[PATCH v2 12/21] KVM: arm64: Support SDEI_{PRIVATE, SHARED}_RESET hypercall

[Gavin Shan]

This supports SDEI_{PRIVATE, SHARED}_RESET. They are used by the
guest to purge the private or shared SDEI events, which are registered
previously.

Signed-off-by: Gavin Shan <gshan@xxxxxxxxxx>
---
 arch/arm64/kvm/sdei.c | 29 +++++++++++++++++++++++++++++
 1 file changed, 29 insertions(+)

diff --git a/arch/arm64/kvm/sdei.c b/arch/arm64/kvm/sdei.c
index 3fb33258b494..62efee2b67b8 100644
--- a/arch/arm64/kvm/sdei.c
+++ b/arch/arm64/kvm/sdei.c
@@ -582,6 +582,29 @@ static unsigned long kvm_sdei_hypercall_mask(struct kvm_vcpu *vcpu,
 	return ret;
 }
 
+static unsigned long kvm_sdei_hypercall_reset(struct kvm_vcpu *vcpu,
+					      bool private)
+{
+	struct kvm *kvm = vcpu->kvm;
+	struct kvm_sdei_kvm *ksdei = kvm->arch.sdei;
+	struct kvm_sdei_vcpu *vsdei = vcpu->arch.sdei;
+	unsigned int mask = private ? (1 << SDEI_EVENT_TYPE_PRIVATE) :
+				      (1 << SDEI_EVENT_TYPE_SHARED);
+	unsigned long ret = SDEI_SUCCESS;
+
+	/* Sanity check */
+	if (!(ksdei && vsdei)) {
+		ret = SDEI_NOT_SUPPORTED;
+		goto out;
+	}
+
+	spin_lock(&ksdei->lock);
+	kvm_sdei_remove_kvm_events(kvm, mask, false);
+	spin_unlock(&ksdei->lock);
+out:
+	return ret;
+}
+
 int kvm_sdei_hypercall(struct kvm_vcpu *vcpu)
 {
 	u32 func = smccc_get_function(vcpu);
@@ -626,8 +649,14 @@ int kvm_sdei_hypercall(struct kvm_vcpu *vcpu)
 		break;
 	case SDEI_1_0_FN_SDEI_INTERRUPT_BIND:
 	case SDEI_1_0_FN_SDEI_INTERRUPT_RELEASE:
+		ret = SDEI_NOT_SUPPORTED;
+		break;
 	case SDEI_1_0_FN_SDEI_PRIVATE_RESET:
+		ret = kvm_sdei_hypercall_reset(vcpu, true);
+		break;
 	case SDEI_1_0_FN_SDEI_SHARED_RESET:
+		ret = kvm_sdei_hypercall_reset(vcpu, false);
+		break;
 	default:
 		ret = SDEI_NOT_SUPPORTED;
 	}
-- 
2.23.0