From patchwork Wed Nov 30 23:08:48 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Sean Christopherson X-Patchwork-Id: 13060563 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 vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 5260BC47088 for ; Wed, 30 Nov 2022 23:10:03 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229616AbiK3XKC (ORCPT ); Wed, 30 Nov 2022 18:10:02 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:46190 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229745AbiK3XJp (ORCPT ); Wed, 30 Nov 2022 18:09:45 -0500 Received: from mail-pf1-x44a.google.com (mail-pf1-x44a.google.com [IPv6:2607:f8b0:4864:20::44a]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id AC4BF83E8F for ; Wed, 30 Nov 2022 15:09:44 -0800 (PST) Received: by mail-pf1-x44a.google.com with SMTP id 67-20020a621946000000b00575f8210320so181737pfz.10 for ; Wed, 30 Nov 2022 15:09:44 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20210112; h=cc:to:from:subject:message-id:references:mime-version:in-reply-to :date:reply-to:from:to:cc:subject:date:message-id:reply-to; bh=E8JVGgtDpa1adQbcFKdjF0h5x+zc5eW3OzNDv17W+I0=; b=DS5tl3JZt5ENZ41z8LWoU7l/LLAZg0bKxr9NB64mArQBR7Z4xQ54gwA8E1Foi7ucUI WLpYLHet6DIopxUbH10y1vLmghI4adUhheVz2l+sfpolKRTogMb2+JXMX5kC+1I07F/z xq02cwtlNoKx8xWnfdsY/DFfLTDmRaQZCHvCCDtocOPTXWGXE+6cy/K/TTmkXZECJ1T5 UPbbMU++Q0JdnDp6PdsJU4We1R6snVfDObMmpUXwD7SotdnLb3fRUaZHvapd0uWqxFq9 B+vmtfzyaE3KTk8T/zN+WUL7QMUukMAgZHVrZIfnA64+0ySQ/W2zwvQkWpKfKL7fFmQx zvng== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=cc:to:from:subject:message-id:references:mime-version:in-reply-to :date:reply-to:x-gm-message-state:from:to:cc:subject:date:message-id :reply-to; bh=E8JVGgtDpa1adQbcFKdjF0h5x+zc5eW3OzNDv17W+I0=; b=A9zxh77JmsgMEeZDPh4X7KLT2P0q/PedQnqMQc+QiEq/ZLc3IaaIvvPfJMUBxmMjE6 1aJSrgU9UgJ/KZmrevyMlRL1y0kBtNdSqGGKmX8JkycAR5dYGInhfpOtk2VgIVIJ6XRU dxb9JO8Z+j3GAG+2z2FbbYrn7ydB5gTpW1djBQQQqBqFqL325+vVHrIVohFOQ8iar5m/ 9DihdKvL8erAJpaoKmJFLM8vhqwvLPZQADDEctr1Q+d8MBNRAdTzD7FD7NwgGCSCh0IE o1gD0kiNPW4MA/TuHxD2oWYzZS/Dg4IJXW8kIqf6Jmv8/Y9owDalpPjaTHffjFQBiDy5 3W9g== X-Gm-Message-State: ANoB5plU4tf35eG5SmYwTXcXQrTW75Ga5RZip7qk8g3wL0+ec6JJu5s4 BShUfeGMXGstvJgy6C1+umIGhXfo8uU= X-Google-Smtp-Source: AA0mqf6Q0BFR2rWNLKbL3PfSbJ45azh4M9K0FqaT09LmFusT3iMI987lBa2MWHLHJI40i8Y0hHfQV/M7a6M= X-Received: from zagreus.c.googlers.com ([fda3:e722:ac3:cc00:7f:e700:c0a8:5c37]) (user=seanjc job=sendgmr) by 2002:a17:902:e887:b0:189:1fcf:6ceb with SMTP id w7-20020a170902e88700b001891fcf6cebmr43466277plg.45.1669849784316; Wed, 30 Nov 2022 15:09:44 -0800 (PST) Reply-To: Sean Christopherson Date: Wed, 30 Nov 2022 23:08:48 +0000 In-Reply-To: <20221130230934.1014142-1-seanjc@google.com> Mime-Version: 1.0 References: <20221130230934.1014142-1-seanjc@google.com> X-Mailer: git-send-email 2.38.1.584.g0f3c55d4c2-goog Message-ID: <20221130230934.1014142-5-seanjc@google.com> Subject: [PATCH v2 04/50] KVM: Teardown VFIO ops earlier in kvm_exit() From: Sean Christopherson To: Paolo Bonzini , Marc Zyngier , Huacai Chen , Aleksandar Markovic , Anup Patel , Paul Walmsley , Palmer Dabbelt , Albert Ou , Christian Borntraeger , Janosch Frank , Claudio Imbrenda , Matthew Rosato , Eric Farman , Sean Christopherson , Vitaly Kuznetsov , David Woodhouse , Paul Durrant Cc: James Morse , Alexandru Elisei , Suzuki K Poulose , Oliver Upton , Atish Patra , David Hildenbrand , kvm@vger.kernel.org, linux-arm-kernel@lists.infradead.org, kvmarm@lists.linux.dev, kvmarm@lists.cs.columbia.edu, linux-mips@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, kvm-riscv@lists.infradead.org, linux-riscv@lists.infradead.org, linux-s390@vger.kernel.org, linux-kernel@vger.kernel.org, Yuan Yao , Cornelia Huck , Isaku Yamahata , " =?utf-8?q?Philippe_Mathieu-Daud=C3=A9?= " , Fabiano Rosas , Michael Ellerman , Kai Huang , Chao Gao , Thomas Gleixner Precedence: bulk List-ID: X-Mailing-List: linux-mips@vger.kernel.org Move the call to kvm_vfio_ops_exit() further up kvm_exit() to try and bring some amount of symmetry to the setup order in kvm_init(), and more importantly so that the arch hooks are invoked dead last by kvm_exit(). This will allow arch code to move away from the arch hooks without any change in ordering between arch code and common code in kvm_exit(). That kvm_vfio_ops_exit() is called last appears to be 100% arbitrary. It was bolted on after the fact by commit 571ee1b68598 ("kvm: vfio: fix unregister kvm_device_ops of vfio"). The nullified kvm_device_ops_table is also local to kvm_main.c and is used only when there are active VMs, so unless arch code is doing something truly bizarre, nullifying the table earlier in kvm_exit() is little more than a nop. Signed-off-by: Sean Christopherson Reviewed-by: Cornelia Huck Reviewed-by: Eric Farman --- virt/kvm/kvm_main.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c index ded88ad6c2d8..988f7d92db2e 100644 --- a/virt/kvm/kvm_main.c +++ b/virt/kvm/kvm_main.c @@ -5980,6 +5980,7 @@ void kvm_exit(void) for_each_possible_cpu(cpu) free_cpumask_var(per_cpu(cpu_kick_mask, cpu)); kmem_cache_destroy(kvm_vcpu_cache); + kvm_vfio_ops_exit(); kvm_async_pf_deinit(); unregister_syscore_ops(&kvm_syscore_ops); unregister_reboot_notifier(&kvm_reboot_notifier); @@ -5989,7 +5990,6 @@ void kvm_exit(void) free_cpumask_var(cpus_hardware_enabled); kvm_arch_hardware_unsetup(); kvm_arch_exit(); - kvm_vfio_ops_exit(); } EXPORT_SYMBOL_GPL(kvm_exit);