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xcom_hcall.c

/*
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 *
 *          Tristan Gingold <tristan.gingold@bull.net>
 *
 *          Copyright (c) 2007
 *          Isaku Yamahata <yamahata at valinux co jp>
 *                          VA Linux Systems Japan K.K.
 *          consolidate mini and inline version.
 */

#include <linux/module.h>
#include <xen/interface/xen.h>
#include <xen/interface/memory.h>
#include <xen/interface/grant_table.h>
#include <xen/interface/callback.h>
#include <xen/interface/vcpu.h>
#include <asm/xen/hypervisor.h>
#include <asm/xen/xencomm.h>

/* Xencomm notes:
 * This file defines hypercalls to be used by xencomm.  The hypercalls simply
 * create inlines or mini descriptors for pointers and then call the raw arch
 * hypercall xencomm_arch_hypercall_XXX
 *
 * If the arch wants to directly use these hypercalls, simply define macros
 * in asm/xen/hypercall.h, eg:
 *  #define HYPERVISOR_sched_op xencomm_hypercall_sched_op
 *
 * The arch may also define HYPERVISOR_xxx as a function and do more operations
 * before/after doing the hypercall.
 *
 * Note: because only inline or mini descriptors are created these functions
 * must only be called with in kernel memory parameters.
 */

int
xencomm_hypercall_console_io(int cmd, int count, char *str)
{
      /* xen early printk uses console io hypercall before
       * xencomm initialization. In that case, we just ignore it.
       */
      if (!xencomm_is_initialized())
            return 0;

      return xencomm_arch_hypercall_console_io
            (cmd, count, xencomm_map_no_alloc(str, count));
}
EXPORT_SYMBOL_GPL(xencomm_hypercall_console_io);

int
xencomm_hypercall_event_channel_op(int cmd, void *op)
{
      struct xencomm_handle *desc;
      desc = xencomm_map_no_alloc(op, sizeof(struct evtchn_op));
      if (desc == NULL)
            return -EINVAL;

      return xencomm_arch_hypercall_event_channel_op(cmd, desc);
}
EXPORT_SYMBOL_GPL(xencomm_hypercall_event_channel_op);

int
xencomm_hypercall_xen_version(int cmd, void *arg)
{
      struct xencomm_handle *desc;
      unsigned int argsize;

      switch (cmd) {
      case XENVER_version:
            /* do not actually pass an argument */
            return xencomm_arch_hypercall_xen_version(cmd, 0);
      case XENVER_extraversion:
            argsize = sizeof(struct xen_extraversion);
            break;
      case XENVER_compile_info:
            argsize = sizeof(struct xen_compile_info);
            break;
      case XENVER_capabilities:
            argsize = sizeof(struct xen_capabilities_info);
            break;
      case XENVER_changeset:
            argsize = sizeof(struct xen_changeset_info);
            break;
      case XENVER_platform_parameters:
            argsize = sizeof(struct xen_platform_parameters);
            break;
      case XENVER_get_features:
            argsize = (arg == NULL) ? 0 : sizeof(struct xen_feature_info);
            break;

      default:
            printk(KERN_DEBUG
                   "%s: unknown version op %d\n", __func__, cmd);
            return -ENOSYS;
      }

      desc = xencomm_map_no_alloc(arg, argsize);
      if (desc == NULL)
            return -EINVAL;

      return xencomm_arch_hypercall_xen_version(cmd, desc);
}
EXPORT_SYMBOL_GPL(xencomm_hypercall_xen_version);

int
xencomm_hypercall_physdev_op(int cmd, void *op)
{
      unsigned int argsize;

      switch (cmd) {
      case PHYSDEVOP_apic_read:
      case PHYSDEVOP_apic_write:
            argsize = sizeof(struct physdev_apic);
            break;
      case PHYSDEVOP_alloc_irq_vector:
      case PHYSDEVOP_free_irq_vector:
            argsize = sizeof(struct physdev_irq);
            break;
      case PHYSDEVOP_irq_status_query:
            argsize = sizeof(struct physdev_irq_status_query);
            break;

      default:
            printk(KERN_DEBUG
                   "%s: unknown physdev op %d\n", __func__, cmd);
            return -ENOSYS;
      }

      return xencomm_arch_hypercall_physdev_op
            (cmd, xencomm_map_no_alloc(op, argsize));
}

static int
xencommize_grant_table_op(struct xencomm_mini **xc_area,
                    unsigned int cmd, void *op, unsigned int count,
                    struct xencomm_handle **desc)
{
      struct xencomm_handle *desc1;
      unsigned int argsize;

