xen/arch/x86/domain.c


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/******************************************************************************
 * arch/x86/domain.c
 *
 * x86-specific domain handling (e.g., register setup and context switching).
 */

/*
 *  Copyright (C) 1995  Linus Torvalds
 *
 *  Pentium III FXSR, SSE support
 *  Gareth Hughes <gareth@valinux.com>, May 2000
 */

#include <xen/config.h>
#include <xen/init.h>
#include <xen/lib.h>
#include <xen/errno.h>
#include <xen/sched.h>
#include <xen/smp.h>
#include <xen/delay.h>
#include <xen/softirq.h>
#include <xen/grant_table.h>
#include <xen/iocap.h>
#include <asm/regs.h>
#include <asm/mc146818rtc.h>
#include <asm/system.h>
#include <asm/io.h>
#include <asm/processor.h>
#include <asm/desc.h>
#include <asm/i387.h>
#include <asm/mpspec.h>
#include <asm/ldt.h>
#include <xen/irq.h>
#include <xen/event.h>
#include <asm/shadow.h>
#include <xen/console.h>
#include <xen/elf.h>
#include <asm/vmx.h>
#include <asm/msr.h>
#include <xen/kernel.h>
#include <xen/multicall.h>

/* opt_noreboot: If true, machine will need manual reset on error. */
static int opt_noreboot = 0;
boolean_param("noreboot", opt_noreboot);

struct percpu_ctxt {
    struct vcpu *curr_vcpu;
    unsigned int dirty_segment_mask;
} __cacheline_aligned;
static struct percpu_ctxt percpu_ctxt[NR_CPUS];

static void continue_idle_domain(struct vcpu *v)
{
    reset_stack_and_jump(idle_loop);
}

static void continue_nonidle_domain(struct vcpu *v)
{
    reset_stack_and_jump(ret_from_intr);
}

static void default_idle(void)
{
    local_irq_disable();
    if ( !softirq_pending(smp_processor_id()) )
        safe_halt();
    else
        local_irq_enable();
}

void idle_loop(void)
{
    int cpu = smp_processor_id();

    for ( ; ; )
    {
        irq_stat[cpu].idle_timestamp = jiffies;

        while ( !softirq_pending(cpu) )
        {
            page_scrub_schedule_work();
            default_idle();
        }

        do_softirq();
    }
}

void startup_cpu_idle_loop(void)
{
    struct vcpu *v = current;

    ASSERT(is_idle_vcpu(v));
    cpu_set(smp_processor_id(), v->domain->domain_dirty_cpumask);
    cpu_set(smp_processor_id(), v->vcpu_dirty_cpumask);

    reset_stack_and_jump(idle_loop);
}

static long no_idt[2];
static int reboot_mode;

static inline void kb_wait(void)
{
    int i;

    for ( i = 0; i < 0x10000; i++ )
        if ( (inb_p(0x64) & 0x02) == 0 )
            break;
}

void machine_restart(char * __unused)
{
    int i;

    if ( opt_noreboot )
    {
        printk("Reboot disabled on cmdline: require manual reset\n");
        for ( ; ; )
            safe_halt();
    }

    watchdog_disable();
    console_start_sync();

    local_irq_enable();

    /* Ensure we are the boot CPU. */
    if ( GET_APIC_ID(apic_read(APIC_ID)) != boot_cpu_physical_apicid )
    {
        smp_call_function((void *)machine_restart, NULL, 1, 0);
        for ( ; ; )
            safe_halt();
    }

    /*
     * Stop all CPUs and turn off local APICs and the IO-APIC, so
     * other OSs see a clean IRQ state.
     */
    smp_send_stop();
    disable_IO_APIC();

    stop_vmx();

    /* Rebooting needs to touch the page at absolute address 0. */
    *((unsigned short *)__va(0x472)) = reboot_mode;

    for ( ; ; )
    {
        /* Pulse the keyboard reset line. */
        for ( i = 0; i < 100; i++ )
        {
            kb_wait();
            udelay(50);
            outb(0xfe,0x64); /* pulse reset low */
            udelay(50);
        }

        /* That didn't work - force a triple fault.. */
        __asm__ __volatile__("lidt %0": "=m" (no_idt));
        __asm__ __volatile__("int3");
    }
}


void __attribute__((noreturn)) __machine_halt(void *unused)
{
    for ( ; ; )
        safe_halt();
}

void machine_halt(void)
{
    watchdog_disable();
    console_start_sync();
    smp_call_function(__machine_halt, NULL, 1, 0);
    __machine_halt(NULL);
}

void dump_pageframe_info(struct domain *d)
{
    struct pfn_info *page;

    printk("Memory pages belonging to domain %u:\n", d->domain_id);

    if ( d->tot_pages >= 10 )
    {
        printk("    DomPage list too long to display\n");
    }
    else
    {
        list_for_each_entry ( page, &d->page_list, list )
        {
            printk("    DomPage %p: mfn=%p, caf=%08x, taf=%" PRtype_info "\n",
                   _p(page_to_phys(page)), _p(page_to_pfn(page)),
                   page->count_info, page->u.inuse.type_info);
        }
    }

    list_for_each_entry ( page, &d->xenpage_list, list )
    {
        printk("    XenPage %p: mfn=%p, caf=%08x, taf=%" PRtype_info "\n",