1c2b38b27SPaolo Bonzini /* 2c2b38b27SPaolo Bonzini * Data plane event loop 3c2b38b27SPaolo Bonzini * 4c2b38b27SPaolo Bonzini * Copyright (c) 2003-2008 Fabrice Bellard 5c2b38b27SPaolo Bonzini * Copyright (c) 2009-2017 QEMU contributors 6c2b38b27SPaolo Bonzini * 7c2b38b27SPaolo Bonzini * Permission is hereby granted, free of charge, to any person obtaining a copy 8c2b38b27SPaolo Bonzini * of this software and associated documentation files (the "Software"), to deal 9c2b38b27SPaolo Bonzini * in the Software without restriction, including without limitation the rights 10c2b38b27SPaolo Bonzini * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell 11c2b38b27SPaolo Bonzini * copies of the Software, and to permit persons to whom the Software is 12c2b38b27SPaolo Bonzini * furnished to do so, subject to the following conditions: 13c2b38b27SPaolo Bonzini * 14c2b38b27SPaolo Bonzini * The above copyright notice and this permission notice shall be included in 15c2b38b27SPaolo Bonzini * all copies or substantial portions of the Software. 16c2b38b27SPaolo Bonzini * 17c2b38b27SPaolo Bonzini * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 18c2b38b27SPaolo Bonzini * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 19c2b38b27SPaolo Bonzini * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL 20c2b38b27SPaolo Bonzini * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 21c2b38b27SPaolo Bonzini * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, 22c2b38b27SPaolo Bonzini * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN 23c2b38b27SPaolo Bonzini * THE SOFTWARE. 24c2b38b27SPaolo Bonzini */ 25c2b38b27SPaolo Bonzini 26c2b38b27SPaolo Bonzini #include "qemu/osdep.h" 27c2b38b27SPaolo Bonzini #include "qapi/error.h" 28c2b38b27SPaolo Bonzini #include "block/aio.h" 29c2b38b27SPaolo Bonzini #include "block/thread-pool.h" 30c2b38b27SPaolo Bonzini #include "qemu/main-loop.h" 31c2b38b27SPaolo Bonzini #include "qemu/atomic.h" 328c6b0356SStefan Hajnoczi #include "qemu/rcu_queue.h" 33c2b38b27SPaolo Bonzini #include "block/raw-aio.h" 340c330a73SPaolo Bonzini #include "qemu/coroutine_int.h" 3547b74464SStefan Hajnoczi #include "qemu/coroutine-tls.h" 36*75bbe5e5SPavel Dovgalyuk #include "sysemu/cpu-timers.h" 370c330a73SPaolo Bonzini #include "trace.h" 38c2b38b27SPaolo Bonzini 39c2b38b27SPaolo Bonzini /***********************************************************/ 40c2b38b27SPaolo Bonzini /* bottom halves (can be seen as timers which expire ASAP) */ 41c2b38b27SPaolo Bonzini 428c6b0356SStefan Hajnoczi /* QEMUBH::flags values */ 438c6b0356SStefan Hajnoczi enum { 448c6b0356SStefan Hajnoczi /* Already enqueued and waiting for aio_bh_poll() */ 458c6b0356SStefan Hajnoczi BH_PENDING = (1 << 0), 468c6b0356SStefan Hajnoczi 478c6b0356SStefan Hajnoczi /* Invoke the callback */ 488c6b0356SStefan Hajnoczi BH_SCHEDULED = (1 << 1), 498c6b0356SStefan Hajnoczi 508c6b0356SStefan Hajnoczi /* Delete without invoking callback */ 518c6b0356SStefan Hajnoczi BH_DELETED = (1 << 2), 528c6b0356SStefan Hajnoczi 538c6b0356SStefan Hajnoczi /* Delete after invoking callback */ 548c6b0356SStefan Hajnoczi BH_ONESHOT = (1 << 3), 558c6b0356SStefan Hajnoczi 568c6b0356SStefan Hajnoczi /* Schedule periodically when the event loop is idle */ 578c6b0356SStefan Hajnoczi BH_IDLE = (1 << 4), 588c6b0356SStefan Hajnoczi }; 598c6b0356SStefan Hajnoczi 60c2b38b27SPaolo Bonzini struct QEMUBH { 61c2b38b27SPaolo Bonzini AioContext *ctx; 620f08586cSStefan Hajnoczi const char *name; 63c2b38b27SPaolo Bonzini QEMUBHFunc *cb; 64c2b38b27SPaolo Bonzini void *opaque; 658c6b0356SStefan Hajnoczi QSLIST_ENTRY(QEMUBH) next; 668c6b0356SStefan Hajnoczi unsigned flags; 67c2b38b27SPaolo Bonzini }; 68c2b38b27SPaolo Bonzini 698c6b0356SStefan Hajnoczi /* Called concurrently from any thread */ 708c6b0356SStefan Hajnoczi static void aio_bh_enqueue(QEMUBH *bh, unsigned new_flags) 718c6b0356SStefan Hajnoczi { 728c6b0356SStefan Hajnoczi AioContext *ctx = bh->ctx; 738c6b0356SStefan Hajnoczi unsigned old_flags; 748c6b0356SStefan Hajnoczi 758c6b0356SStefan Hajnoczi /* 76d73415a3SStefan Hajnoczi * The memory barrier implicit in qatomic_fetch_or makes sure that: 778c6b0356SStefan Hajnoczi * 1. idle & any writes needed by the callback are done before the 788c6b0356SStefan Hajnoczi * locations are read in the aio_bh_poll. 798c6b0356SStefan Hajnoczi * 2. ctx is loaded before the callback has a chance to execute and bh 808c6b0356SStefan Hajnoczi * could be freed. 