Messages in this thread Patch in this message |  | | Subject | [PATCH 4/10] lguest: Initialize esp0 properly all the time | From | Rusty Russell <> | Date | Fri, 09 Feb 2007 20:18:13 +1100 |
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Whenever we schedule, __switch_to calls load_esp0 which does:
tss->esp0 = thread->esp0;
This is never initialized for the initial thread (ie "swapper"), so when we're scheduling that, we end up setting esp0 to 0. This is fine: the swapper never leaves ring 0, so this field is never used.
lguest, however, gets upset that we're trying to used an unmapped page as our kernel stack. Rather than work around it there, let's initialize it.
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
=================================================================== --- a/include/asm-i386/processor.h +++ b/include/asm-i386/processor.h @@ -421,6 +421,7 @@ struct thread_struct { }; #define INIT_THREAD { \ + .esp0 = sizeof(init_stack) + (long)&init_stack, \ .vm86_info = NULL, \ .sysenter_cs = __KERNEL_CS, \ .io_bitmap_ptr = NULL, \
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