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" 30587d82faSEmanuele Giuseppe Esposito #include "block/graph-lock.h" 31c2b38b27SPaolo Bonzini #include "qemu/main-loop.h" 32c2b38b27SPaolo Bonzini #include "qemu/atomic.h" 338c6b0356SStefan Hajnoczi #include "qemu/rcu_queue.h" 34c2b38b27SPaolo Bonzini #include "block/raw-aio.h" 350c330a73SPaolo Bonzini #include "qemu/coroutine_int.h" 3647b74464SStefan Hajnoczi #include "qemu/coroutine-tls.h" 3775bbe5e5SPavel Dovgalyuk #include "sysemu/cpu-timers.h" 380c330a73SPaolo Bonzini #include "trace.h" 39c2b38b27SPaolo Bonzini 40c2b38b27SPaolo Bonzini /***********************************************************/ 41c2b38b27SPaolo Bonzini /* bottom halves (can be seen as timers which expire ASAP) */ 42c2b38b27SPaolo Bonzini 438c6b0356SStefan Hajnoczi /* QEMUBH::flags values */ 448c6b0356SStefan Hajnoczi enum { 458c6b0356SStefan Hajnoczi /* Already enqueued and waiting for aio_bh_poll() */ 468c6b0356SStefan Hajnoczi BH_PENDING = (1 << 0), 478c6b0356SStefan Hajnoczi 488c6b0356SStefan Hajnoczi /* Invoke the callback */ 498c6b0356SStefan Hajnoczi BH_SCHEDULED = (1 << 1), 508c6b0356SStefan Hajnoczi 518c6b0356SStefan Hajnoczi /* Delete without invoking callback */ 528c6b0356SStefan Hajnoczi BH_DELETED = (1 << 2), 538c6b0356SStefan Hajnoczi 548c6b0356SStefan Hajnoczi /* Delete after invoking callback */ 558c6b0356SStefan Hajnoczi BH_ONESHOT = (1 << 3), 568c6b0356SStefan Hajnoczi 578c6b0356SStefan Hajnoczi /* Schedule periodically when the event loop is idle */ 588c6b0356SStefan Hajnoczi BH_IDLE = (1 << 4), 598c6b0356SStefan Hajnoczi }; 608c6b0356SStefan Hajnoczi 61c2b38b27SPaolo Bonzini struct QEMUBH { 62c2b38b27SPaolo Bonzini AioContext *ctx; 630f08586cSStefan Hajnoczi const char *name; 64c2b38b27SPaolo Bonzini QEMUBHFunc *cb; 65c2b38b27SPaolo Bonzini void *opaque; 668c6b0356SStefan Hajnoczi QSLIST_ENTRY(QEMUBH) next; 678c6b0356SStefan Hajnoczi unsigned flags; 68c2b38b27SPaolo Bonzini }; 69c2b38b27SPaolo Bonzini 708c6b0356SStefan Hajnoczi /* Called concurrently from any thread */ 718c6b0356SStefan Hajnoczi static void aio_bh_enqueue(QEMUBH *bh, unsigned new_flags) 728c6b0356SStefan Hajnoczi { 738c6b0356SStefan Hajnoczi AioContext *ctx = bh->ctx; 748c6b0356SStefan Hajnoczi unsigned old_flags; 758c6b0356SStefan Hajnoczi 768c6b0356SStefan Hajnoczi /* 778dd48650SPaolo Bonzini * Synchronizes with atomic_fetch_and() in aio_bh_dequeue(), ensuring that 788dd48650SPaolo Bonzini * insertion starts after BH_PENDING is set. 798dd48650SPaolo Bonzini */ 808dd48650SPaolo Bonzini old_flags = qatomic_fetch_or(&bh->flags, BH_PENDING | new_flags); 818dd48650SPaolo Bonzini 828dd48650SPaolo Bonzini if (!(old_flags & BH_PENDING)) { 838dd48650SPaolo Bonzini /* 848dd48650SPaolo Bonzini * At this point the bottom half becomes visible to aio_bh_poll(). 858dd48650SPaolo Bonzini * This insertion thus synchronizes with QSLIST_MOVE_ATOMIC in 868dd48650SPaolo Bonzini * aio_bh_poll(), ensuring that: 878dd48650SPaolo Bonzini * 1. any writes needed by the callback are visible from the callback 888dd48650SPaolo Bonzini * after aio_bh_dequeue() returns bh. 898c6b0356SStefan Hajnoczi * 2. ctx is loaded before the callback has a chance to execute and bh 908c6b0356SStefan Hajnoczi * could be freed. 918c6b0356SStefan Hajnoczi */ 928c6b0356SStefan Hajnoczi QSLIST_INSERT_HEAD_ATOMIC(&ctx->bh_list, bh, next); 938c6b0356SStefan Hajnoczi } 948c6b0356SStefan Hajnoczi 958c6b0356SStefan Hajnoczi aio_notify(ctx); 9675bbe5e5SPavel Dovgalyuk /* 9775bbe5e5SPavel Dovgalyuk * Workaround for record/replay. 9875bbe5e5SPavel Dovgalyuk * vCPU execution should be suspended when new BH is set. 9975bbe5e5SPavel Dovgalyuk * This is needed to avoid guest timeouts caused 10075bbe5e5SPavel Dovgalyuk * by the long cycles of the execution. 10175bbe5e5SPavel Dovgalyuk */ 10275bbe5e5SPavel Dovgalyuk icount_notify_exit(); 1038c6b0356SStefan Hajnoczi } 1048c6b0356SStefan Hajnoczi 1058c6b0356SStefan Hajnoczi /* Only called from aio_bh_poll() and aio_ctx_finalize() */ 1068c6b0356SStefan Hajnoczi static QEMUBH *aio_bh_dequeue(BHList *head, unsigned *flags) 1078c6b0356SStefan Hajnoczi { 1088c6b0356SStefan Hajnoczi QEMUBH *bh = QSLIST_FIRST_RCU(head); 1098c6b0356SStefan Hajnoczi 1108c6b0356SStefan Hajnoczi if (!bh) { 1118c6b0356SStefan Hajnoczi return NULL; 1128c6b0356SStefan Hajnoczi } 1138c6b0356SStefan Hajnoczi 1148c6b0356SStefan Hajnoczi QSLIST_REMOVE_HEAD(head, next); 1158c6b0356SStefan Hajnoczi 1168c6b0356SStefan Hajnoczi /* 1178dd48650SPaolo Bonzini * Synchronizes with qatomic_fetch_or() in aio_bh_enqueue(), ensuring that 1188dd48650SPaolo Bonzini * the removal finishes before BH_PENDING is reset. 