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Juergen Gross
171d6ecec1
Add a new function to query whether hypercall buffers are always safe to access by the hypervisor or might result in EFAULT. Signed-off-by: Juergen Gross <jgross@suse.com> Acked-by: Ian Jackson <ian.jackson@eu.citrix.com>
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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int 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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