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https://github.com/xen-project/xen.git
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Jan Beulich
6409210a5f
Some hypercalls, memory-op in particular, can return values requiring more than 31 bits to represent. Hence the underlying layers need to make sure they won't truncate such values. (Note that for Solaris the function also gets renamed, to match the other OSes.) Due to them merely propagating ioctl()'s return value, this change is benign on Linux and Solaris. IOW there's an actual effect here only for the BSDs and MiniOS, but even then further adjustments are needed at the xencall<N>() level. Signed-off-by: Jan Beulich <jbeulich@suse.com> Acked-by: Andrew Cooper <andrew.cooper3@citrix.com> Acked-by: Ian Jackson <iwj@xenproject.org>
130 lines
3.1 KiB
C
130 lines
3.1 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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* Split from xc_netbsd.c
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*/
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#include <unistd.h>
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#include <fcntl.h>
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#include <malloc.h>
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#include <errno.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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int osdep_xencall_open(xencall_handle *xcall)
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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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xcall->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_xencall_close(xencall_handle *xcall)
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{
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int fd = xcall->fd;
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return close(fd);
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}
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void *osdep_alloc_pages(xencall_handle *xcall, size_t npages)
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{
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size_t size = npages * PAGE_SIZE;
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void *p;
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int ret;
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ret = posix_memalign(&p, PAGE_SIZE, size);
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if ( ret != 0 || !p )
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return NULL;
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if ( mlock(p, size) < 0 )
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{
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free(p);
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return NULL;
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}
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return p;
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}
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void osdep_free_pages(xencall_handle *xcall, void *ptr, size_t npages)
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{
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munlock(ptr, npages * PAGE_SIZE);
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free(ptr);
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}
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long osdep_hypercall(xencall_handle *xcall, privcmd_hypercall_t *hypercall)
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{
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int fd = xcall->fd;
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int error = ioctl(fd, IOCTL_PRIVCMD_HYPERCALL, hypercall);
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/*
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* Since NetBSD ioctl can only return 0 on success or < 0 on
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* error, if we want to return a value from ioctl we should
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* do so by setting hypercall->retval, to mimic Linux ioctl
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* implementation.
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*/
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if (error < 0)
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return error;
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else
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return hypercall->retval;
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}
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int xencall_buffers_never_fault(xencall_handle *xcall)
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{
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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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