On 05.12.19 17:50, Marco Solieri wrote: > On Tue, Dec 03, 2019 at 08:41:13AM +0000, Peng Fan wrote: >>> On Mon, Dec 02, 2019 at 02:52:04AM +0000, Peng Fan wrote: >>>>> I am reading the patchset, but this patchset could not resolve the >>>>> cache contention between root cell Linux and inmate cell, right? It >>>>> only address the cache contention inside the inmate cell, if I understand >>> correctly. >>> >>> This is correct. The documentation reads: >>> >>> | Since Jailhouse is currently lacking SMMU support, and since the >>> | colored memory mapping must be provided to DMA devices to allow them a >>> | coherent memory view, coloring for this kind of devices is not >>> | available. This also explains why also coloring support for the Linux >>> | root cell is not provided, although possible and tested with a simple hot >>> | remapping procedure. >>> >>>>> Is there any v2 plan to address the upper issue? >>> >>> Forward porting to master and integration with SMMU support are the two >>> most important task on my team TODO list. Once these steps are done, it will >>> be very easy to also have root-cell colouring. I have planned the firsts for >>> 20Q1. >> > >> NXP i.MX jailhouse has smmu-v2 support, but it currently conflicts with >> smmu-v3 code in upstream. I have not find time to restructure v2 code. You >> could refer if you need v2. > > I know. Do you have plans to merge SMMU-v2 support in upstream? It is very > important for colouring Linux, such as the root-cell. But I am sure that many > others than me are waiting for it. > > Also, since v3 support is only preliminary and the SMMU is not really usable, > as > far as I understand, and since v3 devices are quite less common, perhaps the > v2 > support can be integrated easier and earlier than you think.
1-level translation is complete, 2-level translation is missing. The latter is only needed when running CMA-requiring devices in a cell that cannot be mapped into physically contiguous memory (e.g. via pre-allocation). Due to the involved significant complexity increase, I decided to not take this extension yet. Jan -- Siemens AG, Corporate Technology, CT RDA IOT SES-DE Corporate Competence Center Embedded Linux -- You received this message because you are subscribed to the Google Groups "Jailhouse" group. To unsubscribe from this group and stop receiving emails from it, send an email to jailhouse-dev+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/jailhouse-dev/f590e962-ab8c-ec84-abe5-65b7a3fa4377%40siemens.com.
