connectbot-yubikey/open-keychain - open-keychain with patches to support ssh authentication

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/******************************************************************************
 * dom0_ops.c
 * 
 * Process command requests from domain-0 guest OS.
 * 
 * Copyright (c) 2002, K A Fraser
 */

#include <xen/config.h>
#include <xen/types.h>
#include <xen/lib.h>
#include <xen/mm.h>
#include <public/dom0_ops.h>
#include <xen/sched.h>
#include <xen/event.h>
#include <asm/domain_page.h>
#include <xen/trace.h>
#include <xen/console.h>
#include <xen/physdev.h>
#include <asm/shadow.h>
#include <public/sched_ctl.h>

#define TRC_DOM0OP_ENTER_BASE  0x00020000
#define TRC_DOM0OP_LEAVE_BASE  0x00030000

extern unsigned int alloc_new_dom_mem(struct domain *, unsigned int);
extern long arch_do_dom0_op(dom0_op_t *op, dom0_op_t *u_dom0_op);
extern void arch_getdomaininfo_ctxt(
    struct exec_domain *, full_execution_context_t *);

static inline int is_free_domid(domid_t dom)
{
    struct domain *d;

    if ( dom >= DOMID_FIRST_RESERVED )
        return 0;

    if ( (d = find_domain_by_id(dom)) == NULL )
        return 1;

    put_domain(d);
    return 0;
}

/*
 * Allocate a free domain id. We try to reuse domain ids in a fairly low range,
 * only expanding the range when there are no free domain ids. This is to keep 
 * domain ids in a range depending on the number that exist simultaneously,
 * rather than incrementing domain ids in the full 32-bit range.
 */
static int allocate_domid(domid_t *pdom)
{
    static spinlock_t domid_lock = SPIN_LOCK_UNLOCKED;
    static domid_t curdom = 0;
    static domid_t topdom = 101;
    int err = 0;
    domid_t dom;

    spin_lock(&domid_lock);

    /* Try to use a domain id in the range 0..topdom, starting at curdom. */
    for ( dom = curdom + 1; dom != curdom; dom++ )
    {
        if ( dom == topdom )
            dom = 1;
        if ( is_free_domid(dom) )
            goto exit;
    }

    /* Couldn't find a free domain id in 0..topdom, try higher. */
    for ( dom = topdom; dom < DOMID_FIRST_RESERVED; dom++ )
    {
        if ( is_free_domid(dom) )
        {
            topdom = dom + 1;
            goto exit;
        }
    }

    /* No free domain ids. */
    err = -ENOMEM;

  exit:
    if ( err == 0 )
    {
        curdom = dom;
        *pdom = dom;
    }

    spin_unlock(&domid_lock);
    return err;
}

long do_dom0_op(dom0_op_t *u_dom0_op)
{
    long ret = 0;
    dom0_op_t curop, *op = &curop;

    if ( !IS_PRIV(current->domain) )
        return -EPERM;

    if ( copy_from_user(op, u_dom0_op, sizeof(*op)) )
        return -EFAULT;

    if ( op->interface_version != DOM0_INTERFACE_VERSION )
        return -EACCES;

    TRACE_5D(TRC_DOM0OP_ENTER_BASE + op->cmd, 
             0, op->u.dummy[0], op->u.dummy[1], 
             op->u.dummy[2], op->u.dummy[3] );

    switch ( op->cmd )
    {

    case DOM0_SETDOMAININFO:
    {
        struct domain *d = find_domain_by_id(op->u.setdomaininfo.domain);
        ret = -ESRCH;
        if ( d != NULL )
        {
            ret = set_info_guest(d, &op->u.setdomaininfo);
            put_domain(d);
        }
    }
    break;

    case DOM0_PAUSEDOMAIN:
    {
        struct domain *d = find_domain_by_id(op->u.pausedomain.domain);
        ret = -ESRCH;
        if ( d != NULL )
        {
            ret = -EINVAL;
            if ( d != current->domain )
            {
                domain_pause_by_systemcontroller(d);
                ret = 0;
            }
            put_domain(d);
        }
    }
    break;

    case DOM0_UNPAUSEDOMAIN:
    {
        struct domain *d = find_domain_by_id(op->u.unpausedomain.domain);
        ret = -ESRCH;
        if ( d != NULL )
        {
            ret = -EINVAL;
            if ( (d != current->domain) && 
                 test_bit(DF_CONSTRUCTED, &d->d_flags) )
            {
                domain_unpause_by_systemcontroller(d);
                ret = 0;
            }
            put_domain(d);
        }
    }
    break;

    case DOM0_CREATEDOMAIN:
    {
        struct domain *d;
        unsigned int   pro;
        domid_t        dom;

        dom = op->u.createdomain.domain;
        if ( (dom > 0) && (dom < DOMID_FIRST_RESERVED) )
        {
            ret = -EINVAL;
            if ( !is_free_domid(dom) )
                break;
        }
        else if ( (ret = allocate_domid(&dom)) != 0 )
            break;

        if ( op->u.createdomain.cpu == -1 )
        {
            /* Do an initial placement. Pick the least-populated CPU. */
            struct domain *d;
            struct exec_domain *ed;
            unsigned int i, ht, cnt[NR_CPUS] = { 0 };

            read_lock(&domlist_lock);
            for_each_domain ( d ) {
                for_each_exec_domain ( d, ed )
                    cnt[ed->processor]++;
            }
            read_unlock(&domlist_lock);

