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xen-devel

Re: [Xen-devel] RE: x86_64 SMP support (status update)

To: "Li, Xin B" <xin.b.li@xxxxxxxxx>
Subject: Re: [Xen-devel] RE: x86_64 SMP support (status update)
From: Chris Wright <chrisw@xxxxxxxx>
Date: Wed, 29 Jun 2005 18:05:47 -0700
Cc: Chris Wright <chrisw@xxxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxx, "Nakajima, Jun" <jun.nakajima@xxxxxxxxx>
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* Li, Xin B (xin.b.li@xxxxxxxxx) wrote:
> Chris, I'm here working on x86_64 SMP support too, can you send me your
> patch?
> I'm using your previous patch, and get some page faults while boot the
> secondary CPU.

Yes, here it is, there's only one line change (sorry, I thought this
change was in the last one).  This should get you to faulting on the
first CPU (which is actually progress ;-).  I think the second CPU is
happliy idling in cpu_idle, and the first one is back to finishing up
booting when it dies.

thanks,
-chris

===== linux-2.6.11-xen-sparse/arch/xen/x86_64/kernel/Makefile 1.5 vs edited 
=====
Index: xen-unstable/linux-2.6.11-xen-sparse/arch/xen/x86_64/kernel/Makefile
===================================================================
--- xen-unstable.orig/linux-2.6.11-xen-sparse/arch/xen/x86_64/kernel/Makefile
+++ xen-unstable/linux-2.6.11-xen-sparse/arch/xen/x86_64/kernel/Makefile
@@ -25,7 +25,7 @@ obj-$(CONFIG_ACPI_BOOT)               += acpi/
 obj-$(CONFIG_X86_MSR)          += msr.o
 obj-$(CONFIG_MICROCODE)                += microcode.o
 obj-$(CONFIG_X86_CPUID)                += cpuid.o
-#obj-$(CONFIG_SMP)             += smp.o smpboot.o trampoline.o
+obj-$(CONFIG_SMP)              += smp.o smpboot.o trampoline.o
 obj-$(CONFIG_X86_LOCAL_APIC)   += apic.o
 c-obj-$(CONFIG_X86_LOCAL_APIC) += nmi.o
 obj-$(CONFIG_X86_IO_APIC)      += io_apic.o mpparse.o
@@ -53,7 +53,7 @@ intel_cacheinfo-y             += ../../../i386/kern
 quirks-y                       += ../../../i386/kernel/quirks.o
 
 c-link := init_task.o
-s-link := vsyscall.o 
+s-link := vsyscall.o trampoline.o
 
 $(patsubst %.o,$(obj)/%.c,$(c-obj-y) $(c-link)) $(patsubst 
%.o,$(obj)/%.S,$(s-obj-y) $(s-link)):
        ln -fsn $(srctree)/arch/x86_64/kernel/$(notdir $@) $@
Index: xen-unstable/linux-2.6.11-xen-sparse/arch/xen/x86_64/kernel/smp.c
===================================================================
--- xen-unstable.orig/linux-2.6.11-xen-sparse/arch/xen/x86_64/kernel/smp.c
+++ xen-unstable/linux-2.6.11-xen-sparse/arch/xen/x86_64/kernel/smp.c
@@ -24,8 +24,13 @@
 #include <asm/mtrr.h>
 #include <asm/pgalloc.h>
 #include <asm/tlbflush.h>
+#if 1 /* Xen */
 #include <asm/mach_apic.h>
+#endif
 #include <asm/proto.h>
+#include <asm-xen/evtchn.h>
+
+#define xxprint(msg) HYPERVISOR_console_io(CONSOLEIO_write, strlen(msg), msg)
 
 /*
  *     Smarter SMP flushing macros. 
@@ -101,6 +106,7 @@ static inline void leave_mm (unsigned lo
  * 2) Leave the mm if we are in the lazy tlb mode.
  */
 
+#if 0 /* Xen */
 asmlinkage void smp_invalidate_interrupt (void)
 {
        unsigned long cpu;
@@ -249,6 +255,20 @@ void flush_tlb_all(void)
        on_each_cpu(do_flush_tlb_all, NULL, 1, 1);
 }
 
