kvm-arm: arm64: Introduce hyp page table empty checks

Introduce hyp_pxx_table_empty helpers for checking whether
a given table entry is empty. This will be used explicitly
once we switch to explicit routines for hyp page table walk.
Acked-by: Marc Zyngier <marc.zyngier@arm.com>
Acked-by: Christoffer Dall <christoffer.dall@linaro.org>
Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com>

arch/arm64/include/asm/kvm_mmu.h

@@ -249,6 +249,20 @@ static inline bool kvm_page_empty(void *ptr)
 #endif
 
 
+#define hyp_pte_table_empty(ptep) kvm_page_empty(ptep)
+
+#ifdef __PAGETABLE_PMD_FOLDED
+#define hyp_pmd_table_empty(pmdp) (0)
+#else
+#define hyp_pmd_table_empty(pmdp) kvm_page_empty(pmdp)
+#endif
+
+#ifdef __PAGETABLE_PUD_FOLDED
+#define hyp_pud_table_empty(pudp) (0)
+#else
+#define hyp_pud_table_empty(pudp) kvm_page_empty(pudp)
+#endif
+
 struct kvm;
 
 #define kvm_flush_dcache_to_poc(a,l)	__flush_dcache_area((a), (l))