818c6b0356SStefan Hajnoczi */ 82d73415a3SStefan Hajnoczi old_flags = qatomic_fetch_or(&bh->flags, BH_PENDING | new_flags); 838c6b0356SStefan Hajnoczi if (!(old_flags & BH_PENDING)) { 848c6b0356SStefan Hajnoczi QSLIST_INSERT_HEAD_ATOMIC(&ctx->bh_list, bh, next); 858c6b0356SStefan Hajnoczi } 868c6b0356SStefan Hajnoczi 878c6b0356SStefan Hajnoczi aio_notify(ctx); 88*75bbe5e5SPavel Dovgalyuk /* 89*75bbe5e5SPavel Dovgalyuk * Workaround for record/replay. 90*75bbe5e5SPavel Dovgalyuk * vCPU execution should be suspended when new BH is set. 91*75bbe5e5SPavel Dovgalyuk * This is needed to avoid guest timeouts caused 92*75bbe5e5SPavel Dovgalyuk * by the long cycles of the execution. 93*75bbe5e5SPavel Dovgalyuk */ 94*75bbe5e5SPavel Dovgalyuk icount_notify_exit(); 958c6b0356SStefan Hajnoczi } 968c6b0356SStefan Hajnoczi 978c6b0356SStefan Hajnoczi /* Only called from aio_bh_poll() and aio_ctx_finalize() */ 988c6b0356SStefan Hajnoczi static QEMUBH *aio_bh_dequeue(BHList *head, unsigned *flags) 998c6b0356SStefan Hajnoczi { 1008c6b0356SStefan Hajnoczi QEMUBH *bh = QSLIST_FIRST_RCU(head); 1018c6b0356SStefan Hajnoczi 1028c6b0356SStefan Hajnoczi if (!bh) { 1038c6b0356SStefan Hajnoczi return NULL; 1048c6b0356SStefan Hajnoczi } 1058c6b0356SStefan Hajnoczi 1068c6b0356SStefan Hajnoczi QSLIST_REMOVE_HEAD(head, next); 1078c6b0356SStefan Hajnoczi 1088c6b0356SStefan Hajnoczi /* 109d73415a3SStefan Hajnoczi * The qatomic_and is paired with aio_bh_enqueue(). The implicit memory 1108c6b0356SStefan Hajnoczi * barrier ensures that the callback sees all writes done by the scheduling 1118c6b0356SStefan Hajnoczi * thread. It also ensures that the scheduling thread sees the cleared 1128c6b0356SStefan Hajnoczi * flag before bh->cb has run, and thus will call aio_notify again if 1138c6b0356SStefan Hajnoczi * necessary. 1148c6b0356SStefan Hajnoczi */ 115d73415a3SStefan Hajnoczi *flags = qatomic_fetch_and(&bh->flags, 1168c6b0356SStefan Hajnoczi ~(BH_PENDING | BH_SCHEDULED | BH_IDLE)); 1178c6b0356SStefan Hajnoczi return bh; 1188c6b0356SStefan Hajnoczi } 1198c6b0356SStefan Hajnoczi 1200f08586cSStefan Hajnoczi void aio_bh_schedule_oneshot_full(AioContext *ctx, QEMUBHFunc *cb, 1210f08586cSStefan Hajnoczi void *opaque, const char *name) 122c2b38b27SPaolo Bonzini { 123c2b38b27SPaolo Bonzini QEMUBH *bh; 124c2b38b27SPaolo Bonzini bh = g_new(QEMUBH, 1); 125c2b38b27SPaolo Bonzini *bh = (QEMUBH){ 126c2b38b27SPaolo Bonzini .ctx = ctx, 127c2b38b27SPaolo Bonzini .cb = cb, 128c2b38b27SPaolo Bonzini .opaque = opaque, 1290f08586cSStefan Hajnoczi .name = name, 130c2b38b27SPaolo Bonzini }; 1318c6b0356SStefan Hajnoczi aio_bh_enqueue(bh, BH_SCHEDULED | BH_ONESHOT); 132c2b38b27SPaolo Bonzini } 133c2b38b27SPaolo Bonzini 1340f08586cSStefan Hajnoczi QEMUBH *aio_bh_new_full(AioContext *ctx, QEMUBHFunc *cb, void *opaque, 1350f08586cSStefan Hajnoczi const char *name) 136c2b38b27SPaolo Bonzini { 137c2b38b27SPaolo Bonzini QEMUBH *bh; 138c2b38b27SPaolo Bonzini bh = g_new(QEMUBH, 1); 139c2b38b27SPaolo Bonzini *bh = (QEMUBH){ 140c2b38b27SPaolo Bonzini .ctx = ctx, 141c2b38b27SPaolo Bonzini .cb = cb, 142c2b38b27SPaolo Bonzini .opaque = opaque, 1430f08586cSStefan Hajnoczi .name = name, 144c2b38b27SPaolo Bonzini }; 145c2b38b27SPaolo Bonzini return bh; 146c2b38b27SPaolo Bonzini } 147c2b38b27SPaolo Bonzini 148c2b38b27SPaolo Bonzini void aio_bh_call(QEMUBH *bh) 149c2b38b27SPaolo Bonzini { 150c2b38b27SPaolo Bonzini bh->cb(bh->opaque); 151c2b38b27SPaolo Bonzini } 152c2b38b27SPaolo Bonzini 1538c6b0356SStefan Hajnoczi /* Multiple occurrences of aio_bh_poll cannot be called concurrently. */ 154c2b38b27SPaolo Bonzini int aio_bh_poll(AioContext *ctx) 155c2b38b27SPaolo Bonzini { 1568c6b0356SStefan Hajnoczi BHListSlice slice; 1578c6b0356SStefan Hajnoczi BHListSlice *s; 1588c6b0356SStefan Hajnoczi int ret = 0; 159c2b38b27SPaolo Bonzini 1608c6b0356SStefan Hajnoczi QSLIST_MOVE_ATOMIC(&slice.bh_list, &ctx->bh_list); 1618c6b0356SStefan Hajnoczi QSIMPLEQ_INSERT_TAIL(&ctx->bh_slice_list, &slice, next); 1628c6b0356SStefan Hajnoczi 1638c6b0356SStefan Hajnoczi while ((s = QSIMPLEQ_FIRST(&ctx->bh_slice_list))) { 1648c6b0356SStefan Hajnoczi QEMUBH *bh; 1658c6b0356SStefan Hajnoczi unsigned flags; 1668c6b0356SStefan Hajnoczi 1678c6b0356SStefan Hajnoczi bh = aio_bh_dequeue(&s->bh_list, &flags); 1688c6b0356SStefan Hajnoczi if (!bh) { 1698c6b0356SStefan Hajnoczi QSIMPLEQ_REMOVE_HEAD(&ctx->bh_slice_list, next); 1708c6b0356SStefan Hajnoczi continue; 1718c6b0356SStefan Hajnoczi } 1728c6b0356SStefan Hajnoczi 1738c6b0356SStefan Hajnoczi if ((flags & (BH_SCHEDULED | BH_DELETED)) == BH_SCHEDULED) { 174c2b38b27SPaolo Bonzini /* Idle BHs don't count as progress */ 1758c6b0356SStefan Hajnoczi if (!