1198c6b0356SStefan Hajnoczi */ 120d73415a3SStefan Hajnoczi *flags = qatomic_fetch_and(&bh->flags, 1218c6b0356SStefan Hajnoczi ~(BH_PENDING | BH_SCHEDULED | BH_IDLE)); 1228c6b0356SStefan Hajnoczi return bh; 1238c6b0356SStefan Hajnoczi } 1248c6b0356SStefan Hajnoczi 1250f08586cSStefan Hajnoczi void aio_bh_schedule_oneshot_full(AioContext *ctx, QEMUBHFunc *cb, 1260f08586cSStefan Hajnoczi void *opaque, const char *name) 127c2b38b27SPaolo Bonzini { 128c2b38b27SPaolo Bonzini QEMUBH *bh; 129c2b38b27SPaolo Bonzini bh = g_new(QEMUBH, 1); 130c2b38b27SPaolo Bonzini *bh = (QEMUBH){ 131c2b38b27SPaolo Bonzini .ctx = ctx, 132c2b38b27SPaolo Bonzini .cb = cb, 133c2b38b27SPaolo Bonzini .opaque = opaque, 1340f08586cSStefan Hajnoczi .name = name, 135c2b38b27SPaolo Bonzini }; 1368c6b0356SStefan Hajnoczi aio_bh_enqueue(bh, BH_SCHEDULED | BH_ONESHOT); 137c2b38b27SPaolo Bonzini } 138c2b38b27SPaolo Bonzini 1390f08586cSStefan Hajnoczi QEMUBH *aio_bh_new_full(AioContext *ctx, QEMUBHFunc *cb, void *opaque, 1400f08586cSStefan Hajnoczi const char *name) 141c2b38b27SPaolo Bonzini { 142c2b38b27SPaolo Bonzini QEMUBH *bh; 143c2b38b27SPaolo Bonzini bh = g_new(QEMUBH, 1); 144c2b38b27SPaolo Bonzini *bh = (QEMUBH){ 145c2b38b27SPaolo Bonzini .ctx = ctx, 146c2b38b27SPaolo Bonzini .cb = cb, 147c2b38b27SPaolo Bonzini .opaque = opaque, 1480f08586cSStefan Hajnoczi .name = name, 149c2b38b27SPaolo Bonzini }; 150c2b38b27SPaolo Bonzini return bh; 151c2b38b27SPaolo Bonzini } 152c2b38b27SPaolo Bonzini 153c2b38b27SPaolo Bonzini void aio_bh_call(QEMUBH *bh) 154c2b38b27SPaolo Bonzini { 155c2b38b27SPaolo Bonzini bh->cb(bh->opaque); 156c2b38b27SPaolo Bonzini } 157c2b38b27SPaolo Bonzini 1588c6b0356SStefan Hajnoczi /* Multiple occurrences of aio_bh_poll cannot be called concurrently. */ 159c2b38b27SPaolo Bonzini int aio_bh_poll(AioContext *ctx) 160c2b38b27SPaolo Bonzini { 1618c6b0356SStefan Hajnoczi BHListSlice slice; 1628c6b0356SStefan Hajnoczi BHListSlice *s; 1638c6b0356SStefan Hajnoczi int ret = 0; 164c2b38b27SPaolo Bonzini 1658dd48650SPaolo Bonzini /* Synchronizes with QSLIST_INSERT_HEAD_ATOMIC in aio_bh_enqueue(). */ 1668c6b0356SStefan Hajnoczi QSLIST_MOVE_ATOMIC(&slice.bh_list, &ctx->bh_list); 1678c6b0356SStefan Hajnoczi QSIMPLEQ_INSERT_TAIL(&ctx->bh_slice_list, &slice, next); 1688c6b0356SStefan Hajnoczi 1698c6b0356SStefan Hajnoczi while ((s = QSIMPLEQ_FIRST(&ctx->bh_slice_list))) { 1708c6b0356SStefan Hajnoczi QEMUBH *bh; 1718c6b0356SStefan Hajnoczi unsigned flags; 1728c6b0356SStefan Hajnoczi 1738c6b0356SStefan Hajnoczi bh = aio_bh_dequeue(&s->bh_list, &flags); 1748c6b0356SStefan Hajnoczi if (!bh) { 1758c6b0356SStefan Hajnoczi QSIMPLEQ_REMOVE_HEAD(&ctx->bh_slice_list, next); 1768c6b0356SStefan Hajnoczi continue; 1778c6b0356SStefan Hajnoczi } 1788c6b0356SStefan Hajnoczi 1798c6b0356SStefan Hajnoczi if ((flags & (BH_SCHEDULED | BH_DELETED)) == BH_SCHEDULED) { 180c2b38b27SPaolo Bonzini /* Idle BHs don't count as progress */ 1818c6b0356SStefan Hajnoczi if (!(flags & BH_IDLE)) { 182c2b38b27SPaolo Bonzini ret = 1; 183c2b38b27SPaolo Bonzini } 184c2b38b27SPaolo Bonzini aio_bh_call(bh); 185c2b38b27SPaolo Bonzini } 1868c6b0356SStefan Hajnoczi if (flags & (BH_DELETED | BH_ONESHOT)) { 187c2b38b27SPaolo Bonzini g_free(bh); 188c2b38b27SPaolo Bonzini } 189c2b38b27SPaolo Bonzini } 1908c6b0356SStefan Hajnoczi 191c2b38b27SPaolo Bonzini return ret; 192c2b38b27SPaolo Bonzini } 193c2b38b27SPaolo Bonzini 194c2b38b27SPaolo Bonzini void qemu_bh_schedule_idle(QEMUBH *bh) 195c2b38b27SPaolo Bonzini { 1968c6b0356SStefan Hajnoczi aio_bh_enqueue(bh, BH_SCHEDULED | BH_IDLE); 197c2b38b27SPaolo Bonzini } 198c2b38b27SPaolo Bonzini 199c2b38b27SPaolo Bonzini void qemu_bh_schedule(QEMUBH *bh) 200c2b38b27SPaolo Bonzini { 2018c6b0356SStefan Hajnoczi aio_bh_enqueue(bh, BH_SCHEDULED); 202c2b38b27SPaolo Bonzini } 203c2b38b27SPaolo Bonzini 204c2b38b27SPaolo Bonzini /* This func is async. 