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" 30*587d82faSEmanuele 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 /* 77d73415a3SStefan Hajnoczi * The memory barrier implicit in qatomic_fetch_or makes sure that: 788c6b0356SStefan Hajnoczi * 1. idle & any writes needed by the callback are done before the 798c6b0356SStefan Hajnoczi * locations are read in the aio_bh_poll. 808c6b0356SStefan Hajnoczi * 2. ctx is loaded before the callback has a chance to execute and bh 818c6b0356SStefan Hajnoczi * could be freed. 828c6b0356SStefan Hajnoczi */ 83d73415a3SStefan Hajnoczi old_flags = qatomic_fetch_or(&bh->flags, BH_PENDING | new_flags); 848c6b0356SStefan Hajnoczi if (!(old_flags & BH_PENDING)) { 858c6b0356SStefan Hajnoczi QSLIST_INSERT_HEAD_ATOMIC(&ctx->bh_list, bh, next); 868c6b0356SStefan Hajnoczi } 878c6b0356SStefan Hajnoczi 888c6b0356SStefan Hajnoczi aio_notify(ctx); 8975bbe5e5SPavel Dovgalyuk /* 9075bbe5e5SPavel Dovgalyuk * Workaround for record/replay. 9175bbe5e5SPavel Dovgalyuk * vCPU execution should be suspended when new BH is set. 9275bbe5e5SPavel Dovgalyuk * This is needed to avoid guest timeouts caused 9375bbe5e5SPavel Dovgalyuk * by the long cycles of the execution. 9475bbe5e5SPavel Dovgalyuk */ 9575bbe5e5SPavel Dovgalyuk icount_notify_exit(); 968c6b0356SStefan Hajnoczi } 978c6b0356SStefan Hajnoczi 988c6b0356SStefan Hajnoczi /* Only called from aio_bh_poll() and aio_ctx_finalize() */ 998c6b0356SStefan Hajnoczi static QEMUBH *aio_bh_dequeue(BHList *head, unsigned *flags) 1008c6b0356SStefan Hajnoczi { 1018c6b0356SStefan Hajnoczi QEMUBH *bh = QSLIST_FIRST_RCU(head); 1028c6b0356SStefan Hajnoczi 1038c6b0356SStefan Hajnoczi if (!bh) { 1048c6b0356SStefan Hajnoczi return NULL; 1058c6b0356SStefan Hajnoczi } 1068c6b0356SStefan Hajnoczi 1078c6b0356SStefan Hajnoczi QSLIST_REMOVE_HEAD(head, next); 1088c6b0356SStefan Hajnoczi 1098c6b0356SStefan Hajnoczi /* 110d73415a3SStefan Hajnoczi * The qatomic_and is paired with aio_bh_enqueue(). The implicit memory 1118c6b0356SStefan Hajnoczi * barrier ensures that the callback sees all writes done by the scheduling 1128c6b0356SStefan Hajnoczi * thread. It also ensures that the scheduling thread sees the cleared 1138c6b0356SStefan Hajnoczi * flag before bh->cb has run, and thus will call aio_notify again if 1148c6b0356SStefan Hajnoczi * necessary. 1158c6b0356SStefan Hajnoczi */ 116d73415a3SStefan Hajnoczi *flags = qatomic_fetch_and(&bh->flags, 1178c6b0356SStefan Hajnoczi ~(BH_PENDING | BH_SCHEDULED | BH_IDLE)); 1188c6b0356SStefan Hajnoczi return bh; 1198c6b0356SStefan Hajnoczi } 1208c6b0356SStefan Hajnoczi 1210f08586cSStefan Hajnoczi void aio_bh_schedule_oneshot_full(AioContext *ctx, QEMUBHFunc *cb, 1220f08586cSStefan Hajnoczi void *opaque, const char *name) 123c2b38b27SPaolo Bonzini { 124c2b38b27SPaolo Bonzini QEMUBH *bh; 125c2b38b27SPaolo Bonzini bh = g_new(QEMUBH, 1); 126c2b38b27SPaolo Bonzini *bh = (QEMUBH){ 127c2b38b27SPaolo Bonzini .ctx = ctx, 128c2b38b27SPaolo Bonzini .cb = cb, 129c2b38b27SPaolo Bonzini .opaque = opaque, 1300f08586cSStefan Hajnoczi .name = name, 131c2b38b27SPaolo Bonzini }; 1328c6b0356SStefan Hajnoczi aio_bh_enqueue(bh, BH_SCHEDULED | BH_ONESHOT); 133c2b38b27SPaolo Bonzini } 134c2b38b27SPaolo Bonzini 1350f08586cSStefan Hajnoczi QEMUBH *aio_bh_new_full(AioContext *ctx, QEMUBHFunc *cb, void *opaque, 1360f08586cSStefan Hajnoczi const char *name) 137c2b38b27SPaolo Bonzini { 138c2b38b27SPaolo Bonzini QEMUBH *bh; 139c2b38b27SPaolo Bonzini bh = g_new(QEMUBH, 1); 140c2b38b27SPaolo Bonzini *bh = (QEMUBH){ 141c2b38b27SPaolo Bonzini .ctx = ctx, 142c2b38b27SPaolo Bonzini .cb = cb, 143c2b38b27SPaolo Bonzini .opaque = opaque, 1440f08586cSStefan Hajnoczi .name = name, 145c2b38b27SPaolo Bonzini }; 146c2b38b27SPaolo Bonzini return bh; 147c2b38b27SPaolo Bonzini } 148c2b38b27SPaolo Bonzini 149c2b38b27SPaolo Bonzini void aio_bh_call(QEMUBH *bh) 150c2b38b27SPaolo Bonzini { 151c2b38b27SPaolo Bonzini bh->cb(bh->opaque); 