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[109.242.226.125]) by smtp.gmail.com with ESMTPSA id a20-20020a05600c349400b00416a7313deasm1622874wmq.4.2024.04.10.04.43.40 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 10 Apr 2024 04:43:41 -0700 (PDT) X-BeenThere: xen-devel@lists.xenproject.org List-Id: Xen developer discussion List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Errors-To: xen-devel-bounces@lists.xenproject.org Precedence: list Sender: "Xen-devel" X-Inumbo-ID: 94dcd558-f72f-11ee-94a3-07e782e9044d DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; t=1712749422; x=1713354222; darn=lists.xenproject.org; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date :message-id:reply-to; bh=30QgisvmYFSN9sJ9N9ya959fCAYBnhZkkLkxzE/5MPo=; b=dNmQDbqR/u7QQuz8XOmtBiYVVo+sQBzYAsaMCslLxG06neU88pxNATocQXWndqXowz KwEcFTeggRSquqiHP/uIabTek85XxDLfG+HHVLCs7EjObWaqt0vhGtI6stNxxrhq5d0y h2S2I6RgxQifLhZkVpLsaTp3HRDP1qU+cAOUNvHHjKSxgpJSJZ+dNBaSZL4JCeYxZwj2 q8I29wKi1SYXqN6aM5m35iQA4Ern4GOWVfYjqxRAX1qosP28n1vyCpszDcoqaawQ1Ctb m190ePTXN8bd2qXYvQUvz0PipqbpZF7DLGvyfuLAjcROLnsorxJQPp3SwsZnAZ2BjGvP 5YQA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1712749422; x=1713354222; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=30QgisvmYFSN9sJ9N9ya959fCAYBnhZkkLkxzE/5MPo=; b=JZy5qWKY7naxRqoSvr644uIGuQY6wCsOuY4QTjMGwTVG9RcMsorQe+zncnWGRxoZkT 8U/bCj8fKgwgei1yb8sJUGB/metIg6Bi95i1K2AJip5RSlFrKGDHAgkH99R6oXlWKAfL fbmmI1LXWJ8SyVbFfkemcLIOPcv28fuoiZskw2MWxeRbjtf5P/IJ5sdkeeK75TJr9e5A Ra9+ukRx8+aFaIBSOQdCHFHqTTQy2ShDcoJN/WyozoKFJjvhuHg4qDFAjjSnTGZMlrKJ SDCcxUaNpTK+IYPm7uykuR5+Qc2UBdeVHR4jkd3VHQh3ZNdiJLPt0uqoK2dEHpfPCkoj BgOw== X-Gm-Message-State: AOJu0YzZ/7gGcbsVk4/CdVvBnTFWGQX/R/8U8WqzTBuxd4FnDFuZXoRe o7/3dAlv4/bENM7g/UEPQZmmkNE0bEaWC7BpsnOxelaGqByi6upQJYbpTNnohtt4FbaPw6NRiZW I X-Google-Smtp-Source: AGHT+IE20KzbMtODb8+bNw8FvlxwWB0TqrVoVzdK6c4JfiuP/AKDBh95JYCmXDDqLRdH4oCyP4D0EA== X-Received: by 2002:a19:f706:0:b0:513:c95c:4dc4 with SMTP id z6-20020a19f706000000b00513c95c4dc4mr1362819lfe.7.1712749422025; Wed, 10 Apr 2024 04:43:42 -0700 (PDT) From: Manos Pitsidianakis To: xen-devel@lists.xenproject.org Cc: Andrew Cooper , George Dunlap , Jan Beulich , Julien Grall , Stefano Stabellini Subject: [RFC PATCH v1 1/2] libs/light: add device model start timeout env var Date: Wed, 10 Apr 2024 14:43:14 +0300 Message-Id: <334b5a46e31dbf3e8114e9ea8bafd92cf060f2af.1712748711.git.manos.pitsidianakis@linaro.org> X-Mailer: git-send-email 2.39.2 In-Reply-To: References: MIME-Version: 1.0 When debugging QEMU, the need to run it under Valgrind and asan meant the compile-time define LIBXL_DEVICE_MODEL_START_TIMEOUT must be changed to allow for `xl` to wait longer while the instrumented QEMU initializes. This commit adds support for reading the environment variable LIBXL_DEVICE_MODEL_START_TIMEOUT to configure the timeout value and otherwise fall back to the default 60. Signed-off-by: Manos Pitsidianakis --- docs/man/xl.1.pod.in | 11 +++++++++++ tools/libs/light/libxl_9pfs.c | 2 +- tools/libs/light/libxl_device.c | 2 +- tools/libs/light/libxl_dm.c | 6 +++--- tools/libs/light/libxl_dom_suspend.c | 2 +- tools/libs/light/libxl_internal.h | 6 ++++++ tools/libs/light/libxl_pci.c | 6 +++--- 7 files changed, 26 insertions(+), 9 deletions(-) diff --git docs/man/xl.1.pod.in docs/man/xl.1.pod.in index bed8393473..c159877094 100644 --- docs/man/xl.1.pod.in +++ docs/man/xl.1.pod.in @@ -1993,6 +1993,17 @@ Otherwise the build time default in LIBXL_BOOTLOADER_TIMEOUT will be used. If defined the value must be an unsigned integer between 0 and INT_MAX, otherwise behavior is undefined. Setting to 0 disables the timeout. +=item LIBXL_DEVICE_MODEL_START_TIMEOUT + +Timeout in seconds for starting the device model process. Useful in case the +device model takes an unusual amount of time to start— for example in case of +very slow I/O, in case of slow performance due to memory sanitizer usage, etc. + +If undefined, the default hard-coded value of 60 seconds is used. + +If defined, the value must be an unsigned integer between 0 and INT_MAX, +otherwise behaviour is undefined. Setting the value to 0 disables the timeout. + =back =head1 SEE ALSO diff --git tools/libs/light/libxl_9pfs.c tools/libs/light/libxl_9pfs.c index 48f894f070..950a464b45 100644 --- tools/libs/light/libxl_9pfs.c +++ tools/libs/light/libxl_9pfs.c @@ -132,7 +132,7 @@ static int xen9pfsd_spawn(libxl__egc *egc, uint32_t domid, libxl_device_p9 *p9, aop9->spawn.ao = aodev->ao; aop9->spawn.what = "xen-9pfs daemon"; aop9->spawn.xspath = GCSPRINTF("%s/state", path); - aop9->spawn.timeout_ms = LIBXL_DEVICE_MODEL_START_TIMEOUT * 1000; + aop9->spawn.timeout_ms = __libxl_device_model_start_timeout() * 1000; aop9->spawn.pidpath = GCSPRINTF("%s/pid", path); aop9->spawn.midproc_cb = libxl__spawn_record_pid; aop9->spawn.confirm_cb = xen9pfsd_confirm; diff --git tools/libs/light/libxl_device.c tools/libs/light/libxl_device.c index 6f0100d05e..452e55ba23 100644 --- tools/libs/light/libxl_device.c +++ tools/libs/light/libxl_device.c @@ -1436,7 +1436,7 @@ int libxl__wait_for_device_model_deprecated(libxl__gc *gc, path = DEVICE_MODEL_XS_PATH(gc, dm_domid, domid, "/state"); return libxl__xenstore_child_wait_deprecated(gc, domid, - LIBXL_DEVICE_MODEL_START_TIMEOUT, + __libxl_device_model_start_timeout(), "Device Model", path, state, spawning, check_callback, check_callback_userdata); } diff --git tools/libs/light/libxl_dm.c tools/libs/light/libxl_dm.c index 0b03a7c747..4369fef161 100644 --- tools/libs/light/libxl_dm.c +++ tools/libs/light/libxl_dm.c @@ -2629,7 +2629,7 @@ static void spawn_qmp_proxy(libxl__egc *egc, sdss->qmp_proxy_spawn.pidpath = GCSPRINTF("%s/image/qmp-proxy-pid", dom_path); sdss->qmp_proxy_spawn.xspath = DEVICE_MODEL_XS_PATH(gc, LIBXL_TOOLSTACK_DOMID, dm_domid, "/qmp-proxy-state"); - sdss->qmp_proxy_spawn.timeout_ms = LIBXL_DEVICE_MODEL_START_TIMEOUT * 1000; + sdss->qmp_proxy_spawn.timeout_ms = __libxl_device_model_start_timeout() * 1000; sdss->qmp_proxy_spawn.midproc_cb = libxl__spawn_record_pid; sdss->qmp_proxy_spawn.confirm_cb = qmp_proxy_confirm; sdss->qmp_proxy_spawn.failure_cb = qmp_proxy_startup_failed; @@ -3011,7 +3011,7 @@ retry_transaction: spawn->what = GCSPRINTF("domain %d device model", domid); spawn->xspath = DEVICE_MODEL_XS_PATH(gc, LIBXL_TOOLSTACK_DOMID, domid, "/state"); - spawn->timeout_ms = LIBXL_DEVICE_MODEL_START_TIMEOUT * 1000; + spawn->timeout_ms = __libxl_device_model_start_timeout() * 1000; spawn->pidpath = GCSPRINTF("%s/image/device-model-pid", dom_path); spawn->midproc_cb = libxl__spawn_record_pid; spawn->confirm_cb = device_model_confirm; @@ -3435,7 +3435,7 @@ void libxl__spawn_qdisk_backend(libxl__egc *egc, libxl__dm_spawn_state *dmss) dmss->spawn.what = GCSPRINTF("domain %u Qdisk backend", domid); dmss->spawn.xspath = GCSPRINTF("device-model/%u/state", domid); - dmss->spawn.timeout_ms = LIBXL_DEVICE_MODEL_START_TIMEOUT * 1000; + dmss->spawn.timeout_ms = __libxl_device_model_start_timeout() * 1000; /* * We cannot save Qemu pid anywhere in the xenstore guest dir, * because we will call this from unprivileged driver domains, diff --git tools/libs/light/libxl_dom_suspend.c tools/libs/light/libxl_dom_suspend.c index 6091a5f3f6..29e51f6c40 100644 --- tools/libs/light/libxl_dom_suspend.c +++ tools/libs/light/libxl_dom_suspend.c @@ -517,7 +517,7 @@ void libxl__dm_resume(libxl__egc *egc, rc = libxl__ev_time_register_rel(dmrs->ao, &dmrs->time, dm_resume_timeout, - LIBXL_DEVICE_MODEL_START_TIMEOUT * 1000); + __libxl_device_model_start_timeout() * 1000); if (rc) goto out; switch (libxl__device_model_version_running(gc, domid)) { diff --git tools/libs/light/libxl_internal.h tools/libs/light/libxl_internal.h index 803dbc1a03..684390f822 100644 --- tools/libs/light/libxl_internal.h +++ tools/libs/light/libxl_internal.h @@ -97,6 +97,12 @@ /* QEMU may be slow to load and start due to a bug in Linux where the I/O * subsystem sometime produce high latency under load. */ #define LIBXL_DEVICE_MODEL_START_TIMEOUT 60 +static inline int __libxl_device_model_start_timeout(void) +{ + const char *timeout_env = getenv("LIBXL_DEVICE_MODEL_START_TIMEOUT"); + return timeout_env ? atoi(timeout_env) + : LIBXL_DEVICE_MODEL_START_TIMEOUT; +} #define LIBXL_DEVICE_MODEL_SAVE_FILE XEN_LIB_DIR "/qemu-save" /* .$domid */ #define LIBXL_DEVICE_MODEL_RESTORE_FILE XEN_LIB_DIR "/qemu-resume" /* .$domid */ #define LIBXL_QMP_CMD_TIMEOUT 10 diff --git tools/libs/light/libxl_pci.c tools/libs/light/libxl_pci.c index 96cb4da079..7bdd9f6c3b 100644 --- tools/libs/light/libxl_pci.c +++ tools/libs/light/libxl_pci.c @@ -1157,7 +1157,7 @@ static void do_pci_add(libxl__egc *egc, pas->xswait.what = "Device Model"; pas->xswait.path = DEVICE_MODEL_XS_PATH(gc, libxl_get_stubdom_id(CTX, domid), domid, "/state"); - pas->xswait.timeout_ms = LIBXL_DEVICE_MODEL_START_TIMEOUT * 1000; + pas->xswait.timeout_ms = __libxl_device_model_start_timeout() * 1000; pas->xswait.callback = pci_add_qemu_trad_watch_state_cb; rc = libxl__xswait_start(gc, &pas->xswait); if (rc) goto out; @@ -1719,7 +1719,7 @@ static void device_pci_add_stubdom_wait(libxl__egc *egc, rc = libxl__ev_devstate_wait(ao, &pas->pciback_ds, device_pci_add_stubdom_ready, state_path, XenbusStateConnected, - LIBXL_DEVICE_MODEL_START_TIMEOUT * 1000); + __libxl_device_model_start_timeout() * 1000); if (rc) goto out; return; out: @@ -1976,7 +1976,7 @@ static void do_pci_remove(libxl__egc *egc, pci_remove_state *prs) prs->xswait.what = "Device Model"; prs->xswait.path = DEVICE_MODEL_XS_PATH(gc, libxl_get_stubdom_id(CTX, domid), domid, "/state"); - prs->xswait.timeout_ms = LIBXL_DEVICE_MODEL_START_TIMEOUT * 1000; + prs->xswait.timeout_ms = __libxl_device_model_start_timeout() * 1000; prs->xswait.callback = pci_remove_qemu_trad_watch_state_cb; rc = libxl__xswait_start(gc, &prs->xswait); if (rc) goto out_fail;