---
arch/x86/xen/smp.c | 75 ++++++++++++++++++++++++++++++++++------------------
1 files changed, 49 insertions(+), 26 deletions(-)
diff --git a/arch/x86/xen/smp.c b/arch/x86/xen/smp.c
index f58dca7..e1e8582 100644
--- a/arch/x86/xen/smp.c
+++ b/arch/x86/xen/smp.c
@@ -68,9 +68,11 @@ static void __cpuinit cpu_bringup(void)
touch_softlockup_watchdog();
preempt_disable();
- xen_enable_sysenter();
- xen_enable_syscall();
-
+ /* PVH runs in ring 0 and allows us to do native syscalls. Yay! */
+ if (!xen_feature(XENFEAT_supervisor_mode_kernel)) {
+ xen_enable_sysenter();
+ xen_enable_syscall();
+ }
cpu = smp_processor_id();
smp_store_cpu_info(cpu);
cpu_data(cpu).x86_max_cores = 1;
@@ -230,10 +232,11 @@ static void __init xen_smp_prepare_boot_cpu(void)
BUG_ON(smp_processor_id() != 0);
native_smp_prepare_boot_cpu();
- /* We''ve switched to the "real" per-cpu gdt, so make sure
the
- old memory can be recycled */
- make_lowmem_page_readwrite(xen_initial_gdt);
-
+ if (!xen_feature(XENFEAT_writable_page_tables)) {
+ /* We''ve switched to the "real" per-cpu gdt, so make sure
the
+ * old memory can be recycled */
+ make_lowmem_page_readwrite(xen_initial_gdt);
+ }
xen_filter_cpu_maps();
xen_setup_vcpu_info_placement();
}
@@ -300,8 +303,6 @@ cpu_initialize_context(unsigned int cpu, struct task_struct
*idle)
gdt = get_cpu_gdt_table(cpu);
ctxt->flags = VGCF_IN_KERNEL;
- ctxt->user_regs.ds = __USER_DS;
- ctxt->user_regs.es = __USER_DS;
ctxt->user_regs.ss = __KERNEL_DS;
#ifdef CONFIG_X86_32
ctxt->user_regs.fs = __KERNEL_PERCPU;
@@ -310,35 +311,57 @@ cpu_initialize_context(unsigned int cpu, struct
task_struct *idle)
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 */
memset(&ctxt->fpu_ctxt, 0, sizeof(ctxt->fpu_ctxt));
- xen_copy_trap_info(ctxt->trap_ctxt);
+ /* check for autoxlated to get it right for 32bit kernel */
+ if (xen_feature(XENFEAT_auto_translated_physmap) &&
+ xen_feature(XENFEAT_supervisor_mode_kernel)) {
- ctxt->ldt_ents = 0;
+ ctxt->user_regs.ds = __KERNEL_DS;
+ ctxt->user_regs.es = 0;
+ ctxt->user_regs.gs = 0;
- BUG_ON((unsigned long)gdt & ~PAGE_MASK);
+ ctxt->gdt_frames[0] = (unsigned long)gdt;
+ ctxt->gdt_ents = (unsigned long)(GDT_SIZE - 1);
- gdt_mfn = arbitrary_virt_to_mfn(gdt);
- make_lowmem_page_readonly(gdt);
- make_lowmem_page_readonly(mfn_to_virt(gdt_mfn));
+#ifdef CONFIG_X86_64
+ /* Note: PVH is not supported on x86_32. */
+ ctxt->gs_base_user = (unsigned long)
+ per_cpu(irq_stack_union.gs_base, cpu);
+#endif
+ } else {
+ ctxt->user_regs.eflags = 0x1000; /* IOPL_RING1 */
+ ctxt->user_regs.ds = __USER_DS;
+ ctxt->user_regs.es = __USER_DS;
- ctxt->gdt_frames[0] = gdt_mfn;
- ctxt->gdt_ents = GDT_ENTRIES;
+ xen_copy_trap_info(ctxt->trap_ctxt);
- ctxt->user_regs.cs = __KERNEL_CS;
- ctxt->user_regs.esp = idle->thread.sp0 - sizeof(struct pt_regs);
+ ctxt->ldt_ents = 0;
- ctxt->kernel_ss = __KERNEL_DS;
- ctxt->kernel_sp = idle->thread.sp0;
+ BUG_ON((unsigned long)gdt & ~PAGE_MASK);
+
+ gdt_mfn = arbitrary_virt_to_mfn(gdt);
+ make_lowmem_page_readonly(gdt);
+ make_lowmem_page_readonly(mfn_to_virt(gdt_mfn));
+
+ ctxt->gdt_frames[0] = gdt_mfn;
+ ctxt->gdt_ents = GDT_ENTRIES;
+
+ ctxt->kernel_ss = __KERNEL_DS;
+ ctxt->kernel_sp = idle->thread.sp0;
#ifdef CONFIG_X86_32
- ctxt->event_callback_cs = __KERNEL_CS;
- ctxt->failsafe_callback_cs = __KERNEL_CS;
+ ctxt->event_callback_cs = __KERNEL_CS;
+ ctxt->failsafe_callback_cs = __KERNEL_CS;
#endif
- ctxt->event_callback_eip = (unsigned long)xen_hypervisor_callback;
- ctxt->failsafe_callback_eip = (unsigned long)xen_failsafe_callback;
+ ctxt->event_callback_eip =
+ (unsigned long)xen_hypervisor_callback;
+ ctxt->failsafe_callback_eip =
+ (unsigned long)xen_failsafe_callback;
+ }
+ ctxt->user_regs.cs = __KERNEL_CS;
+ ctxt->user_regs.esp = idle->thread.sp0 - sizeof(struct pt_regs);
per_cpu(xen_cr3, cpu) = __pa(swapper_pg_dir);
ctxt->ctrlreg[3] = xen_pfn_to_cr3(virt_to_mfn(swapper_pg_dir));
--
1.7.2.3