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[Xen-devel] smp booting query

  • To: <xen-devel@xxxxxxxxxxxxxxxxxxx>
  • From: "Pradeep Singh, TLS-Chennai" <pradeep_s@xxxxxx>
  • Date: Fri, 9 Mar 2007 18:56:50 +0530
  • Delivery-date: Fri, 09 Mar 2007 05:29:42 -0800
  • List-id: Xen developer discussion <xen-devel.lists.xensource.com>
  • Thread-index: AcdiTpgHtZck4bcvThaAwANuoSj7FA==
  • Thread-topic: smp booting query

hi all,

My query is related to xen-3.0.3.

1. Xen does not supports SMP booting , right?
   Is it true for both domU and dom0?

2. This means start_secondary from x86_32.S is never called by the hypervisor, am i right?
   the SECONDARY_CPU_FLAG denotes a non boot CPU here i guess?

3. If it is a secondary processor xen jumps to start_secondary.

4. __start_xen is called irrespective of the processor. right?

5. On doing a nm x86_32.o , we get -

         U __bss_start
00000057 t __start
         U __start_xen
         U _end
00000000 T _stext
00000000 B cpu0_stack
000001ac T gdt
000001aa t gdt_descr
00001000 T gdt_table
00000000 B idle_pg_table
00000000 B idle_pg_table_l2
000001a4 T idt
000001a2 t idt_descr
         U idt_table
00000170 t ignore_int
0000015c t int_msg
         U mmu_cr4_features
000001b2 t nopaging_gdt_descr
00000031 t not_multiboot
00000010 t not_multiboot_msg
         U printf
00000190 T stack_start
00000000 T start
00000108 t start_paging
         U start_secondary
00000000 T stext

nm shows that start_secondary is there still.Are we using it somehow ?

or am i missing something here?

Thanks in advance?

Pradeep Singh
Member Technical Staff
Core Technology Divison
53, Greams Road.
HCL Technologies, Chennai


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