04 +0100, Ard Biesheuvel wrote: > On Wed, 7 Dec 2022 at 17:02, Gerd Hoffmann wrote: > >=20 > > On Wed, Dec 07, 2022 at 09:14:39AM -0500, James Bottomley wrote: > > > On Wed, 2022-12-07 at 15:09 +0100, Ard Biesheuvel wrote: > > > > So at some point, these drivers will be removed rather than > > > > kept > > > > alive by the core team unless someone steps up. > > >=20 > > > How important is keeping them alive? > >=20 > > Most common use case is probably bootimg images created on other > > hypervisors on qemu.=C2=A0 Otherwise there is little reason to use > > something which is not virtio-scsi. > >=20 > > > I can volunteer to "maintain" them which I anticipate won't be > > > much effort (plus I'm used to looking after obsolete SCSI > > > equipment).=C2=A0 The hardware is obsolete, so the mechanics of the= ir > > > emulation isn't going to change, the only potential risk is > > > changes in the guest to host transmission layer that breaks > > > something. > >=20 >=20 > Thanks James, that would be very helpful. >=20 > > Yes, I don't expect it being much effort, but knowing oldish scsi > > stuff certainly helps understanding the driver code if needed.=C2=A0 = If > > you want step up sent a patch updating Maintainers.txt accordingly. > >=20 >=20 > Having the informed opinion of a domain expert should allow us to > diagnose issued related to these drivers with more confidence, and > also give us insight in how obsolete those drivers actually are. >=20 > I can send the patch if you prefer. Sure, who can resist someone else doing all the work. I note we do have a maintained LSI driver: OvmfPkg/LsiScsiDxe. It seems to be based on the 53c896 which is really only a marginal subset of the 1030 ... if I'm remembering correctly the 1030 did Low Voltage Differential (so a faster SCSI Parallel bus), but since that's a SCSI Bus protocol, it should have no real impact on the utility of the emulation. Is the LsiScsiDxe usable by Debian? James