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xen: add Kconfig option for Zephyr on Dom0less setups

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Dom0less is Xen mode without privileged domain. All guests are created
according to hypervisor device tree configuration on boot. Thus, there
is no Dom0 with console daemon, that usually manages console output
from domains.

Zephyr OS contains 2 serial drivers related to Xen hypervisor: regular
with console shared page and consoleio-based. The first one is for
setups with console daemon and usually was used for Zephyr DomU guests.
The second one previously was used only for Zephyr Dom0 and had
corresponding Kconfig options. But consoleio is also used as interface
for DomU output on Dom0less setups and should be configurable without
XEN_DOM0 option.

Add corresponding XEN_DOM0LESS config to Xen Kconfig files and proper
dependencies in serial drivers.

Signed-off-by: Dmytro Firsov <dmytro_firsov@epam.com>
Co-authored-by: Oleksandr Tyshchenko <oleksandr_tyshchenko@epam.com>
This commit is contained in:
Dmytro Firsov 2023-09-15 21:13:31 +03:00 • committed by Fabio Baltieri
commit ac0f731b2e
2 changed files with 14 additions and 4 deletions
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7
arch/arm64/core/xen/Kconfig
View file

@ -18,3 +18,10 @@ config XEN_DOM0
depends on XEN
help
Built binary will be used as Xen privileged domain (Domain 0).
config XEN_DOM0LESS
bool "Zephyr for Xen Dom0less setup"
depends on XEN && !XEN_DOM0
help
Configures Zephyr as DomU, that can be started on Dom0less
setup.

11
drivers/serial/Kconfig.xen
View file

@ -10,19 +10,22 @@ config UART_XEN_HVC
depends on DT_HAS_XEN_HVC_UART_ENABLED
select SERIAL_HAS_DRIVER
select SERIAL_SUPPORT_INTERRUPT
depends on XEN && !XEN_DOM0
depends on XEN && !XEN_DOM0 && !XEN_DOM0LESS
help
Enable Xen ring buffer based hypervisor console driver. Used
for Zephyr as unprivileged domain.
config UART_XEN_HVC_CONSOLEIO
bool "Xen hypervisor Dom0 console UART driver"
bool "Xen hypervisor consoleio UART driver"
select SERIAL_HAS_DRIVER
depends on XEN_DOM0
depends on XEN_DOM0 || XEN_DOM0LESS
default y
help
Enable Xen hypervisor console driver. Used for Zephyr as
privileged domain (Dom0).
privileged domain (Dom0) or for Zephyr DomU in Dom0less
configuration. Dom0less configuration does not have
privileged domain. Thus, there is no console daemon and Xen
manages all domain outputs through the consoleio interface.
config XEN_HVC_INIT_PRIORITY
int "Xen hypervisor console init priority"