xen64: implement xen_load_gs_index()

[mirror_ubuntu-bionic-kernel.git] / arch / x86 / xen / enlighten.c

diff --git a/arch/x86/xen/enlighten.c b/arch/x86/xen/enlighten.c
index 9d94483b3b5e9c1877438c091a2a637b67b1460d..3b6b7fcf5b5534a8ebaf1b293b01f9f05a1a8a03 100644 (file)
--- a/arch/x86/xen/enlighten.c
+++ b/arch/x86/xen/enlighten.c
@@ -385,6 +385,14 @@ static void xen_load_tls(struct thread_struct *t, unsigned int cpu)
                loadsegment(gs, 0);
 }
 
+#ifdef CONFIG_X86_64
+static void xen_load_gs_index(unsigned int idx)
+{
+       if (HYPERVISOR_set_segment_base(SEGBASE_GS_USER_SEL, idx))
+               BUG();
+}
+#endif
+
 static void xen_write_ldt_entry(struct desc_struct *dt, int entrynum,
                                const void *ptr)
 {
@@ -1063,6 +1071,9 @@ static const struct pv_cpu_ops xen_cpu_ops __initdata = {
        .load_gdt = xen_load_gdt,
        .load_idt = xen_load_idt,
        .load_tls = xen_load_tls,
+#ifdef CONFIG_X86_64
+       .load_gs_index = xen_load_gs_index,
+#endif
 
        .store_gdt = native_store_gdt,
        .store_idt = native_store_idt,
@@ -1076,14 +1087,34 @@ static const struct pv_cpu_ops xen_cpu_ops __initdata = {
        .set_iopl_mask = xen_set_iopl_mask,
        .io_delay = xen_io_delay,
 
+       /* Xen takes care of %gs when switching to usermode for us */
+       .swapgs = paravirt_nop,
+
        .lazy_mode = {
                .enter = paravirt_enter_lazy_cpu,
                .leave = xen_leave_lazy,
        },
 };
 
+static void __init __xen_init_IRQ(void)
+{
+#ifdef CONFIG_X86_64
+       int i;
+
+       /* Create identity vector->irq map */
+       for(i = 0; i < NR_VECTORS; i++) {
+               int cpu;
+
+               for_each_possible_cpu(cpu)
+                       per_cpu(vector_irq, cpu)[i] = i;
+       }
+#endif /* CONFIG_X86_64 */
+
+       xen_init_IRQ();
+}
+
 static const struct pv_irq_ops xen_irq_ops __initdata = {
-       .init_IRQ = xen_init_IRQ,
+       .init_IRQ = __xen_init_IRQ,
        .save_fl = xen_save_fl,
        .restore_fl = xen_restore_fl,
        .irq_disable = xen_irq_disable,