152c2b38b27SPaolo Bonzini } 153c2b38b27SPaolo Bonzini 1548c6b0356SStefan Hajnoczi /* Multiple occurrences of aio_bh_poll cannot be called concurrently. */ 155c2b38b27SPaolo Bonzini int aio_bh_poll(AioContext *ctx) 156c2b38b27SPaolo Bonzini { 1578c6b0356SStefan Hajnoczi BHListSlice slice; 1588c6b0356SStefan Hajnoczi BHListSlice *s; 1598c6b0356SStefan Hajnoczi int ret = 0; 160c2b38b27SPaolo Bonzini 1618c6b0356SStefan Hajnoczi QSLIST_MOVE_ATOMIC(&slice.bh_list, &ctx->bh_list); 1628c6b0356SStefan Hajnoczi QSIMPLEQ_INSERT_TAIL(&ctx->bh_slice_list, &slice, next); 1638c6b0356SStefan Hajnoczi 1648c6b0356SStefan Hajnoczi while ((s = QSIMPLEQ_FIRST(&ctx->bh_slice_list))) { 1658c6b0356SStefan Hajnoczi QEMUBH *bh; 1668c6b0356SStefan Hajnoczi unsigned flags; 1678c6b0356SStefan Hajnoczi 1688c6b0356SStefan Hajnoczi bh = aio_bh_dequeue(&s->bh_list, &flags); 1698c6b0356SStefan Hajnoczi if (!bh) { 1708c6b0356SStefan Hajnoczi QSIMPLEQ_REMOVE_HEAD(&ctx->bh_slice_list, next); 1718c6b0356SStefan Hajnoczi continue; 1728c6b0356SStefan Hajnoczi } 1738c6b0356SStefan Hajnoczi 1748c6b0356SStefan Hajnoczi if ((flags & (BH_SCHEDULED | BH_DELETED)) == BH_SCHEDULED) { 175c2b38b27SPaolo Bonzini /* Idle BHs don't count as progress */ 1768c6b0356SStefan Hajnoczi if (!(flags & BH_IDLE)) { 177c2b38b27SPaolo Bonzini ret = 1; 178c2b38b27SPaolo Bonzini } 179c2b38b27SPaolo Bonzini aio_bh_call(bh); 180c2b38b27SPaolo Bonzini } 1818c6b0356SStefan Hajnoczi if (flags & (BH_DELETED | BH_ONESHOT)) { 182c2b38b27SPaolo Bonzini g_free(bh); 183c2b38b27SPaolo Bonzini } 184c2b38b27SPaolo Bonzini } 1858c6b0356SStefan Hajnoczi 186c2b38b27SPaolo Bonzini return ret; 187c2b38b27SPaolo Bonzini } 188c2b38b27SPaolo Bonzini 189c2b38b27SPaolo Bonzini void qemu_bh_schedule_idle(QEMUBH *bh) 190c2b38b27SPaolo Bonzini { 1918c6b0356SStefan Hajnoczi aio_bh_enqueue(bh, BH_SCHEDULED | BH_IDLE); 192c2b38b27SPaolo Bonzini } 193c2b38b27SPaolo Bonzini 194c2b38b27SPaolo Bonzini void qemu_bh_schedule(QEMUBH *bh) 195c2b38b27SPaolo Bonzini { 1968c6b0356SStefan Hajnoczi aio_bh_enqueue(bh, BH_SCHEDULED); 197c2b38b27SPaolo Bonzini } 198c2b38b27SPaolo Bonzini 199c2b38b27SPaolo Bonzini /* This func is async. 200c2b38b27SPaolo Bonzini */ 201c2b38b27SPaolo Bonzini void qemu_bh_cancel(QEMUBH *bh) 202c2b38b27SPaolo Bonzini { 203d73415a3SStefan Hajnoczi qatomic_and(&bh->flags, ~BH_SCHEDULED); 204c2b38b27SPaolo Bonzini } 205c2b38b27SPaolo Bonzini 206c2b38b27SPaolo Bonzini /* This func is async.The bottom half will do the delete action at the finial 207c2b38b27SPaolo Bonzini * end. 208c2b38b27SPaolo Bonzini */ 209c2b38b27SPaolo Bonzini void qemu_bh_delete(QEMUBH *bh) 210c2b38b27SPaolo Bonzini { 2118c6b0356SStefan Hajnoczi aio_bh_enqueue(bh, BH_DELETED); 212c2b38b27SPaolo Bonzini } 213c2b38b27SPaolo Bonzini 2148c6b0356SStefan Hajnoczi static int64_t aio_compute_bh_timeout(BHList *head, int timeout) 215c2b38b27SPaolo Bonzini { 216c2b38b27SPaolo Bonzini QEMUBH *bh; 217c2b38b27SPaolo Bonzini 2188c6b0356SStefan Hajnoczi QSLIST_FOREACH_RCU(bh, head, next) { 2198c6b0356SStefan Hajnoczi if ((bh->flags & (BH_SCHEDULED | BH_DELETED)) == BH_SCHEDULED) { 2208c6b0356SStefan Hajnoczi if (bh->flags & BH_IDLE) { 221c2b38b27SPaolo Bonzini /* idle bottom halves will be polled at least 222c2b38b27SPaolo Bonzini * every 10ms */ 223c2b38b27SPaolo Bonzini timeout = 10000000; 224c2b38b27SPaolo Bonzini } else { 225c2b38b27SPaolo Bonzini /* non-idle bottom halves will be executed 226c2b38b27SPaolo Bonzini * immediately */ 227c2b38b27SPaolo Bonzini return 0; 228c2b38b27SPaolo Bonzini } 229c2b38b27SPaolo Bonzini } 230c2b38b27SPaolo Bonzini } 231c2b38b27SPaolo Bonzini 2328c6b0356SStefan Hajnoczi return timeout; 2338c6b0356SStefan Hajnoczi } 2348c6b0356SStefan Hajnoczi 2358c6b0356SStefan Hajnoczi int64_t 2368c6b0356SStefan Hajnoczi aio_compute_timeout(AioContext *ctx) 2378c6b0356SStefan Hajnoczi { 2388c6b0356SStefan Hajnoczi BHListSlice *s; 2398c6b0356SStefan Hajnoczi int64_t deadline; 