From nobody Sun May 5 02:52:14 2024 Delivered-To: importer@patchew.org Received-SPF: pass (zohomail.com: domain of lists.xenproject.org designates 192.237.175.120 as permitted sender) client-ip=192.237.175.120; envelope-from=xen-devel-bounces@lists.xenproject.org; helo=lists.xenproject.org; Authentication-Results: mx.zohomail.com; dkim=fail; spf=pass (zohomail.com: domain of lists.xenproject.org designates 192.237.175.120 as permitted sender) smtp.mailfrom=xen-devel-bounces@lists.xenproject.org ARC-Seal: i=1; a=rsa-sha256; t=1611680550; cv=none; d=zohomail.com; s=zohoarc; b=Q7cQyCidffQabEW04UcdJ38uQR4CfrjTn7FooQEoLGtLTS/7Aj9hwYvY6msox8Ix1c5HKEfWrKMS+ofet0dGes0Qm294T/KJzCyve1TnEu+FWlsy0MXKRYg6cBjYO5YbxecpGops0lxr1Yv7n6px1Q5kY3H4uE7PaynFetT2OD0= ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=zohomail.com; s=zohoarc; t=1611680550; h=Content-Type:Cc:Date:From:In-Reply-To:List-Subscribe:List-Post:List-Id:List-Help:List-Unsubscribe:MIME-Version:Message-ID:References:Sender:Subject:To; bh=CBo81UQNuCDmAB+DUPniDCu0YPbadaqTfR98DpDqSPU=; b=iLReozi2qghI6iF6r82EywqUlEhtrnhP03BYeQvNLtGIPE4537jfyKUDXuINQjPFzfz0N4bkJdylao4QBNkvVV91DMUc+mtHE+/TwkiVzbEhn2O/Q/OU+DFnp5U5IaAy1JBT5cURVYNSHnY6s7gD0vnOHT9rnDX03AomErZMFfs= ARC-Authentication-Results: i=1; mx.zohomail.com; dkim=fail; spf=pass (zohomail.com: domain of lists.xenproject.org designates 192.237.175.120 as permitted sender) smtp.mailfrom=xen-devel-bounces@lists.xenproject.org Return-Path: Received: from lists.xenproject.org (lists.xenproject.org [192.237.175.120]) by mx.zohomail.com with SMTPS id 1611680550797497.15580808999493; Tue, 26 Jan 2021 09:02:30 -0800 (PST) Received: from list by lists.xenproject.org with outflank-mailman.75338.135620 (Exim 4.92) (envelope-from ) id 1l4RjF-0000h8-19; Tue, 26 Jan 2021 17:02:09 +0000 Received: by outflank-mailman (output) from mailman id 75338.135620; Tue, 26 Jan 2021 17:02:08 +0000 Received: from localhost ([127.0.0.1] helo=lists.xenproject.org) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1l4RjE-0000h1-U9; Tue, 26 Jan 2021 17:02:08 +0000 Received: by outflank-mailman (input) for mailman id 75338; Tue, 26 Jan 2021 17:02:07 +0000 Received: from us1-rack-iad1.inumbo.com ([172.99.69.81]) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1l4RjD-0000gv-2K for xen-devel@lists.xenproject.org; Tue, 26 Jan 2021 17:02:07 +0000 Received: from merlin.infradead.org (unknown [2001:8b0:10b:1231::1]) by us1-rack-iad1.inumbo.com (Halon) with ESMTPS id 793ff46c-a469-406d-ba6c-3c87fc737170; Tue, 26 Jan 2021 17:02:01 +0000 (UTC) Received: from 54-240-197-239.amazon.com ([54.240.197.239] helo=u3832b3a9db3152.ant.amazon.com) by merlin.infradead.org with esmtpsa (Exim 4.92.3 #3 (Red Hat Linux)) id 1l4Rix-0005eU-Jc; Tue, 26 Jan 2021 17:01:51 +0000 X-Outflank-Mailman: Message body and most headers restored to incoming version 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: 793ff46c-a469-406d-ba6c-3c87fc737170 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=merlin.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=CBo81UQNuCDmAB+DUPniDCu0YPbadaqTfR98DpDqSPU=; b=mA8PNUznueESrK+/K/ID3i3Fd1 LyGm2BgOmJMKREM+Rtenc9mngva5h/DXlfdwkvXX+DfQb9dOsjQ4kn5zMKI3lGB3DR7/ZR5veB6a0 DYuHMfWdUybCVLjDfjZpTmsUDg4E1O09zVg8YhShbSjcfUXdaN1FvC/y7vNxefGdL96Q2AgVP9Prt CjG77yXjOqZpf7lSKZiqSHIQLXbWjmuhDCtEVuWFQAoixMFiwDNuKt5f+nfmb32HgXsF0VPtKTEAk Zi7f5A3QQYe1lSBVxSERMDu/82EKLHCxbx9Mk4gUpDUXJBrjLeKB0gaNOTg4K8wvUby8xdH85Bmti InI3UzzA==; Message-ID: <4c9af052a6e0f6485d1de43f2c38b1461996db99.camel@infradead.org> Subject: [PATCH] xen: Fix XenStore initialisation for XS_LOCAL From: David Woodhouse To: =?ISO-8859-1?Q?J=FCrgen_Gro=DF?