Implement a facility for dynamic per-cpu variables.

 - Modules and kernel code alike may use DPCPU_DEFINE(),
   DPCPU_GET(), DPCPU_SET(), etc. akin to the statically defined
   PCPU_*.  Requires only one extra instruction more than PCPU_* and is
   virtually the same as __thread for builtin and much faster for shared
   objects.  DPCPU variables can be initialized when defined.
 - Modules are supported by relocating the module's per-cpu linker set
   over space reserved in the kernel.  Modules may fail to load if there
   is insufficient space available.
 - Track space available for modules with a one-off extent allocator.
   Free may block for memory to allocate space for an extent.

Reviewed by:    jhb, rwatson, kan, sam, grehan, marius, marcel, stas

1 files changed, 1 insertions, 0 deletions

diff --git a/sys/i386/xen/mp_machdep.c b/sys/i386/xen/mp_machdep.c
index f16d25f..3aa03ce 100644
--- a/sys/i386/xen/mp_machdep.c
+++ b/sys/i386/xen/mp_machdep.c
@@ -744,6 +744,7 @@ start_all_aps(void)
 		/* Get per-cpu data */
 		pc = &__pcpu[bootAP];
 		pcpu_init(pc, bootAP, sizeof(struct pcpu));
+		dpcpu_init((void *)kmem_alloc(kernel_map, DPCPU_SIZE), bootAP);
 		pc->pc_apic_id = cpu_apic_ids[bootAP];
 		pc->pc_prvspace = pc;
 		pc->pc_curthread = 0;