Hi Jean, On 12/18/19 5:08 PM, Jean-Philippe Brucker wrote: > On Tue, Dec 17, 2019 at 06:07:26PM +0100, Auger Eric wrote: >> Hi Jean, >> >> On 12/9/19 7:05 PM, Jean-Philippe Brucker wrote: >> >> s/Propate/Propagate in the commit title. >>> Now that we support substream IDs, initialize s1cdmax with the number of >>> SSID bits supported by a master and the SMMU. >>> >>> Context descriptor tables are allocated once for the first master >>> attached to a domain. Therefore attaching multiple devices with >>> different SSID sizes is tricky, and we currently don't support it. >>> >>> As a future improvement it would be nice to at least support attaching a >>> SSID-capable device to a domain that isn't using SSID, by reallocating >>> the SSID table. >> Isn't that use case relevant (I mean using both devices in a non SSID >> use case). For platform devices you can work this around with FW but for >> PCI devices? > > Normally each device gets its own domain. Especially since PASID is a PCI > Express capability, I expect them to be properly isolated with ACS, each > with its own IOMMU group. So I don't think this is too relevant for the > moment, it would be a quirk for a broken system. OK Eric > > Thanks, > Jean >
