Re: [Xen-devel] [RFC] scf: SCF device tree and configuration documentation

[Andrii Anisov <andrii_anisov@xxxxxxxx>]

Dear All,

During the topic implementation I faced a nasty issue with a DomU vgic 
configuration.
Originally I planned that the partial device tree for DomU is being 
passed to the
hypervisor from libxl__arch_domain_create, but it is too late to set 
vgic configuration
at this time. The DomU’s vgic is configured from 
libxl_arch_domain_prepare_config, and
now it seems it is a proper place to send device_tree to a hypervisor as 
a part of
configuration. Provided that I need the device tree blob even later, 
during device
tree creation for domU (in libxl_prepare_dtb) I would like to have it 
read from a file
once and keep it during guest domain creation process.

My problem is that domain creation functions stack mainly operates with 
auto generated
structures. For my current understanding it means that I have to 
introduce another
libxl type (f.e. File) which will read device tree file and operate with 
a binary blob.
Understanding the complexity of such a change I would like to hear 
comments about the
SCF configuration concept and feasibility of passing device tree blob 
from toolstack
to hypervisor as a part of domain configuration.

*Andrii Anisov*



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