On 01.03.19 10:56, Pedro Chaves wrote:
Hello,I would like to know if there is any way to partition an USB hub between cells. 1. From what I understand, the USB Controller would need to be a shared PCI device, as it would be used by all of the cells that would need access to the hub. 2. Even if it is possible to share an USB controller, is there any way to guarantee exclusive cell access to an USB device connected to a hub? 3. If any of the previous statements are applicable, how does jailhouse handle these interactions? 4. If 1 and/or 2 are not possible, is there any other way I can extend the number of USB devices I can connect to a board with few ports, and be able to assign them to different cells? +------+ +------+ +------+ Cell | | Cell +-------+ | +------+ +------+ | | | | +------+ +------+ | | | USB | | USB | | +-> |Device| |Device| <--+ | | | | +--+---+ +--+---+ | | | +---------+ | +-+ USB Hub +--+ +---+-----+ | +----+-----+ | Single | | USB Port | +----------+ Thank you, Pedro Chaves.
Possibly something like https://stackoverflow.com/questions/43117293/what-is-xhci-iov-and-how-does-it-work would help, but I have no experience with that, and we lack any preintegration (if not more) in Jailhouse.
At the same time, I know that people already used SR-IOV for network controllers under Jailhouse. The root cell configured the PF (physical function), and then Jailhouse "stole" some VFs (virtual functions) for it to hand them out to other cells.
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 [email protected]. For more options, visit https://groups.google.com/d/optout.
