1 // SPDX-License-Identifier: GPL-2.0-only
31 	 * "from_guest" is only ever set to true by  in vmci_route()
38 	 * not touch a non-existent device.  in vmci_route()
42 	if (VMCI_INVALID_ID == dst->context)  in vmci_route()
46 	if (VMCI_HYPERVISOR_CONTEXT_ID == dst->context) {  in vmci_route()
63 		/* And we cannot send if the source is the host context. */  in vmci_route()
64 		if (VMCI_HOST_CONTEXT_ID == src->context)  in vmci_route()
70 		 * However, if they passed only an invalid context,  in vmci_route()
75 		if (VMCI_INVALID_ID == src->context &&  in vmci_route()
76 		    VMCI_INVALID_ID != src->resource)  in vmci_route()
77 			src->context = vmci_get_context_id();  in vmci_route()
84 	/* Anywhere to local client on host. */  in vmci_route()
85 	if (VMCI_HOST_CONTEXT_ID == dst->context) {  in vmci_route()
88 		 * guest, then we need to send it down to the host.  in vmci_route()
89 		 * Note that if we are also acting as a host then this  in vmci_route()
92 		 * way to remove any ambiguity from the host context.  in vmci_route()
94 		if (src->context == VMCI_HYPERVISOR_CONTEXT_ID) {  in vmci_route()
97 			 * host local communication. The hypervisor  in vmci_route()
98 			 * may send vmci event datagrams to the host  in vmci_route()
100 			 * an "outer host" through the guest device.  in vmci_route()
113 			if (VMCI_INVALID_ID == src->context)  in vmci_route()
114 				src->context = vmci_get_context_id();  in vmci_route()
116 			/* Send it from local client down to the host. */  in vmci_route()
123 		 * it is destined for a local client on this host, or  in vmci_route()
124 		 * it is from another local client on this host.  We  in vmci_route()
125 		 * must be acting as a host to service it.  in vmci_route()
130 		if (VMCI_INVALID_ID == src->context) {  in vmci_route()
134 			 * host context.  in vmci_route()
139 			src->context = VMCI_HOST_CONTEXT_ID;  in vmci_route()
148 	 * If we are acting as a host then this might be destined for  in vmci_route()
153 		if (vmci_ctx_exists(dst->context)) {  in vmci_route()
154 			if (VMCI_INVALID_ID == src->context) {  in vmci_route()
158 				 * Otherwise we can use the host  in vmci_route()
165 				src->context = VMCI_HOST_CONTEXT_ID;  in vmci_route()
166 			} else if (VMCI_CONTEXT_IS_VM(src->context) &&  in vmci_route()
167 				   src->context != dst->context) {  in vmci_route()
171 				 * communication destined for the host  in vmci_route()
184 			 * The host is attempting to reach a CID  in vmci_route()
196 	 * we need to send it down to the host. We do not filter out VM to  in vmci_route()
202 		 * Ending up here means we have neither guest nor host  in vmci_route()
209 	if (VMCI_INVALID_ID == src->context)  in vmci_route()
210 		src->context = vmci_get_context_id();  in vmci_route()
213 	 * Send it from local client down to the host, which will  in vmci_route()