ARM: virt: hide CONFIG_ARM_VIRT_EXT from user

ARM_VIRT_EXT is a property of CPU_V7, but does not adversely affect
other CPUs that can be built into the same kernel image (i.e. ARMv6+).

This patch defaults ARM_VIRT_EXT to y if CPU_V7, allowing hypervisors
such as KVM to make better use of the option and being able to rely
on hyp-mode boot support.

Signed-off-by: Will Deacon <will.deacon@arm.com>

1 files changed, 3 insertions, 7 deletions

diff --git a/arch/arm/mm/Kconfig b/arch/arm/mm/Kconfig
index 3fd629d5a513..025d17328730 100644
--- a/arch/arm/mm/Kconfig
+++ b/arch/arm/mm/Kconfig
@@ -629,8 +629,9 @@ config ARM_THUMBEE
           make use of it. Say N for code that can run on CPUs without ThumbEE.
 
 config ARM_VIRT_EXT
-        bool "Native support for the ARM Virtualization Extensions"
-        depends on MMU && CPU_V7
+        bool
+        depends on MMU
+        default y if CPU_V7
         help
           Enable the kernel to make use of the ARM Virtualization
           Extensions to install hypervisors without run-time firmware
@@ -640,11 +641,6 @@ config ARM_VIRT_EXT
           use of this feature.  Refer to Documentation/arm/Booting for
           details.
 
-          It is safe to enable this option even if the kernel may not be
-          booted in HYP mode, may not have support for the
-          virtualization extensions, or may be booted with a
-          non-compliant bootloader.
-
 config SWP_EMULATE
         bool "Emulate SWP/SWPB instructions"
         depends on !CPU_USE_DOMAINS && CPU_V7