[Xen-devel] [PATCH v1 5/8]: PVH smp changes

[Mukesh Rathor <mukesh.rathor@xxxxxxxxxx>]

---
 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


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