Merge tag 'block-pull-request' of https://gitlab.com/stefanha/qemu into staging

Pull request

- Add new thread-pool-min/thread-pool-max parameters to control the thread pool
  used for async I/O.

- Fix virtio-scsi IOThread 100% CPU consumption QEMU 7.0 regression.

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# gpg: Signature made Mon 09 May 2022 05:52:56 AM PDT
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# gpg: Good signature from "Stefan Hajnoczi <stefanha@redhat.com>" [full]
# gpg:                 aka "Stefan Hajnoczi <stefanha@gmail.com>" [full]

* tag 'block-pull-request' of https://gitlab.com/stefanha/qemu:
  virtio-scsi: move request-related items from .h to .c
  virtio-scsi: clean up virtio_scsi_handle_cmd_vq()
  virtio-scsi: clean up virtio_scsi_handle_ctrl_vq()
  virtio-scsi: clean up virtio_scsi_handle_event_vq()
  virtio-scsi: don't waste CPU polling the event virtqueue
  virtio-scsi: fix ctrl and event handler functions in dataplane mode
  util/event-loop-base: Introduce options to set the thread pool size
  util/main-loop: Introduce the main loop into QOM
  Introduce event-loop-base abstract class

Signed-off-by: Richard Henderson <richard.henderson@linaro.org>

1 files changed, 20 insertions, 0 deletions

diff --git a/util/async.c b/util/async.c
index 2ea1172f3e..554ba70cca 100644
--- a/util/async.c
+++ b/util/async.c
@@ -563,6 +563,9 @@ AioContext *aio_context_new(Error **errp)
 
     ctx->aio_max_batch = 0;
 
+    ctx->thread_pool_min = 0;
+    ctx->thread_pool_max = THREAD_POOL_MAX_THREADS_DEFAULT;
+
     return ctx;
 fail:
     g_source_destroy(&ctx->source);
@@ -696,3 +699,20 @@ void qemu_set_current_aio_context(AioContext *ctx)
     assert(!get_my_aiocontext());
     set_my_aiocontext(ctx);
 }
+
+void aio_context_set_thread_pool_params(AioContext *ctx, int64_t min,
+                                        int64_t max, Error **errp)
+{
+
+    if (min > max || !max || min > INT_MAX || max > INT_MAX) {
+        error_setg(errp, "bad thread-pool-min/thread-pool-max values");
+        return;
+    }
+
+    ctx->thread_pool_min = min;
+    ctx->thread_pool_max = max;
+
+    if (ctx->thread_pool) {
+        thread_pool_update_params(ctx->thread_pool, ctx);
+    }
+}