On 3/8/2025 1:05 PM, Arnd Bergmann wrote:

On Fri, Mar 7, 2025, at 23:02, Roman Kisel wrote:

quoted

@@ -5,18 +5,20 @@ menu "Microsoft Hyper-V guest support"
  config HYPERV
  	tristate "Microsoft Hyper-V client drivers"
  	depends on (X86 && X86_LOCAL_APIC && HYPERVISOR_GUEST) \
-		|| (ACPI && ARM64 && !CPU_BIG_ENDIAN)
+		|| (ARM64 && !CPU_BIG_ENDIAN)
+	depends on (ACPI || HYPERV_VTL_MODE)
  	select PARAVIRT
  	select X86_HV_CALLBACK_VECTOR if X86
-	select OF_EARLY_FLATTREE if OF
  	help
  	  Select this option to run Linux as a Hyper-V client operating
  	  system.

  config HYPERV_VTL_MODE
  	bool "Enable Linux to boot in VTL context"
-	depends on X86_64 && HYPERV
+	depends on (X86_64 || ARM64)
  	depends on SMP
+	select OF_EARLY_FLATTREE
+	select OF
  	default n
  	help

Having the dependency below the top-level Kconfig entry feels a little
counterintuitive. You could flip that back as it was before by doing

       select HYPERV_VTL_MODE if !ACPI
       depends on ACPI || SMP

in the HYPERV option, leaving the dependency on HYPERV in
HYPERV_VTL_MODE.

I was implementing Michael's suggestion, and might've gone a bit
overboard, my bad. I'll fix this, thanks a lot for reviewing!

Is OF_EARLY_FLATTREE actually needed on x86?

No, it is not needed on x86. It is only needed when VTL mode is used.

       Arnd

-- 
Thank you,
Roman