+#else
+asmlinkage void smp_invalidate_interrupt (void)
+{ return; }
+void flush_tlb_current_task(void)
+{ xen_tlb_flush_mask(&current->mm->cpu_vm_mask); }
+void flush_tlb_mm (struct mm_struct * mm)
+{ xen_tlb_flush_mask(&mm->cpu_vm_mask); }
+void flush_tlb_page(struct vm_area_struct * vma, unsigned long va)
+{ xen_invlpg_mask(&vma->vm_mm->cpu_vm_mask, va); }
+void flush_tlb_all(void)
+{ xen_tlb_flush_all(); }
+#endif /* Xen */
+
+
 void smp_kdb_stop(void)
 {
        send_IPI_allbutself(KDB_VECTOR);
@@ -308,13 +328,13 @@ static void __smp_call_function (void (*
 
        /* Wait for response */
        while (atomic_read(&data.started) != cpus)
-               cpu_relax();
+               barrier();
 
        if (!wait)
                return;
 
        while (atomic_read(&data.finished) != cpus)
-               cpu_relax();
+               barrier();
 }
 
 /*
@@ -348,7 +368,11 @@ void smp_stop_cpu(void)
         */
        cpu_clear(smp_processor_id(), cpu_online_map);
        local_irq_disable();
+#if 1
+       xxprint("stop_this_cpu disable_local_APIC\n");
+#else
        disable_local_APIC();
+#endif
        local_irq_enable(); 
 }
 
@@ -362,8 +386,10 @@ static void smp_really_stop_cpu(void *du
 void smp_send_stop(void)
 {
        int nolock = 0;
+#if 0
        if (reboot_force)
                return;
+#endif
        /* Don't deadlock on the call lock in panic */
        if (!spin_trylock(&call_lock)) {
                /* ignore locking because we have paniced anyways */
@@ -380,18 +406,17 @@ void smp_send_stop(void)
  * all the work is done automatically when
  * we return from the interrupt.
  */
-asmlinkage void smp_reschedule_interrupt(void)
+asmlinkage irqreturn_t smp_reschedule_interrupt(void)
 {
-       ack_APIC_irq();
+       return IRQ_HANDLED;
 }
 
-asmlinkage void smp_call_function_interrupt(void)
+asmlinkage irqreturn_t smp_call_function_interrupt(void)
 {
        void (*func) (void *info) = call_data->func;
        void *info = call_data->info;
        int wait = call_data->wait;
 
-       ack_APIC_irq();
        /*
         * Notify initiating CPU that I've grabbed the data and am
         * about to execute the function
@@ -408,4 +433,6 @@ asmlinkage void smp_call_function_interr
                mb();
                atomic_inc(&call_data->finished);
        }
+       
+       return IRQ_HANDLED;
 }
Index: xen-unstable/linux-2.6.11-xen-sparse/arch/xen/x86_64/kernel/smpboot.c
===================================================================
--- xen-unstable.orig/linux-2.6.11-xen-sparse/arch/xen/x86_64/kernel/smpboot.c
+++ xen-unstable/linux-2.6.11-xen-sparse/arch/xen/x86_64/kernel/smpboot.c
@@ -53,6 +53,7 @@
 #include <asm/kdebug.h>
 #include <asm/tlbflush.h>
 #include <asm/proto.h>
+#include <asm/arch_hooks.h>
 
 /* Number of siblings per CPU package */
 int smp_num_siblings = 1;
@@ -75,6 +76,7 @@ int smp_threads_ready;
 
 cpumask_t cpu_sibling_map[NR_CPUS] __cacheline_aligned;
 
+#if 0
 /*
  * Trampoline 80x86 program as an array.
  */
@@ -96,6 +98,7 @@ static unsigned long __init setup_trampo
        memcpy(tramp, trampoline_data, trampoline_end - trampoline_data);
        return virt_to_phys(tramp);
 }
+#endif
 
 /*
  * The bootstrap kernel entry code has set these up. Save them for
@@ -110,6 +113,7 @@ static void __init smp_store_cpu_info(in
        identify_cpu(c);
 }
 
+#if 0
 /*
  * TSC synchronization.
  *
@@ -246,6 +250,7 @@ static void __init synchronize_tsc_ap (v
        }
 }
 #undef NR_LOOPS
+#endif
 
 static atomic_t init_deasserted;
 
@@ -254,6 +259,7 @@ void __init smp_callin(void)
        int cpuid, phys_id;
        unsigned long timeout;
 