(flags & BH_IDLE)) { 176c2b38b27SPaolo Bonzini ret = 1; 177c2b38b27SPaolo Bonzini } 178c2b38b27SPaolo Bonzini aio_bh_call(bh); 179c2b38b27SPaolo Bonzini } 1808c6b0356SStefan Hajnoczi if (flags & (BH_DELETED | BH_ONESHOT)) { 181c2b38b27SPaolo Bonzini g_free(bh); 182c2b38b27SPaolo Bonzini } 183c2b38b27SPaolo Bonzini } 1848c6b0356SStefan Hajnoczi 185c2b38b27SPaolo Bonzini return ret; 186c2b38b27SPaolo Bonzini } 187c2b38b27SPaolo Bonzini 188c2b38b27SPaolo Bonzini void qemu_bh_schedule_idle(QEMUBH *bh) 189c2b38b27SPaolo Bonzini { 1908c6b0356SStefan Hajnoczi aio_bh_enqueue(bh, BH_SCHEDULED | BH_IDLE); 191c2b38b27SPaolo Bonzini } 192c2b38b27SPaolo Bonzini 193c2b38b27SPaolo Bonzini void qemu_bh_schedule(QEMUBH *bh) 194c2b38b27SPaolo Bonzini { 1958c6b0356SStefan Hajnoczi aio_bh_enqueue(bh, BH_SCHEDULED); 196c2b38b27SPaolo Bonzini } 197c2b38b27SPaolo Bonzini 198c2b38b27SPaolo Bonzini /* This func is async. 199c2b38b27SPaolo Bonzini */ 200c2b38b27SPaolo Bonzini void qemu_bh_cancel(QEMUBH *bh) 201c2b38b27SPaolo Bonzini { 202d73415a3SStefan Hajnoczi qatomic_and(&bh->flags, ~BH_SCHEDULED); 203c2b38b27SPaolo Bonzini } 204c2b38b27SPaolo Bonzini 205c2b38b27SPaolo Bonzini /* This func is async.The bottom half will do the delete action at the finial 206c2b38b27SPaolo Bonzini * end. 207c2b38b27SPaolo Bonzini */ 208c2b38b27SPaolo Bonzini void qemu_bh_delete(QEMUBH *bh) 209c2b38b27SPaolo Bonzini { 2108c6b0356SStefan Hajnoczi aio_bh_enqueue(bh, BH_DELETED); 211c2b38b27SPaolo Bonzini } 212c2b38b27SPaolo Bonzini 2138c6b0356SStefan Hajnoczi static int64_t aio_compute_bh_timeout(BHList *head, int timeout) 214c2b38b27SPaolo Bonzini { 215c2b38b27SPaolo Bonzini QEMUBH *bh; 216c2b38b27SPaolo Bonzini 2178c6b0356SStefan Hajnoczi QSLIST_FOREACH_RCU(bh, head, next) { 2188c6b0356SStefan Hajnoczi if ((bh->flags & (BH_SCHEDULED | BH_DELETED)) == BH_SCHEDULED) { 2198c6b0356SStefan Hajnoczi if (bh->flags & BH_IDLE) { 220c2b38b27SPaolo Bonzini /* idle bottom halves will be polled at least 221c2b38b27SPaolo Bonzini * every 10ms */ 222c2b38b27SPaolo Bonzini timeout = 10000000; 223c2b38b27SPaolo Bonzini } else { 224c2b38b27SPaolo Bonzini /* non-idle bottom halves will be executed 225c2b38b27SPaolo Bonzini * immediately */ 226c2b38b27SPaolo Bonzini return 0; 227c2b38b27SPaolo Bonzini } 228c2b38b27SPaolo Bonzini } 229c2b38b27SPaolo Bonzini } 230c2b38b27SPaolo Bonzini 2318c6b0356SStefan Hajnoczi return timeout; 2328c6b0356SStefan Hajnoczi } 2338c6b0356SStefan Hajnoczi 2348c6b0356SStefan Hajnoczi int64_t 2358c6b0356SStefan Hajnoczi aio_compute_timeout(AioContext *ctx) 2368c6b0356SStefan Hajnoczi { 2378c6b0356SStefan Hajnoczi BHListSlice *s; 2388c6b0356SStefan Hajnoczi int64_t deadline; 2398c6b0356SStefan Hajnoczi int timeout = -1; 2408c6b0356SStefan Hajnoczi 2418c6b0356SStefan Hajnoczi timeout = aio_compute_bh_timeout(&ctx->bh_list, timeout); 2428c6b0356SStefan Hajnoczi if (timeout == 0) { 2438c6b0356SStefan Hajnoczi return 0; 2448c6b0356SStefan Hajnoczi } 2458c6b0356SStefan Hajnoczi 2468c6b0356SStefan Hajnoczi QSIMPLEQ_FOREACH(s, &ctx->bh_slice_list, next) { 2478c6b0356SStefan Hajnoczi timeout = aio_compute_bh_timeout(&s->bh_list, timeout); 2488c6b0356SStefan Hajnoczi if (timeout == 0) { 2498c6b0356SStefan Hajnoczi return 0; 2508c6b0356SStefan Hajnoczi } 2518c6b0356SStefan Hajnoczi } 2528c6b0356SStefan Hajnoczi 253c2b38b27SPaolo Bonzini deadline = timerlistgroup_deadline_ns(&ctx->tlg); 254c2b38b27SPaolo Bonzini if (deadline == 0) { 255c2b38b27SPaolo Bonzini return 0; 256c2b38b27SPaolo Bonzini } else { 257c2b38b27SPaolo Bonzini return qemu_soonest_timeout(timeout, deadline); 258c2b38b27SPaolo Bonzini } 259c2b38b27SPaolo Bonzini } 260c2b38b27SPaolo Bonzini 261c2b38b27SPaolo Bonzini static gboolean 262c2b38b27SPaolo Bonzini aio_ctx_prepare(GSource *source, gint *timeout) 263c2b38b27SPaolo Bonzini { 264c2b38b27SPaolo Bonzini AioContext *ctx = (AioContext *) source; 265c2b38b27SPaolo Bonzini 266d73415a3SStefan Hajnoczi qatomic_set(&ctx->notify_me, qatomic_read(&ctx->notify_me) | 1); 2675710a3e0SPaolo Bonzini 2685710a3e0SPaolo Bonzini /* 2695710a3e0SPaolo Bonzini * Write ctx->notify_me before computing the timeout 2705710a3e0SPaolo Bonzini * (reading bottom half flags, etc.). Pairs with 2715710a3e0SPaolo Bonzini * smp_mb in aio_notify(). 