mirror of
https://github.com/xen-project/xen.git
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Paul Durrant
5823d6eb40
Commit 8ef5f344d0 "tools/libxendevicemodel: add a call to restrict the
handle" added a function to the devicemodel interface to restrict
operations through the API to a specific domain, where a capable under-
lying privcmd driver exists.
This patch adds similar functionality to the xenforeignmemory API. This
will be necessary (as much as xendevicemodel restriction) for limiting
the scope of device models to specific domains.
NOTE: My patch to the linux kernel [1] added the appropriate checks to
the foreign memory ioctls.
[1] https://git.kernel.org/cgit/linux/kernel/git/ostr/linux.git/commit/?id=4610d240
Signed-off-by: Paul Durrant <paul.durrant@citrix.com>
Acked-by: Wei Liu <wei.liu2@citrix.com>
115 lines
2.8 KiB
C
115 lines
2.8 KiB
C
/******************************************************************************
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*
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* Copyright 2006 Sun Microsystems, Inc. All rights reserved.
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* Use is subject to license terms.
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation;
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* version 2.1 of the License.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <errno.h>
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#include <fcntl.h>
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#include <stdint.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include <sys/mman.h>
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#include <sys/ioctl.h>
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#include "private.h"
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#define PRIVCMD_DEV "/dev/xen/privcmd"
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int osdep_xenforeignmemory_open(xenforeignmemory_handle *fmem)
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{
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int fd = open(PRIVCMD_DEV, O_RDWR|O_CLOEXEC);
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if ( fd == -1 )
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{
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PERROR("Could not obtain handle on privileged command interface "
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PRIVCMD_DEV);
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return -1;
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}
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fmem->fd = fd;
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return 0;
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}
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int osdep_xenforeignmemory_close(xenforeignmemory_handle *fmem)
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{
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int fd = fmem->fd;
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if ( fd == -1 )
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return 0;
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return close(fd);
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}
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void *osdep_xenforeignmemory_map(xenforeignmemory_handle *fmem,
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uint32_t dom, int prot,
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size_t num,
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const xen_pfn_t arr[/*num*/], int err[/*num*/])
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{
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int fd = fmem->fd;
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privcmd_mmapbatch_t ioctlx;
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void *addr;
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int rc;
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addr = mmap(NULL, num << PAGE_SHIFT, prot, MAP_SHARED, fd, 0);
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if ( addr == MAP_FAILED )
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{
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PERROR("xc_map_foreign_bulk: mmap failed");
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return NULL;
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}
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ioctlx.num = num;
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ioctlx.dom = dom;
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ioctlx.addr = (unsigned long)addr;
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ioctlx.arr = arr;
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ioctlx.err = err;
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rc = ioctl(fd, IOCTL_PRIVCMD_MMAPBATCH, &ioctlx);
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if ( rc < 0 )
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{
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int saved_errno = errno;
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PERROR("xc_map_foreign_bulk: ioctl failed");
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(void)munmap(addr, num << PAGE_SHIFT);
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errno = saved_errno;
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return NULL;
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}
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return addr;
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}
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int osdep_xenforeignmemory_unmap(xenforeignmemory_handle *fmem,
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void *addr, size_t num)
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{
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return munmap(addr, num << PAGE_SHIFT);
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}
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int osdep_xenforeignmemory_restrict(xenforeignmemory_handle *fmem,
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domid_t domid)
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{
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errno = -EOPNOTSUPP;
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return -1;
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}
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/*
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* Local variables:
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* mode: C
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* c-file-style: "BSD"
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* c-basic-offset: 4
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* tab-width: 4
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* indent-tabs-mode: nil
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* End:
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*/
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