            /* If we're on a HT system, we only use the first HT for dom0,
               other domains will all share the second HT of each CPU.
	       Since dom0 is on CPU 0, we favour high numbered CPUs in
	       the event of a tie */
            ht = opt_noht ? 1 : ht_per_core;
            pro = ht-1;
            for ( i = pro; i < smp_num_cpus; i += ht )
		if ( cnt[i] <= cnt[pro] )
		    pro = i;
        }
        else
            pro = op->u.createdomain.cpu % smp_num_cpus;

        ret = -ENOMEM;
        if ( (d = do_createdomain(dom, pro)) == NULL )
            break;

        ret = alloc_new_dom_mem(d, op->u.createdomain.memory_kb);
        if ( ret != 0 ) 
        {
            domain_kill(d);
            break;
        }

        ret = 0;
        
        op->u.createdomain.domain = d->id;
        copy_to_user(u_dom0_op, op, sizeof(*op));
    }
    break;

    case DOM0_DESTROYDOMAIN:
    {
        struct domain *d = find_domain_by_id(op->u.destroydomain.domain);
        ret = -ESRCH;
        if ( d != NULL )
        {
            ret = -EINVAL;
            if ( d != current->domain )
            {
                domain_kill(d);
                ret = 0;
            }
            put_domain(d);
        }
    }
    break;

    case DOM0_PINCPUDOMAIN:
    {
        domid_t dom = op->u.pincpudomain.domain;
        struct domain *d = find_domain_by_id(dom);
        struct exec_domain *ed;
        int cpu = op->u.pincpudomain.cpu;

        if ( d == NULL )
        {
            ret = -ESRCH;            
            break;
        }
        
        ed = d->exec_domain[op->u.pincpudomain.exec_domain];
        if ( ed == NULL )
        {
            ret = -ESRCH;
            put_domain(d);
            break;
        }

        if ( ed == current )
        {
            ret = -EINVAL;
            put_domain(d);
            break;
        }

        if ( cpu == -1 )
        {
            clear_bit(EDF_CPUPINNED, &ed->ed_flags);
        }
        else
        {
            exec_domain_pause(ed);
            if ( ed->processor != (cpu % smp_num_cpus) )
                set_bit(EDF_MIGRATED, &ed->ed_flags);
            set_bit(EDF_CPUPINNED, &ed->ed_flags);
            ed->processor = cpu % smp_num_cpus;
            exec_domain_unpause(ed);
        }

        put_domain(d);
    }
    break;

    case DOM0_SCHEDCTL:
    {
        ret = sched_ctl(&op->u.schedctl);
        copy_to_user(u_dom0_op, op, sizeof(*op));
    }
    break;

    case DOM0_ADJUSTDOM:
    {
        ret = sched_adjdom(&op->u.adjustdom);
        copy_to_user(u_dom0_op, op, sizeof(*op));
    }
    break;

    case DOM0_GETDOMAININFO:
    { 
        full_execution_context_t *c;
        struct domain            *d;
        struct exec_domain       *ed;

        read_lock(&domlist_lock);

        for_each_domain ( d )
        {
            if ( d->id >= op->u.getdomaininfo.domain )
                break;
        }

        if ( (d == NULL) || !get_domain(d) )
        {
            read_unlock(&domlist_lock);
            ret = -ESRCH;
            break;
        }

        read_unlock(&domlist_lock);

        op->u.getdomaininfo.domain = d->id;

        if ( (op->u.getdomaininfo.exec_domain >= MAX_VIRT_CPUS) ||
             !d->exec_domain[op->u.getdomaininfo.exec_domain] )
        {
            ret = -EINVAL;
            break;
        }
        
        ed = d->exec_domain[op->u.getdomaininfo.exec_domain];

