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https://github.com/xen-project/xen.git
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Ian Campbell
bd1c1ea440
The existing xc_map_foreign_bulk-like interface encourages callers to miss error checking for partial failure (by forgetting to scan the err array). Add support for passing err==NULL which behaves in a xc_map_foreign_pages-like manner and returns a global error for any failure. While documenting this also clarify the overall behaviour and the behaviour with err!=NULL. With this the compat wrapper of xc_map_foreign_pages() can be simplified. Signed-off-by: Ian Campbell <ian.campbell@citrix.com> Acked-by: Wei Liu <wei.liu2@citrix.com> Acked-by: Ian Jackson <ian.jackson@eu.citrix.com>
99 lines
2.7 KiB
C
99 lines
2.7 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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#define XC_BUILDING_COMPAT_MAP_FOREIGN_API
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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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if (num < 0) {
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errno = EINVAL;
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return NULL;
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}
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return xenforeignmemory_map(xch->fmem, dom, prot, arr, NULL, num);
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}
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void *xc_map_foreign_range(xc_interface *xch,
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uint32_t dom, int size, int prot,
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unsigned long mfn)
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{
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xen_pfn_t *arr;
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int num;
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int i;
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void *ret;
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num = (size + XC_PAGE_SIZE - 1) >> XC_PAGE_SHIFT;
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arr = calloc(num, sizeof(xen_pfn_t));
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if ( arr == NULL )
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return NULL;
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for ( i = 0; i < num; i++ )
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arr[i] = mfn + i;
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ret = xc_map_foreign_pages(xch, dom, prot, arr, num);
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free(arr);
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return ret;
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}
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void *xc_map_foreign_ranges(xc_interface *xch,
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uint32_t dom, size_t size,
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int prot, size_t chunksize,
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privcmd_mmap_entry_t entries[],
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int nentries)
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{
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xen_pfn_t *arr;
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int num_per_entry;
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int num;
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int i;
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int j;
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void *ret;
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num_per_entry = chunksize >> XC_PAGE_SHIFT;
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num = num_per_entry * nentries;
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arr = calloc(num, sizeof(xen_pfn_t));
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if ( arr == NULL )
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return NULL;
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for ( i = 0; i < nentries; i++ )
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for ( j = 0; j < num_per_entry; j++ )
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arr[i * num_per_entry + j] = entries[i].mfn + j;
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ret = xc_map_foreign_pages(xch, dom, prot, arr, num);
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free(arr);
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return ret;
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}
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void *xc_map_foreign_bulk(xc_interface *xch, 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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return xenforeignmemory_map(xch->fmem, dom, prot, arr, err, num);
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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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