linux-kernel - [PATCH hyperv-next v4 2/6] Drivers: hv: Enable VTL mode for arm64

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Message-ID: <20250212014321.1108840-3-romank@linux.microsoft.com>
Date: Tue, 11 Feb 2025 17:43:17 -0800
From: Roman Kisel <romank@...ux.microsoft.com>
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Subject: [PATCH hyperv-next v4 2/6] Drivers: hv: Enable VTL mode for arm64

Kconfig dependencies for arm64 guests on Hyper-V require that be
ACPI enabled, and limit VTL mode to x86/x64. To enable VTL mode
on arm64 as well, update the dependencies. Since VTL mode requires
DeviceTree instead of ACPI, don’t require arm64 guests on Hyper-V
to have ACPI unconditionally.

Signed-off-by: Roman Kisel <romank@...ux.microsoft.com>
---
 drivers/hv/Kconfig | 10 ++++++----
 1 file changed, 6 insertions(+), 4 deletions(-)

diff --git a/drivers/hv/Kconfig b/drivers/hv/Kconfig
index 862c47b191af..db9912ef96a8 100644
--- a/drivers/hv/Kconfig
+++ b/drivers/hv/Kconfig
@@ -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 || ARM64)
 	depends on SMP
+	select OF_EARLY_FLATTREE
+	select OF
 	default n
 	help
 	  Virtual Secure Mode (VSM) is a set of hypervisor capabilities and
@@ -31,7 +33,7 @@ config HYPERV_VTL_MODE
 
 	  Select this option to build a Linux kernel to run at a VTL other than
 	  the normal VTL0, which currently is only VTL2.  This option
-	  initializes the x86 platform for VTL2, and adds the ability to boot
+	  initializes the kernel to run in VTL2, and adds the ability to boot
 	  secondary CPUs directly into 64-bit context as required for VTLs other
 	  than 0.  A kernel built with this option must run at VTL2, and will
 	  not run as a normal guest.
-- 
2.43.0