205c2b38b27SPaolo Bonzini */ 206c2b38b27SPaolo Bonzini void qemu_bh_cancel(QEMUBH *bh) 207c2b38b27SPaolo Bonzini { 208d73415a3SStefan Hajnoczi qatomic_and(&bh->flags, ~BH_SCHEDULED); 209c2b38b27SPaolo Bonzini } 210c2b38b27SPaolo Bonzini 211c2b38b27SPaolo Bonzini /* This func is async.The bottom half will do the delete action at the finial 212c2b38b27SPaolo Bonzini * end. 213c2b38b27SPaolo Bonzini */ 214c2b38b27SPaolo Bonzini void qemu_bh_delete(QEMUBH *bh) 215c2b38b27SPaolo Bonzini { 2168c6b0356SStefan Hajnoczi aio_bh_enqueue(bh, BH_DELETED); 217c2b38b27SPaolo Bonzini } 218c2b38b27SPaolo Bonzini 2198c6b0356SStefan Hajnoczi static int64_t aio_compute_bh_timeout(BHList *head, int timeout) 220c2b38b27SPaolo Bonzini { 221c2b38b27SPaolo Bonzini QEMUBH *bh; 222c2b38b27SPaolo Bonzini 2238c6b0356SStefan Hajnoczi QSLIST_FOREACH_RCU(bh, head, next) { 2248c6b0356SStefan Hajnoczi if ((bh->flags & (BH_SCHEDULED | BH_DELETED)) == BH_SCHEDULED) { 2258c6b0356SStefan Hajnoczi if (bh->flags & BH_IDLE) { 226c2b38b27SPaolo Bonzini /* idle bottom halves will be polled at least 227c2b38b27SPaolo Bonzini * every 10ms */ 228c2b38b27SPaolo Bonzini timeout = 10000000; 229c2b38b27SPaolo Bonzini } else { 230c2b38b27SPaolo Bonzini /* non-idle bottom halves will be executed 231c2b38b27SPaolo Bonzini * immediately */ 232c2b38b27SPaolo Bonzini return 0; 233c2b38b27SPaolo Bonzini } 234c2b38b27SPaolo Bonzini } 235c2b38b27SPaolo Bonzini } 236c2b38b27SPaolo Bonzini 2378c6b0356SStefan Hajnoczi return timeout; 2388c6b0356SStefan Hajnoczi } 2398c6b0356SStefan Hajnoczi 2408c6b0356SStefan Hajnoczi int64_t 2418c6b0356SStefan Hajnoczi aio_compute_timeout(AioContext *ctx) 2428c6b0356SStefan Hajnoczi { 2438c6b0356SStefan Hajnoczi BHListSlice *s; 2448c6b0356SStefan Hajnoczi int64_t deadline; 2458c6b0356SStefan Hajnoczi int timeout = -1; 2468c6b0356SStefan Hajnoczi 2478c6b0356SStefan Hajnoczi timeout = aio_compute_bh_timeout(&ctx->bh_list, timeout); 2488c6b0356SStefan Hajnoczi if (timeout == 0) { 2498c6b0356SStefan Hajnoczi return 0; 2508c6b0356SStefan Hajnoczi } 2518c6b0356SStefan Hajnoczi 2528c6b0356SStefan Hajnoczi QSIMPLEQ_FOREACH(s, &ctx->bh_slice_list, next) { 2538c6b0356SStefan Hajnoczi timeout = aio_compute_bh_timeout(&s->bh_list, timeout); 2548c6b0356SStefan Hajnoczi if (timeout == 0) { 2558c6b0356SStefan Hajnoczi return 0; 2568c6b0356SStefan Hajnoczi } 2578c6b0356SStefan Hajnoczi } 2588c6b0356SStefan Hajnoczi 259c2b38b27SPaolo Bonzini deadline = timerlistgroup_deadline_ns(&ctx->tlg); 260c2b38b27SPaolo Bonzini if (deadline == 0) { 261c2b38b27SPaolo Bonzini return 0; 262c2b38b27SPaolo Bonzini } else { 263c2b38b27SPaolo Bonzini return qemu_soonest_timeout(timeout, deadline); 264c2b38b27SPaolo Bonzini } 265c2b38b27SPaolo Bonzini } 266c2b38b27SPaolo Bonzini 267c2b38b27SPaolo Bonzini static gboolean 268c2b38b27SPaolo Bonzini aio_ctx_prepare(GSource *source, gint *timeout) 269c2b38b27SPaolo Bonzini { 270c2b38b27SPaolo Bonzini AioContext *ctx = (AioContext *) source; 271c2b38b27SPaolo Bonzini 272d73415a3SStefan Hajnoczi qatomic_set(&ctx->notify_me, qatomic_read(&ctx->notify_me) | 1); 2735710a3e0SPaolo Bonzini 2745710a3e0SPaolo Bonzini /* 2755710a3e0SPaolo Bonzini * Write ctx->notify_me before computing the timeout 2765710a3e0SPaolo Bonzini * (reading bottom half flags, etc.). Pairs with 2775710a3e0SPaolo Bonzini * smp_mb in aio_notify(). 2785710a3e0SPaolo Bonzini */ 2795710a3e0SPaolo Bonzini smp_mb(); 280c2b38b27SPaolo Bonzini 281c2b38b27SPaolo Bonzini /* We assume there is no timeout already supplied */ 282c2b38b27SPaolo Bonzini *timeout = qemu_timeout_ns_to_ms(aio_compute_timeout(ctx)); 283c2b38b27SPaolo Bonzini 284c2b38b27SPaolo Bonzini if (aio_prepare(ctx)) { 285c2b38b27SPaolo Bonzini *timeout = 0; 286c2b38b27SPaolo Bonzini } 287c2b38b27SPaolo Bonzini 288c2b38b27SPaolo Bonzini return *timeout == 0; 289c2b38b27SPaolo Bonzini } 290c2b38b27SPaolo Bonzini 291c2b38b27SPaolo Bonzini static gboolean 292c2b38b27SPaolo Bonzini aio_ctx_check(GSource *source) 293c2b38b27SPaolo Bonzini { 294c2b38b27SPaolo Bonzini AioContext *ctx = (AioContext *) source; 295c2b38b27SPaolo Bonzini QEMUBH *bh; 2968c6b0356SStefan Hajnoczi BHListSlice *s; 297c2b38b27SPaolo Bonzini 2985710a3e0SPaolo Bonzini /* Finish computing the timeout before clearing the flag. */ 299d73415a3SStefan Hajnoczi qatomic_store_release(&ctx->notify_me, qatomic_read(&ctx->notify_me) & ~1); 