static long privcmd_ioctl_hypercall(void __user *udata)
{
struct privcmd_hypercall hypercall;
long ret;
if (copy_from_user(&hypercall, udata, sizeof(hypercall)))
return -EFAULT;
ret = privcmd_call(hypercall.op,
hypercall.arg[0], hypercall.arg[1],
hypercall.arg[2], hypercall.arg[3],
hypercall.arg[4]);
return ret;
}
static long privcmd_ioctl_hypercall(struct file *file, void __user *udata)
{
struct privcmd_data *data = file->private_data;
struct privcmd_hypercall hypercall;
long ret;
/* Disallow arbitrary hypercalls if restricted */
if (data->domid != DOMID_INVALID)
return -EPERM;
if (copy_from_user(&hypercall, udata, sizeof(hypercall)))
return -EFAULT;
xen_preemptible_hcall_begin();
ret = privcmd_call(hypercall.op,
hypercall.arg[0], hypercall.arg[1],
hypercall.arg[2], hypercall.arg[3],
hypercall.arg[4]);
xen_preemptible_hcall_end();
return ret;
}
void xen_mc_flush(void)
{
struct mc_buffer *b = &__get_cpu_var(mc_buffer);
struct multicall_entry *mc;
int ret = 0;
unsigned long flags;
int i;
BUG_ON(preemptible());
/* Disable interrupts in case someone comes in and queues
something in the middle */
local_irq_save(flags);
trace_xen_mc_flush(b->mcidx, b->argidx, b->cbidx);
switch (b->mcidx) {
case 0:
/* no-op */
BUG_ON(b->argidx != 0);
break;
case 1:
/* Singleton multicall - bypass multicall machinery
and just do the call directly. */
mc = &b->entries[0];
mc->result = privcmd_call(mc->op,
mc->args[0], mc->args[1], mc->args[2],
mc->args[3], mc->args[4]);
ret = mc->result < 0;
break;
default:
#if MC_DEBUG
memcpy(b->debug, b->entries,
b->mcidx * sizeof(struct multicall_entry));
#endif
if (HYPERVISOR_multicall(b->entries, b->mcidx) != 0)
BUG();
for (i = 0; i < b->mcidx; i++)
if (b->entries[i].result < 0)
ret++;
#if MC_DEBUG
if (ret) {
printk(KERN_ERR "%d multicall(s) failed: cpu %d\n",
ret, smp_processor_id());
dump_stack();
for (i = 0; i < b->mcidx; i++) {
printk(KERN_DEBUG " call %2d/%d: op=%lu arg=[%lx] result=%ld\t%pF\n",
i+1, b->mcidx,
b->debug[i].op,
b->debug[i].args[0],
b->entries[i].result,
b->caller[i]);
}
}
#endif
}
b->mcidx = 0;
b->argidx = 0;
for (i = 0; i < b->cbidx; i++) {
struct callback *cb = &b->callbacks[i];
(*cb->fn)(cb->data);
}
b->cbidx = 0;
local_irq_restore(flags);
WARN_ON(ret);
}
