Linux stub domains

Linux stub domains are used in QubesOS and OpenXT.

• (2018) Linux-based Device Model Stubdomains in Qubes OS, Marek Marczykowski-Górecki
• (2018) Xen Security Weather Report 2018, Lars Kurth
• (2017) MSI support for PCI device pass-through with stub domains, Simon Gaiser

Upstreaming

todo: add remaining patches

00/17 Add support for qemu-xen runnning in a Linux-based stubdomain:

• Aug 2018, v2 patch
• Jul 2018, v1 patch

05/17 libxl: Handle Linux stubdomain specific QEMU options:

• Jan 2019, v3 patch
• Aug 2018, v2 patch

08/17 xl: add stubdomain related options to xl config parser

• Jul 2018, v1 patch

Xen Summit 2019 Design Session

(diagram for architecture proposed by Brendan Kerrigan)

+-----------------------------------------------------+
| +-------------------------------------------------+ |
| |                                                 | |
| |                                                 | |
| |                                                 | |
| | +-------+ +---------+ +---------+      +-----+  | |
| | |DRM DCL| | ALSA    | | evdev   |      | qmp |  | |
| | +-------+ +---------+ +---------+ QEmu +-----+  | |
| +-------------------------------------------------+ |
|       |          |           |              |       |
|       |          |           |              |       |
| +---------+ +---------+ +---------+   +-----------+ |
| |  card0  | | ALSA/PA | |  evdev  |   |argo_stream| |
| +---------+ +---------+ +---------+   +-----------+ |
+-----------------------------------------------------+
| +---------+ +---------+ +---------+        +------+ |
| | Xen DRM | | Xen Snd | | Xen KBD | Linux  | Xen  | |
| |  Front  | |  Front  | |  Front  | Stubdom| Argo | |
| +---------+ +---------+ +---------+        +------+ |
+-----------------------------------------------------+

Interfaces between stubdom QEMU and dom0

• (June 2019) qemu-stubdom<=>dom0 interface changes
• (June 2019) Requirements for PVH stubdoms