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>
diff --git a/arch/i386/xen/smp.c b/arch/i386/xen/smp.c
index a620918..557b8e2 100644
--- a/arch/i386/xen/smp.c
+++ b/arch/i386/xen/smp.c
@@ -142,8 +142,6 @@
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 @@
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 @@
init_gdt(cpu);
per_cpu(current_task, cpu) = idle;
- xen_vcpu_setup(cpu);
irq_ctx_init(cpu);
xen_setup_timer(cpu);