[PATCH v15 21/37] KVM: arm64: CCA: Set RIPAS of initial memslots

[Steven Price <steven.price@arm.com>]

The memory which the realm guest accesses must be set to RIPAS_RAM.
Iterate over the memslots and set all gmem memslots to RIPAS_RAM.

Signed-off-by: Steven Price <steven.price@arm.com>
---
New patch for v12.
---
 arch/arm64/kvm/rmi.c | 38 ++++++++++++++++++++++++++++++++++++++
 1 file changed, 38 insertions(+)

diff --git a/arch/arm64/kvm/rmi.c b/arch/arm64/kvm/rmi.c
index e2b4c64e982d..1e6c04145f6c 100644
--- a/arch/arm64/kvm/rmi.c
+++ b/arch/arm64/kvm/rmi.c
@@ -757,6 +757,14 @@ static int realm_set_ipa_state(struct kvm_vcpu *vcpu,
 	return ret;
 }
 
+static int realm_init_ipa_state(struct kvm *kvm,
+				unsigned long gfn,
+				unsigned long pages)
+{
+	return ripas_change(kvm, NULL, gfn_to_gpa(gfn), gfn_to_gpa(gfn + pages),
+			    RIPAS_INIT, NULL);
+}
+
 static int realm_ensure_created(struct kvm *kvm)
 {
 	lockdep_assert_held(&kvm->arch.config_lock);
@@ -775,6 +783,32 @@ static int realm_ensure_created(struct kvm *kvm)
 	return realm_create_rd(kvm);
 }
 
+static int set_ripas_of_protected_regions(struct kvm *kvm)
+{
+	struct kvm_memslots *slots;
+	struct kvm_memory_slot *memslot;
+	int idx, bkt;
+	int ret = 0;
+
+	lockdep_assert_held(&kvm->arch.config_lock);
+
+	idx = srcu_read_lock(&kvm->srcu);
+
+	slots = kvm_memslots(kvm);
+	kvm_for_each_memslot(memslot, bkt, slots) {
+		if (!kvm_slot_has_gmem(memslot))
+			continue;
+
+		ret = realm_init_ipa_state(kvm, memslot->base_gfn,
+					   memslot->npages);
+		if (ret)
+			break;
+	}
+	srcu_read_unlock(&kvm->srcu, idx);
+
+	return ret;
+}
+
 int kvm_arm_rmi_populate(struct kvm *kvm,
 			 struct kvm_arm_rmi_populate *args)
 {
@@ -1045,6 +1079,10 @@ int kvm_activate_realm(struct kvm *kvm)
 			return ret;
 	}
 
+	ret = set_ripas_of_protected_regions(kvm);
+	if (ret)
+		return ret;
+
 	ret = rmi_realm_activate(virt_to_phys(realm->rd));
 	if (ret)
 		return -ENXIO;
-- 
2.43.0