      switch (cmd) {
      case GNTTABOP_map_grant_ref:
            argsize = sizeof(struct gnttab_map_grant_ref);
            break;
      case GNTTABOP_unmap_grant_ref:
            argsize = sizeof(struct gnttab_unmap_grant_ref);
            break;
      case GNTTABOP_setup_table:
      {
            struct gnttab_setup_table *setup = op;

            argsize = sizeof(*setup);

            if (count != 1)
                  return -EINVAL;
            desc1 = __xencomm_map_no_alloc
                  (xen_guest_handle(setup->frame_list),
                   setup->nr_frames *
                   sizeof(*xen_guest_handle(setup->frame_list)),
                   *xc_area);
            if (desc1 == NULL)
                  return -EINVAL;
            (*xc_area)++;
            set_xen_guest_handle(setup->frame_list, (void *)desc1);
            break;
      }
      case GNTTABOP_dump_table:
            argsize = sizeof(struct gnttab_dump_table);
            break;
      case GNTTABOP_transfer:
            argsize = sizeof(struct gnttab_transfer);
            break;
      case GNTTABOP_copy:
            argsize = sizeof(struct gnttab_copy);
            break;
      case GNTTABOP_query_size:
            argsize = sizeof(struct gnttab_query_size);
            break;
      default:
            printk(KERN_DEBUG "%s: unknown hypercall grant table op %d\n",
                   __func__, cmd);
            BUG();
      }

      *desc = __xencomm_map_no_alloc(op, count * argsize, *xc_area);
      if (*desc == NULL)
            return -EINVAL;
      (*xc_area)++;

      return 0;
}

int
xencomm_hypercall_grant_table_op(unsigned int cmd, void *op,
                         unsigned int count)
{
      int rc;
      struct xencomm_handle *desc;
      XENCOMM_MINI_ALIGNED(xc_area, 2);

      rc = xencommize_grant_table_op(&xc_area, cmd, op, count, &desc);
      if (rc)
            return rc;

      return xencomm_arch_hypercall_grant_table_op(cmd, desc, count);
}
EXPORT_SYMBOL_GPL(xencomm_hypercall_grant_table_op);

int
xencomm_hypercall_sched_op(int cmd, void *arg)
{
      struct xencomm_handle *desc;
      unsigned int argsize;

      switch (cmd) {
      case SCHEDOP_yield:
      case SCHEDOP_block:
            argsize = 0;
            break;
      case SCHEDOP_shutdown:
            argsize = sizeof(struct sched_shutdown);
            break;
      case SCHEDOP_poll:
      {
            struct sched_poll *poll = arg;
            struct xencomm_handle *ports;

            argsize = sizeof(struct sched_poll);
            ports = xencomm_map_no_alloc(xen_guest_handle(poll->ports),
                             sizeof(*xen_guest_handle(poll->ports)));

            set_xen_guest_handle(poll->ports, (void *)ports);
            break;
      }
      default:
            printk(KERN_DEBUG "%s: unknown sched op %d\n", __func__, cmd);
            return -ENOSYS;
      }

      desc = xencomm_map_no_alloc(arg, argsize);
      if (desc == NULL)
            return -EINVAL;

      return xencomm_arch_hypercall_sched_op(cmd, desc);
}
EXPORT_SYMBOL_GPL(xencomm_hypercall_sched_op);

int
xencomm_hypercall_multicall(void *call_list, int nr_calls)
{
      int rc;
      int i;
      struct multicall_entry *mce;
      struct xencomm_handle *desc;
      XENCOMM_MINI_ALIGNED(xc_area, nr_calls * 2);

      for (i = 0; i < nr_calls; i++) {
            mce = (struct multicall_entry *)call_list + i;

            switch (mce->op) {
            case __HYPERVISOR_update_va_mapping:
            case __HYPERVISOR_mmu_update:
                  /* No-op on ia64.  */
                  break;
            case __HYPERVISOR_grant_table_op:
                  rc = xencommize_grant_table_op
                        (&xc_area,
                         mce->args[0], (void *)mce->args[1],
                         mce->args[2], &desc);
                  if (rc)
                        return rc;
                  mce->args[1] = (unsigned long)desc;
                  break;
            case __HYPERVISOR_memory_op:
            default:
                  printk(KERN_DEBUG
                         "%s: unhandled multicall op entry op %lu\n",
                         __func__, mce->op);
                  return -ENOSYS;
            }
      }

