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); }