[PATCH v2 03/21] KVM: arm64: Support SDEI_VERSION hypercall

[Gavin Shan]

This supports SDEI_VERSION hypercall by returning v1.0.0 simply
when the functionality is supported on the VM and vCPU.

Signed-off-by: Gavin Shan <gs...@redhat.com>
---
 arch/arm64/kvm/sdei.c | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)

diff --git a/arch/arm64/kvm/sdei.c b/arch/arm64/kvm/sdei.c
index ab330b74a965..aa9485f076a9 100644
--- a/arch/arm64/kvm/sdei.c
+++ b/arch/arm64/kvm/sdei.c
@@ -70,6 +70,22 @@ static void kvm_sdei_remove_vcpu_events(struct kvm_vcpu 
*vcpu)
        }
 }
 
+static unsigned long kvm_sdei_hypercall_version(struct kvm_vcpu *vcpu)
+{
+       struct kvm *kvm = vcpu->kvm;
+       struct kvm_sdei_kvm *ksdei = kvm->arch.sdei;
+       struct kvm_sdei_vcpu *vsdei = vcpu->arch.sdei;
+       unsigned long ret = SDEI_NOT_SUPPORTED;
+
+       if (!(ksdei && vsdei))
+               return ret;
+
+       /* v1.0.0 */
+       ret = (1UL << SDEI_VERSION_MAJOR_SHIFT);
+
+       return ret;
+}
+
 int kvm_sdei_hypercall(struct kvm_vcpu *vcpu)
 {
        u32 func = smccc_get_function(vcpu);
@@ -78,6 +94,8 @@ int kvm_sdei_hypercall(struct kvm_vcpu *vcpu)
 
        switch (func) {
        case SDEI_1_0_FN_SDEI_VERSION:
+               ret = kvm_sdei_hypercall_version(vcpu);
+               break;
        case SDEI_1_0_FN_SDEI_EVENT_REGISTER:
        case SDEI_1_0_FN_SDEI_EVENT_ENABLE:
        case SDEI_1_0_FN_SDEI_EVENT_DISABLE:
-- 
2.23.0