= , x86@kernel.org Cc: Stefano Stabellini , Boris Ostrovsky , Paul Durrant , jgrall@amazon.com, karahmed@amazon.de, xen-devel Date: Tue, 26 Jan 2021 17:01:49 +0000 In-Reply-To: <4d334457-e173-fa21-40f0-65f800a00cec@suse.com> References: <20210113132606.422794-1-dwmw2@infradead.org> <4d334457-e173-fa21-40f0-65f800a00cec@suse.com> Content-Type: multipart/signed; micalg="sha-256"; protocol="application/x-pkcs7-signature"; boundary="=-XalUlSc7InwHfIE55Wvq" X-Mailer: Evolution 3.28.5-0ubuntu0.18.04.2 Mime-Version: 1.0 X-SRS-Rewrite: SMTP reverse-path rewritten from by merlin.infradead.org. See http://www.infradead.org/rpr.html X-Zoho-Virus-Status: 1 X-ZohoMail-DKIM: fail (Header signature does not verify) --=-XalUlSc7InwHfIE55Wvq Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" From: David Woodhouse In commit 3499ba8198ca ("xen: Fix event channel callback via INTX/GSI") I reworked the triggering of xenbus_probe(). I tried to simplify things by taking out the workqueue based startup triggered from wake_waiting(); the somewhat poorly named xenbus IRQ handler. I missed the fact that in the XS_LOCAL case (Dom0 starting its own xenstored or xenstore-stubdom, which happens after the kernel is booted completely), that IRQ-based trigger is still actually needed. So... put it back, except more cleanly. By just spawning a xenbus_probe thread which waits on xb_waitq and runs the probe the first time it gets woken, just as the workqueue-based hack did. This is actually a nicer approach for *all* the back ends with different interrupt methods, and we can switch them all over to that without the complex conditions for when to trigger it. But not in -rc6. This is the minimal fix for the regression, although it's a step in the right direction instead of doing a partial revert and actually putting the workqueue back. It's also simpler than the workqueue. Fixes: 3499ba8198ca ("xen: Fix event channel callback via INTX/GSI") Signed-off-by: David Woodhouse --- drivers/xen/xenbus/xenbus_probe.c | 31 +++++++++++++++++++++++++++++++ 1 file changed, 31 insertions(+) diff --git a/drivers/xen/xenbus/xenbus_probe.c b/drivers/xen/xenbus/xenbus_= probe.c index c8f0282bb649..18ffd0551b54 100644 --- a/drivers/xen/xenbus/xenbus_probe.c +++ b/drivers/xen/xenbus/xenbus_probe.c @@ -714,6 +714,23 @@ static bool xs_hvm_defer_init_for_callback(void) #endif } =20 +static int xenbus_probe_thread(void *unused) +{ + DEFINE_WAIT(w); + + /* + * We actually just want to wait for *any* trigger of xb_waitq, + * and run xenbus_probe() the moment it occurs. + */ + prepare_to_wait(&xb_waitq, &w, TASK_INTERRUPTIBLE); + schedule(); + finish_wait(&xb_waitq, &w); + + DPRINTK("probing"); + xenbus_probe(); + return 0; +} + static int __init xenbus_probe_initcall(void) { /* @@ -725,6 +742,20 @@ static int __init xenbus_probe_initcall(void) !xs_hvm_defer_init_for_callback())) xenbus_probe(); =20 + /* + * For XS_LOCAL, spawn a thread which will wait for xenstored + * or a xenstore-stubdom to be started, then probe. It will be + * triggered when communication starts happening, by waiting + * on xb_waitq. + */ + if (xen_store_domain_type =3D=3D XS_LOCAL) { + struct task_struct *probe_task; + + probe_task =3D kthread_run(xenbus_probe_thread, NULL, + "xenbus_probe"); + if (IS_ERR(probe_task)) + return PTR_ERR(probe_task); + } return 0; } device_initcall(xenbus_probe_initcall); --=20 2.29.2 --=-XalUlSc7InwHfIE55Wvq Content-Type: application/x-pkcs7-signature; name="smime.p7s" Content-Disposition: attachment; filename="smime.p7s" Content-Transfer-Encoding: base64 MIAGCSqGSIb3DQEHAqCAMIACAQExDzANBglghkgBZQMEAgEFADCABgkqhkiG9w0BBwEAAKCCECow ggUcMIIEBKADAgECAhEA4rtJSHkq7AnpxKUY8ZlYZjANBgkqhkiG9w0BAQsFADCBlzELMAkGA1UE BhMCR0IxGzAZBgNVBAgTEkdyZWF0ZXIgTWFuY2hlc3RlcjEQMA4GA1UEBxMHU2FsZm9yZDEaMBgG A1UEChMRQ09NT0RPIENBIExpbWl0ZWQxPTA7BgNVBAMTNENPTU9ETyBSU0EgQ2xpZW50IEF1dGhl bnRpY2F0aW9uIGFuZCBTZWN1cmUgRW1haWwgQ0EwHhcNMTkwMTAyMDAwMDAwWhcNMjIwMTAxMjM1 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