[Crash-utility] [PATCH 3/7] Fix missing 'init_tss' symbol in Xen4

[Petr Tesarik]

In Xen4, init_tss is a per-cpu symbol. Without this patch, crash fails
on Xen4 hypervisor dumps during initialization with
'crash: cannot resolve "init_tss"'.

Signed-off-by: Petr Tesarik <ptesarik at suse.cz>

---
 xen_hyper.c |   15 +++++++++++++--
 1 file changed, 13 insertions(+), 2 deletions(-)

--- a/xen_hyper.c
+++ b/xen_hyper.c
@@ -319,6 +319,7 @@ xen_hyper_x86_pcpu_init(void)
 	struct xen_hyper_pcpu_context *pcc;
 	char *buf, *bp;
 	int i, cpuid;
+	int flag;
 
 	XEN_HYPER_MEMBER_OFFSET_INIT(cpu_info_guest_cpu_user_regs, "cpu_info", 
"guest_cpu_user_regs");
 	XEN_HYPER_MEMBER_OFFSET_INIT(cpu_info_processor_id, "cpu_info", 
"processor_id");
@@ -330,11 +331,21 @@ xen_hyper_x86_pcpu_init(void)
 
 	/* get physical cpu context */
 	xen_hyper_alloc_pcpu_context_space(XEN_HYPER_MAX_CPUS());
-	init_tss_base = symbol_value("init_tss");
+	if (symbol_exists("per_cpu__init_tss")) {
+		init_tss_base = symbol_value("per_cpu__init_tss");
+		flag = TRUE;
+	} else {
+		init_tss_base = symbol_value("init_tss");
+		flag = FALSE;
+	}
 	buf = GETBUF(XEN_HYPER_SIZE(tss_struct));	
 	for_cpu_indexes(i, cpuid)
 	{
-		init_tss = init_tss_base + XEN_HYPER_SIZE(tss_struct) * cpuid;
+		if (flag)
+			init_tss = xen_hyper_per_cpu(init_tss_base, cpuid);
+		else
+			init_tss = init_tss_base +
+				XEN_HYPER_SIZE(tss_struct) * cpuid;
 		if (!readmem(init_tss, KVADDR, buf,
 			XEN_HYPER_SIZE(tss_struct), "init_tss", RETURN_ON_ERROR)) {
 			error(FATAL, "cannot read init_tss.\n");