[PATCH 5/6] KVM: arm64: Kill KVM_PGTABLE_S2_NOFWB

[Marc Zyngier]

Nobody is using this flag anymore, so remove it. This allows
some cleanup for stage2_has_fwb(), whic doesn't need to take the
pgt as a parameter anymore.

Signed-off-by: Marc Zyngier <maz at kernel.org>
---
 arch/arm64/include/asm/kvm_pgtable.h |  7 ++-----
 arch/arm64/kvm/hyp/pgtable.c         | 17 +++++++----------
 2 files changed, 9 insertions(+), 15 deletions(-)

diff --git a/arch/arm64/include/asm/kvm_pgtable.h b/arch/arm64/include/asm/kvm_pgtable.h
index 9ce51a637da0a..2198b62428832 100644
--- a/arch/arm64/include/asm/kvm_pgtable.h
+++ b/arch/arm64/include/asm/kvm_pgtable.h
@@ -229,15 +229,12 @@ struct kvm_pgtable_mm_ops {
 
 /**
  * enum kvm_pgtable_stage2_flags - Stage-2 page-table flags.
- * @KVM_PGTABLE_S2_NOFWB:	Don't enforce Normal-WB even if the CPUs have
- *				ARM64_HAS_STAGE2_FWB.
  * @KVM_PGTABLE_S2_IDMAP:	Only use identity mappings.
  * @KVM_PGTABLE_S2_AS_S1:	Final memory attributes are that of Stage-1.
  */
 enum kvm_pgtable_stage2_flags {
-	KVM_PGTABLE_S2_NOFWB			= BIT(0),
-	KVM_PGTABLE_S2_IDMAP			= BIT(1),
-	KVM_PGTABLE_S2_AS_S1			= BIT(2),
+	KVM_PGTABLE_S2_IDMAP			= BIT(0),
+	KVM_PGTABLE_S2_AS_S1			= BIT(1),
 };
 
 /**
diff --git a/arch/arm64/kvm/hyp/pgtable.c b/arch/arm64/kvm/hyp/pgtable.c
index 07561a227f75e..3c2f7967fdc03 100644
--- a/arch/arm64/kvm/hyp/pgtable.c
+++ b/arch/arm64/kvm/hyp/pgtable.c
@@ -631,12 +631,9 @@ u64 kvm_get_vtcr(u64 mmfr0, u64 mmfr1, u32 phys_shift)
 	return vtcr;
 }
 
-static bool stage2_has_fwb(struct kvm_pgtable *pgt)
+static bool stage2_has_fwb(void)
 {
-	if (!cpus_have_final_cap(ARM64_HAS_STAGE2_FWB))
-		return false;
-
-	return !(pgt->flags & KVM_PGTABLE_S2_NOFWB);
+	return cpus_have_final_cap(ARM64_HAS_STAGE2_FWB);
 }
 
 void kvm_tlb_flush_vmid_range(struct kvm_s2_mmu *mmu,
@@ -664,10 +661,10 @@ void kvm_tlb_flush_vmid_range(struct kvm_s2_mmu *mmu,
 		kvm_pte_t __attr;					\
 		if((pgt)->flags & KVM_PGTABLE_S2_AS_S1)			\
 			__attr = PAGE_S2_MEMATTR(AS_S1,			\
-						 stage2_has_fwb(pgt));	\
+						 stage2_has_fwb());	\
 		else							\
 			__attr = PAGE_S2_MEMATTR(attr,			\
-						 stage2_has_fwb(pgt));	\
+						 stage2_has_fwb());	\
 									\
 		__attr;							\
 	})
@@ -879,7 +876,7 @@ static bool stage2_unmap_defer_tlb_flush(struct kvm_pgtable *pgt)
 	 * system supporting FWB as the optimization is entirely
 	 * pointless when the unmap walker needs to perform CMOs.
 	 */
-	return system_supports_tlb_range() && stage2_has_fwb(pgt);
+	return system_supports_tlb_range() && stage2_has_fwb();
 }
 
 static void stage2_unmap_put_pte(const struct kvm_pgtable_visit_ctx *ctx,
@@ -1167,7 +1164,7 @@ static int stage2_unmap_walker(const struct kvm_pgtable_visit_ctx *ctx,
 		if (mm_ops->page_count(childp) != 1)
 			return 0;
 	} else if (stage2_pte_cacheable(pgt, ctx->old)) {
-		need_flush = !stage2_has_fwb(pgt);
+		need_flush = !stage2_has_fwb();
 	}
 
 	/*
@@ -1397,7 +1394,7 @@ int kvm_pgtable_stage2_flush(struct kvm_pgtable *pgt, u64 addr, u64 size)
 		.arg	= pgt,
 	};
 
-	if (stage2_has_fwb(pgt))
+	if (stage2_has_fwb())
 		return 0;
 
 	return kvm_pgtable_walk(pgt, addr, size, &walker);
-- 
2.47.3