300c2b38b27SPaolo Bonzini aio_notify_accept(ctx); 301c2b38b27SPaolo Bonzini 3028c6b0356SStefan Hajnoczi QSLIST_FOREACH_RCU(bh, &ctx->bh_list, next) { 3038c6b0356SStefan Hajnoczi if ((bh->flags & (BH_SCHEDULED | BH_DELETED)) == BH_SCHEDULED) { 304c2b38b27SPaolo Bonzini return true; 305c2b38b27SPaolo Bonzini } 306c2b38b27SPaolo Bonzini } 3078c6b0356SStefan Hajnoczi 3088c6b0356SStefan Hajnoczi QSIMPLEQ_FOREACH(s, &ctx->bh_slice_list, next) { 3098c6b0356SStefan Hajnoczi QSLIST_FOREACH_RCU(bh, &s->bh_list, next) { 3108c6b0356SStefan Hajnoczi if ((bh->flags & (BH_SCHEDULED | BH_DELETED)) == BH_SCHEDULED) { 3118c6b0356SStefan Hajnoczi return true; 3128c6b0356SStefan Hajnoczi } 3138c6b0356SStefan Hajnoczi } 3148c6b0356SStefan Hajnoczi } 315c2b38b27SPaolo Bonzini return aio_pending(ctx) || (timerlistgroup_deadline_ns(&ctx->tlg) == 0); 316c2b38b27SPaolo Bonzini } 317c2b38b27SPaolo Bonzini 318c2b38b27SPaolo Bonzini static gboolean 319c2b38b27SPaolo Bonzini aio_ctx_dispatch(GSource *source, 320c2b38b27SPaolo Bonzini GSourceFunc callback, 321c2b38b27SPaolo Bonzini gpointer user_data) 322c2b38b27SPaolo Bonzini { 323c2b38b27SPaolo Bonzini AioContext *ctx = (AioContext *) source; 324c2b38b27SPaolo Bonzini 325c2b38b27SPaolo Bonzini assert(callback == NULL); 326a153bf52SPaolo Bonzini aio_dispatch(ctx); 327c2b38b27SPaolo Bonzini return true; 328c2b38b27SPaolo Bonzini } 329c2b38b27SPaolo Bonzini 330c2b38b27SPaolo Bonzini static void 331c2b38b27SPaolo Bonzini aio_ctx_finalize(GSource *source) 332c2b38b27SPaolo Bonzini { 333c2b38b27SPaolo Bonzini AioContext *ctx = (AioContext *) source; 3348c6b0356SStefan Hajnoczi QEMUBH *bh; 3358c6b0356SStefan Hajnoczi unsigned flags; 336c2b38b27SPaolo Bonzini 337c2b38b27SPaolo Bonzini thread_pool_free(ctx->thread_pool); 338c2b38b27SPaolo Bonzini 339c2b38b27SPaolo Bonzini #ifdef CONFIG_LINUX_AIO 340c2b38b27SPaolo Bonzini if (ctx->linux_aio) { 341c2b38b27SPaolo Bonzini laio_detach_aio_context(ctx->linux_aio, ctx); 342c2b38b27SPaolo Bonzini laio_cleanup(ctx->linux_aio); 343c2b38b27SPaolo Bonzini ctx->linux_aio = NULL; 344c2b38b27SPaolo Bonzini } 345c2b38b27SPaolo Bonzini #endif 346c2b38b27SPaolo Bonzini 347fcb7a4a4SAarushi Mehta #ifdef CONFIG_LINUX_IO_URING 348fcb7a4a4SAarushi Mehta if (ctx->linux_io_uring) { 349fcb7a4a4SAarushi Mehta luring_detach_aio_context(ctx->linux_io_uring, ctx); 350fcb7a4a4SAarushi Mehta luring_cleanup(ctx->linux_io_uring); 351fcb7a4a4SAarushi Mehta ctx->linux_io_uring = NULL; 352fcb7a4a4SAarushi Mehta } 353fcb7a4a4SAarushi Mehta #endif 354fcb7a4a4SAarushi Mehta 3550c330a73SPaolo Bonzini assert(QSLIST_EMPTY(&ctx->scheduled_coroutines)); 3560c330a73SPaolo Bonzini qemu_bh_delete(ctx->co_schedule_bh); 3570c330a73SPaolo Bonzini 3588c6b0356SStefan Hajnoczi /* There must be no aio_bh_poll() calls going on */ 3598c6b0356SStefan Hajnoczi assert(QSIMPLEQ_EMPTY(&ctx->bh_slice_list)); 360c2b38b27SPaolo Bonzini 3618c6b0356SStefan Hajnoczi while ((bh = aio_bh_dequeue(&ctx->bh_list, &flags))) { 362023ca420SStefan Hajnoczi /* 363023ca420SStefan Hajnoczi * qemu_bh_delete() must have been called on BHs in this AioContext. In 364023ca420SStefan Hajnoczi * many cases memory leaks, hangs, or inconsistent state occur when a 365023ca420SStefan Hajnoczi * BH is leaked because something still expects it to run. 366023ca420SStefan Hajnoczi * 367023ca420SStefan Hajnoczi * If you hit this, fix the lifecycle of the BH so that 368023ca420SStefan Hajnoczi * qemu_bh_delete() and any associated cleanup is called before the 369023ca420SStefan Hajnoczi * AioContext is finalized. 370023ca420SStefan Hajnoczi */ 371023ca420SStefan Hajnoczi if (unlikely(!(flags & BH_DELETED))) { 372023ca420SStefan Hajnoczi fprintf(stderr, "%s: BH '%s' leaked, aborting...