[PATCH v4 04/15] arm64: kvm: Use build-time defines in has_vhe()

David Brazdil
2020-06-25T13:15:38Z

Build system compiles hyp code with macros specifying if the code belongs
to VHE or nVHE. Use these macros to evaluate has_vhe() at compile time.

Signed-off-by: David Brazdil <dbrazdil@google.com>
---
arch/arm64/include/asm/virt.h | 13 ++++++++++---
1 file changed, 10 insertions(+), 3 deletions(-)

diff --git a/arch/arm64/include/asm/virt.h b/arch/arm64/include/asm/virt.h
index 5051b388c654..09977acc007d 100644
--- a/arch/arm64/include/asm/virt.h
+++ b/arch/arm64/include/asm/virt.h
@@ -85,10 +85,17 @@ static inline bool is_kernel_in_hyp_mode(void)

static __always_inline bool has_vhe(void)
{
- if (cpus_have_final_cap(ARM64_HAS_VIRT_HOST_EXTN))
+ /*
+ * The following macros are defined for code specic to VHE/nVHE.
+ * If has_vhe() is inlined into those compilation units, it can
+ * be determined statically. Otherwise fall back to caps.
+ */
+ if (__is_defined(__KVM_VHE_HYPERVISOR__))
return true;
-
- return false;
+ else if (__is_defined(__KVM_NVHE_HYPERVISOR__))
+ return false;
+ else
+ return cpus_have_final_cap(ARM64_HAS_VIRT_HOST_EXTN);
}

#endif /* __ASSEMBLY__ */
--
2.27.0