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 D7F07C3ABB2 for ; Wed, 28 May 2025 08:08:29 +0000 (UTC) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1uKBpB-0005z4-91; Wed, 28 May 2025 04:07:45 -0400 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 1uKBp9-0005yo-6Y; Wed, 28 May 2025 04:07:43 -0400 Received: from sea.source.kernel.org ([172.234.252.31]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1uKBp7-00048D-C7; Wed, 28 May 2025 04:07:42 -0400 Received: from smtp.kernel.org (transwarp.subspace.kernel.org [100.75.92.58]) by sea.source.kernel.org (Postfix) with ESMTP id 8B7AD44F79; Wed, 28 May 2025 08:07:32 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 67F82C4CEEB; Wed, 28 May 2025 08:07:32 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1748419652; bh=lL96uDmlxorkqCSPKcwt7fdcPUDrw1BOfhLShmQS6oA=; h=Date:From:To:Cc:Subject:In-Reply-To:References:From; b=URjBfAchO6Ueql3RD0Gr8cZH01tpFB1qTxgdNuOPQ8FBvieY3sApnwssWgYpxwOiE Bd8w0pOnqlX/6ZA91aqtDawHMskuA/5Z/YVA2WoeDy+iceY9TRh2AbVoG6BnwXStbk 8P4N1X6Gt1P59gdLfnoqzOzGSM85Gpi5gRCkrowjmTw4fB3CknuWKQ50Xivz/MshTh d/stvpMNzgIkGp9raw12RqPCOqGIDcSyG0tSHrNLZ9D4ZZ5xxyZ6nNYJeYHWlc+lsb xhGHJysK71AvpHZIPbpictYSwsyRcXXOlo2KvpNDMKVkpgRsa+WjSzGPEL6iv+UVN9 EDjoCV9TjuotA== Received: from sofa.misterjones.org ([185.219.108.64] helo=goblin-girl.misterjones.org) by disco-boy.misterjones.org with esmtpsa (TLS1.3) tls TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 (Exim 4.95) (envelope-from ) id 1uKBov-001Ass-T2; Wed, 28 May 2025 09:07:30 +0100 Date: Wed, 28 May 2025 09:07:29 +0100 Message-ID: <86ecw9dupq.wl-maz@kernel.org> From: Marc Zyngier To: Miguel Luis Cc: Eric Auger , "eric.auger.pro@gmail.com" , "qemu-devel@nongnu.org" , "qemu-arm@nongnu.org" , "peter.maydell@linaro.org" , "richard.henderson@linaro.org" , "gkulkarni@amperecomputing.com" , "gankulkarni@os.amperecomputing.com" Subject: Re: [PATCH v5 0/5] ARM Nested Virt Support In-Reply-To: References: <20250527062534.1186004-1-eric.auger@redhat.com> <86msayec3a.wl-maz@kernel.org> <63FE2592-DF4D-4CCF-BC76-D8656C9EFA0A@oracle.com> <86jz62dzxa.wl-maz@kernel.org> <86iklmdv4d.wl-maz@kernel.org> <86frgqdmhy.wl-maz@kernel.org> User-Agent: Wanderlust/2.15.9 (Almost Unreal) SEMI-EPG/1.14.7 (Harue) FLIM-LB/1.14.9 (=?UTF-8?B?R29qxY0=?=) APEL-LB/10.8 EasyPG/1.0.0 Emacs/30.1 (aarch64-unknown-linux-gnu) MULE/6.0 (HANACHIRUSATO) MIME-Version: 1.0 (generated by SEMI-EPG 1.14.7 - "Harue") Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable X-SA-Exim-Connect-IP: 185.219.108.64 X-SA-Exim-Rcpt-To: miguel.luis@oracle.com, eric.auger@redhat.com, eric.auger.pro@gmail.com, qemu-devel@nongnu.org, qemu-arm@nongnu.org, peter.maydell@linaro.org, richard.henderson@linaro.org, gkulkarni@amperecomputing.com, gankulkarni@os.amperecomputing.com X-SA-Exim-Mail-From: maz@kernel.org X-SA-Exim-Scanned: No (on disco-boy.misterjones.org); SAEximRunCond expanded to false Received-SPF: pass client-ip=172.234.252.31; envelope-from=maz@kernel.org; helo=sea.source.kernel.org X-Spam_score_int: -30 X-Spam_score: -3.1 X-Spam_bar: --- X-Spam_report: (-3.1 / 5.0 requ) DKIMWL_WL_HIGH=-2.907, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_VALIDITY_CERTIFIED_BLOCKED=0.001, RCVD_IN_VALIDITY_RPBL_BLOCKED=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 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+qemu-devel=archiver.kernel.org@nongnu.org Sender: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org On Wed, 28 May 2025 00:52:40 +0100, Miguel Luis wrote: >=20 >=20 >=20 > > On 27 May 2025, at 16:52, Marc Zyngier wrote: > >=20 > > On Tue, 27 May 2025 16:55:32 +0100, > > Miguel Luis wrote: > >>=20 >> Result on the guest: Splat at early_kvm_mode_cfg, boot proceeds, ends u= p in hard lockup splat. > >=20 > > I don't see any of these lockups with kvmtool. See this: > >=20 > > https://pastebin.com/uyYzsBHc >=20 > Could you try bigger values for -c and check whether you can reproduce th= e issue? How about 512, which is the maximum we support, and works for me with an oversubscribing ratio of 42:1? More importantly, how about *you* analyse the issue and report something that is actually actionable? > I=E2=80=99m now suspecting the lockups might have a different reason than= guest=E2=80=99s mode. I'm shocked! :) M. --=20 Without deviation from the norm, progress is not possible.