List supported feature flags in __xen_guest section.

Signed-off-bu: Ian Campbell <Ian.Campbell@XenSource.com>

linux-2.6-xen-sparse/arch/i386/kernel/head-xen.S

@@ -192,6 +192,9 @@ ENTRY(_stext)
 		utoa __PAGE_OFFSET
 	.ascii	",HYPERCALL_PAGE=0x"
 		utoa ((__PHYSICAL_START+HYPERCALL_PAGE_OFFSET)>>PAGE_SHIFT)
+	.ascii  ",FEATURES=writable_page_tables"
+	.ascii	         "|writable_descriptor_tables"
+	.ascii	         "|auto_translated_physmap"
 #ifdef CONFIG_X86_PAE
 	.ascii	",PAE=yes"
 #else

linux-2.6-xen-sparse/arch/x86_64/kernel/head-xen.S

@@ -148,5 +148,8 @@ gdt_end:
 	.ascii	",XEN_VER=xen-3.0"
 	.ascii	",VIRT_BASE=0x"; utoh __START_KERNEL_map
 	.ascii	",HYPERCALL_PAGE=0x"; utoh (phys_hypercall_page >> PAGE_SHIFT)
+	.ascii  ",FEATURES=writable_page_tables"
+	.ascii		 "|writable_descriptor_tables"
+	.ascii		 "|auto_translated_physmap"
 	.ascii	",LOADER=generic"
 	.byte	0