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https://github.com/xen-project/xen.git
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Igor Druzhinin
143e0c2c2d
The new function repeats the behavior of the first version except it has an extended list of arguments which are subsequently passed to mmap() call. This is needed for QEMU depriviledging. Signed-off-by: Igor Druzhinin <igor.druzhinin@citrix.com> Reviewed-by: Andrew Cooper <andrew.cooper3@citrix.com> Acked-by: Wei Liu <wei.liu2@citrix.com>
119 lines
3.2 KiB
C
119 lines
3.2 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 <unistd.h>
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#include <fcntl.h>
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#include <sys/mman.h>
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#include "private.h"
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int osdep_xenforeignmemory_open(xenforeignmemory_handle *fmem)
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{
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int flags, saved_errno;
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int fd = open("/kern/xen/privcmd", O_RDWR);
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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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return -1;
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}
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/* Although we return the file handle as the 'xc handle' the API
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does not specify / guarentee that this integer is in fact
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a file handle. Thus we must take responsiblity to ensure
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it doesn't propagate (ie leak) outside the process */
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if ( (flags = fcntl(fd, F_GETFD)) < 0 )
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{
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PERROR("Could not get file handle flags");
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goto error;
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}
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flags |= FD_CLOEXEC;
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if ( fcntl(fd, F_SETFD, flags) < 0 )
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{
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PERROR("Could not set file handle flags");
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goto error;
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}
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fmem->fd = fd;
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return 0;
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error:
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saved_errno = errno;
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close(fd);
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errno = saved_errno;
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return -1;
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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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return close(fd);
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}
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void *osdep_map_foreign_batch(xenforeignmem_handle *fmem, uint32_t dom,
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void *addr, int prot, int flags,
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xen_pfn_t *arr, int 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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addr = mmap(addr, num*XC_PAGE_SIZE, prot, flags | MAP_ANON | MAP_SHARED, -1, 0);
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if ( addr == MAP_FAILED ) {
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PERROR("osdep_map_foreign_batch: 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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if ( ioctl(fd, IOCTL_PRIVCMD_MMAPBATCH, &ioctlx) < 0 )
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{
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int saved_errno = errno;
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PERROR("osdep_map_foreign_batch: ioctl failed");
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(void)munmap(addr, num*XC_PAGE_SIZE);
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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*XC_PAGE_SIZE);
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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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