KVM: s390: Add KVM_CAP_S390_PROTECTED_DUMP

The capability indicates dump support for protected VMs.
Signed-off-by: Janosch Frank <frankja@linux.ibm.com>
Reviewed-by: Claudio Imbrenda <imbrenda@linux.ibm.com>
Link: https://lore.kernel.org/r/20220517163629.3443-9-frankja@linux.ibm.com
Message-Id: <20220517163629.3443-9-frankja@linux.ibm.com>
Signed-off-by: Christian Borntraeger <borntraeger@linux.ibm.com>

arch/s390/kvm/kvm-s390.c

@@ -606,6 +606,26 @@ int kvm_vm_ioctl_check_extension(struct kvm *kvm, long ext)
 	case KVM_CAP_S390_PROTECTED:
 		r = is_prot_virt_host();
 		break;
+	case KVM_CAP_S390_PROTECTED_DUMP: {
+		u64 pv_cmds_dump[] = {
+			BIT_UVC_CMD_DUMP_INIT,
+			BIT_UVC_CMD_DUMP_CONFIG_STOR_STATE,
+			BIT_UVC_CMD_DUMP_CPU,
+			BIT_UVC_CMD_DUMP_COMPLETE,
+		};
+		int i;
+
+		r = is_prot_virt_host();
+
+		for (i = 0; i < ARRAY_SIZE(pv_cmds_dump); i++) {
+			if (!test_bit_inv(pv_cmds_dump[i],
+					  (unsigned long *)&uv_info.inst_calls_list)) {
+				r = 0;
+				break;
+			}
+		}
+		break;
+	}
 	default:
 		r = 0;
 	}

include/uapi/linux/kvm.h

@@ -1157,6 +1157,7 @@ struct kvm_ppc_resize_hpt {
 #define KVM_CAP_VM_TSC_CONTROL 214
 #define KVM_CAP_SYSTEM_EVENT_DATA 215
 #define KVM_CAP_ARM_SYSTEM_SUSPEND 216
+#define KVM_CAP_S390_PROTECTED_DUMP 217
 
 #ifdef KVM_CAP_IRQ_ROUTING