[PATCH v4 11/21] KVM: arm64: Support SDEI_PE_{MASK, UNMASK} hypercall

[Gavin Shan]

This supports SDEI_PE_{MASK, UNMASK} hypercall. They are used by
the guest to stop the specific vCPU from receiving SDEI events.

Signed-off-by: Gavin Shan <gshan@xxxxxxxxxx>
---
 arch/arm64/kvm/sdei.c | 35 +++++++++++++++++++++++++++++++++++
 1 file changed, 35 insertions(+)

diff --git a/arch/arm64/kvm/sdei.c b/arch/arm64/kvm/sdei.c
index 458695c2394f..3fb33258b494 100644
--- a/arch/arm64/kvm/sdei.c
+++ b/arch/arm64/kvm/sdei.c
@@ -551,6 +551,37 @@ static unsigned long kvm_sdei_hypercall_route(struct kvm_vcpu *vcpu)
 	return ret;
 }
 
+static unsigned long kvm_sdei_hypercall_mask(struct kvm_vcpu *vcpu,
+					     bool mask)
+{
+	struct kvm *kvm = vcpu->kvm;
+	struct kvm_sdei_kvm *ksdei = kvm->arch.sdei;
+	struct kvm_sdei_vcpu *vsdei = vcpu->arch.sdei;
+	unsigned long ret = SDEI_SUCCESS;
+
+	/* Sanity check */
+	if (!(ksdei && vsdei)) {
+		ret = SDEI_NOT_SUPPORTED;
+		goto out;
+	}
+
+	spin_lock(&vsdei->lock);
+
+	/* Check the state */
+	if (mask == vsdei->state.masked) {
+		ret = SDEI_DENIED;
+		goto unlock;
+	}
+
+	/* Update the state */
+	vsdei->state.masked = mask ? 1 : 0;
+
+unlock:
+	spin_unlock(&vsdei->lock);
+out:
+	return ret;
+}
+
 int kvm_sdei_hypercall(struct kvm_vcpu *vcpu)
 {
 	u32 func = smccc_get_function(vcpu);
@@ -588,7 +619,11 @@ int kvm_sdei_hypercall(struct kvm_vcpu *vcpu)
 		ret = kvm_sdei_hypercall_route(vcpu);
 		break;
 	case SDEI_1_0_FN_SDEI_PE_MASK:
+		ret = kvm_sdei_hypercall_mask(vcpu, true);
+		break;
 	case SDEI_1_0_FN_SDEI_PE_UNMASK:
+		ret = kvm_sdei_hypercall_mask(vcpu, false);
+		break;
 	case SDEI_1_0_FN_SDEI_INTERRUPT_BIND:
 	case SDEI_1_0_FN_SDEI_INTERRUPT_RELEASE:
 	case SDEI_1_0_FN_SDEI_PRIVATE_RESET:
-- 
2.23.0