xen/trace: add segment desc tracing

Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>

arch/x86/xen/enlighten.c

@@ -341,6 +341,8 @@ static void xen_set_ldt(const void *addr, unsigned entries)
 	struct mmuext_op *op;
 	struct multicall_space mcs = xen_mc_entry(sizeof(*op));
 
+	trace_xen_cpu_set_ldt(addr, entries);
+
 	op = mcs.args;
 	op->cmd = MMUEXT_SET_LDT;
 	op->arg1.linear_addr = (unsigned long)addr;
@@ -496,6 +498,8 @@ static void xen_write_ldt_entry(struct desc_struct *dt, int entrynum,
 	xmaddr_t mach_lp = arbitrary_virt_to_machine(&dt[entrynum]);
 	u64 entry = *(u64 *)ptr;
 
+	trace_xen_cpu_write_ldt_entry(dt, entrynum, entry);
+
 	preempt_disable();
 
 	xen_mc_flush();
@@ -565,6 +569,8 @@ static void xen_write_idt_entry(gate_desc *dt, int entrynum, const gate_desc *g)
 	unsigned long p = (unsigned long)&dt[entrynum];
 	unsigned long start, end;
 
+	trace_xen_cpu_write_idt_entry(dt, entrynum, g);
+
 	preempt_disable();
 
 	start = __this_cpu_read(idt_desc.address);
@@ -619,6 +625,8 @@ static void xen_load_idt(const struct desc_ptr *desc)
 	static DEFINE_SPINLOCK(lock);
 	static struct trap_info traps[257];
 
+	trace_xen_cpu_load_idt(desc);
+
 	spin_lock(&lock);
 
 	__get_cpu_var(idt_desc) = *desc;
@@ -637,6 +645,8 @@ static void xen_load_idt(const struct desc_ptr *desc)
 static void xen_write_gdt_entry(struct desc_struct *dt, int entry,
 				const void *desc, int type)
 {
+	trace_xen_cpu_write_gdt_entry(dt, entry, desc, type);
+
 	preempt_disable();
 
 	switch (type) {
@@ -665,6 +675,8 @@ static void xen_write_gdt_entry(struct desc_struct *dt, int entry,
 static void __init xen_write_gdt_entry_boot(struct desc_struct *dt, int entry,
 					    const void *desc, int type)
 {
+	trace_xen_cpu_write_gdt_entry(dt, entry, desc, type);
+
 	switch (type) {
 	case DESC_LDT:
 	case DESC_TSS:
@@ -684,7 +696,9 @@ static void __init xen_write_gdt_entry_boot(struct desc_struct *dt, int entry,
 static void xen_load_sp0(struct tss_struct *tss,
 			 struct thread_struct *thread)
 {
-	struct multicall_space mcs = xen_mc_entry(0);
+	struct multicall_space mcs;
+
+	mcs = xen_mc_entry(0);
 	MULTI_stack_switch(mcs.mc, __KERNEL_DS, thread->sp0);
 	xen_mc_issue(PARAVIRT_LAZY_CPU);
 }

include/trace/events/xen.h

@@ -405,6 +405,81 @@ TRACE_EVENT(xen_mmu_pgd_unpin,
 	    TP_printk("mm %p pgd %p", __entry->mm, __entry->pgd)
 	);
 
+/* CPU */
+TRACE_EVENT(xen_cpu_write_ldt_entry,
+	    TP_PROTO(struct desc_struct *dt, int entrynum, u64 desc),
+	    TP_ARGS(dt, entrynum, desc),
+	    TP_STRUCT__entry(
+		    __field(struct desc_struct *, dt)
+		    __field(int, entrynum)
+		    __field(u64, desc)
+		    ),
+	    TP_fast_assign(__entry->dt = dt;
+			   __entry->entrynum = entrynum;
+			   __entry->desc = desc;
+		    ),
+	    TP_printk("dt %p  entrynum %d  entry %016llx",
+		      __entry->dt, __entry->entrynum,
+		      (unsigned long long)__entry->desc)
+	);
+
+TRACE_EVENT(xen_cpu_write_idt_entry,
+	    TP_PROTO(gate_desc *dt, int entrynum, const gate_desc *ent),
+	    TP_ARGS(dt, entrynum, ent),
+	    TP_STRUCT__entry(
+		    __field(gate_desc *, dt)
+		    __field(int, entrynum)
+		    ),
+	    TP_fast_assign(__entry->dt = dt;
+			   __entry->entrynum = entrynum;
+		    ),
+	    TP_printk("dt %p  entrynum %d",
+		      __entry->dt, __entry->entrynum)
+	);
+
+TRACE_EVENT(xen_cpu_load_idt,
+	    TP_PROTO(const struct desc_ptr *desc),
+	    TP_ARGS(desc),
+	    TP_STRUCT__entry(
+		    __field(unsigned long, addr)
+		    ),
+	    TP_fast_assign(__entry->addr = desc->address),
+	    TP_printk("addr %lx", __entry->addr)
+	);
+
+TRACE_EVENT(xen_cpu_write_gdt_entry,
+	    TP_PROTO(struct desc_struct *dt, int entrynum, const void *desc, int type),
+	    TP_ARGS(dt, entrynum, desc, type),
+	    TP_STRUCT__entry(
+		    __field(u64, desc)
+		    __field(struct desc_struct *, dt)
+		    __field(int, entrynum)
+		    __field(int, type)
+		    ),
+	    TP_fast_assign(__entry->dt = dt;
+			   __entry->entrynum = entrynum;
+			   __entry->desc = *(u64 *)desc;
+			   __entry->type = type;
+		    ),
+	    TP_printk("dt %p  entrynum %d  type %d  desc %016llx",
+		      __entry->dt, __entry->entrynum, __entry->type,
+		      (unsigned long long)__entry->desc)
+	);
+
+TRACE_EVENT(xen_cpu_set_ldt,
+	    TP_PROTO(const void *addr, unsigned entries),
+	    TP_ARGS(addr, entries),
+	    TP_STRUCT__entry(
+		    __field(const void *, addr)
+		    __field(unsigned, entries)
+		    ),
+	    TP_fast_assign(__entry->addr = addr;
+			   __entry->entries = entries),
+	    TP_printk("addr %p  entries %u",
+		      __entry->addr, __entry->entries)
+	);
+
+
 #endif /*  _TRACE_XEN_H */
 
 /* This part must be outside protection */