2408c6b0356SStefan Hajnoczi int timeout = -1; 2418c6b0356SStefan Hajnoczi 2428c6b0356SStefan Hajnoczi timeout = aio_compute_bh_timeout(&ctx->bh_list, timeout); 2438c6b0356SStefan Hajnoczi if (timeout == 0) { 2448c6b0356SStefan Hajnoczi return 0; 2458c6b0356SStefan Hajnoczi } 2468c6b0356SStefan Hajnoczi 2478c6b0356SStefan Hajnoczi QSIMPLEQ_FOREACH(s, &ctx->bh_slice_list, next) { 2488c6b0356SStefan Hajnoczi timeout = aio_compute_bh_timeout(&s->bh_list, timeout); 2498c6b0356SStefan Hajnoczi if (timeout == 0) { 2508c6b0356SStefan Hajnoczi return 0; 2518c6b0356SStefan Hajnoczi } 2528c6b0356SStefan Hajnoczi } 2538c6b0356SStefan Hajnoczi 254c2b38b27SPaolo Bonzini deadline = timerlistgroup_deadline_ns(&ctx->tlg); 255c2b38b27SPaolo Bonzini if (deadline == 0) { 256c2b38b27SPaolo Bonzini return 0; 257c2b38b27SPaolo Bonzini } else { 258c2b38b27SPaolo Bonzini return qemu_soonest_timeout(timeout, deadline); 259c2b38b27SPaolo Bonzini } 260c2b38b27SPaolo Bonzini } 261c2b38b27SPaolo Bonzini 262c2b38b27SPaolo Bonzini static gboolean 263c2b38b27SPaolo Bonzini aio_ctx_prepare(GSource *source, gint *timeout) 264c2b38b27SPaolo Bonzini { 265c2b38b27SPaolo Bonzini AioContext *ctx = (AioContext *) source; 266c2b38b27SPaolo Bonzini 267d73415a3SStefan Hajnoczi qatomic_set(&ctx->notify_me, qatomic_read(&ctx->notify_me) | 1); 2685710a3e0SPaolo Bonzini 2695710a3e0SPaolo Bonzini /* 2705710a3e0SPaolo Bonzini * Write ctx->notify_me before computing the timeout 2715710a3e0SPaolo Bonzini * (reading bottom half flags, etc.). Pairs with 2725710a3e0SPaolo Bonzini * smp_mb in aio_notify(). 2735710a3e0SPaolo Bonzini */ 2745710a3e0SPaolo Bonzini smp_mb(); 275c2b38b27SPaolo Bonzini 276c2b38b27SPaolo Bonzini /* We assume there is no timeout already supplied */ 277c2b38b27SPaolo Bonzini *timeout = qemu_timeout_ns_to_ms(aio_compute_timeout(ctx)); 278c2b38b27SPaolo Bonzini 279c2b38b27SPaolo Bonzini if (aio_prepare(ctx)) { 280c2b38b27SPaolo Bonzini *timeout = 0; 281c2b38b27SPaolo Bonzini } 282c2b38b27SPaolo Bonzini 283c2b38b27SPaolo Bonzini return *timeout == 0; 284c2b38b27SPaolo Bonzini } 285c2b38b27SPaolo Bonzini 286c2b38b27SPaolo Bonzini static gboolean 287c2b38b27SPaolo Bonzini aio_ctx_check(GSource *source) 288c2b38b27SPaolo Bonzini { 289c2b38b27SPaolo Bonzini AioContext *ctx = (AioContext *) source; 290c2b38b27SPaolo Bonzini QEMUBH *bh; 2918c6b0356SStefan Hajnoczi BHListSlice *s; 292c2b38b27SPaolo Bonzini 2935710a3e0SPaolo Bonzini /* Finish computing the timeout before clearing the flag. */ 294d73415a3SStefan Hajnoczi qatomic_store_release(&ctx->notify_me, qatomic_read(&ctx->notify_me) & ~1); 295c2b38b27SPaolo Bonzini aio_notify_accept(ctx); 296c2b38b27SPaolo Bonzini 2978c6b0356SStefan Hajnoczi QSLIST_FOREACH_RCU(bh, &ctx->bh_list, next) { 2988c6b0356SStefan Hajnoczi if ((bh->flags & (BH_SCHEDULED | BH_DELETED)) == BH_SCHEDULED) { 299c2b38b27SPaolo Bonzini return true; 300c2b38b27SPaolo Bonzini } 301c2b38b27SPaolo Bonzini } 3028c6b0356SStefan Hajnoczi 3038c6b0356SStefan Hajnoczi QSIMPLEQ_FOREACH(s, &ctx->bh_slice_list, next) { 3048c6b0356SStefan Hajnoczi QSLIST_FOREACH_RCU(bh, &s->bh_list, next) { 3058c6b0356SStefan Hajnoczi if ((bh->flags & (BH_SCHEDULED | BH_DELETED)) == BH_SCHEDULED) { 3068c6b0356SStefan Hajnoczi return true; 3078c6b0356SStefan Hajnoczi } 3088c6b0356SStefan Hajnoczi } 3098c6b0356SStefan Hajnoczi } 310c2b38b27SPaolo Bonzini return aio_pending(ctx) || (timerlistgroup_deadline_ns(&ctx->tlg) == 0); 311c2b38b27SPaolo Bonzini } 312c2b38b27SPaolo Bonzini 313c2b38b27SPaolo Bonzini static gboolean 314c2b38b27SPaolo Bonzini aio_ctx_dispatch(GSource *source, 315c2b38b27SPaolo Bonzini GSourceFunc callback, 316c2b38b27SPaolo Bonzini gpointer user_data) 317c2b38b27SPaolo Bonzini { 318c2b38b27SPaolo Bonzini AioContext *ctx = (AioContext *) source; 319c2b38b27SPaolo Bonzini 320c2b38b27SPaolo Bonzini assert(callback == NULL); 321a153bf52SPaolo Bonzini aio_dispatch(ctx); 322c2b38b27SPaolo Bonzini return true; 