\n", 373023ca420SStefan Hajnoczi __func__, bh->name); 374023ca420SStefan Hajnoczi abort(); 375023ca420SStefan Hajnoczi } 376c2b38b27SPaolo Bonzini 3778c6b0356SStefan Hajnoczi g_free(bh); 378c2b38b27SPaolo Bonzini } 379c2b38b27SPaolo Bonzini 380826cc324SStefan Hajnoczi aio_set_event_notifier(ctx, &ctx->notifier, false, NULL, NULL, NULL); 381c2b38b27SPaolo Bonzini event_notifier_cleanup(&ctx->notifier); 382c2b38b27SPaolo Bonzini qemu_rec_mutex_destroy(&ctx->lock); 383c2b38b27SPaolo Bonzini qemu_lockcnt_destroy(&ctx->list_lock); 384c2b38b27SPaolo Bonzini timerlistgroup_deinit(&ctx->tlg); 385587d82faSEmanuele Giuseppe Esposito unregister_aiocontext(ctx); 386cd0a6d2bSJie Wang aio_context_destroy(ctx); 387c2b38b27SPaolo Bonzini } 388c2b38b27SPaolo Bonzini 389c2b38b27SPaolo Bonzini static GSourceFuncs aio_source_funcs = { 390c2b38b27SPaolo Bonzini aio_ctx_prepare, 391c2b38b27SPaolo Bonzini aio_ctx_check, 392c2b38b27SPaolo Bonzini aio_ctx_dispatch, 393c2b38b27SPaolo Bonzini aio_ctx_finalize 394c2b38b27SPaolo Bonzini }; 395c2b38b27SPaolo Bonzini 396c2b38b27SPaolo Bonzini GSource *aio_get_g_source(AioContext *ctx) 397c2b38b27SPaolo Bonzini { 398ba607ca8SStefan Hajnoczi aio_context_use_g_source(ctx); 399c2b38b27SPaolo Bonzini g_source_ref(&ctx->source); 400c2b38b27SPaolo Bonzini return &ctx->source; 401c2b38b27SPaolo Bonzini } 402c2b38b27SPaolo Bonzini 403c2b38b27SPaolo Bonzini ThreadPool *aio_get_thread_pool(AioContext *ctx) 404c2b38b27SPaolo Bonzini { 405c2b38b27SPaolo Bonzini if (!ctx->thread_pool) { 406c2b38b27SPaolo Bonzini ctx->thread_pool = thread_pool_new(ctx); 407c2b38b27SPaolo Bonzini } 408c2b38b27SPaolo Bonzini return ctx->thread_pool; 409c2b38b27SPaolo Bonzini } 410c2b38b27SPaolo Bonzini 411c2b38b27SPaolo Bonzini #ifdef CONFIG_LINUX_AIO 412ed6e2161SNishanth Aravamudan LinuxAioState *aio_setup_linux_aio(AioContext *ctx, Error **errp) 413c2b38b27SPaolo Bonzini { 414c2b38b27SPaolo Bonzini if (!ctx->linux_aio) { 415ed6e2161SNishanth Aravamudan ctx->linux_aio = laio_init(errp); 416ed6e2161SNishanth Aravamudan if (ctx->linux_aio) { 417c2b38b27SPaolo Bonzini laio_attach_aio_context(ctx->linux_aio, ctx); 418c2b38b27SPaolo Bonzini } 419ed6e2161SNishanth Aravamudan } 420ed6e2161SNishanth Aravamudan return ctx->linux_aio; 421ed6e2161SNishanth Aravamudan } 422ed6e2161SNishanth Aravamudan 423ed6e2161SNishanth Aravamudan LinuxAioState *aio_get_linux_aio(AioContext *ctx) 424ed6e2161SNishanth Aravamudan { 425ed6e2161SNishanth Aravamudan assert(ctx->linux_aio); 426c2b38b27SPaolo Bonzini return ctx->linux_aio; 427c2b38b27SPaolo Bonzini } 428c2b38b27SPaolo Bonzini #endif 429c2b38b27SPaolo Bonzini 430fcb7a4a4SAarushi Mehta #ifdef CONFIG_LINUX_IO_URING 431fcb7a4a4SAarushi Mehta LuringState *aio_setup_linux_io_uring(AioContext *ctx, Error **errp) 432fcb7a4a4SAarushi Mehta { 433fcb7a4a4SAarushi Mehta if (ctx->linux_io_uring) { 434fcb7a4a4SAarushi Mehta return ctx->linux_io_uring; 435fcb7a4a4SAarushi Mehta } 436fcb7a4a4SAarushi Mehta 437fcb7a4a4SAarushi Mehta ctx->linux_io_uring = luring_init(errp); 438fcb7a4a4SAarushi Mehta if (!ctx->linux_io_uring) { 439fcb7a4a4SAarushi Mehta return NULL; 440fcb7a4a4SAarushi Mehta } 441fcb7a4a4SAarushi Mehta 442fcb7a4a4SAarushi Mehta luring_attach_aio_context(ctx->linux_io_uring, ctx); 443fcb7a4a4SAarushi Mehta return ctx->linux_io_uring; 444fcb7a4a4SAarushi Mehta } 445fcb7a4a4SAarushi Mehta 446fcb7a4a4SAarushi Mehta LuringState *aio_get_linux_io_uring(AioContext *ctx) 447fcb7a4a4SAarushi Mehta { 448fcb7a4a4SAarushi Mehta assert(ctx->linux_io_uring); 449fcb7a4a4SAarushi Mehta return ctx->linux_io_uring; 450fcb7a4a4SAarushi Mehta } 451fcb7a4a4SAarushi Mehta #endif 452fcb7a4a4SAarushi Mehta 453c2b38b27SPaolo Bonzini void aio_notify(AioContext *ctx) 454c2b38b27SPaolo Bonzini { 455601829f8SStefan Hajnoczi /* 4568dd48650SPaolo Bonzini * Write e.g. ctx->bh_list before writing ctx->notified. Pairs with 4578dd48650SPaolo Bonzini * smp_mb() in aio_notify_accept(). 458601829f8SStefan Hajnoczi */ 459601829f8SStefan Hajnoczi smp_wmb(); 460d73415a3SStefan Hajnoczi qatomic_set(&ctx->notified, true); 461601829f8SStefan Hajnoczi 462601829f8SStefan Hajnoczi /* 4638dd48650SPaolo Bonzini * Write ctx->notified (and also ctx->bh_list) before reading ctx->notify_me. 4648dd48650SPaolo Bonzini * Pairs with smp_mb() in aio_ctx_prepare or aio_poll. 465c2b38b27SPaolo Bonzini */ 466c2b38b27SPaolo Bonzini smp_mb(); 467d73415a3SStefan Hajnoczi if (qatomic_read(&ctx->notify_me)) { 468c2b38b27SPaolo Bonzini event_notifier_set(&ctx->notifier); 469c2b38b27SPaolo Bonzini } 470c2b38b27SPaolo Bonzini } 471c2b38b27SPaolo Bonzini 472c2b38b27SPaolo Bonzini void aio_notify_accept(AioContext *ctx) 473c2b38b27SPaolo Bonzini { 474d73415a3SStefan Hajnoczi qatomic_set(&ctx->notified, false); 475601829f8SStefan Hajnoczi 476601829f8SStefan Hajnoczi /* 477*6229438cSPaolo Bonzini * Order reads of ctx->notified (in aio_context_notifier_poll()) and the 478*6229438cSPaolo Bonzini * above clearing of ctx->notified before reads of e.g. bh->flags. Pairs 479*6229438cSPaolo Bonzini * with smp_wmb() in aio_notify. 