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/******************************************************************************
* dom0_ops.c
*
* Process command requests from domain-0 guest OS.
*
* Copyright (c) 2002, K A Fraser
*/
#include <xeno/config.h>
#include <xeno/types.h>
#include <xeno/lib.h>
#include <xeno/mm.h>
#include <xeno/dom0_ops.h>
#include <xeno/sched.h>
#include <xeno/event.h>
#include <asm/domain_page.h>
extern unsigned int alloc_new_dom_mem(struct task_struct *, unsigned int);
/* Basically used to protect the domain-id space. */
static spinlock_t create_dom_lock = SPIN_LOCK_UNLOCKED;
static unsigned int get_domnr(void)
{
static unsigned int domnr = 0;
struct task_struct *p;
int tries = 0;
for ( tries = 0; tries < 1024; tries++ )
{
domnr = (domnr+1) & ((1<<20)-1);
if ( (p = find_domain_by_id(domnr)) == NULL )
return domnr;
put_task_struct(p);
}
return 0;
}
static void build_page_list(struct task_struct *p)
{
unsigned long *list;
unsigned long curr;
struct list_head *list_ent;
curr = list_entry(p->pg_head.next, struct pfn_info, list) - frame_table;
list = (unsigned long *)map_domain_mem(curr << PAGE_SHIFT);
list_for_each(list_ent, &p->pg_head)
{
*list++ = list_entry(list_ent, struct pfn_info, list) - frame_table;
if( ((unsigned long)list & ~PAGE_MASK) == 0 )
{
struct list_head *ent = frame_table[curr].list.next;
curr = list_entry(ent, struct pfn_info, list) - frame_table;
unmap_domain_mem(list-1);
list = (unsigned long *)map_domain_mem(curr << PAGE_SHIFT);
}
}
unmap_domain_mem(list);
}
long do_dom0_op(dom0_op_t *u_dom0_op)
{
long ret = 0;
dom0_op_t op;
if ( current->domain != 0 )
return -EPERM;
if ( copy_from_user(&op, u_dom0_op, sizeof(op)) )
return -EFAULT;
switch ( op.cmd )
{
case DOM0_BUILDDOMAIN:
{
struct task_struct * p = find_domain_by_id(op.u.meminfo.domain);
ret = -EINVAL;
if ( p != NULL )
{
if ( (ret = final_setup_guestos(p, &op.u.meminfo)) == 0 )
ret = p->domain;
put_task_struct(p);
}
}
break;
case DOM0_STARTDOMAIN:
{
struct task_struct * p = find_domain_by_id(op.u.meminfo.domain);
ret = -EINVAL;
if ( p != NULL )
{
if ( (p->flags & PF_CONSTRUCTED) != 0 )
{
wake_up(p);
reschedule(p);
ret = p->domain;
}
put_task_struct(p);
}
}
break;
case DOM0_STOPDOMAIN:
{
ret = stop_other_domain(op.u.meminfo.domain);
}
break;
case DOM0_CREATEDOMAIN:
{
struct task_struct *p;
static unsigned int pro = 0;
unsigned int dom;
ret = -ENOMEM;
spin_lock_irq(&create_dom_lock);
if ( (dom = get_domnr()) == 0 )
goto exit_create;
pro = (pro+1) % smp_num_cpus;
p = do_newdomain(dom, pro);
if ( p == NULL )
goto exit_create;
if (op.u.newdomain.name[0]) {
strncpy (p -> name, op.u.newdomain.name, MAX_DOMAIN_NAME);
p -> name[MAX_DOMAIN_NAME - 1] = 0;
}
ret = alloc_new_dom_mem(p, op.u.newdomain.memory_kb);
if ( ret != 0 )
{
__kill_domain(p);
goto exit_create;
}
build_page_list(p);
ret = p->domain;
op.u.newdomain.domain = ret;
op.u.newdomain.pg_head =
list_entry(p->pg_head.next, struct pfn_info, list) -
frame_table;
copy_to_user(u_dom0_op, &op, sizeof(op));
exit_create:
spin_unlock_irq(&create_dom_lock);
}
break;
case DOM0_DESTROYDOMAIN:
{
unsigned int dom = op.u.killdomain.domain;
int force = op.u.killdomain.force;
ret = (dom == IDLE_DOMAIN_ID) ? -EPERM : kill_other_domain(dom, force);
}
break;
case DOM0_BVTCTL:
{
unsigned long ctx_allow = op.u.bvtctl.ctx_allow;
ret = sched_bvtctl(ctx_allow);
}
break;
case DOM0_ADJUSTDOM:
{
unsigned int dom = op.u.adjustdom.domain;
unsigned long mcu_adv = op.u.adjustdom.mcu_adv;
unsigned long warp = op.u.adjustdom.warp;
unsigned long warpl = op.u.adjustdom.warpl;
unsigned long warpu = op.u.adjustdom.warpu;
ret = -EPERM;
if ( dom != IDLE_DOMAIN_ID )
ret = sched_adjdom(dom, mcu_adv, warp, warpl, warpu);
}
break;
case DOM0_GETMEMLIST:
{
int i;
unsigned long pfn = op.u.getmemlist.start_pfn;
unsigned long *buffer = op.u.getmemlist.buffer;
struct list_head *list_ent;
for ( i = 0; i < op.u.getmemlist.num_pfns; i++ )
{
/* XXX We trust DOM0 to give us a safe buffer. XXX */
*buffer++ = pfn;
list_ent = frame_table[pfn].list.next;
pfn = list_entry(list_ent, struct pfn_info, list) - frame_table;
}
}
break;
case DOM0_GETDOMAININFO:
{
struct task_struct *p = &idle0_task;
u_long flags;
read_lock_irqsave (&tasklist_lock, flags);
while ( (p = p->next_task) != &idle0_task )
if ( !is_idle_task(p) && (p->domain >= op.u.getdominfo.domain) )
break;
if ( p == &idle0_task )
{
ret = -ESRCH;
}
else
{
op.u.getdominfo.domain = p->domain;
strcpy (op.u.getdominfo.name, p->name);
op.u.getdominfo.processor = p->processor;
op.u.getdominfo.has_cpu = p->has_cpu;
op.u.getdominfo.state = p->state;
op.u.getdominfo.hyp_events = p->hyp_events;
op.u.getdominfo.mcu_advance = p->mcu_advance;
op.u.getdominfo.pg_head =
list_entry(p->pg_head.next, struct pfn_info, list) -
frame_table;
op.u.getdominfo.tot_pages = p->tot_pages;
op.u.getdominfo.cpu_time = p->cpu_time;
}
read_unlock_irqrestore(&tasklist_lock, flags);
copy_to_user(u_dom0_op, &op, sizeof(op));
break;
}
default:
ret = -ENOSYS;
}
return ret;
}
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