From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id B8407C02180 for ; Thu, 16 Jan 2025 08:36:38 +0000 (UTC) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1tYLL5-00083p-FE; Thu, 16 Jan 2025 03:34:55 -0500 Received: from eggs.gnu.org ([2001:470:142:3::10]) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1tYLL2-0007ww-68 for qemu-devel@nongnu.org; Thu, 16 Jan 2025 03:34:52 -0500 Received: from casper.infradead.org ([2001:8b0:10b:1236::1]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1tYLKn-0005Ys-O0 for qemu-devel@nongnu.org; Thu, 16 Jan 2025 03:34:43 -0500 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=casper.20170209; h=MIME-Version:Content-Type:References: In-Reply-To:Date:Cc:To:From:Subject:Message-ID:Sender:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description; bh=hZXgQm7xHfFb1lDghDtg1VLG4GmWY4ObxhD/qX/E+mU=; b=wESqLW0hl2FgMde3LWWhxFPtEP K8k7jo1sZD3OZCvVN84VCMR/+oDiPXrWr/Z058Mb51SrU7gnMlYGoDj/3pm/uNU1/OcEEZqAW1IYb 74s8WcCmJeg3Kgu2cfyeP4G7fo3HE8Nv71H6ZJUCIoVTX7fO99z9W06hJ/UvOBYlURrL45fcO7yU7 cDymjavByUopEBNa6BpKR5IDLCiP2kpDkAe7B1eFyUlQnu/HdUt/mIoY5eu9593+mD4eswksqjiQW HXTxpfZ7luzE6zDGro1U0fCfFu9cnzI5WurFG4jhF/SsPciPC1WnKzG7uA2VP5JDPDvAVyuw2RPrz p6nYqW+A==; Received: from 54-240-197-234.amazon.com ([54.240.197.234] helo=u09cd745991455d.ant.amazon.com) by casper.infradead.org with esmtpsa (Exim 4.98 #2 (Red Hat Linux)) id 1tYLKd-0000000AdFx-0beU; Thu, 16 Jan 2025 08:34:27 +0000 Message-ID: <96e9b9f98fc6800728bc524646f73ac31a0ddf71.camel@infradead.org> Subject: Re: [PATCH] system/runstate: Fix regression, clarify BQL status of exit notifiers From: David Woodhouse To: Phil Dennis-Jordan , Paolo Bonzini Cc: qemu-devel@nongnu.org, philmd@linaro.org, akihiko.odaki@daynix.com Date: Thu, 16 Jan 2025 09:34:26 +0100 In-Reply-To: References: <20250112212609.17996-1-phil@philjordan.eu> <8dff3836-1c96-4ae8-a9d8-f86f97d78986@redhat.com> Content-Type: multipart/signed; micalg="sha-256"; protocol="application/pkcs7-signature"; boundary="=-ILzlOuB7h/DKhN5hRz2+" User-Agent: Evolution 3.52.3-0ubuntu1 MIME-Version: 1.0 X-SRS-Rewrite: SMTP reverse-path rewritten from by casper.infradead.org. See http://www.infradead.org/rpr.html Received-SPF: none client-ip=2001:8b0:10b:1236::1; envelope-from=BATV+cabf69696ff47aa9dee2+7816+infradead.org+dwmw2@casper.srs.infradead.org; helo=casper.infradead.org X-Spam_score_int: -43 X-Spam_score: -4.4 X-Spam_bar: ---- X-Spam_report: (-4.4 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_MED=-2.3, SPF_HELO_NONE=0.001, SPF_NONE=0.001 autolearn=ham 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+qemu-devel=archiver.kernel.org@nongnu.org Sender: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org --=-ILzlOuB7h/DKhN5hRz2+ Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Wed, 2025-01-15 at 20:17 +0100, Phil Dennis-Jordan wrote: >=20 > BQL_LOCK_GUARD expands to a call to bql_auto_lock(), which in turn > defends against recursive locking by checking bql_locked().