[RFC PATCH 14/27] KVM: arm64: Factor out vector address calculation

[Quentin Perret]

In order to re-map the guest vectors at EL2 when pKVM is enabled,
refactor __kvm_vector_slot2idx() and kvm_init_vector_slot() to move all
the address calculation logic in a static inline function.

Signed-off-by: Quentin Perret <qperret at google.com>
---
 arch/arm64/include/asm/kvm_mmu.h | 8 ++++++++
 arch/arm64/kvm/arm.c             | 9 +--------
 2 files changed, 9 insertions(+), 8 deletions(-)

diff --git a/arch/arm64/include/asm/kvm_mmu.h b/arch/arm64/include/asm/kvm_mmu.h
index 5168a0c516ae..cb104443d8e4 100644
--- a/arch/arm64/include/asm/kvm_mmu.h
+++ b/arch/arm64/include/asm/kvm_mmu.h
@@ -171,6 +171,14 @@ phys_addr_t kvm_mmu_get_httbr(void);
 phys_addr_t kvm_get_idmap_vector(void);
 int kvm_mmu_init(void);
 
+static inline void *__kvm_vector_slot2addr(void *base,
+					   enum arm64_hyp_spectre_vector slot)
+{
+	int idx = slot - (slot != HYP_VECTOR_DIRECT);
+
+	return base + (idx * SZ_2K);
+}
+
 struct kvm;
 
 #define kvm_flush_dcache_to_poc(a,l)	__flush_dcache_area((a), (l))
diff --git a/arch/arm64/kvm/arm.c b/arch/arm64/kvm/arm.c
index c7f8fca97202..b1e1747e4bbf 100644
--- a/arch/arm64/kvm/arm.c
+++ b/arch/arm64/kvm/arm.c
@@ -1318,16 +1318,9 @@ static unsigned long nvhe_percpu_order(void)
 /* A lookup table holding the hypervisor VA for each vector slot */
 static void *hyp_spectre_vector_selector[BP_HARDEN_EL2_SLOTS];
 
-static int __kvm_vector_slot2idx(enum arm64_hyp_spectre_vector slot)
-{
-	return slot - (slot != HYP_VECTOR_DIRECT);
-}
-
 static void kvm_init_vector_slot(void *base, enum arm64_hyp_spectre_vector slot)
 {
-	int idx = __kvm_vector_slot2idx(slot);
-
-	hyp_spectre_vector_selector[slot] = base + (idx * SZ_2K);
+	hyp_spectre_vector_selector[slot] = __kvm_vector_slot2addr(base, slot);
 }
 
 static int kvm_init_vector_slots(void)
-- 
2.29.2.299.gdc1121823c-goog