+#if 0
        /*
         * If waken up by an INIT in an 82489DX configuration
         * we may get here before an INIT-deassert IPI reaches
@@ -261,11 +267,12 @@ void __init smp_callin(void)
         * lock up on an APIC access.
         */
        while (!atomic_read(&init_deasserted));
+#endif
 
        /*
         * (This works even if the APIC is not enabled.)
         */
-       phys_id = GET_APIC_ID(apic_read(APIC_ID));
+       phys_id = smp_processor_id();
        cpuid = smp_processor_id();
        if (cpu_isset(cpuid, cpu_callin_map)) {
                panic("smp_callin: phys CPU#%d, CPU#%d already present??\n",
@@ -299,6 +306,7 @@ void __init smp_callin(void)
                        cpuid);
        }
 
+#if 0
        /*
         * the boot CPU has finished the init stage and is spinning
         * on callin_map until we finish. We are free to set up this
@@ -308,6 +316,7 @@ void __init smp_callin(void)
 
        Dprintk("CALLIN, before setup_local_APIC().\n");
        setup_local_APIC();
+#endif
 
        local_irq_enable();
 
@@ -317,7 +326,9 @@ void __init smp_callin(void)
        calibrate_delay();
        Dprintk("Stack at about %p\n",&cpuid);
 
+#if 0
        disable_APIC_timer();
+#endif
 
        /*
         * Save our processor parameters
@@ -331,15 +342,39 @@ void __init smp_callin(void)
         */
        cpu_set(cpuid, cpu_callin_map);
 
+#if 0
        /*
         *      Synchronize the TSC with the BP
         */
        if (cpu_has_tsc)
                synchronize_tsc_ap();
+#endif
 }
 
 int cpucount;
 
+#include <linux/interrupt.h>
+static irqreturn_t ldebug_interrupt(
+       int irq, void *dev_id, struct pt_regs *regs)
+{
+       return IRQ_HANDLED;
+}
+
+static DEFINE_PER_CPU(int, ldebug_irq);
+static char ldebug_name[NR_CPUS][15];
+
+void ldebug_setup(void)
+{
+       int cpu = smp_processor_id();
+
+       per_cpu(ldebug_irq, cpu) = bind_virq_to_irq(VIRQ_DEBUG);
+       sprintf(ldebug_name[cpu], "ldebug%d", cpu);
+       BUG_ON(request_irq(per_cpu(ldebug_irq, cpu), ldebug_interrupt,
+                          SA_INTERRUPT, ldebug_name[cpu], NULL));
+}
+
+extern void local_setup_timer(void);
+
 /*
  * Activate a secondary processor.
  */
@@ -360,6 +395,7 @@ void __init start_secondary(void)
        while (!cpu_isset(smp_processor_id(), smp_commenced_mask))
                rep_nop();
 
+#if 0
        Dprintk("cpu %d: setting up apic clock\n", smp_processor_id());         
        setup_secondary_APIC_clock();
 
@@ -373,6 +409,12 @@ void __init start_secondary(void)
 
 
        enable_APIC_timer(); 
+#else
+       local_setup_timer();
+       ldebug_setup();
+       smp_intr_init();
+       local_irq_enable();
+#endif
 
        /*
         * low-memory mappings have been cleared, flush them from
@@ -428,6 +470,7 @@ static inline void inquire_remote_apic(i
 }
 #endif
 
+#if 0
 static int __init wakeup_secondary_via_INIT(int phys_apicid, unsigned int 
start_rip)
 {
        unsigned long send_status = 0, accept_status = 0;
@@ -550,6 +593,7 @@ static int __init wakeup_secondary_via_I
 
        return (send_status | accept_status);
 }
+#endif
 
 static void __init do_boot_cpu (int apicid)
 {
@@ -557,6 +601,14 @@ static void __init do_boot_cpu (int apic
        unsigned long boot_error;
        int timeout, cpu;
        unsigned long start_rip;
+#if 1
+       vcpu_guest_context_t ctxt;
+       extern void startup_64_smp(void);
+       extern void hypervisor_callback(void);
+       extern void failsafe_callback(void);
+       extern void smp_trap_init(trap_info_t *);
+       int i;
+#endif
 
        cpu = ++cpucount;
        /*
@@ -570,7 +622,7 @@ static void __init do_boot_cpu (int apic
 
        cpu_pda[cpu].pcurrent = idle;
 
