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Commit 38341432 authored by Jeremy Fitzhardinge's avatar Jeremy Fitzhardinge Committed by H. Peter Anvin
Browse files

xen: setup percpu data pointers 



We need to access percpu data fairly early, so set up the percpu
registers as soon as possible.  We only need to load the appropriate
segment register.  We already have a GDT, but its hard to change it
early because we need to manipulate the pagetable to do so, and that
hasn't been set up yet.

Also, set the kernel stack when bringing up secondary CPUs.  If we
don't they all end up sharing the same stack...

Signed-off-by: default avatarJeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
Signed-off-by: default avatarH. Peter Anvin <hpa@linux.intel.com>
parent 327641da

arch/x86/xen/enlighten.c

+14 −1
Original line number Diff line number Diff line
@@ -66,6 +66,8 @@ EXPORT_SYMBOL_GPL(xen_start_info); 


struct shared_info xen_dummy_shared_info;



void *xen_initial_gdt;



/*

 * Point at some empty memory to start with. We map the real shared_info

 * page as soon as fixmap is up and running.
@@ -917,8 +919,19 @@ asmlinkage void __init xen_start_kernel(void) 
	have_vcpu_info_placement = 0;

#endif



	/* setup percpu state */

#ifdef CONFIG_X86_64

	/*

	 * Setup percpu state.  We only need to do this for 64-bit

	 * because 32-bit already has %fs set properly.

	 */

	load_percpu_segment(0);

#endif

	/*

	 * The only reliable way to retain the initial address of the

	 * percpu gdt_page is to remember it here, so we can go and

	 * mark it RW later, when the initial percpu area is freed.

	 */

	xen_initial_gdt = &per_cpu(gdt_page, 0);



	xen_smp_init();

arch/x86/xen/smp.c

+4 −2
Original line number Diff line number Diff line
@@ -170,8 +170,7 @@ static void __init xen_smp_prepare_boot_cpu(void) 


	/* We've switched to the "real" per-cpu gdt, so make sure the

	   old memory can be recycled */

	make_lowmem_page_readwrite(__per_cpu_load +

				   (unsigned long)&per_cpu_var(gdt_page));

	make_lowmem_page_readwrite(xen_initial_gdt);



	xen_setup_vcpu_info_placement();

}
@@ -287,6 +286,9 @@ static int __cpuinit xen_cpu_up(unsigned int cpu) 
	irq_ctx_init(cpu);

#else

	clear_tsk_thread_flag(idle, TIF_FORK);

	per_cpu(kernel_stack, cpu) =

		(unsigned long)task_stack_page(idle) -

		KERNEL_STACK_OFFSET + THREAD_SIZE;

#endif

	xen_setup_timer(cpu);

	xen_init_lock_cpu(cpu);

arch/x86/xen/xen-ops.h

+2 −0
Original line number Diff line number Diff line
@@ -10,6 +10,8 @@ 
extern const char xen_hypervisor_callback[];

extern const char xen_failsafe_callback[];



extern void *xen_initial_gdt;



struct trap_info;

void xen_copy_trap_info(struct trap_info *traps);