add REDIRECT

hc

2024-10-09 05e59e5fb0064c97a1c10921ecd549f2d4a58565

 kernel/drivers/hv/channel_mgmt.c
..
..
@@ -765,11 +765,22 @@
765
765
 		if (completion_done(&vmbus_connection.unload_event))
766
766
 			goto completed;
767
767
 
768
-		for_each_online_cpu(cpu) {
768
+		for_each_present_cpu(cpu) {
769
769
 			struct hv_per_cpu_context *hv_cpu
770
770
 				= per_cpu_ptr(hv_context.cpu_context, cpu);
771
771
 
772
+			/*
773
+			 * In a CoCo VM the synic_message_page is not allocated
774
+			 * in hv_synic_alloc(). Instead it is set/cleared in
775
+			 * hv_synic_enable_regs() and hv_synic_disable_regs()
776
+			 * such that it is set only when the CPU is online. If
777
+			 * not all present CPUs are online, the message page
778
+			 * might be NULL, so skip such CPUs.
779
+			 */
772
780
 			page_addr = hv_cpu->synic_message_page;
781
+			if (!page_addr)
782
+				continue;
783
+
773
784
 			msg = (struct hv_message *)page_addr
774
785
 				+ VMBUS_MESSAGE_SINT;
775
786
 
..
..
@@ -803,11 +814,14 @@
803
814
 	 * maybe-pending messages on all CPUs to be able to receive new
804
815
 	 * messages after we reconnect.
805
816
 	 */
806
-	for_each_online_cpu(cpu) {
817
+	for_each_present_cpu(cpu) {
807
818
 		struct hv_per_cpu_context *hv_cpu
808
819
 			= per_cpu_ptr(hv_context.cpu_context, cpu);
809
820
 
810
821
 		page_addr = hv_cpu->synic_message_page;
822
+		if (!page_addr)
823
+			continue;
824
+
811
825
 		msg = (struct hv_message *)page_addr + VMBUS_MESSAGE_SINT;
812
826
 		msg->header.message_type = HVMSG_NONE;
813
827
 	}