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/******************************************************************************
*
* Copyright (c) 2007-2008, D G Murray <Derek.Murray@cl.cam.ac.uk>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation;
* version 2.1 of the License.
*
* This library 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; If not, see <http://www.gnu.org/licenses/>.
*/
#include "xc_private.h"
int xc_gnttab_op(xc_interface *xch, int cmd, void * op, int op_size, int count)
{
int ret = 0;
DECLARE_HYPERCALL_BOUNCE(op, count * op_size, XC_HYPERCALL_BUFFER_BOUNCE_BOTH);
if ( xc_hypercall_bounce_pre(xch, op) )
{
PERROR("Could not bounce buffer for grant table op hypercall");
goto out1;
}
ret = xencall3(xch->xcall, __HYPERVISOR_grant_table_op,
cmd, HYPERCALL_BUFFER_AS_ARG(op), count);
xc_hypercall_bounce_post(xch, op);
out1:
return ret;
}
int xc_gnttab_query_size(xc_interface *xch, struct gnttab_query_size *query)
{
int rc;
rc = xc_gnttab_op(xch, GNTTABOP_query_size, query, sizeof(*query), 1);
if ( rc || (query->status != GNTST_okay) )
ERROR("Could not query dom %u's grant size\n", query->dom);
return rc;
}
int xc_gnttab_get_version(xc_interface *xch, uint32_t domid)
{
struct gnttab_get_version query;
int rc;
query.dom = domid;
rc = xc_gnttab_op(xch, GNTTABOP_get_version, &query, sizeof(query),
1);
if ( rc < 0 )
return rc;
else
return query.version;
}
static void *_gnttab_map_table(xc_interface *xch, uint32_t domid, int *gnt_num)
{
int rc, i;
struct gnttab_query_size query;
struct gnttab_setup_table setup;
DECLARE_HYPERCALL_BUFFER(unsigned long, frame_list);
xen_pfn_t *pfn_list = NULL;
grant_entry_v1_t *gnt = NULL;
if ( !gnt_num )
return NULL;
query.dom = domid;
rc = xc_gnttab_op(xch, GNTTABOP_query_size, &query, sizeof(query), 1);
if ( rc || (query.status != GNTST_okay) )
{
ERROR("Could not query dom%d's grant size\n", domid);
return NULL;
}
*gnt_num = query.nr_frames * (PAGE_SIZE / sizeof(grant_entry_v1_t) );
frame_list = xc_hypercall_buffer_alloc(xch, frame_list, query.nr_frames * sizeof(unsigned long));
if ( !frame_list )
{
ERROR("Could not allocate frame_list in xc_gnttab_map_table\n");
return NULL;
}
pfn_list = malloc(query.nr_frames * sizeof(xen_pfn_t));
if ( !pfn_list )
{
ERROR("Could not allocate pfn_list in xc_gnttab_map_table\n");
goto err;
}
setup.dom = domid;
setup.nr_frames = query.nr_frames;
set_xen_guest_handle(setup.frame_list, frame_list);
/* XXX Any race with other setup_table hypercall? */
rc = xc_gnttab_op(xch, GNTTABOP_setup_table, &setup, sizeof(setup),
1);
if ( rc || (setup.status != GNTST_okay) )
{
ERROR("Could not get grant table frame list\n");
goto err;
}
for ( i = 0; i < setup.nr_frames; i++ )
pfn_list[i] = frame_list[i];
gnt = xc_map_foreign_pages(xch, domid, PROT_READ, pfn_list,
setup.nr_frames);
if ( !gnt )
{
ERROR("Could not map grant table\n");
goto err;
}
err:
if ( frame_list )
xc_hypercall_buffer_free(xch, frame_list);
free(pfn_list);
return gnt;
}
grant_entry_v1_t *xc_gnttab_map_table_v1(xc_interface *xch, uint32_t domid,
int *gnt_num)
{
if (xc_gnttab_get_version(xch, domid) == 2)
return NULL;
return _gnttab_map_table(xch, domid, gnt_num);
}
grant_entry_v2_t *xc_gnttab_map_table_v2(xc_interface *xch, uint32_t domid,
int *gnt_num)
{
if (xc_gnttab_get_version(xch, domid) != 2)
return NULL;
return _gnttab_map_table(xch, domid, gnt_num);
}
/*
* Local variables:
* mode: C
* c-file-style: "BSD"
* c-basic-offset: 4
* tab-width: 4
* indent-tabs-mode: nil
* End:
*/
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