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>

diff --git a/arch/arm/mm/Kconfig b/arch/arm/mm/Kconfig
index 3fd629d..025d173 100644 (file)
--- 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