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/******************************************************************************
*
* Copyright 2006 Sun Microsystems, Inc. All rights reserved.
* Use is subject to license terms.
*
* 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 <unistd.h>
#include <fcntl.h>
#include <errno.h>
#include <sys/mman.h>
#include <sys/ioctl.h>
#include "private.h"
int osdep_xenforeignmemory_open(xenforeignmemory_handle *fmem)
{
int flags, saved_errno;
int fd = open("/kern/xen/privcmd", O_RDWR);
if ( fd == -1 )
{
PERROR("Could not obtain handle on privileged command interface");
return -1;
}
/* Although we return the file handle as the 'xc handle' the API
does not specify / guarentee that this integer is in fact
a file handle. Thus we must take responsiblity to ensure
it doesn't propagate (ie leak) outside the process */
if ( (flags = fcntl(fd, F_GETFD)) < 0 )
{
PERROR("Could not get file handle flags");
goto error;
}
flags |= FD_CLOEXEC;
if ( fcntl(fd, F_SETFD, flags) < 0 )
{
PERROR("Could not set file handle flags");
goto error;
}
fmem->fd = fd;
return 0;
error:
saved_errno = errno;
close(fd);
errno = saved_errno;
return -1;
}
int osdep_xenforeignmemory_close(xenforeignmemory_handle *fmem)
{
int fd = fmem->fd;
return close(fd);
}
void *osdep_xenforeignmemory_map(xenforeignmemory_handle *fmem,
uint32_t dom, void *addr,
int prot, int flags, size_t num,
const xen_pfn_t arr[/*num*/], int err[/*num*/])
{
int fd = fmem->fd;
privcmd_mmapbatch_v2_t ioctlx;
addr = mmap(addr, num * XC_PAGE_SIZE, prot,
flags | MAP_ANON | MAP_SHARED, -1, 0);
if ( addr == MAP_FAILED ) {
PERROR("osdep_xenforeignmemory_map: mmap failed");
return NULL;
}
ioctlx.num=num;
ioctlx.dom=dom;
ioctlx.addr=(unsigned long)addr;
ioctlx.arr=arr;
ioctlx.err=err;
if ( ioctl(fd, IOCTL_PRIVCMD_MMAPBATCH_V2, &ioctlx) < 0 )
{
int saved_errno = errno;
PERROR("osdep_xenforeignmemory_map: ioctl failed");
munmap(addr, num * XC_PAGE_SIZE);
errno = saved_errno;
return NULL;
}
return addr;
}
int osdep_xenforeignmemory_unmap(xenforeignmemory_handle *fmem,
void *addr, size_t num)
{
return munmap(addr, num * XC_PAGE_SIZE);
}
int osdep_xenforeignmemory_restrict(xenforeignmemory_handle *fmem,
domid_t domid)
{
errno = EOPNOTSUPP;
return -1;
}
int osdep_xenforeignmemory_unmap_resource(
xenforeignmemory_handle *fmem, xenforeignmemory_resource_handle *fres)
{
return fres ? munmap(fres->addr, fres->nr_frames << XC_PAGE_SHIFT) : 0;
}
int osdep_xenforeignmemory_map_resource(
xenforeignmemory_handle *fmem, xenforeignmemory_resource_handle *fres)
{
privcmd_mmap_resource_t mr = {
.dom = fres->domid,
.type = fres->type,
.id = fres->id,
.idx = fres->frame,
.num = fres->nr_frames,
};
int rc;
if ( !fres->addr && !fres->nr_frames )
/* Request for resource size. Skip mmap(). */
goto skip_mmap;
fres->addr = mmap(fres->addr, fres->nr_frames << XC_PAGE_SHIFT,
fres->prot, fres->flags | MAP_ANON | MAP_SHARED, -1, 0);
if ( fres->addr == MAP_FAILED )
return -1;
mr.addr = (uintptr_t)fres->addr;
skip_mmap:
rc = ioctl(fmem->fd, IOCTL_PRIVCMD_MMAP_RESOURCE, &mr);
if ( rc )
{
if ( errno == ENOSYS )
errno = EOPNOTSUPP;
if ( fres->addr )
{
int saved_errno = errno;
osdep_xenforeignmemory_unmap_resource(fmem, fres);
errno = saved_errno;
}
return -1;
}
/* If requesting size, copy back. */
if ( !fres->addr )
fres->nr_frames = mr.num;
return 0;
}
/*
* Local variables:
* mode: C
* c-file-style: "BSD"
* c-basic-offset: 4
* tab-width: 4
* indent-tabs-mode: nil
* End:
*/
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