From mboxrd@z Thu Jan 1 00:00:00 1970 From: Huang, Kai Date: Thu, 10 Nov 2022 02:20:57 +0000 Subject: [PATCH 38/44] KVM: Disable CPU hotplug during hardware enabling In-Reply-To: <4f523a166badbd61a1cfb6269334e9c9354ade64.camel@intel.com> References: <20221102231911.3107438-1-seanjc@google.com> <20221102231911.3107438-39-seanjc@google.com> <4f523a166badbd61a1cfb6269334e9c9354ade64.camel@intel.com> Message-ID: List-Id: To: kvm-riscv@lists.infradead.org MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit On Thu, 2022-11-10 at 01:08 +0000, Huang, Kai wrote: > > - WARN_ON(!irqs_disabled()); > > + /* > > + * Compatibility checks are done when loading KVM and when enabling > > + * hardware, e.g. during CPU hotplug, to ensure all online CPUs are > > + * compatible, i.e. KVM should never perform a compatibility check > > on > > + * an offline CPU. > > + */ > > + WARN_ON(!irqs_disabled() && cpu_active(cpu)); > > Comment doesn't match with the code? > > "KVM should never perform a compatibility check on on offline CPU" should be > something like: > > WARN_ON(!cpu_online(cpu)); > > So, should the comment be something like below? > > "KVM compatibility check happens before CPU is marked as active". Also ignore this one as I only thought about hotplug case. 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charset="us-ascii" Content-Transfer-Encoding: 7bit Errors-To: kvmarm-bounces@lists.cs.columbia.edu Sender: kvmarm-bounces@lists.cs.columbia.edu On Thu, 2022-11-10 at 01:08 +0000, Huang, Kai wrote: > > - WARN_ON(!irqs_disabled()); > > + /* > > + * Compatibility checks are done when loading KVM and when enabling > > + * hardware, e.g. during CPU hotplug, to ensure all online CPUs are > > + * compatible, i.e. KVM should never perform a compatibility check > > on > > + * an offline CPU. > > + */ > > + WARN_ON(!irqs_disabled() && cpu_active(cpu)); > > Comment doesn't match with the code? > > "KVM should never perform a compatibility check on on offline CPU" should be > something like: > > WARN_ON(!cpu_online(cpu)); > > So, should the comment be something like below? > > "KVM compatibility check happens before CPU is marked as active". Also ignore this one as I only thought about hotplug case. _______________________________________________ kvmarm mailing list kvmarm@lists.cs.columbia.edu https://lists.cs.columbia.edu/mailman/listinfo/kvmarm From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mga06.intel.com (mga06b.intel.com [134.134.136.31]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 163F1364 for ; Thu, 10 Nov 2022 02:21:01 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1668046862; x=1699582862; h=from:to:cc:subject:date:message-id:references: in-reply-to:content-id:content-transfer-encoding: mime-version; bh=IMlYDxb2XcFMioYCtNAKqgL863k5JuepT/AfV4jdnbc=; b=R0O7LYDxTSX24ab8A0hAx7CFfq1lMqamvTq9dJ77J7RgOXP4iilIB9ee VTjXmhwECSbZM/Wa+kWpec2NM9BezljegNrp5aQ+rA6PdyFIUL4fUsncn 5HCx78g20LxunAMuHFOSfmTJdl5EdGmyr+fUBXP5Jdj418DIK3sl6l4f3 FweaZ9iYRlW0MjRxeFBCWVZhsbDfquglK37VuAD2SH3QQf7h29yx5kPSD m+Xkym4O35aBJcog8ECsJfKS0IJ5el1dVRETnu0CG6bhbV4AqlRH2Pvqk vIcR9n+fNXwMRUtHWt0EXzhO0sOTKpOoQzX38aIengVO0PZZtJbL3qSIT g==; 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Thu, 10 Nov 2022 02:20:57 +0000 Received: from BL1PR11MB5978.namprd11.prod.outlook.com ([fe80::6eb:99bf:5c45:a94b]) by BL1PR11MB5978.namprd11.prod.outlook.com ([fe80::6eb:99bf:5c45:a94b%3]) with mapi id 15.20.5791.026; Thu, 10 Nov 2022 02:20:57 +0000 From: "Huang, Kai" To: "farman@linux.ibm.com" , "frankja@linux.ibm.com" , "Christopherson,, Sean" , "mjrosato@linux.ibm.com" , "vkuznets@redhat.com" , "chenhuacai@kernel.org" , "aou@eecs.berkeley.edu" , "palmer@dabbelt.com" , "paul.walmsley@sifive.com" , "maz@kernel.org" , "anup@brainfault.org" , "imbrenda@linux.ibm.com" , "pbonzini@redhat.com" , "borntraeger@linux.ibm.com" , "aleksandar.qemu.devel@gmail.com" CC: "kvm@vger.kernel.org" , "atishp@atishpatra.org" , "farosas@linux.ibm.com" , "david@redhat.com" , "Yao, Yuan" , "mpe@ellerman.id.au" , "alexandru.elisei@arm.com" , "linux-s390@vger.kernel.org" , "linux-kernel@vger.kernel.org" , "tglx@linutronix.de" , "Yamahata, Isaku" , "kvmarm@lists.linux.dev" , "james.morse@arm.com" , "kvm-riscv@lists.infradead.org" , "suzuki.poulose@arm.com" , "linuxppc-dev@lists.ozlabs.org" , "linux-arm-kernel@lists.infradead.org" , "linux-mips@vger.kernel.org" , "Gao, Chao" , "oliver.upton@linux.dev" , "kvmarm@lists.cs.columbia.edu" , "linux-riscv@lists.infradead.org" Subject: Re: [PATCH 38/44] KVM: Disable CPU hotplug during hardware enabling Thread-Topic: [PATCH 38/44] KVM: Disable CPU hotplug during hardware enabling Thread-Index: AQHY7xJy2pUg1L4bCkib6AOkbzD9bK43Y9yAgAAUIAA= Date: Thu, 10 Nov 2022 02:20:57 +0000 Message-ID: References: <20221102231911.3107438-1-seanjc@google.com> <20221102231911.3107438-39-seanjc@google.com> <4f523a166badbd61a1cfb6269334e9c9354ade64.camel@intel.com> In-Reply-To: <4f523a166badbd61a1cfb6269334e9c9354ade64.camel@intel.com> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: user-agent: Evolution 3.44.4 (3.44.4-2.fc36) authentication-results: dkim=none (message not signed) header.d=none;dmarc=none action=none header.from=intel.com; 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charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-riscv" Errors-To: linux-riscv-bounces+linux-riscv=archiver.kernel.org@lists.infradead.org On Thu, 2022-11-10 at 01:08 +0000, Huang, Kai wrote: > > - WARN_ON(!irqs_disabled()); > > + /* > > + * Compatibility checks are done when loading KVM and when enabling > > + * hardware, e.g. during CPU hotplug, to ensure all online CPUs are > > + * compatible, i.e. KVM should never perform a compatibility check > > on > > + * an offline CPU. > > + */ > > + WARN_ON(!irqs_disabled() && cpu_active(cpu)); > > Comment doesn't match with the code? > > "KVM should never perform a compatibility check on on offline CPU" should be > something like: > > WARN_ON(!cpu_online(cpu)); > > So, should the comment be something like below? > > "KVM compatibility check happens before CPU is marked as active". Also ignore this one as I only thought about hotplug case. _______________________________________________ linux-riscv mailing list linux-riscv@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-riscv 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.ozlabs.org (lists.ozlabs.org [112.213.38.117]) (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 4C4B9C4332F for ; Thu, 10 Nov 2022 02:22:12 +0000 (UTC) Received: from boromir.ozlabs.org (localhost [IPv6:::1]) by lists.ozlabs.org (Postfix) with ESMTP id 4N75FZ2PHBz3dtm for ; Thu, 10 Nov 2022 13:22:10 +1100 (AEDT) Authentication-Results: lists.ozlabs.org; dkim=fail reason="signature verification failed" (2048-bit key; unprotected) header.d=intel.com header.i=@intel.com header.a=rsa-sha256 header.s=Intel header.b=FVoJjJmH; 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charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On Thu, 2022-11-10 at 01:08 +0000, Huang, Kai wrote: > > - WARN_ON(!irqs_disabled()); > > + /* > > + * Compatibility checks are done when loading KVM and when enabling > > + * hardware, e.g. during CPU hotplug, to ensure all online CPUs are > > + * compatible, i.e. KVM should never perform a compatibility check > > on > > + * an offline CPU. > > + */ > > + WARN_ON(!irqs_disabled() && cpu_active(cpu)); > > Comment doesn't match with the code? > > "KVM should never perform a compatibility check on on offline CPU" should be > something like: > > WARN_ON(!cpu_online(cpu)); > > So, should the comment be something like below? > > "KVM compatibility check happens before CPU is marked as active". Also ignore this one as I only thought about hotplug case. _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel