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mx.microsoft.com 1; spf=pass smtp.mailfrom=arm.com; dmarc=pass action=none header.from=arm.com; dkim=pass header.d=arm.com; arc=none DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=armh.onmicrosoft.com; s=selector2-armh-onmicrosoft-com; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-SenderADCheck; bh=2gJMI/JRdY9brm2ekNNIX6nBtQno/t7ociY5F+FOE74=; b=ybuih+Hr/Z4LsScleHoQl6A/bs6B+DaifU6oVAl+y7s/4jItk1c9pulTT0FaK3z8D3MeWjE7NRvc2KiMcbV74y4GtI/F8naPvFNvKroJjqIyOXYg+Fn53qDJyC9c5LuhUgBOJHZprHn72xX/TyX1q19GBb2nEk3RjWhmGlWWLS0= Authentication-Results-Original: gmail.com; dkim=none (message not signed) header.d=none;gmail.com; dmarc=none action=none header.from=arm.com; Content-Type: text/plain; charset=utf-8 Subject: Re: xen/evtchn: Dom0 boot hangs using preempt_rt kernel 5.10 From: Luca Fancellu In-Reply-To: <565C6475-4693-4A7C-8316-9613146300C2@arm.com> Date: Tue, 23 Mar 2021 17:06:43 +0000 Cc: "xen-devel@lists.xenproject.org" , =?utf-8?B?SsO8cmdlbiBHcm/Dnw==?= Content-Transfer-Encoding: quoted-printable Message-Id: <2A09774F-ADDF-41B0-8E72-DC0FA0A6B1F3@arm.com> References: <1FAD6C91-2B3A-48F0-88D7-CFCFC8B53BA9@arm.com> <2BC82A95-DFB9-4F90-8CC6-AE39405157ED@arm.com> <565C6475-4693-4A7C-8316-9613146300C2@arm.com> To: Jason Andryuk X-Mailer: Apple Mail (2.3654.60.0.2.21) X-Originating-IP: [82.8.129.65] X-ClientProxiedBy: LO2P265CA0229.GBRP265.PROD.OUTLOOK.COM (2603:10a6:600:b::25) To VI1PR08MB3629.eurprd08.prod.outlook.com (2603:10a6:803:7f::25) MIME-Version: 1.0 X-MS-Exchange-MessageSentRepresentingType: 1 X-MS-PublicTrafficType: Email X-MS-Office365-Filtering-HT: Tenant X-MS-Office365-Filtering-Correlation-Id: d18b5f3a-696c-4385-a543-08d8ee1e1551 X-MS-TrafficTypeDiagnostic: VE1PR08MB4688:|AM9PR08MB6194: X-Microsoft-Antispam-PRVS: x-checkrecipientrouted: true NoDisclaimer: true X-MS-Oob-TLC-OOBClassifiers: OLM:10000;OLM:10000; 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X-OriginatorOrg: arm.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 23 Mar 2021 17:07:04.6947 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: d18b5f3a-696c-4385-a543-08d8ee1e1551 X-MS-Exchange-CrossTenant-Id: f34e5979-57d9-4aaa-ad4d-b122a662184d X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=f34e5979-57d9-4aaa-ad4d-b122a662184d;Ip=[63.35.35.123];Helo=[64aa7808-outbound-1.mta.getcheckrecipient.com] X-MS-Exchange-CrossTenant-AuthSource: DB5EUR03FT006.eop-EUR03.prod.protection.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: AM9PR08MB6194 Hi all, I have an update, changing the lock introduced by the serie from spinlock_t= to raw_spinlock_t, changing the lock/unlock function to use the raw_* vers= ion and keeping the BUG_ON(=E2=80=A6) (now we can because raw_* implementat= ion disable interrupts on preempt_rt) the kernel is booting correctly. So seems that the BUG_ON(=E2=80=A6) is needed and the unmask function shoul= d run with interrupt disabled, anyone knows why this change worked?=20 > On 23 Mar 2021, at 15:39, Luca Fancellu wrote: >=20 > Hi Jason, >=20 > Thanks for your hints, unfortunately seems not an init problem because in= the same init configuration I tried the 5.10.23 (preempt_rt) without the J= uergen patch but with the BUG_ON removed and it boots without problem. So s= eems that applying the serie does something (on a preempt_rt kernel) and we= are trying to figure out what. >=20 >=20 >> On 23 Mar 2021, at 12:36, Jason Andryuk wrote: >>=20 >> On Mon, Mar 22, 2021 at 3:09 PM Luca Fancellu wr= ote: >>>=20 >>> Hi Juergen, >>>=20 >>> Yes you are right it was my mistake, as you said to remove the BUG_ON(= =E2=80=A6) this serie (https://patchwork.kernel.org/project/xen-devel/cover= /20210306161833.4552-1-jgross@suse.com/) is needed, since I=E2=80=99m using= yocto I=E2=80=99m able to build a preempt_rt kernel up to the 5.10.23 and = for this reason I=E2=80=99m applying that serie on top of this version, the= n I=E2=80=99m removing the BUG_ON(=E2=80=A6). >>>=20 >>> A thing that was not expected is that now the Dom0 kernel is stuck on = =E2=80=9CSetting domain 0 name, domid and JSON config=E2=80=A6=E2=80=9D ste= p and the system seems unresponsive. Seems like a deadlock issue but lookin= g into the serie we can=E2=80=99t spot anything and that serie was also tes= ted by others from the community. >>> Do you have any idea on that? >>=20 >> I think this can happen if xenstored isn't running. Client access to >> xenstore blocks until xenstored becomes available. So check your init >> scripts ordering. >>=20 >> Regards, >> Jason >=20 > Cheers, > Luca Cheers, Luca=