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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>
87 lines
1.9 KiB
C
87 lines
1.9 KiB
C
/*
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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 out from xc_minios.c
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*
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* Copyright 2007-2008 Samuel Thibault <samuel.thibault@eu.citrix.com>.
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*/
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#include <mini-os/types.h>
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#include <mini-os/os.h>
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#include <mini-os/mm.h>
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#include <mini-os/lib.h>
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#include <errno.h>
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#include <malloc.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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/* No fd required */
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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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return 0;
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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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multicall_entry_t call;
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int i, ret;
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call.op = hypercall->op;
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for (i = 0; i < 5; i++)
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call.args[i] = hypercall->arg[i];
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ret = HYPERVISOR_multicall(&call, 1);
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if (ret < 0) {
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errno = -ret;
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return -1;
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}
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if ((long) call.result < 0) {
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errno = - (long) call.result;
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return -1;
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}
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return call.result;
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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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return memalign(PAGE_SIZE, npages * PAGE_SIZE);
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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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free(ptr);
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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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