This supports SDEI_EVENT_CONTEXT hypercall. It's used by the guest
to retrieve the registers (R0 - R17) in the preempted context
in the SDEI event handler. The preempted context is saved prior to
servicing or handling the SDEI event and restored after that.
Signed-off-by: Gavin Shan <gshan@xxxxxxxxxx>
---
arch/arm64/kvm/sdei.c | 30 ++++++++++++++++++++++++++++++
1 file changed, 30 insertions(+)
diff --git a/arch/arm64/kvm/sdei.c b/arch/arm64/kvm/sdei.c
index 4ab58f264992..4488d3f044f2 100644
--- a/arch/arm64/kvm/sdei.c
+++ b/arch/arm64/kvm/sdei.c
@@ -297,6 +297,34 @@ static unsigned long hypercall_enable(struct kvm_vcpu *vcpu, bool enable)
return ret;
}
+static unsigned long hypercall_context(struct kvm_vcpu *vcpu)
+{
+ struct kvm_sdei_vcpu *vsdei = vcpu->arch.sdei;
+ struct kvm_sdei_vcpu_regs_state *regs;
+ unsigned long param_id = smccc_get_arg1(vcpu);
+ unsigned long ret = SDEI_SUCCESS;
+
+ spin_lock(&vsdei->lock);
+
+ /* Check if the pending event exists */
+ if (!vsdei->critical_event && !vsdei->normal_event) {
+ ret = SDEI_DENIED;
+ goto unlock;
+ }
+
+ /* Fetch the requested register */
+ regs = vsdei->critical_event ? &vsdei->state.critical_regs :
+ &vsdei->state.normal_regs;
+ if (param_id < ARRAY_SIZE(regs->regs))
+ ret = regs->regs[param_id];
+ else
+ ret = SDEI_INVALID_PARAMETERS;
+
+unlock:
+ spin_unlock(&vsdei->lock);
+ return ret;
+}
+
int kvm_sdei_hypercall(struct kvm_vcpu *vcpu)
{
struct kvm *kvm = vcpu->kvm;
@@ -333,6 +361,8 @@ int kvm_sdei_hypercall(struct kvm_vcpu *vcpu)
ret = hypercall_enable(vcpu, false);
break;
case SDEI_1_0_FN_SDEI_EVENT_CONTEXT:
+ ret = hypercall_context(vcpu);
+ break;
case SDEI_1_0_FN_SDEI_EVENT_COMPLETE:
case SDEI_1_0_FN_SDEI_EVENT_COMPLETE_AND_RESUME:
case SDEI_1_0_FN_SDEI_EVENT_UNREGISTER:
--
2.23.0
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