This supports EVENT_CONTEXT hypercall. It's called inside the event
handler to retrieve the specified register in the saved or preempted
context.
* The request is rejected if no running event handler exists or the
parameter ID is out of range.
Signed-off-by: Gavin Shan <gshan@xxxxxxxxxx>
---
arch/arm64/kvm/sdei.c | 22 +++++++++++++++++++++-
1 file changed, 21 insertions(+), 1 deletion(-)
diff --git a/arch/arm64/kvm/sdei.c b/arch/arm64/kvm/sdei.c
index a4046e7b21d8..2fec2dcd02b0 100644
--- a/arch/arm64/kvm/sdei.c
+++ b/arch/arm64/kvm/sdei.c
@@ -44,7 +44,7 @@ static unsigned long event_register(struct kvm_vcpu *vcpu)
static unsigned long event_enable(struct kvm_vcpu *vcpu, bool enable)
{
struct kvm_sdei_vcpu *vsdei = vcpu->arch.sdei;
- unsigned int num = smccc_get_arg(vcpu, 1);
+ int num = smccc_get_arg(vcpu, 1);
if (num >= KVM_NR_SDEI_EVENTS)
return SDEI_INVALID_PARAMETERS;
@@ -68,6 +68,23 @@ static unsigned long event_enable(struct kvm_vcpu *vcpu, bool enable)
return SDEI_SUCCESS;
}
+static unsigned long event_context(struct kvm_vcpu *vcpu)
+{
+ struct kvm_sdei_vcpu *vsdei = vcpu->arch.sdei;
+ struct kvm_sdei_event_context *ctxt = &vsdei->ctxt;
+ unsigned int param_id = smccc_get_arg(vcpu, 1);
+
+ /* Reject if event handler isn't running */
+ if (!vsdei->running)
+ return SDEI_DENIED;
+
+ /* Reject if the parameter ID is out of range */
+ if (param_id >= ARRAY_SIZE(ctxt->regs))
+ return SDEI_INVALID_PARAMETERS;
+
+ return ctxt->regs[param_id];
+}
+
int kvm_sdei_call(struct kvm_vcpu *vcpu)
{
struct kvm_sdei_vcpu *vsdei = vcpu->arch.sdei;
@@ -95,6 +112,9 @@ int kvm_sdei_call(struct kvm_vcpu *vcpu)
case SDEI_1_0_FN_SDEI_EVENT_DISABLE:
ret = event_enable(vcpu, false);
break;
+ case SDEI_1_0_FN_SDEI_EVENT_CONTEXT:
+ ret = event_context(vcpu);
+ break;
default:
ret = SDEI_NOT_SUPPORTED;
}
--
2.23.0
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