[PATCH v4 12/21] KVM: arm64: Support SDEI_{PRIVATE, SHARED}_RESET hypercall

Gavin Shan
2021-08-15T00:15:50Z

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@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