xen: Place vcpu_info structure into per-cpu memory

An experimental patch for Xen allows guests to place their vcpu_info
structs anywhere.  We try to use this to place the vcpu_info into the
PDA, which allows direct access.

If this works, then switch to using direct access operations for
irq_enable, disable, save_fl and restore_fl.

Signed-off-by: Jeremy Fitzhardinge <jeremy@xensource.com>
Cc: Chris Wright <chrisw@sous-sol.org>
Cc: Keir Fraser <keir@xensource.com>

1 files changed, 2 insertions, 3 deletions

diff --git a/arch/i386/xen/smp.c b/arch/i386/xen/smp.c
index a620918f87ee..557b8e24706a 100644
--- a/arch/i386/xen/smp.c
+++ b/arch/i386/xen/smp.c
@@ -142,8 +142,6 @@ void __init xen_smp_prepare_boot_cpu(void)
         BUG_ON(smp_processor_id() != 0);
         native_smp_prepare_boot_cpu();
 
-        xen_vcpu_setup(0);
-
         /* We've switched to the "real" per-cpu gdt, so make sure the
            old memory can be recycled */
         make_lowmem_page_readwrite(&per_cpu__gdt_page);
@@ -152,6 +150,8 @@ void __init xen_smp_prepare_boot_cpu(void)
                 cpus_clear(cpu_sibling_map[cpu]);
                 cpus_clear(cpu_core_map[cpu]);
         }
+
+        xen_setup_vcpu_info_placement();
 }
 
 void __init xen_smp_prepare_cpus(unsigned int max_cpus)
@@ -262,7 +262,6 @@ int __cpuinit xen_cpu_up(unsigned int cpu)
 
         init_gdt(cpu);
         per_cpu(current_task, cpu) = idle;
-        xen_vcpu_setup(cpu);
         irq_ctx_init(cpu);
         xen_setup_timer(cpu);