linux-kernel - [PATCH v2 08/17] kvm-arm: arm: Introduce hyp page table empty checks

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Date:	Thu, 14 Apr 2016 14:20:56 +0100
From:	Suzuki K Poulose <suzuki.poulose@....com>
To:	linux-arm-kernel@...ts.infradead.org
Cc:	kvm@...r.kernel.org, marc.zyngier@....com,
	christoffer.dall@...aro.org, mark.rutland@....com,
	will.deacon@....com, catalin.marinas@....com,
	linux-kernel@...r.kernel.org, kvmarm@...ts.cs.columbia.edu,
	Suzuki K Poulose <suzuki.poulose@....com>
Subject: [PATCH v2 08/17] kvm-arm: arm: 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.

Cc: Marc Zyngier <marc.zyngier@....com>
Reviewed-by: Christoffer Dall <christoffer.dall@...aro.org>
Signed-off-by: Suzuki K Poulose <suzuki.poulose@....com>
---
 arch/arm/include/asm/kvm_mmu.h |    4 ++++
 1 file changed, 4 insertions(+)

diff --git a/arch/arm/include/asm/kvm_mmu.h b/arch/arm/include/asm/kvm_mmu.h
index 7d207b4..901c1ea 100644
--- a/arch/arm/include/asm/kvm_mmu.h
+++ b/arch/arm/include/asm/kvm_mmu.h
@@ -162,6 +162,10 @@ static inline bool kvm_page_empty(void *ptr)
 #define kvm_pmd_table_empty(kvm, pmdp) kvm_page_empty(pmdp)
 #define kvm_pud_table_empty(kvm, pudp) (0)
 
+#define hyp_pte_table_empty(ptep) kvm_page_empty(ptep)
+#define hyp_pmd_table_empty(pmdp) kvm_page_empty(pmdp)
+#define hyp_pud_table_empty(pudp) (0)
+
 static inline void *kvm_get_hwpgd(struct kvm *kvm)
 {
 	return kvm->arch.pgd;
-- 
1.7.9.5