[PATCH v14 10/10] arm64: Add kvm capability check extension for ptp_kvm

[Jianyong Wu]

Let userspace check if there is kvm ptp service in host.
Before VMs migrate to another host, VMM may check if this
cap is available to determine the next behavior.

Signed-off-by: Jianyong Wu <jianyong.wu@xxxxxxx>
Suggested-by: Marc Zyngier <maz@xxxxxxxxxx>
---
 arch/arm64/kvm/arm.c     | 4 ++++
 include/uapi/linux/kvm.h | 1 +
 2 files changed, 5 insertions(+)

diff --git a/arch/arm64/kvm/arm.c b/arch/arm64/kvm/arm.c
index 691d21e4c717..8e99ad2f0b83 100644
--- a/arch/arm64/kvm/arm.c
+++ b/arch/arm64/kvm/arm.c
@@ -178,6 +178,10 @@ int kvm_vm_ioctl_check_extension(struct kvm *kvm, long ext)
 	case KVM_CAP_ARM_IRQ_LINE_LAYOUT_2:
 	case KVM_CAP_ARM_NISV_TO_USER:
 	case KVM_CAP_ARM_INJECT_EXT_DABT:
+
+#ifdef CONFIG_ARM64_KVM_PTP_HOST
+	case KVM_CAP_ARM_PTP_KVM:
+#endif
 		r = 1;
 		break;
 	case KVM_CAP_ARM_SET_DEVICE_ADDR:
diff --git a/include/uapi/linux/kvm.h b/include/uapi/linux/kvm.h
index f6d86033c4fa..dd58ebe0daf5 100644
--- a/include/uapi/linux/kvm.h
+++ b/include/uapi/linux/kvm.h
@@ -1035,6 +1035,7 @@ struct kvm_ppc_resize_hpt {
 #define KVM_CAP_LAST_CPU 184
 #define KVM_CAP_SMALLER_MAXPHYADDR 185
 #define KVM_CAP_S390_DIAG318 186
+#define KVM_CAP_ARM_PTP_KVM 187
 
 #ifdef KVM_CAP_IRQ_ROUTING
 
-- 
2.17.1