-       start_rip = setup_trampoline();
+       start_rip = (unsigned long)startup_64_smp;
 
        init_rsp = idle->thread.rsp; 
        per_cpu(init_tss,cpu).rsp0 = init_rsp;
@@ -587,6 +639,94 @@ static void __init do_boot_cpu (int apic
 
        atomic_set(&init_deasserted, 0);
 
+#if 1
+       if (cpu_gdt_descr[0].size > PAGE_SIZE)
+               BUG();
+       cpu_gdt_descr[cpu].size = cpu_gdt_descr[0].size;
+       memcpy((void *)cpu_gdt_descr[cpu].address,
+               (void *)cpu_gdt_descr[0].address, cpu_gdt_descr[0].size);
+
+       memset(&ctxt, 0, sizeof(ctxt));
+
+       ctxt.flags = VGCF_IN_KERNEL;
+       ctxt.user_regs.ds = __USER_DS;
+       ctxt.user_regs.es = __USER_DS;
+       ctxt.user_regs.fs = 0;
+       ctxt.user_regs.gs = 0;
+       ctxt.user_regs.ss = __KERNEL_DS|0x3;
+       ctxt.user_regs.cs = __KERNEL_CS|0x3;
+       ctxt.user_regs.rip = start_rip;
+       ctxt.user_regs.rsp = idle->thread.rsp;
+       ctxt.user_regs.eflags = (1<<9) | (1<<2) | (idle->thread.io_pl<<12);
+
+       /* FPU is set up to default initial state. */
+       memset(&ctxt.fpu_ctxt, 0, sizeof(ctxt.fpu_ctxt));
+
+       /* Virtual IDT is empty at start-of-day. */
+       for ( i = 0; i < 256; i++ )
+       {
+               ctxt.trap_ctxt[i].vector = i;
+               ctxt.trap_ctxt[i].cs     = FLAT_KERNEL_CS;
+       }
+       smp_trap_init(ctxt.trap_ctxt);
+
+       /* No LDT. */
+       ctxt.ldt_ents = 0;
+
+       {
+               unsigned long va;
+               int f;
+
+               for (va = cpu_gdt_descr[cpu].address, f = 0;
+                    va < cpu_gdt_descr[cpu].address + cpu_gdt_descr[cpu].size;
+                    va += PAGE_SIZE, f++) {
+                       ctxt.gdt_frames[f] = virt_to_machine(va) >> PAGE_SHIFT;
+                       make_page_readonly((void *)va);
+               }
+               ctxt.gdt_ents = GDT_ENTRIES;
+       }
+
+       /* Ring 1 stack is the initial stack. */
+       ctxt.kernel_ss = __KERNEL_DS;
+       ctxt.kernel_sp = idle->thread.rsp;
+
+       /* Callback handlers. */
+       ctxt.event_callback_eip    = (unsigned long)hypervisor_callback;
+       ctxt.failsafe_callback_eip = (unsigned long)failsafe_callback;
+
+       ctxt.ctrlreg[3] = (unsigned long)virt_to_machine(init_level4_pgt);
+
+       boot_error = HYPERVISOR_boot_vcpu(cpu, &ctxt);
+
+       if (!boot_error) {
+               /*
+                * allow APs to start initializing.
+                */
+               Dprintk("Before Callout %d.\n", cpu);
+               cpu_set(cpu, cpu_callout_map);
+               Dprintk("After Callout %d.\n", cpu);
+
+               /*
+                * Wait 5s total for a response
+                */
+               for (timeout = 0; timeout < 50000; timeout++) {
+                       if (cpu_isset(cpu, cpu_callin_map))
+                               break;  /* It has booted */
+                       udelay(100);
+               }
+
+               if (cpu_isset(cpu, cpu_callin_map)) {
+                       /* number CPUs logically, starting from 1 (BSP is 0) */
+                       Dprintk("OK.\n");
+                       printk("CPU%d: ", cpu);
+                       print_cpu_info(&cpu_data[cpu]);
+                       Dprintk("CPU has booted.\n");
+               } else {
+                       boot_error= 1;
+               }
+       }
+       x86_cpu_to_apicid[cpu] = apicid;
+#else
        Dprintk("Setting warm reset code and vector.\n");
 
