> -----Original Message----- > From: Tian, Kevin [mailto:kevin.t...@intel.com] > Sent: 07 August 2018 10:20 > To: Paul Durrant <paul.durr...@citrix.com>; xen-devel@lists.xenproject.org > Cc: Stefano Stabellini <sstabell...@kernel.org>; Wei Liu > <wei.l...@citrix.com>; Andrew Cooper <andrew.coop...@citrix.com>; Tim > (Xen.org) <t...@xen.org>; George Dunlap <george.dun...@citrix.com>; > Julien Grall <julien.gr...@arm.com>; Jan Beulich <jbeul...@suse.com>; Ian > Jackson <ian.jack...@citrix.com> > Subject: RE: [Xen-devel] [PATCH v5 12/15] x86: add iommu_op to enable > modification of IOMMU mappings > > > From: Paul Durrant [mailto:paul.durr...@citrix.com] > > Sent: Tuesday, August 7, 2018 5:12 PM > > > > > > > So here current version pvIOMMU only provides global address space, > > > though unlike any existing IOMMU. maybe we should explicitly call out > > > this fact in some capability field for future extension. > > > > > > > Does Linux expose such a thing through the dma_ops? I didn't see one, but > > if there is one then we can of course set it correctly according to the > > limitations of the underying hypervisor. Thus, if Xen is modified in future > > to > > support per-device mappings, this could be exposed through to the drivers > > using DMA. > > > > not about Linux internal exposing. it's about hypervisor exposing > the capability to pvIOMMU driver, so the latter knows whether to > enable per-device mapping. But as you commented in another > mail, it could be achieved through enabling sequence. >
Ok. Let's go with that then. > btw could you put clarification according to our discussions in your > next version coverletter to set the tone clear from start? I don't > think I'll be the only one interpreting wrong goal for this work. :-) > I can certainly do that. I'll put an explanation of the XenServer use-case in as a concrete example too. Paul > Thanks > Kevin _______________________________________________ Xen-devel mailing list Xen-devel@lists.xenproject.org https://lists.xenproject.org/mailman/listinfo/xen-devel