2725710a3e0SPaolo Bonzini */ 2735710a3e0SPaolo Bonzini smp_mb(); 274c2b38b27SPaolo Bonzini 275c2b38b27SPaolo Bonzini /* We assume there is no timeout already supplied */ 276c2b38b27SPaolo Bonzini *timeout = qemu_timeout_ns_to_ms(aio_compute_timeout(ctx)); 277c2b38b27SPaolo Bonzini 278c2b38b27SPaolo Bonzini if (aio_prepare(ctx)) { 279c2b38b27SPaolo Bonzini *timeout = 0; 280c2b38b27SPaolo Bonzini } 281c2b38b27SPaolo Bonzini 282c2b38b27SPaolo Bonzini return *timeout == 0; 283c2b38b27SPaolo Bonzini } 284c2b38b27SPaolo Bonzini 285c2b38b27SPaolo Bonzini static gboolean 286c2b38b27SPaolo Bonzini aio_ctx_check(GSource *source) 287c2b38b27SPaolo Bonzini { 288c2b38b27SPaolo Bonzini AioContext *ctx = (AioContext *) source; 289c2b38b27SPaolo Bonzini QEMUBH *bh; 2908c6b0356SStefan Hajnoczi BHListSlice *s; 291c2b38b27SPaolo Bonzini 2925710a3e0SPaolo Bonzini /* Finish computing the timeout before clearing the flag. */ 293d73415a3SStefan Hajnoczi qatomic_store_release(&ctx->notify_me, qatomic_read(&ctx->notify_me) & ~1); 294c2b38b27SPaolo Bonzini aio_notify_accept(ctx); 295c2b38b27SPaolo Bonzini 2968c6b0356SStefan Hajnoczi QSLIST_FOREACH_RCU(bh, &ctx->bh_list, next) { 2978c6b0356SStefan Hajnoczi if ((bh->flags & (BH_SCHEDULED | BH_DELETED)) == BH_SCHEDULED) { 298c2b38b27SPaolo Bonzini return true; 299c2b38b27SPaolo Bonzini } 300c2b38b27SPaolo Bonzini } 3018c6b0356SStefan Hajnoczi 3028c6b0356SStefan Hajnoczi QSIMPLEQ_FOREACH(s, &ctx->bh_slice_list, next) { 3038c6b0356SStefan Hajnoczi QSLIST_FOREACH_RCU(bh, &s->bh_list, next) { 3048c6b0356SStefan Hajnoczi if ((bh->flags & (BH_SCHEDULED | BH_DELETED)) == BH_SCHEDULED) { 3058c6b0356SStefan Hajnoczi return true; 3068c6b0356SStefan Hajnoczi } 3078c6b0356SStefan Hajnoczi } 3088c6b0356SStefan Hajnoczi } 309c2b38b27SPaolo Bonzini return aio_pending(ctx) || (timerlistgroup_deadline_ns(&ctx->tlg) == 0); 310c2b38b27SPaolo Bonzini } 311c2b38b27SPaolo Bonzini 312c2b38b27SPaolo Bonzini static gboolean 313c2b38b27SPaolo Bonzini aio_ctx_dispatch(GSource *source, 314c2b38b27SPaolo Bonzini GSourceFunc callback, 315c2b38b27SPaolo Bonzini gpointer user_data) 316c2b38b27SPaolo Bonzini { 317c2b38b27SPaolo Bonzini AioContext *ctx = (AioContext *) source; 318c2b38b27SPaolo Bonzini 319c2b38b27SPaolo Bonzini assert(callback == NULL); 320a153bf52SPaolo Bonzini aio_dispatch(ctx); 321c2b38b27SPaolo Bonzini return true; 322c2b38b27SPaolo Bonzini } 323c2b38b27SPaolo Bonzini 324c2b38b27SPaolo Bonzini static void 325c2b38b27SPaolo Bonzini aio_ctx_finalize(GSource *source) 326c2b38b27SPaolo Bonzini { 327c2b38b27SPaolo Bonzini AioContext *ctx = (AioContext *) source; 3288c6b0356SStefan Hajnoczi QEMUBH *bh; 3298c6b0356SStefan Hajnoczi unsigned flags; 330c2b38b27SPaolo Bonzini 331c2b38b27SPaolo Bonzini thread_pool_free(ctx->thread_pool); 332c2b38b27SPaolo Bonzini 333c2b38b27SPaolo Bonzini #ifdef CONFIG_LINUX_AIO 334c2b38b27SPaolo Bonzini if (ctx->linux_aio) { 335c2b38b27SPaolo Bonzini laio_detach_aio_context(ctx->linux_aio, ctx); 336c2b38b27SPaolo Bonzini laio_cleanup(ctx->linux_aio); 337c2b38b27SPaolo Bonzini ctx->linux_aio = NULL; 338c2b38b27SPaolo Bonzini } 339c2b38b27SPaolo Bonzini #endif 340c2b38b27SPaolo Bonzini 341fcb7a4a4SAarushi Mehta #ifdef CONFIG_LINUX_IO_URING 342fcb7a4a4SAarushi Mehta if (ctx->linux_io_uring) { 343fcb7a4a4SAarushi Mehta luring_detach_aio_context(ctx->linux_io_uring, ctx); 344fcb7a4a4SAarushi Mehta luring_cleanup(ctx->linux_io_uring); 345fcb7a4a4SAarushi Mehta ctx->linux_io_uring = NULL; 346fcb7a4a4SAarushi Mehta } 347fcb7a4a4SAarushi Mehta #endif 348fcb7a4a4SAarushi Mehta 3490c330a73SPaolo Bonzini assert(QSLIST_EMPTY(&ctx->scheduled_coroutines)); 3500c330a73SPaolo Bonzini qemu_bh_delete(ctx->co_schedule_bh); 3510c330a73SPaolo Bonzini 3528c6b0356SStefan Hajnoczi /* There must be no aio_bh_poll() calls going on */ 3538c6b0356SStefan Hajnoczi assert(QSIMPLEQ_EMPTY(&ctx->bh_slice_list)); 354c2b38b27SPaolo Bonzini 3558c6b0356SStefan Hajnoczi while ((bh = aio_bh_dequeue(&ctx->bh_list, &flags))) { 356023ca420SStefan Hajnoczi /* 357023ca420SStefan Hajnoczi * qemu_bh_delete() must have been called on BHs in this AioContext. In 358023ca420SStefan Hajnoczi * many cases memory leaks, hangs, or inconsistent state occur when a 359023ca420SStefan Hajnoczi * BH is leaked because something still expects it to run. 360023ca420SStefan Hajnoczi * 361023ca420SStefan Hajnoczi * If you hit this, fix the lifecycle of the BH so that 362023ca420SStefan Hajnoczi * qemu_bh_delete() and any associated cleanup is called before the 363023ca420SStefan Hajnoczi * AioContext is finalized. 