323c2b38b27SPaolo Bonzini } 324c2b38b27SPaolo Bonzini 325c2b38b27SPaolo Bonzini static void 326c2b38b27SPaolo Bonzini aio_ctx_finalize(GSource *source) 327c2b38b27SPaolo Bonzini { 328c2b38b27SPaolo Bonzini AioContext *ctx = (AioContext *) source; 3298c6b0356SStefan Hajnoczi QEMUBH *bh; 3308c6b0356SStefan Hajnoczi unsigned flags; 331c2b38b27SPaolo Bonzini 332c2b38b27SPaolo Bonzini thread_pool_free(ctx->thread_pool); 333c2b38b27SPaolo Bonzini 334c2b38b27SPaolo Bonzini #ifdef CONFIG_LINUX_AIO 335c2b38b27SPaolo Bonzini if (ctx->linux_aio) { 336c2b38b27SPaolo Bonzini laio_detach_aio_context(ctx->linux_aio, ctx); 337c2b38b27SPaolo Bonzini laio_cleanup(ctx->linux_aio); 338c2b38b27SPaolo Bonzini ctx->linux_aio = NULL; 339c2b38b27SPaolo Bonzini } 340c2b38b27SPaolo Bonzini #endif 341c2b38b27SPaolo Bonzini 342fcb7a4a4SAarushi Mehta #ifdef CONFIG_LINUX_IO_URING 343fcb7a4a4SAarushi Mehta if (ctx->linux_io_uring) { 344fcb7a4a4SAarushi Mehta luring_detach_aio_context(ctx->linux_io_uring, ctx); 345fcb7a4a4SAarushi Mehta luring_cleanup(ctx->linux_io_uring); 346fcb7a4a4SAarushi Mehta ctx->linux_io_uring = NULL; 347fcb7a4a4SAarushi Mehta } 348fcb7a4a4SAarushi Mehta #endif 349fcb7a4a4SAarushi Mehta 3500c330a73SPaolo Bonzini assert(QSLIST_EMPTY(&ctx->scheduled_coroutines)); 3510c330a73SPaolo Bonzini qemu_bh_delete(ctx->co_schedule_bh); 3520c330a73SPaolo Bonzini 3538c6b0356SStefan Hajnoczi /* There must be no aio_bh_poll() calls going on */ 3548c6b0356SStefan Hajnoczi assert(QSIMPLEQ_EMPTY(&ctx->bh_slice_list)); 355c2b38b27SPaolo Bonzini 3568c6b0356SStefan Hajnoczi while ((bh = aio_bh_dequeue(&ctx->bh_list, &flags))) { 357023ca420SStefan Hajnoczi /* 358023ca420SStefan Hajnoczi * qemu_bh_delete() must have been called on BHs in this AioContext. In 359023ca420SStefan Hajnoczi * many cases memory leaks, hangs, or inconsistent state occur when a 360023ca420SStefan Hajnoczi * BH is leaked because something still expects it to run. 361023ca420SStefan Hajnoczi * 362023ca420SStefan Hajnoczi * If you hit this, fix the lifecycle of the BH so that 363023ca420SStefan Hajnoczi * qemu_bh_delete() and any associated cleanup is called before the 364023ca420SStefan Hajnoczi * AioContext is finalized. 365023ca420SStefan Hajnoczi */ 366023ca420SStefan Hajnoczi if (unlikely(!(flags & BH_DELETED))) { 367023ca420SStefan Hajnoczi fprintf(stderr, "%s: BH '%s' leaked, aborting...\n", 368023ca420SStefan Hajnoczi __func__, bh->name); 369023ca420SStefan Hajnoczi abort(); 370023ca420SStefan Hajnoczi } 371c2b38b27SPaolo Bonzini 3728c6b0356SStefan Hajnoczi g_free(bh); 373c2b38b27SPaolo Bonzini } 374c2b38b27SPaolo Bonzini 375826cc324SStefan Hajnoczi aio_set_event_notifier(ctx, &ctx->notifier, false, NULL, NULL, NULL); 376c2b38b27SPaolo Bonzini event_notifier_cleanup(&ctx->notifier); 377c2b38b27SPaolo Bonzini qemu_rec_mutex_destroy(&ctx->lock); 378c2b38b27SPaolo Bonzini qemu_lockcnt_destroy(&ctx->list_lock); 379c2b38b27SPaolo Bonzini timerlistgroup_deinit(&ctx->tlg); 380*587d82faSEmanuele Giuseppe Esposito unregister_aiocontext(ctx); 381cd0a6d2bSJie Wang aio_context_destroy(ctx); 382c2b38b27SPaolo Bonzini } 383c2b38b27SPaolo Bonzini 384c2b38b27SPaolo Bonzini static GSourceFuncs aio_source_funcs = { 385c2b38b27SPaolo Bonzini aio_ctx_prepare, 386c2b38b27SPaolo Bonzini aio_ctx_check, 387c2b38b27SPaolo Bonzini aio_ctx_dispatch, 388c2b38b27SPaolo Bonzini aio_ctx_finalize 389c2b38b27SPaolo Bonzini }; 390c2b38b27SPaolo Bonzini 391c2b38b27SPaolo Bonzini GSource *aio_get_g_source(AioContext *ctx) 392c2b38b27SPaolo Bonzini { 393ba607ca8SStefan Hajnoczi aio_context_use_g_source(ctx); 394c2b38b27SPaolo Bonzini g_source_ref(&ctx->source); 395c2b38b27SPaolo Bonzini return &ctx->source; 396c2b38b27SPaolo Bonzini } 397c2b38b27SPaolo Bonzini 398c2b38b27SPaolo Bonzini ThreadPool *aio_get_thread_pool(AioContext *ctx) 399c2b38b27SPaolo Bonzini { 400c2b38b27SPaolo Bonzini if (!ctx->thread_pool) { 401c2b38b27SPaolo Bonzini ctx->thread_pool = thread_pool_new(ctx); 402c2b38b27SPaolo Bonzini } 403c2b38b27SPaolo Bonzini return ctx->thread_pool; 404c2b38b27SPaolo Bonzini } 405c2b38b27SPaolo Bonzini 406c2b38b27SPaolo Bonzini #ifdef CONFIG_LINUX_AIO 407ed6e2161SNishanth Aravamudan LinuxAioState *aio_setup_linux_aio(AioContext *ctx, Error **errp) 408c2b38b27SPaolo Bonzini { 409c2b38b27SPaolo Bonzini if (!ctx->linux_aio) { 410ed6e2161SNishanth Aravamudan ctx->linux_aio = laio_init(errp); 411ed6e2161SNishanth Aravamudan if (ctx->linux_aio) { 412c2b38b27SPaolo Bonzini laio_attach_aio_context(ctx->linux_aio, ctx); 413c2b38b27SPaolo Bonzini } 414ed6e2161SNishanth Aravamudan } 415ed6e2161SNishanth Aravamudan return ctx->linux_aio; 416ed6e2161SNishanth Aravamudan } 417ed6e2161SNishanth Aravamudan 418ed6e2161SNishanth Aravamudan LinuxAioState *aio_get_linux_aio(AioContext *ctx) 419ed6e2161SNishanth Aravamudan { 420ed6e2161SNishanth Aravamudan assert(ctx->linux_aio); 421c2b38b27SPaolo Bonzini return ctx->linux_aio; 422c2b38b27SPaolo Bonzini } 423c2b38b27SPaolo Bonzini #endif 424c2b38b27SPaolo Bonzini 425fcb7a4a4SAarushi Mehta #ifdef CONFIG_LINUX_IO_URING 426fcb7a4a4SAarushi Mehta LuringState *aio_setup_linux_io_uring(AioContext *ctx, Error **errp) 427fcb7a4a4SAarushi Mehta { 428fcb7a4a4SAarushi Mehta if (ctx->linux_io_uring) { 429fcb7a4a4SAarushi Mehta return ctx->linux_io_uring; 430fcb7a4a4SAarushi Mehta } 431fcb7a4a4SAarushi Mehta 432fcb7a4a4SAarushi Mehta ctx->linux_io_uring = luring_init(errp); 433fcb7a4a4SAarushi Mehta if (!ctx->linux_io_uring) { 434fcb7a4a4SAarushi Mehta return NULL; 435fcb7a4a4SAarushi Mehta } 436fcb7a4a4SAarushi Mehta 437fcb7a4a4SAarushi Mehta luring_attach_aio_context(ctx->linux_io_uring, ctx); 438fcb7a4a4SAarushi Mehta return ctx->linux_io_uring; 439fcb7a4a4SAarushi Mehta } 440fcb7a4a4SAarushi Mehta 441fcb7a4a4SAarushi Mehta LuringState *aio_get_linux_io_uring(AioContext *ctx) 442fcb7a4a4SAarushi Mehta { 443fcb7a4a4SAarushi Mehta assert(ctx->linux_io_uring); 444fcb7a4a4SAarushi Mehta return ctx->linux_io_uring; 445fcb7a4a4SAarushi Mehta } 446fcb7a4a4SAarushi Mehta #endif 447fcb7a4a4SAarushi Mehta 448c2b38b27SPaolo Bonzini void aio_notify(AioContext *ctx) 449c2b38b27SPaolo Bonzini { 450601829f8SStefan Hajnoczi /* 451601829f8SStefan Hajnoczi * Write e.g. bh->flags before writing ctx->notified. Pairs with smp_mb in 452601829f8SStefan Hajnoczi * aio_notify_accept. 453601829f8SStefan Hajnoczi */ 454601829f8SStefan Hajnoczi smp_wmb(); 455d73415a3SStefan Hajnoczi qatomic_set(&ctx->notified, true); 456601829f8SStefan Hajnoczi 457601829f8SStefan Hajnoczi /* 458601829f8SStefan Hajnoczi * Write ctx->notified before reading ctx->notify_me. Pairs 4595710a3e0SPaolo Bonzini * with smp_mb in aio_ctx_prepare or aio_poll. 460c2b38b27SPaolo Bonzini */ 461c2b38b27SPaolo Bonzini smp_mb(); 462d73415a3SStefan Hajnoczi if (qatomic_read(&ctx->notify_me)) { 463c2b38b27SPaolo Bonzini event_notifier_set(&ctx->notifier); 464c2b38b27SPaolo Bonzini } 465c2b38b27SPaolo Bonzini } 466c2b38b27SPaolo Bonzini 467c2b38b27SPaolo Bonzini void aio_notify_accept(AioContext *ctx) 468c2b38b27SPaolo Bonzini { 469d73415a3SStefan Hajnoczi qatomic_set(&ctx->notified, false); 470601829f8SStefan Hajnoczi 471601829f8SStefan Hajnoczi /* 472601829f8SStefan Hajnoczi * Write ctx->notified before reading e.g. bh->flags. Pairs with smp_wmb 473601829f8SStefan Hajnoczi * in aio_notify. 