diff options
Diffstat (limited to 'arch/x86/xen/enlighten.c')
| -rw-r--r-- | arch/x86/xen/enlighten.c | 21 |
1 files changed, 21 insertions, 0 deletions
diff --git a/arch/x86/xen/enlighten.c b/arch/x86/xen/enlighten.c index 65d8d79b46a..1ea06f842a9 100644 --- a/arch/x86/xen/enlighten.c +++ b/arch/x86/xen/enlighten.c @@ -335,6 +335,24 @@ static void xen_set_ldt(const void *addr, unsigned entries) xen_mc_issue(PARAVIRT_LAZY_CPU); } +#ifdef CONFIG_X86_32 +static void xen_load_user_cs_desc(int cpu, struct mm_struct *mm) +{ + void *gdt; + xmaddr_t mgdt; + u64 descriptor; + struct desc_struct user_cs; + + gdt = &get_cpu_gdt_table(cpu)[GDT_ENTRY_DEFAULT_USER_CS]; + mgdt = virt_to_machine(gdt); + + user_cs = mm->context.user_cs; + descriptor = (u64) user_cs.a | ((u64) user_cs.b) << 32; + + HYPERVISOR_update_descriptor(mgdt.maddr, descriptor); +} +#endif /*CONFIG_X86_32*/ + static void xen_load_gdt(const struct desc_ptr *dtr) { unsigned long va = dtr->address; @@ -961,6 +979,9 @@ static const struct pv_cpu_ops xen_cpu_ops __initdata = { .load_tr_desc = paravirt_nop, .set_ldt = xen_set_ldt, +#ifdef CONFIG_X86_32 + .load_user_cs_desc = xen_load_user_cs_desc, +#endif /*CONFIG_X86_32*/ .load_gdt = xen_load_gdt, .load_idt = xen_load_idt, .load_tls = xen_load_tls, |