364023ca420SStefan Hajnoczi */ 365023ca420SStefan Hajnoczi if (unlikely(!(flags & BH_DELETED))) { 366023ca420SStefan Hajnoczi fprintf(stderr, "%s: BH '%s' leaked, aborting...\n", 367023ca420SStefan Hajnoczi __func__, bh->name); 368023ca420SStefan Hajnoczi abort(); 369023ca420SStefan Hajnoczi } 370c2b38b27SPaolo Bonzini 3718c6b0356SStefan Hajnoczi g_free(bh); 372c2b38b27SPaolo Bonzini } 373c2b38b27SPaolo Bonzini 374826cc324SStefan Hajnoczi aio_set_event_notifier(ctx, &ctx->notifier, false, NULL, NULL, NULL); 375c2b38b27SPaolo Bonzini event_notifier_cleanup(&ctx->notifier); 376c2b38b27SPaolo Bonzini qemu_rec_mutex_destroy(&ctx->lock); 377c2b38b27SPaolo Bonzini qemu_lockcnt_destroy(&ctx->list_lock); 378c2b38b27SPaolo Bonzini timerlistgroup_deinit(&ctx->tlg); 379cd0a6d2bSJie Wang aio_context_destroy(ctx); 380c2b38b27SPaolo Bonzini } 381c2b38b27SPaolo Bonzini 382c2b38b27SPaolo Bonzini static GSourceFuncs aio_source_funcs = { 383c2b38b27SPaolo Bonzini aio_ctx_prepare, 384c2b38b27SPaolo Bonzini aio_ctx_check, 385c2b38b27SPaolo Bonzini aio_ctx_dispatch, 386c2b38b27SPaolo Bonzini aio_ctx_finalize 387c2b38b27SPaolo Bonzini }; 388c2b38b27SPaolo Bonzini 389c2b38b27SPaolo Bonzini GSource *aio_get_g_source(AioContext *ctx) 390c2b38b27SPaolo Bonzini { 391ba607ca8SStefan Hajnoczi aio_context_use_g_source(ctx); 392c2b38b27SPaolo Bonzini g_source_ref(&ctx->source); 393c2b38b27SPaolo Bonzini return &ctx->source; 394c2b38b27SPaolo Bonzini } 395c2b38b27SPaolo Bonzini 396c2b38b27SPaolo Bonzini ThreadPool *aio_get_thread_pool(AioContext *ctx) 397c2b38b27SPaolo Bonzini { 398c2b38b27SPaolo Bonzini if (!ctx->thread_pool) { 399c2b38b27SPaolo Bonzini ctx->thread_pool = thread_pool_new(ctx); 400c2b38b27SPaolo Bonzini } 401c2b38b27SPaolo Bonzini return ctx->thread_pool; 402c2b38b27SPaolo Bonzini } 403c2b38b27SPaolo Bonzini 404c2b38b27SPaolo Bonzini #ifdef CONFIG_LINUX_AIO 405ed6e2161SNishanth Aravamudan LinuxAioState *aio_setup_linux_aio(AioContext *ctx, Error **errp) 406c2b38b27SPaolo Bonzini { 407c2b38b27SPaolo Bonzini if (!ctx->linux_aio) { 408ed6e2161SNishanth Aravamudan ctx->linux_aio = laio_init(errp); 409ed6e2161SNishanth Aravamudan if (ctx->linux_aio) { 410c2b38b27SPaolo Bonzini laio_attach_aio_context(ctx->linux_aio, ctx); 411c2b38b27SPaolo Bonzini } 412ed6e2161SNishanth Aravamudan } 413ed6e2161SNishanth Aravamudan return ctx->linux_aio; 414ed6e2161SNishanth Aravamudan } 415ed6e2161SNishanth Aravamudan 416ed6e2161SNishanth Aravamudan LinuxAioState *aio_get_linux_aio(AioContext *ctx) 417ed6e2161SNishanth Aravamudan { 418ed6e2161SNishanth Aravamudan assert(ctx->linux_aio); 419c2b38b27SPaolo Bonzini return ctx->linux_aio; 420c2b38b27SPaolo Bonzini } 421c2b38b27SPaolo Bonzini #endif 422c2b38b27SPaolo Bonzini 423fcb7a4a4SAarushi Mehta #ifdef CONFIG_LINUX_IO_URING 424fcb7a4a4SAarushi Mehta LuringState *aio_setup_linux_io_uring(AioContext *ctx, Error **errp) 425fcb7a4a4SAarushi Mehta { 426fcb7a4a4SAarushi Mehta if (ctx->linux_io_uring) { 427fcb7a4a4SAarushi Mehta return ctx->linux_io_uring; 428fcb7a4a4SAarushi Mehta } 429fcb7a4a4SAarushi Mehta 430fcb7a4a4SAarushi Mehta ctx->linux_io_uring = luring_init(errp); 431fcb7a4a4SAarushi Mehta if (!ctx->linux_io_uring) { 432fcb7a4a4SAarushi Mehta return NULL; 433fcb7a4a4SAarushi Mehta } 434fcb7a4a4SAarushi Mehta 435fcb7a4a4SAarushi Mehta luring_attach_aio_context(ctx->linux_io_uring, ctx); 436fcb7a4a4SAarushi Mehta return ctx->linux_io_uring; 437fcb7a4a4SAarushi Mehta } 438fcb7a4a4SAarushi Mehta 439fcb7a4a4SAarushi Mehta LuringState *aio_get_linux_io_uring(AioContext *ctx) 440fcb7a4a4SAarushi Mehta { 441fcb7a4a4SAarushi Mehta assert(ctx->linux_io_uring); 442fcb7a4a4SAarushi Mehta return ctx->linux_io_uring; 443fcb7a4a4SAarushi Mehta } 444fcb7a4a4SAarushi Mehta #endif 445fcb7a4a4SAarushi Mehta 446c2b38b27SPaolo Bonzini void aio_notify(AioContext *ctx) 447c2b38b27SPaolo Bonzini { 448601829f8SStefan Hajnoczi /* 449601829f8SStefan Hajnoczi * Write e.g. bh->flags before writing ctx->notified. Pairs with smp_mb in 450601829f8SStefan Hajnoczi * aio_notify_accept. 