        op->u.getdomaininfo.flags =
            (test_bit( DF_DYING,      &d->d_flags)  ? DOMFLAGS_DYING    : 0) |
            (test_bit( DF_CRASHED,    &d->d_flags)  ? DOMFLAGS_CRASHED  : 0) |
            (test_bit( DF_SHUTDOWN,   &d->d_flags)  ? DOMFLAGS_SHUTDOWN : 0) |
            (test_bit(EDF_CTRLPAUSE, &ed->ed_flags) ? DOMFLAGS_PAUSED   : 0) |
            (test_bit(EDF_BLOCKED,   &ed->ed_flags) ? DOMFLAGS_BLOCKED  : 0) |
            (test_bit(EDF_RUNNING,   &ed->ed_flags) ? DOMFLAGS_RUNNING  : 0);

        op->u.getdomaininfo.flags |= ed->processor << DOMFLAGS_CPUSHIFT;
        op->u.getdomaininfo.flags |= 
            d->shutdown_code << DOMFLAGS_SHUTDOWNSHIFT;

        op->u.getdomaininfo.tot_pages   = d->tot_pages;
        op->u.getdomaininfo.max_pages   = d->max_pages;
        op->u.getdomaininfo.cpu_time    = ed->cpu_time;
        op->u.getdomaininfo.shared_info_frame = 
            __pa(d->shared_info) >> PAGE_SHIFT;

        if ( op->u.getdomaininfo.ctxt != NULL )
        {
            if ( (c = xmalloc(full_execution_context_t)) == NULL )
            {
                ret = -ENOMEM;
                put_domain(d);
                break;
            }

            if ( ed != current )
                exec_domain_pause(ed);

            arch_getdomaininfo_ctxt(ed,c);

            if ( ed != current )
                exec_domain_unpause(ed);

            if ( copy_to_user(op->u.getdomaininfo.ctxt, c, sizeof(*c)) )
                ret = -EINVAL;

            if ( c != NULL )
                xfree(c);
        }

        if ( copy_to_user(u_dom0_op, op, sizeof(*op)) )     
            ret = -EINVAL;

        put_domain(d);
    }
    break;

    case DOM0_SETTIME:
    {
        do_settime(op->u.settime.secs, 
                   op->u.settime.usecs, 
                   op->u.settime.system_time);
        ret = 0;
    }
    break;

#ifdef TRACE_BUFFER
    case DOM0_GETTBUFS:
    {
        ret = get_tb_info(&op->u.gettbufs);
        copy_to_user(u_dom0_op, op, sizeof(*op));
    }
    break;
#endif
    
    case DOM0_READCONSOLE:
    {
        ret = read_console_ring(op->u.readconsole.str, 
                                op->u.readconsole.count,
                                op->u.readconsole.cmd); 
    }
    break;

    case DOM0_PCIDEV_ACCESS:
    {
        ret = physdev_pci_access_modify(op->u.pcidev_access.domain, 
                                        op->u.pcidev_access.bus,
                                        op->u.pcidev_access.dev,
                                        op->u.pcidev_access.func,
                                        op->u.pcidev_access.enable);
    }
    break;

    case DOM0_SCHED_ID:
    {
        op->u.sched_id.sched_id = sched_id();
        copy_to_user(u_dom0_op, op, sizeof(*op));
        ret = 0;        
    }
    break;

    case DOM0_SETDOMAININITIALMEM:
    {
        struct domain *d; 
        ret = -ESRCH;
        d = find_domain_by_id(op->u.setdomaininitialmem.domain);
        if ( d != NULL )
        { 
            /* should only be used *before* domain is built. */
            if ( !test_bit(DF_CONSTRUCTED, &d->d_flags) )
                ret = alloc_new_dom_mem( 
                    d, op->u.setdomaininitialmem.initial_memkb );
            else
                ret = -EINVAL;
            put_domain(d);
        }
    }
    break;

    case DOM0_SETDOMAINMAXMEM:
    {
        struct domain *d; 
        ret = -ESRCH;
        d = find_domain_by_id( op->u.setdomainmaxmem.domain );
        if ( d != NULL )
        {
            d->max_pages = 
                (op->u.setdomainmaxmem.max_memkb+PAGE_SIZE-1)>> PAGE_SHIFT;
            put_domain(d);
            ret = 0;
        }
    }
    break;

#ifdef PERF_COUNTERS
    case DOM0_PERFCCONTROL:
    {
        extern int perfc_control(dom0_perfccontrol_t *);
        ret = perfc_control(&op->u.perfccontrol);
        copy_to_user(u_dom0_op, op, sizeof(*op));
    }
    break;
#endif

    default:
        ret = arch_do_dom0_op(op,u_dom0_op);

    }

    TRACE_5D(TRC_DOM0OP_LEAVE_BASE + op->cmd, ret,
             op->u.dummy[0], op->u.dummy[1], op->u.dummy[2], op->u.dummy[3]);


    return ret;
}

/*
 * Local variables:
 * mode: C
 * c-set-style: "BSD"
 * c-basic-offset: 4
 * tab-width: 4
 * indent-tabs-mode: nil
 * End:
 */


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