480601829f8SStefan Hajnoczi */ 481601829f8SStefan Hajnoczi smp_mb(); 482c2b38b27SPaolo Bonzini } 483c2b38b27SPaolo Bonzini 4843f53bc61SPaolo Bonzini static void aio_timerlist_notify(void *opaque, QEMUClockType type) 485c2b38b27SPaolo Bonzini { 486c2b38b27SPaolo Bonzini aio_notify(opaque); 487c2b38b27SPaolo Bonzini } 488c2b38b27SPaolo Bonzini 489601829f8SStefan Hajnoczi static void aio_context_notifier_cb(EventNotifier *e) 490c2b38b27SPaolo Bonzini { 491601829f8SStefan Hajnoczi AioContext *ctx = container_of(e, AioContext, notifier); 492601829f8SStefan Hajnoczi 493601829f8SStefan Hajnoczi event_notifier_test_and_clear(&ctx->notifier); 494c2b38b27SPaolo Bonzini } 495c2b38b27SPaolo Bonzini 496c2b38b27SPaolo Bonzini /* Returns true if aio_notify() was called (e.g. a BH was scheduled) */ 497c13be5a1SStefan Hajnoczi static bool aio_context_notifier_poll(void *opaque) 498c2b38b27SPaolo Bonzini { 499c2b38b27SPaolo Bonzini EventNotifier *e = opaque; 500c2b38b27SPaolo Bonzini AioContext *ctx = container_of(e, AioContext, notifier); 501c2b38b27SPaolo Bonzini 502*6229438cSPaolo Bonzini /* 503*6229438cSPaolo Bonzini * No need for load-acquire because we just want to kick the 504*6229438cSPaolo Bonzini * event loop. aio_notify_accept() takes care of synchronizing 505*6229438cSPaolo Bonzini * the event loop with the producers. 506*6229438cSPaolo Bonzini */ 507d73415a3SStefan Hajnoczi return qatomic_read(&ctx->notified); 508c2b38b27SPaolo Bonzini } 509c2b38b27SPaolo Bonzini 510826cc324SStefan Hajnoczi static void aio_context_notifier_poll_ready(EventNotifier *e) 511826cc324SStefan Hajnoczi { 512826cc324SStefan Hajnoczi /* Do nothing, we just wanted to kick the event loop */ 513826cc324SStefan Hajnoczi } 514826cc324SStefan Hajnoczi 5150c330a73SPaolo Bonzini static void co_schedule_bh_cb(void *opaque) 5160c330a73SPaolo Bonzini { 5170c330a73SPaolo Bonzini AioContext *ctx = opaque; 5180c330a73SPaolo Bonzini QSLIST_HEAD(, Coroutine) straight, reversed; 5190c330a73SPaolo Bonzini 5200c330a73SPaolo Bonzini QSLIST_MOVE_ATOMIC(&reversed, &ctx->scheduled_coroutines); 5210c330a73SPaolo Bonzini QSLIST_INIT(&straight); 5220c330a73SPaolo Bonzini 5230c330a73SPaolo Bonzini while (!QSLIST_EMPTY(&reversed)) { 5240c330a73SPaolo Bonzini Coroutine *co = QSLIST_FIRST(&reversed); 5250c330a73SPaolo Bonzini QSLIST_REMOVE_HEAD(&reversed, co_scheduled_next); 5260c330a73SPaolo Bonzini QSLIST_INSERT_HEAD(&straight, co, co_scheduled_next); 5270c330a73SPaolo Bonzini } 5280c330a73SPaolo Bonzini 5290c330a73SPaolo Bonzini while (!QSLIST_EMPTY(&straight)) { 5300c330a73SPaolo Bonzini Coroutine *co = QSLIST_FIRST(&straight); 5310c330a73SPaolo Bonzini QSLIST_REMOVE_HEAD(&straight, co_scheduled_next); 5320c330a73SPaolo Bonzini trace_aio_co_schedule_bh_cb(ctx, co); 5331919631eSPaolo Bonzini aio_context_acquire(ctx); 5346133b39fSJeff Cody 5356133b39fSJeff Cody /* Protected by write barrier in qemu_aio_coroutine_enter */ 536d73415a3SStefan Hajnoczi qatomic_set(&co->scheduled, NULL); 5376808ae04SSergio Lopez qemu_aio_coroutine_enter(ctx, co); 5381919631eSPaolo Bonzini aio_context_release(ctx); 5390c330a73SPaolo Bonzini } 5400c330a73SPaolo Bonzini } 5410c330a73SPaolo Bonzini 542c2b38b27SPaolo Bonzini AioContext *aio_context_new(Error **errp) 543c2b38b27SPaolo Bonzini { 544c2b38b27SPaolo Bonzini int ret; 545c2b38b27SPaolo Bonzini AioContext *ctx; 546c2b38b27SPaolo Bonzini 547c2b38b27SPaolo Bonzini ctx = (AioContext *) g_source_new(&aio_source_funcs, sizeof(AioContext)); 5488c6b0356SStefan Hajnoczi QSLIST_INIT(&ctx->bh_list); 5498c6b0356SStefan Hajnoczi QSIMPLEQ_INIT(&ctx->bh_slice_list); 550c2b38b27SPaolo Bonzini aio_context_setup(ctx); 551c2b38b27SPaolo Bonzini 552c2b38b27SPaolo Bonzini ret = event_notifier_init(&ctx->notifier, false); 553c2b38b27SPaolo Bonzini if (ret < 0) { 554c2b38b27SPaolo Bonzini error_setg_errno(errp, -ret, "Failed to initialize event notifier"); 555c2b38b27SPaolo Bonzini goto fail; 556c2b38b27SPaolo Bonzini } 557c2b38b27SPaolo Bonzini g_source_set_can_recurse(&ctx->source, true); 558c2b38b27SPaolo Bonzini qemu_lockcnt_init(&ctx->list_lock); 5590c330a73SPaolo Bonzini 5600c330a73SPaolo