linux-kernel - [PATCH v3 27/32] KVM: arm64: Refactor stage2_map_set_prot

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Message-Id: <20210302150002.3685113-28-qperret@google.com>
Date:   Tue,  2 Mar 2021 14:59:57 +0000
From:   Quentin Perret <qperret@...gle.com>
To:     catalin.marinas@....com, will@...nel.org, maz@...nel.org,
        james.morse@....com, julien.thierry.kdev@...il.com,
        suzuki.poulose@....com
Cc:     android-kvm@...gle.com, linux-kernel@...r.kernel.org,
        kernel-team@...roid.com, kvmarm@...ts.cs.columbia.edu,
        linux-arm-kernel@...ts.infradead.org, tabba@...gle.com,
        mark.rutland@....com, dbrazdil@...gle.com, mate.toth-pal@....com,
        seanjc@...gle.com, qperret@...gle.com, robh+dt@...nel.org
Subject: [PATCH v3 27/32] KVM: arm64: Refactor stage2_map_set_prot_attr()

In order to ease its re-use in other code paths, refactor
stage2_map_set_prot_attr() to not depend on a stage2_map_data struct.
No functional change intended.

Signed-off-by: Quentin Perret <qperret@...gle.com>
---
 arch/arm64/kvm/hyp/pgtable.c | 19 ++++++++-----------
 1 file changed, 8 insertions(+), 11 deletions(-)

diff --git a/arch/arm64/kvm/hyp/pgtable.c b/arch/arm64/kvm/hyp/pgtable.c
index 8e7059fcfd40..8aa01a9e2603 100644
--- a/arch/arm64/kvm/hyp/pgtable.c
+++ b/arch/arm64/kvm/hyp/pgtable.c
@@ -494,8 +494,7 @@ u64 kvm_get_vtcr(u64 mmfr0, u64 mmfr1, u32 phys_shift)
 	return vtcr;
 }
 
-static int stage2_map_set_prot_attr(enum kvm_pgtable_prot prot,
-				    struct stage2_map_data *data)
+static kvm_pte_t stage2_get_prot_attr(enum kvm_pgtable_prot prot)
 {
 	bool device = prot & KVM_PGTABLE_PROT_DEVICE;
 	kvm_pte_t attr = device ? PAGE_S2_MEMATTR(DEVICE_nGnRE) :
@@ -504,15 +503,15 @@ static int stage2_map_set_prot_attr(enum kvm_pgtable_prot prot,
 
 	if (prot & KVM_PGTABLE_PROT_NONE) {
 		if (prot != KVM_PGTABLE_PROT_NONE)
-			return -EINVAL;
+			return 0;
 		attr |= KVM_PTE_LEAF_SW_BIT_PROT_NONE;
-		goto out;
+		return attr;
 	}
 
 	if (!(prot & KVM_PGTABLE_PROT_X))
 		attr |= KVM_PTE_LEAF_ATTR_HI_S2_XN;
 	else if (device)
-		return -EINVAL;
+		return 0;
 
 	if (prot & KVM_PGTABLE_PROT_R)
 		attr |= KVM_PTE_LEAF_ATTR_LO_S2_S2AP_R;
@@ -523,9 +522,7 @@ static int stage2_map_set_prot_attr(enum kvm_pgtable_prot prot,
 	attr |= FIELD_PREP(KVM_PTE_LEAF_ATTR_LO_S2_SH, sh);
 	attr |= KVM_PTE_LEAF_ATTR_LO_S2_AF;
 
-out:
-	data->attr = attr;
-	return 0;
+	return attr;
 }
 
 static int stage2_map_walker_try_leaf(u64 addr, u64 end, u32 level,
@@ -708,9 +705,9 @@ int kvm_pgtable_stage2_map(struct kvm_pgtable *pgt, u64 addr, u64 size,
 		.arg		= &map_data,
 	};
 
-	ret = stage2_map_set_prot_attr(prot, &map_data);
-	if (ret)
-		return ret;
+	map_data.attr = stage2_get_prot_attr(prot);
+	if (!map_data.attr)
+		return -EINVAL;
 
 	ret = kvm_pgtable_walk(pgt, addr, size, &walker);
 	dsb(ishst);
-- 
2.30.1.766.gb4fecdf3b7-goog