=C2=A0 >=20 > https://gitlab.com/qemu-project/qemu/-/blob/master/include/qemu/main-loop= .h#L377 >=20 > I think that should make it safe? Looks like it. I did this to test: --- a/hw/i386/kvm/xen_evtchn.c +++ b/hw/i386/kvm/xen_evtchn.c @@ -451,6 +451,10 @@ void xen_evtchn_set_callback_level(int level) if (level && !s->extern_gsi_level) { kvm_xen_set_callback_asserted(); } + if (level) { + printf("Exiting, BQL held\n"); + exit(77); + } } } =20 --- a/system/runstate.c +++ b/system/runstate.c @@ -851,6 +851,7 @@ void qemu_remove_exit_notifier(Notifier *notify) static void qemu_run_exit_notifiers(void) { BQL_LOCK_GUARD(); + printf("%s has BQL\n", __func__); notifier_list_notify(&exit_notifiers, NULL); } =20 So the first time a Xen guest's callback IRQ is asserted, it exited with the BQL held, and qemu_run_exit_notifiers() didn't get stuck. [ 0.521568] ACPI: \_SB_.GSIF: Enabled at IRQ 21 Exiting, BQL held qemu_run_exit_notifiers has BQL The actual cleanup of the XenDevice did then deadlock on the Xen evtchn port_lock, which had *also* been held when my hack exited in the evtchn code. But that one is expected. #0 0x00007fc5b2a7b0c0 in __lll_lock_wait () at /lib64/libc.so.6 #1 0x00007fc5b2a81d81 in pthread_mutex_lock@@GLIBC_2.2.5 () at /lib64/libc.so.6 #2 0x0000558286c07a63 in qemu_mutex_lock_impl (mutex=3D0x558294179998, file=3D0x558286f9b905 "../hw/i386/kvm/xen_evtc= hn.c", line=3D2147) at ../util/qemu-thread-posix.c:95 #3 0x00005582868d774f in xen_be_evtchn_unbind (xc=3D0x5582939b3810, port= =3D2) at ../hw/i386/kvm/xen_evtchn.c:2147 #4 0x000055828679e0a9 in qemu_xen_evtchn_unbind (xc=3D, port=3D) at /home/dwmw2/git/qemu/include/hw/xen/xen_backend_ops.h:91 #5 xen_device_unbind_event_channel (xendev=3D, channel=3D0x5582939b4cb0, errp=3D0x0) at ../hw/xen/xen-bus.c:961 #6 0x00005582865f64b9 in xen_console_disconnect (xendev=3Dxendev@entry=3D0x5582942df4a0, errp=3Derrp@entry=3D0x0) at ../hw/char/xen_console.c:298 #7 0x00005582865f6673 in xen_console_unrealize (xendev=3D0x5582942df4a0) at ../hw/char/xen_console.c:411 #8 0x000055828679e201 in xen_device_unrealize (dev=3D) at ../hw/xen/xen-bus.c:988 #9 0x0000558286c0da5f in notifier_list_notify (list=3D, dat= a=3D0x0) at ../util/notify.c:39 #10 0x00007fc5b2a2a461 in __run_exit_handlers () at /lib64/libc.so.6 #11 0x00007fc5b2a2a52e in exit () at /lib64/libc.so.6 #12 0x00005582868d86dd in xen_evtchn_set_callback_level (level=3D1) at ../hw/i386/kvm/xen_evtchn.c:456 #13 0x00005582868d7c74 in inject_callback (s=3D0x558294179650, vcpu=3D) at ../hw/i386/kvm/xen_evtc= hn.c:548 #14 do_set_port_compat (s=3D, port=3D, shinfo=3D,= vcpu_info=3D) at ../hw/i386/kvm/xen_evtchn.c:921 #15 set_port_pending (s=3Ds@entry=3D0x558294179650, port=3D) at ../hw/i386/kvm/xen_evtchn.c:963 --=-ILzlOuB7h/DKhN5hRz2+ Content-Type: application/pkcs7-signature; name="smime.p7s" Content-Disposition: attachment; filename="smime.p7s" Content-Transfer-Encoding: base64 MIAGCSqGSIb3DQEHAqCAMIACAQExDzANBglghkgBZQMEAgEFADCABgkqhkiG9w0BBwEAAKCCD9Aw ggSOMIIDdqADAgECAhAOmiw0ECVD4cWj5DqVrT9PMA0GCSqGSIb3DQEBCwUAMGUxCzAJBgNVBAYT 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