474601829f8SStefan Hajnoczi */ 475601829f8SStefan Hajnoczi smp_mb(); 476c2b38b27SPaolo Bonzini } 477c2b38b27SPaolo Bonzini 4783f53bc61SPaolo Bonzini static void aio_timerlist_notify(void *opaque, QEMUClockType type) 479c2b38b27SPaolo Bonzini { 480c2b38b27SPaolo Bonzini aio_notify(opaque); 481c2b38b27SPaolo Bonzini } 482c2b38b27SPaolo Bonzini 483601829f8SStefan Hajnoczi static void aio_context_notifier_cb(EventNotifier *e) 484c2b38b27SPaolo Bonzini { 485601829f8SStefan Hajnoczi AioContext *ctx = container_of(e, AioContext, notifier); 486601829f8SStefan Hajnoczi 487601829f8SStefan Hajnoczi event_notifier_test_and_clear(&ctx->notifier); 488c2b38b27SPaolo Bonzini } 489c2b38b27SPaolo Bonzini 490c2b38b27SPaolo Bonzini /* Returns true if aio_notify() was called (e.g. a BH was scheduled) */ 491c13be5a1SStefan Hajnoczi static bool aio_context_notifier_poll(void *opaque) 492c2b38b27SPaolo Bonzini { 493c2b38b27SPaolo Bonzini EventNotifier *e = opaque; 494c2b38b27SPaolo Bonzini AioContext *ctx = container_of(e, AioContext, notifier); 495c2b38b27SPaolo Bonzini 496d73415a3SStefan Hajnoczi return qatomic_read(&ctx->notified); 497c2b38b27SPaolo Bonzini } 498c2b38b27SPaolo Bonzini 499826cc324SStefan Hajnoczi static void aio_context_notifier_poll_ready(EventNotifier *e) 500826cc324SStefan Hajnoczi { 501826cc324SStefan Hajnoczi /* Do nothing, we just wanted to kick the event loop */ 502826cc324SStefan Hajnoczi } 503826cc324SStefan Hajnoczi 5040c330a73SPaolo Bonzini static void co_schedule_bh_cb(void *opaque) 5050c330a73SPaolo Bonzini { 5060c330a73SPaolo Bonzini AioContext *ctx = opaque; 5070c330a73SPaolo Bonzini QSLIST_HEAD(, Coroutine) straight, reversed; 5080c330a73SPaolo Bonzini 5090c330a73SPaolo Bonzini QSLIST_MOVE_ATOMIC(&reversed, &ctx->scheduled_coroutines); 5100c330a73SPaolo Bonzini QSLIST_INIT(&straight); 5110c330a73SPaolo Bonzini 5120c330a73SPaolo Bonzini while (!QSLIST_EMPTY(&reversed)) { 5130c330a73SPaolo Bonzini Coroutine *co = QSLIST_FIRST(&reversed); 5140c330a73SPaolo Bonzini QSLIST_REMOVE_HEAD(&reversed, co_scheduled_next); 5150c330a73SPaolo Bonzini QSLIST_INSERT_HEAD(&straight, co, co_scheduled_next); 5160c330a73SPaolo Bonzini } 5170c330a73SPaolo Bonzini 5180c330a73SPaolo Bonzini while (!QSLIST_EMPTY(&straight)) { 5190c330a73SPaolo Bonzini Coroutine *co = QSLIST_FIRST(&straight); 5200c330a73SPaolo Bonzini QSLIST_REMOVE_HEAD(&straight, co_scheduled_next); 5210c330a73SPaolo Bonzini trace_aio_co_schedule_bh_cb(ctx, co); 5221919631eSPaolo Bonzini aio_context_acquire(ctx); 5236133b39fSJeff Cody 5246133b39fSJeff Cody /* Protected by write barrier in qemu_aio_coroutine_enter */ 525d73415a3SStefan Hajnoczi qatomic_set(&co->scheduled, NULL); 5266808ae04SSergio Lopez qemu_aio_coroutine_enter(ctx, co); 5271919631eSPaolo Bonzini aio_context_release(ctx); 5280c330a73SPaolo Bonzini } 5290c330a73SPaolo Bonzini } 5300c330a73SPaolo Bonzini 531c2b38b27SPaolo Bonzini AioContext *aio_context_new(Error **errp) 532c2b38b27SPaolo Bonzini { 533c2b38b27SPaolo Bonzini int ret; 534c2b38b27SPaolo Bonzini AioContext *ctx; 535c2b38b27SPaolo Bonzini 536c2b38b27SPaolo Bonzini ctx = (AioContext *) g_source_new(&aio_source_funcs, sizeof(AioContext)); 5378c6b0356SStefan Hajnoczi QSLIST_INIT(&ctx->bh_list); 5388c6b0356SStefan Hajnoczi QSIMPLEQ_INIT(&ctx->bh_slice_list); 539c2b38b27SPaolo Bonzini aio_context_setup(ctx); 540c2b38b27SPaolo Bonzini 541c2b38b27SPaolo Bonzini ret = event_notifier_init(&ctx->notifier, false); 542c2b38b27SPaolo Bonzini if (ret < 0) { 543c2b38b27SPaolo Bonzini error_setg_errno(errp, -ret, "Failed to initialize event notifier"); 544c2b38b27SPaolo Bonzini goto fail; 545c2b38b27SPaolo Bonzini } 546c2b38b27SPaolo Bonzini g_source_set_can_recurse(&ctx->source, true); 547c2b38b27SPaolo Bonzini qemu_lockcnt_init(&ctx->list_lock); 5480c330a73SPaolo Bonzini 5490c330a73SPaolo Bonzini ctx->co_schedule_bh = aio_bh_new(ctx, co_schedule_bh_cb, ctx); 5500c330a73SPaolo Bonzini QSLIST_INIT(&ctx->scheduled_coroutines); 5510c330a73SPaolo Bonzini 552c2b38b27SPaolo Bonzini aio_set_event_notifier(ctx, &ctx->notifier, 553c2b38b27SPaolo Bonzini false, 554601829f8SStefan Hajnoczi aio_context_notifier_cb, 555826cc324SStefan Hajnoczi aio_context_notifier_poll, 556826cc324SStefan Hajnoczi aio_context_notifier_poll_ready); 557c2b38b27SPaolo Bonzini #ifdef CONFIG_LINUX_AIO 558c2b38b27SPaolo Bonzini ctx->linux_aio = NULL; 559c2b38b27SPaolo Bonzini #endif 560fcb7a4a4SAarushi Mehta 561fcb7a4a4SAarushi Mehta #ifdef CONFIG_LINUX_IO_URING 562fcb7a4a4SAarushi Mehta ctx->linux_io_uring = NULL; 