On 28.07.2025 19:07, Oleksii Moisieiev wrote: > This commit introduces a new Kconfig option, `CONFIG_DOM0_BOOT`, to > allow for building Xen without support for booting a regular domain (Dom0). > This functionality is primarily intended for the ARM architecture. > > A new Kconfig symbol, `HAS_DOM0`, has been added and is selected by > default for ARM and X86 architecture. This symbol signifies that an > architecture has the capability to support a Dom0. > > The `DOM0_BOOT` option depends on `HAS_DOM0` and defaults to 'y'. For > expert users, this option can be disabled (`CONFIG_EXPERT=y` and no > `CONFIG_DOM0_BOOT` in the config), which will compile out the Dom0 > creation code on ARM. This is useful for embedded or dom0less-only > scenarios to reduce binary size and complexity. > > The ARM boot path has been updated to panic if it detects a non-dom0less > configuration while `CONFIG_DOM0_BOOT` is disabled, preventing an invalid > boot. > > Signed-off-by: Oleksii Moisieiev <oleksii_moisie...@epam.com> > > --- > > Changes in v2: > - decided not to rename HAS_DOM0 (HAS_OPTIONAL_DOM0 was another option > suggested in ML) because in this case HAS_DOM0LESS should be renamed > either. > - fix order of HAS_DOM0 config parameter > - add HAS_DOM0 option to x86 architecture.
I question the way changes were made. I don't see the value of ... > --- a/xen/arch/x86/Kconfig > +++ b/xen/arch/x86/Kconfig > @@ -18,6 +18,7 @@ config X86 > select HAS_COMPAT > select HAS_CPUFREQ > select HAS_DIT > + select HAS_DOM0 > select HAS_EHCI > select HAS_EX_TABLE > select HAS_FAST_MULTIPLY ... this, as it has no effect ... > --- a/xen/common/Kconfig > +++ b/xen/common/Kconfig > @@ -21,6 +21,14 @@ config DOM0LESS_BOOT > Xen boot without the need of a control domain (Dom0), which could be > present anyway. > > +config DOM0_BOOT > + bool "Dom0 boot support" if EXPERT > + depends on HAS_DOM0 && HAS_DEVICE_TREE && DOMAIN_BUILD_HELPERS ... here due to the further dependencies, and .., > + default y ... hence this option still doesn't end up constant-Y for x86. Jan
