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https://github.com/xen-project/xen.git
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Ian Campbell
7a3543df83
The alternative backend (a xen-api/xapi shim) is no longer around and so this stuff is now just baggage which is getting in the way of refactoring libxenctrl. Nested virt probably suffices for this use case now. This was the last component of the osdep infrastructure, so all the dynamic loading etc stuff all falls away too. As part of this I was forced to investigate the twisty xc_map_foreign_* maze, which I have added to the toolstack-library-apis doc in the hopes of doing something sensible. NetBSD and Solaris now call xc_map_foreign_bulk_compat directly from their xc_map_foreign_bulk, which could have been achieved by using some ifdefs around a renamed function. This will fall out in the wash when these functions move to their own library. Signed-off-by: Ian Campbell <ian.campbell@citrix.com> Acked-by: David Scott <dave.scott@citrix.com> Acked-by: Wei Liu <wei.liu2@citrix.com>
103 lines
2.4 KiB
C
103 lines
2.4 KiB
C
/******************************************************************************
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* xc_foreign_memory.c
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*
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* Functions for mapping foreign domain's memory.
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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 "xc_private.h"
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void *xc_map_foreign_pages(xc_interface *xch, uint32_t dom, int prot,
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const xen_pfn_t *arr, int num)
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{
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void *res;
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int i, *err;
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if (num < 0) {
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errno = EINVAL;
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return NULL;
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}
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err = malloc(num * sizeof(*err));
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if (!err)
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return NULL;
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res = xc_map_foreign_bulk(xch, dom, prot, arr, err, num);
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if (res) {
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for (i = 0; i < num; i++) {
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if (err[i]) {
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errno = -err[i];
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munmap(res, num * PAGE_SIZE);
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res = NULL;
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break;
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}
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}
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}
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free(err);
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return res;
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}
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/* stub for all not yet converted OSes */
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void *xc_map_foreign_bulk_compat(xc_interface *xch,
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uint32_t dom, int prot,
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const xen_pfn_t *arr, int *err, unsigned int num)
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{
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xen_pfn_t *pfn;
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unsigned int i;
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void *ret;
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if ((int)num <= 0) {
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errno = EINVAL;
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return NULL;
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}
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pfn = malloc(num * sizeof(*pfn));
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if (!pfn) {
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errno = ENOMEM;
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return NULL;
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}
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memcpy(pfn, arr, num * sizeof(*arr));
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ret = xc_map_foreign_batch(xch, dom, prot, pfn, num);
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if (ret) {
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for (i = 0; i < num; ++i)
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switch (pfn[i] ^ arr[i]) {
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case 0:
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err[i] = 0;
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break;
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default:
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err[i] = -EINVAL;
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break;
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}
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} else
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memset(err, 0, num * sizeof(*err));
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free(pfn);
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return ret;
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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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