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https://github.com/xen-project/xen.git
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Andres Lagar-Cavilla
447e175bad
This patch is the folded version of API updates, along with the associated tool changes to ensure that the build is always consistent. API updates: - The source domain in the sharing calls is no longer assumed to be dom0. - Previously, the mem sharing code would return an opaque handle to index shared pages (and nominees) in its global hash table. By removing the hash table, the handle becomes a version, to avoid sharing a stale version of a page. Thus, libxc wrappers and tools need to be updated to recall the share functions with the information needed to fetch the page (which they readily have). Tool updates: The only (in-tree, that we know of) consumer of the mem sharing API is the memshr tool. This is updated to use the new API. Signed-off-by: Andres Lagar-Cavilla <andres@lagarcavilla.org> Signed-off-by: Adin Scannell <adin@scannell.ca> Acked-by: Ian Campbell <ian.campbell@citrix.com> Committed-by: Tim Deegan <tim@xen.org>
116 lines
3.1 KiB
C
116 lines
3.1 KiB
C
/******************************************************************************
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*
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* Copyright (c) 2009 Citrix Systems, Inc. (Grzegorz Milos)
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program 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
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#ifndef __BIDIR_HASH_H__
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#define __BIDIR_HASH_H__
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#include <stdint.h>
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#include <string.h>
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#include "memshr-priv.h"
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typedef struct vbdblk {
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uint64_t sec;
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uint16_t disk_id;
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} vbdblk_t;
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#if defined FINGERPRINT_MAP || BLOCK_MAP
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#define DEFINE_SINGLE_MAP
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#endif
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/*******************************************************/
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/* Fingerprint map */
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/*******************************************************/
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#if defined FINGERPRINT_MAP || !defined DEFINE_SINGLE_MAP
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#undef BIDIR_NAME_PREFIX
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#undef BIDIR_KEY
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#undef BIDIR_VALUE
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#undef BIDIR_KEY_T
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#undef BIDIR_VALUE_T
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static uint32_t fgprtshr_fgprt_hash(uint32_t h)
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{
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return h;
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}
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static uint32_t fgprtshr_mfn_hash(uint64_t m)
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{
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return (uint32_t)m;
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}
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static int fgprtshr_fgprt_cmp(uint32_t h1, uint32_t h2)
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{
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return (h1 == h2);
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}
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static int fgprtshr_mfn_cmp(uint32_t m1, uint32_t m2)
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{
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return (m1 == m2);
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}
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#define BIDIR_NAME_PREFIX fgprtshr
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#define BIDIR_KEY fgprt
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#define BIDIR_VALUE mfn
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#define BIDIR_KEY_T uint32_t
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#define BIDIR_VALUE_T xen_mfn_t
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#include "bidir-namedefs.h"
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#endif /* FINGERPRINT_MAP */
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/*******************************************************/
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/* Block<->Memory sharing handles */
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/*******************************************************/
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#if defined BLOCK_MAP || !defined DEFINE_SINGLE_MAP
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#undef BIDIR_NAME_PREFIX
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#undef BIDIR_KEY
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#undef BIDIR_VALUE
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#undef BIDIR_KEY_T
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#undef BIDIR_VALUE_T
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/* TODO better hashes! */
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static inline uint32_t blockshr_block_hash(vbdblk_t block)
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{
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return (uint32_t)(block.sec) ^ (uint32_t)(block.disk_id);
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}
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static inline uint32_t blockshr_shrhnd_hash(share_tuple_t shrhnd)
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{
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return ((uint32_t) shrhnd.handle);
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}
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static inline int blockshr_block_cmp(vbdblk_t b1, vbdblk_t b2)
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{
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return (b1.sec == b2.sec) && (b1.disk_id == b2.disk_id);
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}
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static inline int blockshr_shrhnd_cmp(share_tuple_t h1, share_tuple_t h2)
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{
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return ( !memcmp(&h1, &h2, sizeof(share_tuple_t)) );
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}
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#define BIDIR_NAME_PREFIX blockshr
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#define BIDIR_KEY block
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#define BIDIR_VALUE shrhnd
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#define BIDIR_KEY_T vbdblk_t
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#define BIDIR_VALUE_T share_tuple_t
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#include "bidir-namedefs.h"
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#endif /* BLOCK_MAP */
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#endif /* __BIDIR_HASH_H__ */
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