Two fixes for the Xen hypervisor; the first fixes a bug seen

with Xen 4.11.0 during initialization, which fails with the error
message "crash: invalid kernel virtual address: <address> type:
fill_pcpu_struct", followed by "WARNING: cannot fill pcpu_struct"
and "crash: cannot read cpu_info".  The second fix prevents a
segmentation violation associated with a crash-7.1.1 commit that
addressed the Xen 4.5.0 hypervisor symbol name change from
"dom0" to "hardware_domain".
(dietmar.hahn@ts.fujitsu.com)

x86_64.c

@@ -7903,7 +7903,11 @@ x86_64_init_hyper(int when)
 	case POST_GDB:
 		XEN_HYPER_STRUCT_SIZE_INIT(cpuinfo_x86, "cpuinfo_x86");
 		XEN_HYPER_STRUCT_SIZE_INIT(tss_struct, "tss_struct");
-		XEN_HYPER_ASSIGN_OFFSET(tss_struct_rsp0) = MEMBER_OFFSET("tss_struct", "__blh") + sizeof(short unsigned int);
+		if (MEMBER_EXISTS("tss_struct", "__blh")) {
+			XEN_HYPER_ASSIGN_OFFSET(tss_struct_rsp0) = MEMBER_OFFSET("tss_struct", "__blh") + sizeof(short unsigned int);
+		} else {
+			XEN_HYPER_ASSIGN_OFFSET(tss_struct_rsp0) = MEMBER_OFFSET("tss_struct", "rsp0");
+		}
 		XEN_HYPER_MEMBER_OFFSET_INIT(tss_struct_ist, "tss_struct", "ist");
 		if (symbol_exists("cpu_data")) {
 			xht->cpu_data_address = symbol_value("cpu_data");

xen_hyper.c

@@ -1060,8 +1060,8 @@ xen_hyper_get_domains(void)
 	long domain_next_in_list;
 	int i, j;
 
-	if (!try_get_symbol_data("dom0", sizeof(void *), &domain))
-		get_symbol_data("hardware_domain", sizeof(void *), &domain);
+	if (!try_get_symbol_data("hardware_domain", sizeof(void *), &domain))
+		get_symbol_data("dom0", sizeof(void *), &domain);
 
 	domain_next_in_list = MEMBER_OFFSET("domain", "next_in_list");
 	i = 0;
@@ -1103,8 +1103,8 @@ xen_hyper_get_domain_next(int mod, ulong *next)
 		if (xhdt->dom0) {
 			*next = xhdt->dom0->domain;
 		} else {
-			if (!try_get_symbol_data("dom0", sizeof(void *), next))
-				get_symbol_data("hardware_domain", sizeof(void *), next);
+			if (!try_get_symbol_data("hardware_domain", sizeof(void *), next))
+				get_symbol_data("dom0", sizeof(void *), next);
 		}
 		return xhdt->domain_struct;
 		break;