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X-OriginatorOrg: arm.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 15 Jun 2021 06:08:14.9032 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: ebaf0182-e710-4a9c-25f1-08d92fc3f66d X-MS-Exchange-CrossTenant-Id: f34e5979-57d9-4aaa-ad4d-b122a662184d X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=f34e5979-57d9-4aaa-ad4d-b122a662184d;Ip=[63.35.35.123];Helo=[64aa7808-outbound-1.mta.getcheckrecipient.com] X-MS-Exchange-CrossTenant-AuthSource: DB5EUR03FT052.eop-EUR03.prod.protection.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: DB9PR08MB7024 Hi julien > -----Original Message----- > From: Julien Grall > Sent: Wednesday, June 9, 2021 6:47 PM > To: Bertrand Marquis > Cc: Stefano Stabellini ; Julien Grall > ; Penny Zheng ; xen- > devel@lists.xenproject.org; Wei Chen ; nd > > Subject: Re: [PATCH 01/10] xen/arm: introduce domain on Static Allocation >=20 >=20 >=20 > On 09/06/2021 10:56, Bertrand Marquis wrote: > > Hi All, >=20 > Hi, >=20 > >> On 7 Jun 2021, at 19:09, Julien Grall >> > wrote: > >> Feel free to propose one. I suggested to use /reserved-memory because > >> this is the approach that makes the most sense to me (see my reply abo= ve). > >> > >> TBH, even after your explanation, I am still a bit puzzled into why > >> /reserved-memory cannot be leveraged to exclude domain region from > >> the hypervisor allocator. > > > > I really tend to think that the original solution from Penny is for > > now the easiest and simplest to document. >=20 > I can live with Penny's solution so long we don't duplicate the parsing a= nd we > don't create new datastructure in Xen for the new type of reserved memory= . > However... >=20 Just to confirm what I understand here, you are not only worrying about the= duplication code imported in dt_unreserved_regions, but also must introducing another path in func early= _scan_node to parse my first implementation "xen,static-mem =3D <...>", right? On duplication code part, I could think of a way to extract common codes to= fix, but for introducing another new path to parse, FWIT, it is inevitable if not re-using reserved-memory. ;/ > > In the long term, using directly memory and giving in it the address > > range directly is the most natural solution but that would clash with > > the current usage for it. >=20 > ... we are already going to have quite some churn to support the system > device-tree. So I don't want yet another binding to be invented in a few > months time. >=20 > IOW, the new binding should be a long term solution rather than a tempora= ry > one to fill the gap until we agree on what you call "domain v2". >=20 > Cheers, >=20 > -- Cheers Penny > Julien Grall