      desc = xencomm_map_no_alloc(call_list,
                            nr_calls * sizeof(struct multicall_entry));
      if (desc == NULL)
            return -EINVAL;

      return xencomm_arch_hypercall_multicall(desc, nr_calls);
}
EXPORT_SYMBOL_GPL(xencomm_hypercall_multicall);

int
xencomm_hypercall_callback_op(int cmd, void *arg)
{
      unsigned int argsize;
      switch (cmd) {
      case CALLBACKOP_register:
            argsize = sizeof(struct callback_register);
            break;
      case CALLBACKOP_unregister:
            argsize = sizeof(struct callback_unregister);
            break;
      default:
            printk(KERN_DEBUG
                   "%s: unknown callback op %d\n", __func__, cmd);
            return -ENOSYS;
      }

      return xencomm_arch_hypercall_callback_op
            (cmd, xencomm_map_no_alloc(arg, argsize));
}

static int
xencommize_memory_reservation(struct xencomm_mini *xc_area,
                        struct xen_memory_reservation *mop)
{
      struct xencomm_handle *desc;

      desc = __xencomm_map_no_alloc(xen_guest_handle(mop->extent_start),
                  mop->nr_extents *
                  sizeof(*xen_guest_handle(mop->extent_start)),
                  xc_area);
      if (desc == NULL)
            return -EINVAL;

      set_xen_guest_handle(mop->extent_start, (void *)desc);
      return 0;
}

int
xencomm_hypercall_memory_op(unsigned int cmd, void *arg)
{
      GUEST_HANDLE(xen_pfn_t) extent_start_va[2] = { {NULL}, {NULL} };
      struct xen_memory_reservation *xmr = NULL;
      int rc;
      struct xencomm_handle *desc;
      unsigned int argsize;
      XENCOMM_MINI_ALIGNED(xc_area, 2);

      switch (cmd) {
      case XENMEM_increase_reservation:
      case XENMEM_decrease_reservation:
      case XENMEM_populate_physmap:
            xmr = (struct xen_memory_reservation *)arg;
            set_xen_guest_handle(extent_start_va[0],
                             xen_guest_handle(xmr->extent_start));

            argsize = sizeof(*xmr);
            rc = xencommize_memory_reservation(xc_area, xmr);
            if (rc)
                  return rc;
            xc_area++;
            break;

      case XENMEM_maximum_ram_page:
            argsize = 0;
            break;

      case XENMEM_add_to_physmap:
            argsize = sizeof(struct xen_add_to_physmap);
            break;

      default:
            printk(KERN_DEBUG "%s: unknown memory op %d\n", __func__, cmd);
            return -ENOSYS;
      }

      desc = xencomm_map_no_alloc(arg, argsize);
      if (desc == NULL)
            return -EINVAL;

      rc = xencomm_arch_hypercall_memory_op(cmd, desc);

      switch (cmd) {
      case XENMEM_increase_reservation:
      case XENMEM_decrease_reservation:
      case XENMEM_populate_physmap:
            set_xen_guest_handle(xmr->extent_start,
                             xen_guest_handle(extent_start_va[0]));
            break;
      }

      return rc;
}
EXPORT_SYMBOL_GPL(xencomm_hypercall_memory_op);

int
xencomm_hypercall_suspend(unsigned long srec)
{
      struct sched_shutdown arg;

      arg.reason = SHUTDOWN_suspend;

      return xencomm_arch_hypercall_sched_op(
            SCHEDOP_shutdown, xencomm_map_no_alloc(&arg, sizeof(arg)));
}

long
xencomm_hypercall_vcpu_op(int cmd, int cpu, void *arg)
{
      unsigned int argsize;
      switch (cmd) {
      case VCPUOP_register_runstate_memory_area: {
            struct vcpu_register_runstate_memory_area *area =
                  (struct vcpu_register_runstate_memory_area *)arg;
            argsize = sizeof(*arg);
            set_xen_guest_handle(area->addr.h,
                 (void *)xencomm_map_no_alloc(area->addr.v,
                                      sizeof(area->addr.v)));
            break;
      }

      default:
            printk(KERN_DEBUG "%s: unknown vcpu op %d\n", __func__, cmd);
            return -ENOSYS;
      }

      return xencomm_arch_hypercall_vcpu_op(cmd, cpu,
                              xencomm_map_no_alloc(arg, argsize));
}

long
xencomm_hypercall_opt_feature(void *arg)
{
      return xencomm_arch_hypercall_opt_feature(
            xencomm_map_no_alloc(arg,
                             sizeof(struct xen_ia64_opt_feature)));
}

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