Check that a protected VM is not setting any of the unsupported
features when it's created.
Signed-off-by: Fuad Tabba <ta...@google.com>
---
arch/arm64/kvm/pkvm.c | 31 +++++++++++++++++++++++++++++++
1 file changed, 31 insertions(+)
diff --git a/arch/arm64/kvm/pkvm.c b/arch/arm64/kvm/pkvm.c
index cf624350fb27..5e58d604faec 100644
--- a/arch/arm64/kvm/pkvm.c
+++ b/arch/arm64/kvm/pkvm.c
@@ -88,10 +88,41 @@ static void pkvm_teardown_firmware_slot(struct kvm *kvm)
kvm->arch.pkvm.firmware_slot = NULL;
}
+/*
+ * Check that no unsupported features are enabled for the protected VM's vcpus.
+ *
+ * Return 0 if all features enabled for all vcpus are supported, or -EINVAL if
+ * one or more vcpus has one or more unsupported features.
+ */
+static int pkvm_check_features(struct kvm *kvm)
+{
+ int i;
+ const struct kvm_vcpu *vcpu;
+
+ kvm_for_each_vcpu(i, vcpu, kvm) {
+ /*
+ * No support for:
+ * - AArch32 state for protected VMs
+ * - Performance Monitoring
+ * - Scalable Vectors
+ */
+ if (test_bit(KVM_ARM_VCPU_EL1_32BIT, vcpu->arch.features) ||
+ test_bit(KVM_ARM_VCPU_PMU_V3, vcpu->arch.features) ||
+ test_bit(KVM_ARM_VCPU_SVE, vcpu->arch.features))
+ return -EINVAL;
+ }
+
+ return 0;
+}
+
static int pkvm_enable(struct kvm *kvm, u64 slotid)
{
int ret;
+ ret = pkvm_check_features(kvm);
+ if (ret)
+ return ret;
+
ret = pkvm_init_firmware_slot(kvm, slotid);
if (ret)
return ret;
--
2.32.0.rc1.229.g3e70b5a671-goog
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