Re: [PATCH v4 29/34] KVM: arm64: Refactor stage2_map_set_prot_attr()

On Thursday 11 Mar 2021 at 18:48:36 (+0000), Will Deacon wrote:

On Wed, Mar 10, 2021 at 05:57:46PM +0000, Quentin Perret wrote:

quoted

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 <redacted>
---
 arch/arm64/kvm/hyp/pgtable.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/arch/arm64/kvm/hyp/pgtable.c b/arch/arm64/kvm/hyp/pgtable.c
index e4670b639726..c16e0306dd9a 100644
--- a/arch/arm64/kvm/hyp/pgtable.c
+++ b/arch/arm64/kvm/hyp/pgtable.c

@@ -489,8 +489,7 @@ 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 int stage2_set_prot_attr(enum kvm_pgtable_prot prot, kvm_pte_t *ptep)
 {
 	bool device = prot & KVM_PGTABLE_PROT_DEVICE;
 	kvm_pte_t attr = device ? PAGE_S2_MEMATTR(DEVICE_nGnRE) :

@@ -510,7 +509,8 @@ 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;
-	data->attr = attr;
+	*ptep = attr;
+
 	return 0;
 }
 

@@ -728,7 +728,7 @@ 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);
+	ret = stage2_set_prot_attr(prot, &map_data.attr);
 	if (ret)
 		return ret;

(nit: this is now different to hyp_map_set_prot_attr() -- can we do the same
thing there, please?)

Will do.

Thanks,
Quentin

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