451601829f8SStefan Hajnoczi */ 452601829f8SStefan Hajnoczi smp_wmb(); 453d73415a3SStefan Hajnoczi qatomic_set(&ctx->notified, true); 454601829f8SStefan Hajnoczi 455601829f8SStefan Hajnoczi /* 456601829f8SStefan Hajnoczi * Write ctx->notified before reading ctx->notify_me. Pairs 4575710a3e0SPaolo Bonzini * with smp_mb in aio_ctx_prepare or aio_poll. 458c2b38b27SPaolo Bonzini */ 459c2b38b27SPaolo Bonzini smp_mb(); 460d73415a3SStefan Hajnoczi if (qatomic_read(&ctx->notify_me)) { 461c2b38b27SPaolo Bonzini event_notifier_set(&ctx->notifier); 462c2b38b27SPaolo Bonzini } 463c2b38b27SPaolo Bonzini } 464c2b38b27SPaolo Bonzini 465c2b38b27SPaolo Bonzini void aio_notify_accept(AioContext *ctx) 466c2b38b27SPaolo Bonzini { 467d73415a3SStefan Hajnoczi qatomic_set(&ctx->notified, false); 468601829f8SStefan Hajnoczi 469601829f8SStefan Hajnoczi /* 470601829f8SStefan Hajnoczi * Write ctx->notified before reading e.g. bh->flags. Pairs with smp_wmb 471601829f8SStefan Hajnoczi * in aio_notify. 472601829f8SStefan Hajnoczi */ 473601829f8SStefan Hajnoczi smp_mb(); 474c2b38b27SPaolo Bonzini } 475c2b38b27SPaolo Bonzini 4763f53bc61SPaolo Bonzini static void aio_timerlist_notify(void *opaque, QEMUClockType type) 477c2b38b27SPaolo Bonzini { 478c2b38b27SPaolo Bonzini aio_notify(opaque); 479c2b38b27SPaolo Bonzini } 480c2b38b27SPaolo Bonzini 481601829f8SStefan Hajnoczi static void aio_context_notifier_cb(EventNotifier *e) 482c2b38b27SPaolo Bonzini { 483601829f8SStefan Hajnoczi AioContext *ctx = container_of(e, AioContext, notifier); 484601829f8SStefan Hajnoczi 485601829f8SStefan Hajnoczi event_notifier_test_and_clear(&ctx->notifier); 486c2b38b27SPaolo Bonzini } 487c2b38b27SPaolo Bonzini 488c2b38b27SPaolo Bonzini /* Returns true if aio_notify() was called (e.g. a BH was scheduled) */ 489c13be5a1SStefan Hajnoczi static bool aio_context_notifier_poll(void *opaque) 490c2b38b27SPaolo Bonzini { 491c2b38b27SPaolo Bonzini EventNotifier *e = opaque; 492c2b38b27SPaolo Bonzini AioContext *ctx = container_of(e, AioContext, notifier); 493c2b38b27SPaolo Bonzini 494d73415a3SStefan Hajnoczi return qatomic_read(&ctx->notified); 495c2b38b27SPaolo Bonzini } 496c2b38b27SPaolo Bonzini 497826cc324SStefan Hajnoczi static void aio_context_notifier_poll_ready(EventNotifier *e) 498826cc324SStefan Hajnoczi { 499826cc324SStefan Hajnoczi /* Do nothing, we just wanted to kick the event loop */ 500826cc324SStefan Hajnoczi } 501826cc324SStefan Hajnoczi 5020c330a73SPaolo Bonzini static void co_schedule_bh_cb(void *opaque) 5030c330a73SPaolo Bonzini { 5040c330a73SPaolo Bonzini AioContext *ctx = opaque; 5050c330a73SPaolo Bonzini QSLIST_HEAD(, Coroutine) straight, reversed; 5060c330a73SPaolo Bonzini 5070c330a73SPaolo Bonzini QSLIST_MOVE_ATOMIC(&reversed, &ctx->scheduled_coroutines); 5080c330a73SPaolo Bonzini QSLIST_INIT(&straight); 5090c330a73SPaolo Bonzini 5100c330a73SPaolo Bonzini while (!QSLIST_EMPTY(&reversed)) { 5110c330a73SPaolo Bonzini Coroutine *co = QSLIST_FIRST(&reversed); 5120c330a73SPaolo Bonzini QSLIST_REMOVE_HEAD(&reversed, co_scheduled_next); 5130c330a73SPaolo Bonzini QSLIST_INSERT_HEAD(&straight, co, co_scheduled_next); 5140c330a73SPaolo Bonzini } 5150c330a73SPaolo Bonzini 5160c330a73SPaolo Bonzini while (!QSLIST_EMPTY(&straight)) { 5170c330a73SPaolo Bonzini Coroutine *co = QSLIST_FIRST(&straight); 5180c330a73SPaolo Bonzini QSLIST_REMOVE_HEAD(&straight, co_scheduled_next); 5190c330a73SPaolo Bonzini trace_aio_co_schedule_bh_cb(ctx, co); 5201919631eSPaolo Bonzini aio_context_acquire(ctx); 5216133b39fSJeff Cody 5226133b39fSJeff Cody /* Protected by write barrier in qemu_aio_coroutine_enter */ 523d73415a3SStefan Hajnoczi qatomic_set(&co->scheduled, NULL); 5246808ae04SSergio Lopez qemu_aio_coroutine_enter(ctx, co); 5251919631eSPaolo Bonzini aio_context_release(ctx); 5260c330a73SPaolo Bonzini } 5270c330a73SPaolo Bonzini } 5280c330a73SPaolo Bonzini 529c2b38b27SPaolo Bonzini AioContext *aio_context_new(Error **errp) 530c2b38b27SPaolo Bonzini { 531c2b38b27SPaolo Bonzini int ret; 532c2b38b27SPaolo Bonzini AioContext *ctx; 533c2b38b27SPaolo Bonzini 534c2b38b27SPaolo Bonzini ctx = (AioContext *) g_source_new(&aio_source_funcs, sizeof(AioContext)); 5358c6b0356SStefan Hajnoczi QSLIST_INIT(&ctx->bh_list); 5368c6b0356SStefan Hajnoczi QSIMPLEQ_INIT(&ctx->bh_slice_list); 537c2b38b27SPaolo Bonzini aio_context_setup(ctx); 538c2b38b27SPaolo Bonzini 539c2b38b27SPaolo Bonzini ret = event_notifier_init(&ctx->notifier, false); 540c2b38b27SPaolo Bonzini if (ret < 0) { 