Migrate to upstream Xen version of Linux stub domains, derived from QubesOS and OpenXT

Description

Qubes is upstreaming Linux stubdoms to Xen. We need to review the upstream patches and validate compatibility with OpenEmbedded and OpenXT, so we have a common upstream foundation for future improvements, e.g. PCI device isolation.

2017 blog post, MSI support for PCI device pass-through with stub domains, https://www.qubes-os.org/news/2017/10/18/msi-support/

2018/2019 in progress patches

Qubes issue: https://github.com/QubesOS/qubes-issues/issues/4775

Validation Steps

None

Assignee

Chris Rogers

Reporter

Rich Persaud

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Priority

Critical
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