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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>
124 lines
2.9 KiB
C
124 lines
2.9 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_freebsd_osdep.c
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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_xencall_open(xencall_handle *xcall)
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{
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int fd = open(PRIVCMD_DEV, O_RDWR|O_CLOEXEC);
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/*
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* This file descriptor is opaque to the caller, thus we are
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* polite and try and ensure it doesn't propagate (ie leak)
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* outside the process, by using O_CLOEXEC.
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*/
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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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xcall->fd = fd;
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return 0;
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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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if ( fd == -1 )
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return 0;
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return close(fd);
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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 ret;
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ret = ioctl(fd, IOCTL_PRIVCMD_HYPERCALL, hypercall);
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return (ret == 0) ? hypercall->retval : ret;
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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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/* Address returned by mmap is page aligned. */
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p = mmap(NULL, size, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS,
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-1, 0);
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if (p == NULL)
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return NULL;
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/*
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* Since FreeBSD doesn't have the MAP_LOCKED flag,
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* lock memory using mlock.
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*/
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if ( mlock(p, size) < 0 )
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{
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munmap(p, size);
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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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int saved_errno = errno;
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/* Unlock pages */
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munlock(ptr, npages * PAGE_SIZE);
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munmap(ptr, npages * PAGE_SIZE);
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/* We MUST propagate the hypercall errno, not unmap call's. */
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errno = saved_errno;
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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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