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bh=SSwCeO8zJBYXyQ1mZfi7jfoxgA087Gw9juqpPvR203E=; b=JtpVrj5KbcGQDDP6YLhE/hCjIZ+Qx4tfhCRYBWm66pn8vgZKImLKRzeEpyXmv/ZC9XfTDr ohzSDk0wSakDeuBqTG2nE+uZpgiZXg5mU31UV/fegQbpoWpuZZb4NacG4boTRttodXwBYa z2S6xabLgylzyt/lbmPWxY2cZ/v0xW8= X-MC-Unique: C4DbK-QWNYOjmaXsPBpTXw-1 From: Kevin Wolf To: qemu-block@nongnu.org Cc: kwolf@redhat.com, richard.henderson@linaro.org, qemu-devel@nongnu.org Subject: [PULL 18/18] tested: add test for nested aio_poll() in poll handlers Date: Wed, 17 May 2023 18:51:16 +0200 Message-Id: <20230517165116.475123-19-kwolf@redhat.com> In-Reply-To: <20230517165116.475123-1-kwolf@redhat.com> References: <20230517165116.475123-1-kwolf@redhat.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-Scanned-By: MIMEDefang 3.1 on 10.11.54.2 Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=170.10.129.124; envelope-from=kwolf@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.001, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, T_SCC_BODY_TEXT_LINE=-0.01 autolearn=unavailable autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: qemu-devel-bounces+importer=patchew.org@nongnu.org X-ZohoMail-DKIM: pass (identity @redhat.com) X-ZM-MESSAGEID: 1684342402267100005 Content-Type: text/plain; charset="utf-8" From: Stefan Hajnoczi Signed-off-by: Stefan Hajnoczi Message-Id: <20230502184134.534703-3-stefanha@redhat.com> Tested-by: Kevin Wolf Signed-off-by: Kevin Wolf --- tests/unit/test-nested-aio-poll.c | 130 ++++++++++++++++++++++++++++++ tests/unit/meson.build | 1 + 2 files changed, 131 insertions(+) create mode 100644 tests/unit/test-nested-aio-poll.c diff --git a/tests/unit/test-nested-aio-poll.c b/tests/unit/test-nested-aio= -poll.c new file mode 100644 index 0000000000..9bbe18b839 --- /dev/null +++ b/tests/unit/test-nested-aio-poll.c @@ -0,0 +1,130 @@ +/* SPDX-License-Identifier: GPL-2.0-or-later */ +/* + * Test that poll handlers are not re-entrant in nested aio_poll() + * + * Copyright Red Hat + * + * Poll handlers are usually level-triggered. That means they continue fir= ing + * until the condition is reset (e.g. a virtqueue becomes empty). If a poll + * handler calls nested aio_poll() before the condition is reset, then inf= inite + * recursion occurs. + * + * aio_poll() is supposed to prevent this by disabling poll handlers in ne= sted + * aio_poll() calls. This test case checks that this is indeed what happen= s. + */ +#include "qemu/osdep.h" +#include "block/aio.h" +#include "qapi/error.h" + +typedef struct { + AioContext *ctx; + + /* This is the EventNotifier that drives the test */ + EventNotifier poll_notifier; + + /* This EventNotifier is only used to wake aio_poll() */ + EventNotifier dummy_notifier; + + bool nested; +} TestData; + +static void io_read(EventNotifier *notifier) +{ + fprintf(stderr, "%s %p\n", __func__, notifier); + event_notifier_test_and_clear(notifier); +} + +static bool io_poll_true(void *opaque) +{ + fprintf(stderr, "%s %p\n", __func__, opaque); + return true; +} + +static bool io_poll_false(void *opaque) +{ + fprintf(stderr, "%s %p\n", __func__, opaque); + return false; +} + +static void io_poll_ready(EventNotifier *notifier) +{ + TestData *td =3D container_of(notifier, TestData, poll_notifier); + + fprintf(stderr, "> %s\n", __func__); + + g_assert(!td->nested); + td->nested =3D true; + + /* Wake the following nested aio_poll() call */ + event_notifier_set(&td->dummy_notifier); + + /* This nested event loop must not call io_poll()/io_poll_ready() */ + g_assert(aio_poll(td->ctx, true)); + + td->nested =3D false; + + fprintf(stderr, "< %s\n", __func__); +} + +/* dummy_notifier never triggers */ +static void io_poll_never_ready(EventNotifier *notifier) +{ + g_assert_not_reached(); +} + +static void test(void) +{ + TestData td =3D { + .ctx =3D aio_context_new(&error_abort), + }; + + qemu_set_current_aio_context(td.ctx); + + /* Enable polling */ + aio_context_set_poll_params(td.ctx, 1000000, 2, 2, &error_abort); + + /* + * The GSource is unused but this has the side-effect of changing the = fdmon + * that AioContext uses. + */ + aio_get_g_source(td.ctx); + + /* Make the event notifier active (set) right away */ + event_notifier_init(&td.poll_notifier, 1); + aio_set_event_notifier(td.ctx, &td.poll_notifier, false, + io_read, io_poll_true, io_poll_ready); + + /* This event notifier will be used later */ + event_notifier_init(&td.dummy_notifier, 0); + aio_set_event_notifier(td.ctx, &td.dummy_notifier, false, + io_read, io_poll_false, io_poll_never_ready); + + /* Consume aio_notify() */ + g_assert(!aio_poll(td.ctx, false)); + + /* + * Run the io_read() handler. This has the side-effect of activating + * polling in future aio_poll() calls. + */ + g_assert(aio_poll(td.ctx, true)); + + /* The second time around the io_poll()/io_poll_ready() handler runs */ + g_assert(aio_poll(td.ctx, true)); + + /* Run io_poll()/io_poll_ready() one more time to show it keeps workin= g */ + g_assert(aio_poll(td.ctx, true)); + + aio_set_event_notifier(td.ctx, &td.dummy_notifier, false, + NULL, NULL, NULL); + aio_set_event_notifier(td.ctx, &td.poll_notifier, false, NULL, NULL, N= ULL); + event_notifier_cleanup(&td.dummy_notifier); + event_notifier_cleanup(&td.poll_notifier); + aio_context_unref(td.ctx); +} + +int main(int argc, char **argv) +{ + g_test_init(&argc, &argv, NULL); + g_test_add_func("/nested-aio-poll", test); + return g_test_run(); +} diff --git a/tests/unit/meson.build b/tests/unit/meson.build index 3bc78d8660..a314f82baa 100644 --- a/tests/unit/meson.build +++ b/tests/unit/meson.build @@ -67,6 +67,7 @@ if have_block 'test-coroutine': [testblock], 'test-aio': [testblock], 'test-aio-multithread': [testblock], + 'test-nested-aio-poll': [testblock], 'test-throttle': [testblock], 'test-thread-pool': [testblock], 'test-hbitmap': [testblock], --=20 2.40.1