541c2b38b27SPaolo Bonzini error_setg_errno(errp, -ret, "Failed to initialize event notifier"); 542c2b38b27SPaolo Bonzini goto fail; 543c2b38b27SPaolo Bonzini } 544c2b38b27SPaolo Bonzini g_source_set_can_recurse(&ctx->source, true); 545c2b38b27SPaolo Bonzini qemu_lockcnt_init(&ctx->list_lock); 5460c330a73SPaolo Bonzini 5470c330a73SPaolo Bonzini ctx->co_schedule_bh = aio_bh_new(ctx, co_schedule_bh_cb, ctx); 5480c330a73SPaolo Bonzini QSLIST_INIT(&ctx->scheduled_coroutines); 5490c330a73SPaolo Bonzini 550c2b38b27SPaolo Bonzini aio_set_event_notifier(ctx, &ctx->notifier, 551c2b38b27SPaolo Bonzini false, 552601829f8SStefan Hajnoczi aio_context_notifier_cb, 553826cc324SStefan Hajnoczi aio_context_notifier_poll, 554826cc324SStefan Hajnoczi aio_context_notifier_poll_ready); 555c2b38b27SPaolo Bonzini #ifdef CONFIG_LINUX_AIO 556c2b38b27SPaolo Bonzini ctx->linux_aio = NULL; 557c2b38b27SPaolo Bonzini #endif 558fcb7a4a4SAarushi Mehta 559fcb7a4a4SAarushi Mehta #ifdef CONFIG_LINUX_IO_URING 560fcb7a4a4SAarushi Mehta ctx->linux_io_uring = NULL; 561fcb7a4a4SAarushi Mehta #endif 562fcb7a4a4SAarushi Mehta 563c2b38b27SPaolo Bonzini ctx->thread_pool = NULL; 564c2b38b27SPaolo Bonzini qemu_rec_mutex_init(&ctx->lock); 565c2b38b27SPaolo Bonzini timerlistgroup_init(&ctx->tlg, aio_timerlist_notify, ctx); 566c2b38b27SPaolo Bonzini 567c2b38b27SPaolo Bonzini ctx->poll_ns = 0; 568c2b38b27SPaolo Bonzini ctx->poll_max_ns = 0; 569c2b38b27SPaolo Bonzini ctx->poll_grow = 0; 570c2b38b27SPaolo Bonzini ctx->poll_shrink = 0; 571c2b38b27SPaolo Bonzini 5721793ad02SStefano Garzarella ctx->aio_max_batch = 0; 5731793ad02SStefano Garzarella 57471ad4713SNicolas Saenz Julienne ctx->thread_pool_min = 0; 57571ad4713SNicolas Saenz Julienne ctx->thread_pool_max = THREAD_POOL_MAX_THREADS_DEFAULT; 57671ad4713SNicolas Saenz Julienne 577c2b38b27SPaolo Bonzini return ctx; 578c2b38b27SPaolo Bonzini fail: 579c2b38b27SPaolo Bonzini g_source_destroy(&ctx->source); 580c2b38b27SPaolo Bonzini return NULL; 581c2b38b27SPaolo Bonzini } 582c2b38b27SPaolo Bonzini 5830c330a73SPaolo Bonzini void aio_co_schedule(AioContext *ctx, Coroutine *co) 5840c330a73SPaolo Bonzini { 5850c330a73SPaolo Bonzini trace_aio_co_schedule(ctx, co); 586d73415a3SStefan Hajnoczi const char *scheduled = qatomic_cmpxchg(&co->scheduled, NULL, 5876133b39fSJeff Cody __func__); 5886133b39fSJeff Cody 5896133b39fSJeff Cody if (scheduled) { 5906133b39fSJeff Cody fprintf(stderr, 5916133b39fSJeff Cody "%s: Co-routine was already scheduled in '%s'\n", 5926133b39fSJeff Cody __func__, scheduled); 5936133b39fSJeff Cody abort(); 5946133b39fSJeff Cody } 5956133b39fSJeff Cody 596f0f81002SStefan Hajnoczi /* The coroutine might run and release the last ctx reference before we 597f0f81002SStefan Hajnoczi * invoke qemu_bh_schedule(). Take a reference to keep ctx alive until 598f0f81002SStefan Hajnoczi * we're done. 599f0f81002SStefan Hajnoczi */ 600f0f81002SStefan Hajnoczi aio_context_ref(ctx); 601f0f81002SStefan Hajnoczi 6020c330a73SPaolo Bonzini QSLIST_INSERT_HEAD_ATOMIC(&ctx->scheduled_coroutines, 6030c330a73SPaolo Bonzini co, co_scheduled_next); 6040c330a73SPaolo Bonzini qemu_bh_schedule(ctx->co_schedule_bh); 605f0f81002SStefan Hajnoczi 606f0f81002SStefan Hajnoczi aio_context_unref(ctx); 6070c330a73SPaolo Bonzini } 6080c330a73SPaolo Bonzini 60926b0b698SKevin Wolf typedef struct AioCoRescheduleSelf { 61026b0b698SKevin Wolf Coroutine *co; 61126b0b698SKevin Wolf AioContext *new_ctx; 61226b0b698SKevin Wolf } AioCoRescheduleSelf; 61326b0b698SKevin Wolf 61426b0b698SKevin Wolf static void aio_co_reschedule_self_bh(void *opaque) 61526b0b698SKevin Wolf { 61626b0b698SKevin Wolf AioCoRescheduleSelf *data = opaque; 61726b0b698SKevin Wolf aio_co_schedule(data->new_ctx, data->co); 61826b0b698SKevin Wolf } 61926b0b698SKevin Wolf 62026b0b698SKevin Wolf void coroutine_fn aio_co_reschedule_self(AioContext *new_ctx) 62126b0b698SKevin Wolf { 62226b0b698SKevin Wolf AioContext *old_ctx = qemu_get_current_aio_context(); 62326b0b698SKevin Wolf 62426b0b698SKevin Wolf if (old_ctx != new_ctx) { 62526b0b698SKevin Wolf AioCoRescheduleSelf data = { 62626b0b698SKevin Wolf .co = qemu_coroutine_self(), 62726b0b698SKevin Wolf .new_ctx = new_ctx, 62826b0b698SKevin Wolf }; 62926b0b698SKevin Wolf /* 63026b0b698SKevin Wolf * We can't directly schedule the coroutine in the target context 63126b0b698SKevin Wolf * because this would be racy: The other thread could try to enter the 63226b0b698SKevin Wolf * coroutine before it has yielded in this one. 63326b0b698SKevin Wolf */ 63426b0b698SKevin Wolf aio_bh_schedule_oneshot(old_ctx, aio_co_reschedule_self_bh, &data); 63526b0b698SKevin Wolf qemu_coroutine_yield(); 63626b0b698SKevin Wolf } 63726b0b698SKevin Wolf } 63826b0b698SKevin Wolf 6390c330a73SPaolo Bonzini void aio_co_wake(struct Coroutine *co) 6400c330a73SPaolo Bonzini { 6410c330a73SPaolo Bonzini AioContext *ctx; 6420c330a73SPaolo Bonzini 6430c330a73SPaolo Bonzini /* Read coroutine before co->ctx. Matches smp_wmb in 6440c330a73SPaolo Bonzini * qemu_coroutine_enter. 