        CMOS_WRITE(0xa, 0xf);
@@ -652,6 +792,7 @@ static void __init do_boot_cpu (int apic
 #endif
                }
        }
+#endif
        if (boot_error) {
                cpu_clear(cpu, cpu_callout_map); /* was set here 
(do_boot_cpu()) */
                clear_bit(cpu, &cpu_initialized); /* was set by cpu_init() */
@@ -709,9 +850,15 @@ static void smp_tune_scheduling (void)
  * Cycle through the processors sending APIC IPIs to boot each.
  */
 
+/* XXX fix me */
+#define time_init_smp()
+
 static void __init smp_boot_cpus(unsigned int max_cpus)
 {
-       unsigned apicid, cpu, bit, kicked;
+       unsigned cpu, kicked;
+#if 0
+       unsigned apicid, bit;
+#endif
 
        nmi_watchdog_default();
 
@@ -725,11 +872,13 @@ static void __init smp_boot_cpus(unsigne
        current_thread_info()->cpu = 0;
        smp_tune_scheduling();
 
+#if 0
        if (!physid_isset(hard_smp_processor_id(), phys_cpu_present_map)) {
                printk("weird, boot CPU (#%d) not listed by the BIOS.\n",
                       hard_smp_processor_id());
                physid_set(hard_smp_processor_id(), phys_cpu_present_map);
        }
+#endif
 
        /*
         * If we couldn't find an SMP configuration at boot time,
@@ -739,13 +888,16 @@ static void __init smp_boot_cpus(unsigne
                printk(KERN_NOTICE "SMP motherboard not detected.\n");
                io_apic_irqs = 0;
                cpu_online_map = cpumask_of_cpu(0);
+#if 0
                phys_cpu_present_map = physid_mask_of_physid(0);
+#endif
                if (APIC_init_uniprocessor())
                        printk(KERN_NOTICE "Local APIC not detected."
                                           " Using dummy APIC emulation.\n");
                goto smp_done;
        }
 
+#if 0
        /*
         * Should not be necessary because the MP table should list the boot
         * CPU too, but we do it for the sake of robustness anyway.
@@ -771,51 +923,50 @@ static void __init smp_boot_cpus(unsigne
        }
 
        verify_local_APIC();
+#endif
 
        /*
         * If SMP should be disabled, then really disable it!
         */
        if (!max_cpus) {
-               smp_found_config = 0;
+               HYPERVISOR_shared_info->n_vcpu = 1;
                printk(KERN_INFO "SMP mode deactivated, forcing use of dummy 
APIC emulation.\n");
                io_apic_irqs = 0;
                cpu_online_map = cpumask_of_cpu(0);
+#if 0
                phys_cpu_present_map = physid_mask_of_physid(0);
+#endif
                disable_apic = 1;
                goto smp_done;
        }
 
+       smp_intr_init();
+
+#if 0
        connect_bsp_APIC();
        setup_local_APIC();
 
        if (GET_APIC_ID(apic_read(APIC_ID)) != boot_cpu_id)
                BUG();
+#endif
 
        x86_cpu_to_apicid[0] = boot_cpu_id;
 
        /*
         * Now scan the CPU present map and fire up the other CPUs.
         */
-       Dprintk("CPU present map: %lx\n", physids_coerce(phys_cpu_present_map));
+       Dprintk("CPU present map: %lx\n", HYPERVISOR_shared_info->n_vcpu)
 
        kicked = 1;
-       for (bit = 0; kicked < NR_CPUS && bit < MAX_APICS; bit++) {
-               apicid = cpu_present_to_apicid(bit);
-               /*
-                * Don't even attempt to start the boot CPU!
-                */
-               if (apicid == boot_cpu_id || (apicid == BAD_APICID))
-                       continue;
-
-               if (!physid_isset(apicid, phys_cpu_present_map))
+       for (cpu = 1; kicked < NR_CPUS &&
+                    cpu < HYPERVISOR_shared_info->n_vcpu; cpu++) {
+               if (max_cpus <= cpucount+1)
                        continue;
-               if ((max_cpus >= 0) && (max_cpus <= cpucount+1))
-                       continue;
-
-               do_boot_cpu(apicid);
+               do_boot_cpu(cpu);
                ++kicked;
        }
 
+#if 0
        /*
         * Cleanup possible dangling ends...
         */
@@ -833,6 +984,7 @@ static void __init smp_boot_cpus(unsigne
 
