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VFIO/vfio-user: specify NVMe namespace to boot from

From: Thanos Makatos
Subject: VFIO/vfio-user: specify NVMe namespace to boot from
Date: Mon, 12 Jul 2021 13:24:07 +0000

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 

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