Bonzini ctx->co_schedule_bh = aio_bh_new(ctx, co_schedule_bh_cb, ctx); 5610c330a73SPaolo Bonzini QSLIST_INIT(&ctx->scheduled_coroutines); 5620c330a73SPaolo Bonzini 563c2b38b27SPaolo Bonzini aio_set_event_notifier(ctx, &ctx->notifier, 564c2b38b27SPaolo Bonzini false, 565601829f8SStefan Hajnoczi aio_context_notifier_cb, 566826cc324SStefan Hajnoczi aio_context_notifier_poll, 567826cc324SStefan Hajnoczi aio_context_notifier_poll_ready); 568c2b38b27SPaolo Bonzini #ifdef CONFIG_LINUX_AIO 569c2b38b27SPaolo Bonzini ctx->linux_aio = NULL; 570c2b38b27SPaolo Bonzini #endif 571fcb7a4a4SAarushi Mehta 572fcb7a4a4SAarushi Mehta #ifdef CONFIG_LINUX_IO_URING 573fcb7a4a4SAarushi Mehta ctx->linux_io_uring = NULL; 574fcb7a4a4SAarushi Mehta #endif 575fcb7a4a4SAarushi Mehta 576c2b38b27SPaolo Bonzini ctx->thread_pool = NULL; 577c2b38b27SPaolo Bonzini qemu_rec_mutex_init(&ctx->lock); 578c2b38b27SPaolo Bonzini timerlistgroup_init(&ctx->tlg, aio_timerlist_notify, ctx); 579c2b38b27SPaolo Bonzini 580c2b38b27SPaolo Bonzini ctx->poll_ns = 0; 581c2b38b27SPaolo Bonzini ctx->poll_max_ns = 0; 582c2b38b27SPaolo Bonzini ctx->poll_grow = 0; 583c2b38b27SPaolo Bonzini ctx->poll_shrink = 0; 584c2b38b27SPaolo Bonzini 5851793ad02SStefano Garzarella ctx->aio_max_batch = 0; 5861793ad02SStefano Garzarella 58771ad4713SNicolas Saenz Julienne ctx->thread_pool_min = 0; 58871ad4713SNicolas Saenz Julienne ctx->thread_pool_max = THREAD_POOL_MAX_THREADS_DEFAULT; 58971ad4713SNicolas Saenz Julienne 590587d82faSEmanuele Giuseppe Esposito register_aiocontext(ctx); 591587d82faSEmanuele Giuseppe Esposito 592c2b38b27SPaolo Bonzini return ctx; 593c2b38b27SPaolo Bonzini fail: 594c2b38b27SPaolo Bonzini g_source_destroy(&ctx->source); 595c2b38b27SPaolo Bonzini return NULL; 596c2b38b27SPaolo Bonzini } 597c2b38b27SPaolo Bonzini 5980c330a73SPaolo Bonzini void aio_co_schedule(AioContext *ctx, Coroutine *co) 5990c330a73SPaolo Bonzini { 6000c330a73SPaolo Bonzini trace_aio_co_schedule(ctx, co); 601d73415a3SStefan Hajnoczi const char *scheduled = qatomic_cmpxchg(&co->scheduled, NULL, 6026133b39fSJeff Cody __func__); 6036133b39fSJeff Cody 6046133b39fSJeff Cody if (scheduled) { 6056133b39fSJeff Cody fprintf(stderr, 6066133b39fSJeff Cody "%s: Co-routine was already scheduled in '%s'\n", 6076133b39fSJeff Cody __func__, scheduled); 6086133b39fSJeff Cody abort(); 6096133b39fSJeff Cody } 6106133b39fSJeff Cody 611f0f81002SStefan Hajnoczi /* The coroutine might run and release the last ctx reference before we 612f0f81002SStefan Hajnoczi * invoke qemu_bh_schedule(). Take a reference to keep ctx alive until 613f0f81002SStefan Hajnoczi * we're done. 614f0f81002SStefan Hajnoczi */ 615f0f81002SStefan Hajnoczi aio_context_ref(ctx); 616f0f81002SStefan Hajnoczi 6170c330a73SPaolo Bonzini QSLIST_INSERT_HEAD_ATOMIC(&ctx->scheduled_coroutines, 6180c330a73SPaolo Bonzini co, co_scheduled_next); 6190c330a73SPaolo Bonzini qemu_bh_schedule(ctx->co_schedule_bh); 620f0f81002SStefan Hajnoczi 621f0f81002SStefan Hajnoczi aio_context_unref(ctx); 6220c330a73SPaolo Bonzini } 6230c330a73SPaolo Bonzini 62426b0b698SKevin Wolf typedef struct AioCoRescheduleSelf { 62526b0b698SKevin Wolf Coroutine *co; 62626b0b698SKevin Wolf AioContext *new_ctx; 62726b0b698SKevin Wolf } AioCoRescheduleSelf; 62826b0b698SKevin Wolf 62926b0b698SKevin Wolf static void aio_co_reschedule_self_bh(void *opaque) 63026b0b698SKevin Wolf { 63126b0b698SKevin Wolf AioCoRescheduleSelf *data = opaque; 63226b0b698SKevin Wolf aio_co_schedule(data->new_ctx, data->co); 63326b0b698SKevin Wolf } 63426b0b698SKevin Wolf 63526b0b698SKevin Wolf void coroutine_fn aio_co_reschedule_self(AioContext *new_ctx) 63626b0b698SKevin Wolf { 63726b0b698SKevin Wolf AioContext *old_ctx = qemu_get_current_aio_context(); 63826b0b698SKevin Wolf 63926b0b698SKevin Wolf if (old_ctx != new_ctx) { 64026b0b698SKevin Wolf AioCoRescheduleSelf data = { 64126b0b698SKevin Wolf .co = qemu_coroutine_self(), 64226b0b698SKevin Wolf .new_ctx = new_ctx, 64326b0b698SKevin Wolf }; 64426b0b698SKevin Wolf /* 64526b0b698SKevin Wolf * We can't directly schedule the coroutine in the target context 64626b0b698SKevin Wolf * because this would be racy: The other thread could try to enter the 64726b0b698SKevin Wolf * coroutine before it has yielded in this one. 64826b0b698SKevin Wolf */ 64926b0b698SKevin Wolf aio_bh_schedule_oneshot(old_ctx, aio_co_reschedule_self_bh, &data); 65026b0b698SKevin Wolf qemu_coroutine_yield(); 65126b0b698SKevin Wolf } 65226b0b698SKevin Wolf } 65326b0b698SKevin Wolf 65443695601SMarkus Armbruster void aio_co_wake(Coroutine *co) 6550c330a73SPaolo Bonzini { 6560c330a73SPaolo Bonzini AioContext *ctx; 6570c330a73SPaolo Bonzini 6580c330a73SPaolo Bonzini /* Read coroutine before co->ctx. Matches smp_wmb in 6590c330a73SPaolo Bonzini * qemu_coroutine_enter. 