[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 <gs...@redhat.com>
---
 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