6450c330a73SPaolo Bonzini */ 6460c330a73SPaolo Bonzini smp_read_barrier_depends(); 647d73415a3SStefan Hajnoczi ctx = qatomic_read(&co->ctx); 6480c330a73SPaolo Bonzini 6498865852eSFam Zheng aio_co_enter(ctx, co); 6508865852eSFam Zheng } 6518865852eSFam Zheng 6528865852eSFam Zheng void aio_co_enter(AioContext *ctx, struct Coroutine *co) 6538865852eSFam Zheng { 6540c330a73SPaolo Bonzini if (ctx != qemu_get_current_aio_context()) { 6550c330a73SPaolo Bonzini aio_co_schedule(ctx, co); 6560c330a73SPaolo Bonzini return; 6570c330a73SPaolo Bonzini } 6580c330a73SPaolo Bonzini 6590c330a73SPaolo Bonzini if (qemu_in_coroutine()) { 6600c330a73SPaolo Bonzini Coroutine *self = qemu_coroutine_self(); 6610c330a73SPaolo Bonzini assert(self != co); 6620c330a73SPaolo Bonzini QSIMPLEQ_INSERT_TAIL(&self->co_queue_wakeup, co, co_queue_next); 6630c330a73SPaolo Bonzini } else { 6640c330a73SPaolo Bonzini aio_context_acquire(ctx); 6658865852eSFam Zheng qemu_aio_coroutine_enter(ctx, co); 6660c330a73SPaolo Bonzini aio_context_release(ctx); 6670c330a73SPaolo Bonzini } 6680c330a73SPaolo Bonzini } 6690c330a73SPaolo Bonzini 670c2b38b27SPaolo Bonzini void aio_context_ref(AioContext *ctx) 671c2b38b27SPaolo Bonzini { 672c2b38b27SPaolo Bonzini g_source_ref(&ctx->source); 673c2b38b27SPaolo Bonzini } 674c2b38b27SPaolo Bonzini 675c2b38b27SPaolo Bonzini void aio_context_unref(AioContext *ctx) 676c2b38b27SPaolo Bonzini { 677c2b38b27SPaolo Bonzini g_source_unref(&ctx->source); 678c2b38b27SPaolo Bonzini } 679c2b38b27SPaolo Bonzini 680c2b38b27SPaolo Bonzini void aio_context_acquire(AioContext *ctx) 681c2b38b27SPaolo Bonzini { 682c2b38b27SPaolo Bonzini qemu_rec_mutex_lock(&ctx->lock); 683c2b38b27SPaolo Bonzini } 684c2b38b27SPaolo Bonzini 685c2b38b27SPaolo Bonzini void aio_context_release(AioContext *ctx) 686c2b38b27SPaolo Bonzini { 687c2b38b27SPaolo Bonzini qemu_rec_mutex_unlock(&ctx->lock); 688c2b38b27SPaolo Bonzini } 6895f50be9bSPaolo Bonzini 69047b74464SStefan Hajnoczi QEMU_DEFINE_STATIC_CO_TLS(AioContext *, my_aiocontext) 6915f50be9bSPaolo Bonzini 6925f50be9bSPaolo Bonzini AioContext *qemu_get_current_aio_context(void) 6935f50be9bSPaolo Bonzini { 69447b74464SStefan Hajnoczi AioContext *ctx = get_my_aiocontext(); 69547b74464SStefan Hajnoczi if (ctx) { 69647b74464SStefan Hajnoczi return ctx; 6975f50be9bSPaolo Bonzini } 6985f50be9bSPaolo Bonzini if (qemu_mutex_iothread_locked()) { 6995f50be9bSPaolo Bonzini /* Possibly in a vCPU thread. */ 7005f50be9bSPaolo Bonzini return qemu_get_aio_context(); 7015f50be9bSPaolo Bonzini } 7025f50be9bSPaolo Bonzini return NULL; 7035f50be9bSPaolo Bonzini } 7045f50be9bSPaolo Bonzini 7055f50be9bSPaolo Bonzini void qemu_set_current_aio_context(AioContext *ctx) 7065f50be9bSPaolo Bonzini { 70747b74464SStefan Hajnoczi assert(!get_my_aiocontext()); 70847b74464SStefan Hajnoczi set_my_aiocontext(ctx); 7095f50be9bSPaolo Bonzini } 71071ad4713SNicolas Saenz Julienne 71171ad4713SNicolas Saenz Julienne void aio_context_set_thread_pool_params(AioContext *ctx, int64_t min, 71271ad4713SNicolas Saenz Julienne int64_t max, Error **errp) 71371ad4713SNicolas Saenz Julienne { 71471ad4713SNicolas Saenz Julienne 71571ad4713SNicolas Saenz Julienne if (min > max || !max || min > INT_MAX || max > INT_MAX) { 71671ad4713SNicolas Saenz Julienne error_setg(errp, "bad thread-pool-min/thread-pool-max values"); 71771ad4713SNicolas Saenz Julienne return; 71871ad4713SNicolas Saenz Julienne } 71971ad4713SNicolas Saenz Julienne 72071ad4713SNicolas Saenz Julienne ctx->thread_pool_min = min; 72171ad4713SNicolas Saenz Julienne ctx->thread_pool_max = max; 72271ad4713SNicolas Saenz Julienne 72371ad4713SNicolas Saenz Julienne if (ctx->thread_pool) { 72471ad4713SNicolas Saenz Julienne thread_pool_update_params(ctx->thread_pool, ctx); 72571ad4713SNicolas Saenz Julienne } 72671ad4713SNicolas Saenz Julienne } 727