6600c330a73SPaolo Bonzini */ 6610c330a73SPaolo Bonzini smp_read_barrier_depends(); 662d73415a3SStefan Hajnoczi ctx = qatomic_read(&co->ctx); 6630c330a73SPaolo Bonzini 6648865852eSFam Zheng aio_co_enter(ctx, co); 6658865852eSFam Zheng } 6668865852eSFam Zheng 66743695601SMarkus Armbruster void aio_co_enter(AioContext *ctx, Coroutine *co) 6688865852eSFam Zheng { 6690c330a73SPaolo Bonzini if (ctx != qemu_get_current_aio_context()) { 6700c330a73SPaolo Bonzini aio_co_schedule(ctx, co); 6710c330a73SPaolo Bonzini return; 6720c330a73SPaolo Bonzini } 6730c330a73SPaolo Bonzini 6740c330a73SPaolo Bonzini if (qemu_in_coroutine()) { 6750c330a73SPaolo Bonzini Coroutine *self = qemu_coroutine_self(); 6760c330a73SPaolo Bonzini assert(self != co); 6770c330a73SPaolo Bonzini QSIMPLEQ_INSERT_TAIL(&self->co_queue_wakeup, co, co_queue_next); 6780c330a73SPaolo Bonzini } else { 6790c330a73SPaolo Bonzini aio_context_acquire(ctx); 6808865852eSFam Zheng qemu_aio_coroutine_enter(ctx, co); 6810c330a73SPaolo Bonzini aio_context_release(ctx); 6820c330a73SPaolo Bonzini } 6830c330a73SPaolo Bonzini } 6840c330a73SPaolo Bonzini 685c2b38b27SPaolo Bonzini void aio_context_ref(AioContext *ctx) 686c2b38b27SPaolo Bonzini { 687c2b38b27SPaolo Bonzini g_source_ref(&ctx->source); 688c2b38b27SPaolo Bonzini } 689c2b38b27SPaolo Bonzini 690c2b38b27SPaolo Bonzini void aio_context_unref(AioContext *ctx) 691c2b38b27SPaolo Bonzini { 692c2b38b27SPaolo Bonzini g_source_unref(&ctx->source); 693c2b38b27SPaolo Bonzini } 694c2b38b27SPaolo Bonzini 695c2b38b27SPaolo Bonzini void aio_context_acquire(AioContext *ctx) 696c2b38b27SPaolo Bonzini { 697c2b38b27SPaolo Bonzini qemu_rec_mutex_lock(&ctx->lock); 698c2b38b27SPaolo Bonzini } 699c2b38b27SPaolo Bonzini 700c2b38b27SPaolo Bonzini void aio_context_release(AioContext *ctx) 701c2b38b27SPaolo Bonzini { 702c2b38b27SPaolo Bonzini qemu_rec_mutex_unlock(&ctx->lock); 703c2b38b27SPaolo Bonzini } 7045f50be9bSPaolo Bonzini 70547b74464SStefan Hajnoczi QEMU_DEFINE_STATIC_CO_TLS(AioContext *, my_aiocontext) 7065f50be9bSPaolo Bonzini 7075f50be9bSPaolo Bonzini AioContext *qemu_get_current_aio_context(void) 7085f50be9bSPaolo Bonzini { 70947b74464SStefan Hajnoczi AioContext *ctx = get_my_aiocontext(); 71047b74464SStefan Hajnoczi if (ctx) { 71147b74464SStefan Hajnoczi return ctx; 7125f50be9bSPaolo Bonzini } 7135f50be9bSPaolo Bonzini if (qemu_mutex_iothread_locked()) { 7145f50be9bSPaolo Bonzini /* Possibly in a vCPU thread. */ 7155f50be9bSPaolo Bonzini return qemu_get_aio_context(); 7165f50be9bSPaolo Bonzini } 7175f50be9bSPaolo Bonzini return NULL; 7185f50be9bSPaolo Bonzini } 7195f50be9bSPaolo Bonzini 7205f50be9bSPaolo Bonzini void qemu_set_current_aio_context(AioContext *ctx) 7215f50be9bSPaolo Bonzini { 72247b74464SStefan Hajnoczi assert(!get_my_aiocontext()); 72347b74464SStefan Hajnoczi set_my_aiocontext(ctx); 7245f50be9bSPaolo Bonzini } 72571ad4713SNicolas Saenz Julienne 72671ad4713SNicolas Saenz Julienne void aio_context_set_thread_pool_params(AioContext *ctx, int64_t min, 72771ad4713SNicolas Saenz Julienne int64_t max, Error **errp) 72871ad4713SNicolas Saenz Julienne { 72971ad4713SNicolas Saenz Julienne 73071ad4713SNicolas Saenz Julienne if (min > max || !max || min > INT_MAX || max > INT_MAX) { 73171ad4713SNicolas Saenz Julienne error_setg(errp, "bad thread-pool-min/thread-pool-max values"); 73271ad4713SNicolas Saenz Julienne return; 73371ad4713SNicolas Saenz Julienne } 73471ad4713SNicolas Saenz Julienne 73571ad4713SNicolas Saenz Julienne ctx->thread_pool_min = min; 73671ad4713SNicolas Saenz Julienne ctx->thread_pool_max = max; 73771ad4713SNicolas Saenz Julienne 73871ad4713SNicolas Saenz Julienne if (ctx->thread_pool) { 73971ad4713SNicolas Saenz Julienne thread_pool_update_params(ctx->thread_pool, ctx); 74071ad4713SNicolas Saenz Julienne } 74171ad4713SNicolas Saenz Julienne } 742