                *((volatile int *) phys_to_virt(0x467)) = 0;
        }
+#endif
 
        /*
         * Allow the user to impress friends.
@@ -899,6 +1051,7 @@ static void __init smp_boot_cpus(unsigne
        else
                nr_ioapics = 0;
 
+#if 0
        setup_boot_APIC_clock();
 
        /*
@@ -906,6 +1059,7 @@ static void __init smp_boot_cpus(unsigne
         */
        if (cpu_has_tsc && cpucount)
                synchronize_tsc_bp();
+#endif
 
  smp_done:
        time_init_smp();
@@ -950,9 +1104,36 @@ int __devinit __cpu_up(unsigned int cpu)
 
 void __init smp_cpus_done(unsigned int max_cpus)
 {
+#if 0
 #ifdef CONFIG_X86_IO_APIC
        setup_ioapic_dest();
 #endif
        zap_low_mappings();
+#endif
 }
 
+extern irqreturn_t smp_reschedule_interrupt(int, void *, struct pt_regs *);
+extern irqreturn_t smp_call_function_interrupt(int, void *, struct pt_regs *);
+
+static DEFINE_PER_CPU(int, resched_irq);
+static DEFINE_PER_CPU(int, callfunc_irq);
+static char resched_name[NR_CPUS][15];
+static char callfunc_name[NR_CPUS][15];
+
+void __init smp_intr_init(void)
+{
+       int cpu = smp_processor_id();
+
+       per_cpu(resched_irq, cpu) =
+               bind_ipi_on_cpu_to_irq(cpu, RESCHEDULE_VECTOR);
+       sprintf(resched_name[cpu], "resched%d", cpu);
+       BUG_ON(request_irq(per_cpu(resched_irq, cpu), smp_reschedule_interrupt,
+                          SA_INTERRUPT, resched_name[cpu], NULL));
+
+       per_cpu(callfunc_irq, cpu) =
+               bind_ipi_on_cpu_to_irq(cpu, CALL_FUNCTION_VECTOR);
+       sprintf(callfunc_name[cpu], "callfunc%d", cpu);
+       BUG_ON(request_irq(per_cpu(callfunc_irq, cpu),
+                          smp_call_function_interrupt,
+                          SA_INTERRUPT, callfunc_name[cpu], NULL));
+}
Index: xen-unstable/linux-2.6.11-xen-sparse/arch/xen/x86_64/kernel/traps.c
===================================================================
--- xen-unstable.orig/linux-2.6.11-xen-sparse/arch/xen/x86_64/kernel/traps.c
+++ xen-unstable/linux-2.6.11-xen-sparse/arch/xen/x86_64/kernel/traps.c
@@ -957,6 +957,17 @@ void __init trap_init(void)
        cpu_init();
 }
 
+void smp_trap_init(trap_info_t *trap_ctxt)
+{
+       trap_info_t *t = trap_table;
+
+       for (t = trap_table; t->address; t++) {
+               trap_ctxt[t->vector].flags = t->flags;
+               trap_ctxt[t->vector].cs = t->cs;
+               trap_ctxt[t->vector].address = t->address;
+       }
+}
+
 
 /* Actual parsing is done early in setup.c. */
 static int __init oops_dummy(char *s)
Index: xen-unstable/linux-2.6.11-xen-sparse/arch/xen/x86_64/kernel/xen_entry.S
===================================================================
--- xen-unstable.orig/linux-2.6.11-xen-sparse/arch/xen/x86_64/kernel/xen_entry.S
+++ xen-unstable/linux-2.6.11-xen-sparse/arch/xen/x86_64/kernel/xen_entry.S
@@ -8,11 +8,14 @@
 #define sizeof_vcpu_shift              3
 