563fcb7a4a4SAarushi Mehta #endif 564fcb7a4a4SAarushi Mehta 565c2b38b27SPaolo Bonzini ctx->thread_pool = NULL; 566c2b38b27SPaolo Bonzini qemu_rec_mutex_init(&ctx->lock); 567c2b38b27SPaolo Bonzini timerlistgroup_init(&ctx->tlg, aio_timerlist_notify, ctx); 568c2b38b27SPaolo Bonzini 569c2b38b27SPaolo Bonzini ctx->poll_ns = 0; 570c2b38b27SPaolo Bonzini ctx->poll_max_ns = 0; 571c2b38b27SPaolo Bonzini ctx->poll_grow = 0; 572c2b38b27SPaolo Bonzini ctx->poll_shrink = 0; 573c2b38b27SPaolo Bonzini 5741793ad02SStefano Garzarella ctx->aio_max_batch = 0; 5751793ad02SStefano Garzarella 57671ad4713SNicolas Saenz Julienne ctx->thread_pool_min = 0; 57771ad4713SNicolas Saenz Julienne ctx->thread_pool_max = THREAD_POOL_MAX_THREADS_DEFAULT; 57871ad4713SNicolas Saenz Julienne 579*587d82faSEmanuele Giuseppe Esposito register_aiocontext(ctx); 580*587d82faSEmanuele Giuseppe Esposito 581c2b38b27SPaolo Bonzini return ctx; 582c2b38b27SPaolo Bonzini fail: 583c2b38b27SPaolo Bonzini g_source_destroy(&ctx->source); 584c2b38b27SPaolo Bonzini return NULL; 585c2b38b27SPaolo Bonzini } 586c2b38b27SPaolo Bonzini 5870c330a73SPaolo Bonzini void aio_co_schedule(AioContext *ctx, Coroutine *co) 5880c330a73SPaolo Bonzini { 5890c330a73SPaolo Bonzini trace_aio_co_schedule(ctx, co); 590d73415a3SStefan Hajnoczi const char *scheduled = qatomic_cmpxchg(&co->scheduled, NULL, 5916133b39fSJeff Cody __func__); 5926133b39fSJeff Cody 5936133b39fSJeff Cody if (scheduled) { 5946133b39fSJeff Cody fprintf(stderr, 5956133b39fSJeff Cody "%s: Co-routine was already scheduled in '%s'\n", 5966133b39fSJeff Cody __func__, scheduled); 5976133b39fSJeff Cody abort(); 5986133b39fSJeff Cody } 5996133b39fSJeff Cody 600f0f81002SStefan Hajnoczi /* The coroutine might run and release the last ctx reference before we 601f0f81002SStefan Hajnoczi * invoke qemu_bh_schedule(). Take a reference to keep ctx alive until 602f0f81002SStefan Hajnoczi * we're done. 603f0f81002SStefan Hajnoczi */ 604f0f81002SStefan Hajnoczi aio_context_ref(ctx); 605f0f81002SStefan Hajnoczi 6060c330a73SPaolo Bonzini QSLIST_INSERT_HEAD_ATOMIC(&ctx->scheduled_coroutines, 6070c330a73SPaolo Bonzini co, co_scheduled_next); 6080c330a73SPaolo Bonzini qemu_bh_schedule(ctx->co_schedule_bh); 609f0f81002SStefan Hajnoczi 610f0f81002SStefan Hajnoczi aio_context_unref(ctx); 6110c330a73SPaolo Bonzini } 6120c330a73SPaolo Bonzini 61326b0b698SKevin Wolf typedef struct AioCoRescheduleSelf { 61426b0b698SKevin Wolf Coroutine *co; 61526b0b698SKevin Wolf AioContext *new_ctx; 61626b0b698SKevin Wolf } AioCoRescheduleSelf; 61726b0b698SKevin Wolf 61826b0b698SKevin Wolf static void aio_co_reschedule_self_bh(void *opaque) 61926b0b698SKevin Wolf { 62026b0b698SKevin Wolf AioCoRescheduleSelf *data = opaque; 62126b0b698SKevin Wolf aio_co_schedule(data->new_ctx, data->co); 62226b0b698SKevin Wolf } 62326b0b698SKevin Wolf 62426b0b698SKevin Wolf void coroutine_fn aio_co_reschedule_self(AioContext *new_ctx) 62526b0b698SKevin Wolf { 62626b0b698SKevin Wolf AioContext *old_ctx = qemu_get_current_aio_context(); 62726b0b698SKevin Wolf 62826b0b698SKevin Wolf if (old_ctx != new_ctx) { 62926b0b698SKevin Wolf AioCoRescheduleSelf data = { 63026b0b698SKevin Wolf .co = qemu_coroutine_self(), 63126b0b698SKevin Wolf .new_ctx = new_ctx, 63226b0b698SKevin Wolf }; 63326b0b698SKevin Wolf /* 63426b0b698SKevin Wolf * We can't directly schedule the coroutine in the target context 63526b0b698SKevin Wolf * because this would be racy: The other thread could try to enter the 63626b0b698SKevin Wolf * coroutine before it has yielded in this one. 63726b0b698SKevin Wolf */ 63826b0b698SKevin Wolf aio_bh_schedule_oneshot(old_ctx, aio_co_reschedule_self_bh, &data); 63926b0b698SKevin Wolf qemu_coroutine_yield(); 64026b0b698SKevin Wolf } 64126b0b698SKevin Wolf } 64226b0b698SKevin Wolf 6430c330a73SPaolo Bonzini void aio_co_wake(struct Coroutine *co) 6440c330a73SPaolo Bonzini { 6450c330a73SPaolo Bonzini AioContext *ctx; 6460c330a73SPaolo Bonzini 6470c330a73SPaolo Bonzini /* Read coroutine before co->ctx. Matches smp_wmb in 6480c330a73SPaolo Bonzini * qemu_coroutine_enter. 