2 files changed, 7 insertions, 1 deletions

diff --git a/arch/x86/xen/enlighten.c b/arch/x86/xen/enlighten.c
index bef941f61451..fe19c88a5029 100644
--- a/arch/x86/xen/enlighten.c
+++ b/arch/x86/xen/enlighten.c
@@ -1647,6 +1647,9 @@ asmlinkage void __init xen_start_kernel(void)
         have_vcpu_info_placement = 0;
 #endif
 
+        /* setup percpu state */
+        load_percpu_segment(0);
+
         xen_smp_init();
 
         /* Get mfn list */
diff --git a/arch/x86/xen/smp.c b/arch/x86/xen/smp.c
index 7735e3dd359c..88d5d5ec6beb 100644
--- a/arch/x86/xen/smp.c
+++ b/arch/x86/xen/smp.c
@@ -170,7 +170,8 @@ 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_var(gdt_page));
+        make_lowmem_page_readwrite(__per_cpu_load +
+                                   (unsigned long)&per_cpu_var(gdt_page));
 
         xen_setup_vcpu_info_placement();
 }
@@ -235,6 +236,8 @@ cpu_initialize_context(unsigned int cpu, struct task_struct *idle)
         ctxt->user_regs.ss = __KERNEL_DS;
 #ifdef CONFIG_X86_32
         ctxt->user_regs.fs = __KERNEL_PERCPU;
+#else
+        ctxt->gs_base_kernel = per_cpu_offset(cpu);
 #endif
         ctxt->user_regs.eip = (unsigned long)cpu_bringup_and_idle;
         ctxt->user_regs.eflags = 0x1000; /* IOPL_RING1 */