On Mon, Jul 12, 2021 at 01:24:07PM +0000, Thanos Makatos wrote: > We're working on implementing a virtual NVMe controller based on SPDK and a > multiprocess-qemu branch that uses the vfio-user. We're facing a problem > where the existing API doesn't allow us to tell QEMU from which NVMe > namespace we'd like SeaBIOS to boot from. > > How can we solve this problem? Can we add a parameter to the '-boot' option, > e.g. '-boot path=/devices/pciblah/...@namespace0'? AFAIK VFIO should have the > same problem. > > The corresponding SeaBIOS patch can be found in > https://mail.coreboot.org/hyperkitty/list/seab...@seabios.org/thread/2Q7NPH7TJNHK6JGPHQL7755HILO23ISN/
Hi, I have CCed Gerd Hoffmann on a hunch that he may have ideas. Yes, I think the path needs to include the Namespace ID similar to how SCSI boot paths include the target/channel/LUN. When the SeaBIOS NVMe driver probes the controller is should discover the available Namespaces and set up individual drives for each Namespace. That would be analogous to virtio_scsi_add_lun(). Stefan
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