6490c330a73SPaolo Bonzini */ 6500c330a73SPaolo Bonzini smp_read_barrier_depends(); 651d73415a3SStefan Hajnoczi ctx = qatomic_read(&co->ctx); 6520c330a73SPaolo Bonzini 6538865852eSFam Zheng aio_co_enter(ctx, co); 6548865852eSFam Zheng } 6558865852eSFam Zheng 6568865852eSFam Zheng void aio_co_enter(AioContext *ctx, struct Coroutine *co) 6578865852eSFam Zheng { 6580c330a73SPaolo Bonzini if (ctx != qemu_get_current_aio_context()) { 6590c330a73SPaolo Bonzini aio_co_schedule(ctx, co); 6600c330a73SPaolo Bonzini return; 6610c330a73SPaolo Bonzini } 6620c330a73SPaolo Bonzini 6630c330a73SPaolo Bonzini if (qemu_in_coroutine()) { 6640c330a73SPaolo Bonzini Coroutine *self = qemu_coroutine_self(); 6650c330a73SPaolo Bonzini assert(self != co); 6660c330a73SPaolo Bonzini QSIMPLEQ_INSERT_TAIL(&self->co_queue_wakeup, co, co_queue_next); 6670c330a73SPaolo Bonzini } else { 6680c330a73SPaolo Bonzini aio_context_acquire(ctx); 6698865852eSFam Zheng qemu_aio_coroutine_enter(ctx, co); 6700c330a73SPaolo Bonzini aio_context_release(ctx); 6710c330a73SPaolo Bonzini } 6720c330a73SPaolo Bonzini } 6730c330a73SPaolo Bonzini 674c2b38b27SPaolo Bonzini void aio_context_ref(AioContext *ctx) 675c2b38b27SPaolo Bonzini { 676c2b38b27SPaolo Bonzini g_source_ref(&ctx->source); 677c2b38b27SPaolo Bonzini } 678c2b38b27SPaolo Bonzini 679c2b38b27SPaolo Bonzini void aio_context_unref(AioContext *ctx) 680c2b38b27SPaolo Bonzini { 681c2b38b27SPaolo Bonzini g_source_unref(&ctx->source); 682c2b38b27SPaolo Bonzini } 683c2b38b27SPaolo Bonzini 684c2b38b27SPaolo Bonzini void aio_context_acquire(AioContext *ctx) 685c2b38b27SPaolo Bonzini { 686c2b38b27SPaolo Bonzini qemu_rec_mutex_lock(&ctx->lock); 687c2b38b27SPaolo Bonzini } 688c2b38b27SPaolo Bonzini 689c2b38b27SPaolo Bonzini void aio_context_release(AioContext *ctx) 690c2b38b27SPaolo Bonzini { 691c2b38b27SPaolo Bonzini qemu_rec_mutex_unlock(&ctx->lock); 692c2b38b27SPaolo Bonzini } 6935f50be9bSPaolo Bonzini 69447b74464SStefan Hajnoczi QEMU_DEFINE_STATIC_CO_TLS(AioContext *, my_aiocontext) 6955f50be9bSPaolo Bonzini 6965f50be9bSPaolo Bonzini AioContext *qemu_get_current_aio_context(void) 6975f50be9bSPaolo Bonzini { 69847b74464SStefan Hajnoczi AioContext *ctx = get_my_aiocontext(); 69947b74464SStefan Hajnoczi if (ctx) { 70047b74464SStefan Hajnoczi return ctx; 7015f50be9bSPaolo Bonzini } 7025f50be9bSPaolo Bonzini if (qemu_mutex_iothread_locked()) { 7035f50be9bSPaolo Bonzini /* Possibly in a vCPU thread. */ 7045f50be9bSPaolo Bonzini return qemu_get_aio_context(); 7055f50be9bSPaolo Bonzini } 7065f50be9bSPaolo Bonzini return NULL; 7075f50be9bSPaolo Bonzini } 7085f50be9bSPaolo Bonzini 7095f50be9bSPaolo Bonzini void qemu_set_current_aio_context(AioContext *ctx) 7105f50be9bSPaolo Bonzini { 71147b74464SStefan Hajnoczi assert(!get_my_aiocontext()); 71247b74464SStefan Hajnoczi set_my_aiocontext(ctx); 7135f50be9bSPaolo Bonzini } 71471ad4713SNicolas Saenz Julienne 71571ad4713SNicolas Saenz Julienne void aio_context_set_thread_pool_params(AioContext *ctx, int64_t min, 71671ad4713SNicolas Saenz Julienne int64_t max, Error **errp) 71771ad4713SNicolas Saenz Julienne { 71871ad4713SNicolas Saenz Julienne 71971ad4713SNicolas Saenz Julienne if (min > max || !max || min > INT_MAX || max > INT_MAX) { 72071ad4713SNicolas Saenz Julienne error_setg(errp, "bad thread-pool-min/thread-pool-max values"); 72171ad4713SNicolas Saenz Julienne return; 72271ad4713SNicolas Saenz Julienne } 72371ad4713SNicolas Saenz Julienne 72471ad4713SNicolas Saenz Julienne ctx->thread_pool_min = min; 72571ad4713SNicolas Saenz Julienne ctx->thread_pool_max = max; 72671ad4713SNicolas Saenz Julienne 72771ad4713SNicolas Saenz Julienne if (ctx->thread_pool) { 72871ad4713SNicolas Saenz Julienne thread_pool_update_params(ctx->thread_pool, ctx); 72971ad4713SNicolas Saenz Julienne } 73071ad4713SNicolas Saenz Julienne } 731