 #ifdef CONFIG_SMP
-#define preempt_disable(reg)   incl threadinfo_preempt_count(reg)
-#define preempt_enable(reg)    decl threadinfo_preempt_count(reg)
+//#define preempt_disable(reg) incl threadinfo_preempt_count(reg)
+//#define preempt_enable(reg)  decl threadinfo_preempt_count(reg)
+#define preempt_disable(reg)
+#define preempt_enable(reg)
 #define XEN_GET_VCPU_INFO(reg) preempt_disable(%rbp)                   ; \
                                movq %gs:pda_cpunumber,reg              ; \
-                               shl  $sizeof_vcpu_shift,reg             ; \
+                               shl  $32, reg                           ; \
+                               shr  $32-sizeof_vcpu_shift,reg          ; \
                                addq HYPERVISOR_shared_info,reg
 #define XEN_PUT_VCPU_INFO(reg) preempt_enable(%rbp)                    ; \
 #define XEN_PUT_VCPU_INFO_fixup .byte 0xff,0xff,0xff
Index: xen-unstable/linux-2.6.11-xen-sparse/arch/xen/x86_64/kernel/irq.c
===================================================================
--- xen-unstable.orig/linux-2.6.11-xen-sparse/arch/xen/x86_64/kernel/irq.c
+++ xen-unstable/linux-2.6.11-xen-sparse/arch/xen/x86_64/kernel/irq.c
@@ -20,7 +20,11 @@
  */
 
 atomic_t irq_err_count;
-
+#ifdef CONFIG_X86_IO_APIC
+#ifdef APIC_MISMATCH_DEBUG
+atomic_t irq_mis_count;
+#endif
+#endif
 
 /*
  * Generic, controller-independent functions:
Index: xen-unstable/linux-2.6.11-xen-sparse/arch/xen/x86_64/kernel/head.S
===================================================================
--- xen-unstable.orig/linux-2.6.11-xen-sparse/arch/xen/x86_64/kernel/head.S
+++ xen-unstable/linux-2.6.11-xen-sparse/arch/xen/x86_64/kernel/head.S
@@ -41,7 +41,6 @@
        .code64
 ENTRY(_start)
         cld                
-       movq init_rsp(%rip),%rsp
        /* Copy the necessary stuff from xen_start_info structure. */
        movq  $xen_start_info_union,%rdi
        movq  $64,%rcx          /* sizeof (union xen_start_info_union) / sizeof 
(long) */
@@ -52,6 +51,7 @@ ENTRY(_start)
        cld
 #endif /* CONFIG_SMP */
 
+       movq init_rsp(%rip),%rsp
        /* zero EFLAGS after setting rsp */
        pushq $0
        popfq
Index: xen-unstable/linux-2.6.11-xen-sparse/arch/xen/x86_64/kernel/setup.c
===================================================================
--- xen-unstable.orig/linux-2.6.11-xen-sparse/arch/xen/x86_64/kernel/setup.c
+++ xen-unstable/linux-2.6.11-xen-sparse/arch/xen/x86_64/kernel/setup.c
@@ -601,6 +601,17 @@ static void __init print_memory_map(char
         }
 }
 
+void __init smp_alloc_memory(void)
+{
+       int cpu;
+
+       for (cpu = 1; cpu < NR_CPUS; cpu++) {
+               cpu_gdt_descr[cpu].address = (unsigned long)
+                       alloc_bootmem_low_pages(PAGE_SIZE);
+               /* XXX free unused pages later */
+       }
+}
+
 void __init setup_arch(char **cmdline_p)
 {
        unsigned long low_mem_size;
@@ -742,6 +753,9 @@ void __init setup_arch(char **cmdline_p)
                }
        }
 #endif
+#ifdef CONFIG_SMP
+       smp_alloc_memory();
+#endif
        paging_init();
 #ifdef CONFIG_X86_LOCAL_APIC
        /*
Index: xen-unstable/linux-2.6.11-xen-sparse/arch/xen/x86_64/kernel/setup64.c
===================================================================
--- xen-unstable.orig/linux-2.6.11-xen-sparse/arch/xen/x86_64/kernel/setup64.c
+++ xen-unstable/linux-2.6.11-xen-sparse/arch/xen/x86_64/kernel/setup64.c
@@ -264,13 +264,13 @@ void __init cpu_init (void)
         * Initialize the per-CPU GDT with the boot GDT,
         * and set up the GDT descriptor:
         */
+#if 0
        if (cpu) {
                memcpy(cpu_gdt_table[cpu], cpu_gdt_table[0], GDT_SIZE);
        }       
 
        cpu_gdt_descr[cpu].size = GDT_SIZE;
        cpu_gdt_descr[cpu].address = (unsigned long)cpu_gdt_table[cpu];
-#if 0
        asm volatile("lgdt %0" :: "m" (cpu_gdt_descr[cpu]));
        asm volatile("lidt %0" :: "m" (idt_descr));
 #endif

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