From patchwork Fri Nov 19 13:47:39 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Chao Peng X-Patchwork-Id: 12628949 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 mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 7BBDBC433EF for ; Fri, 19 Nov 2021 13:59:54 +0000 (UTC) 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 mail.kernel.org (Postfix) with ESMTPS id ECCF561AD0 for ; Fri, 19 Nov 2021 13:59:53 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.4.1 mail.kernel.org ECCF561AD0 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=linux.intel.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=nongnu.org Received: from localhost ([::1]:42322 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1mo4Qi-0000Js-VM for qemu-devel@archiver.kernel.org; Fri, 19 Nov 2021 08:59:53 -0500 Received: from eggs.gnu.org ([209.51.188.92]:60916) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1mo4HZ-00086I-H8 for qemu-devel@nongnu.org; Fri, 19 Nov 2021 08:50:25 -0500 Received: from mga18.intel.com ([134.134.136.126]:22057) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1mo4HW-0000kB-SX for qemu-devel@nongnu.org; Fri, 19 Nov 2021 08:50:24 -0500 X-IronPort-AV: E=McAfee;i="6200,9189,10172"; a="221294106" X-IronPort-AV: E=Sophos;i="5.87,247,1631602800"; d="scan'208";a="221294106" Received: from orsmga008.jf.intel.com ([10.7.209.65]) by orsmga106.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 19 Nov 2021 05:50:21 -0800 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.87,247,1631602800"; d="scan'208";a="507905274" Received: from chaop.bj.intel.com ([10.240.192.101]) by orsmga008.jf.intel.com with ESMTP; 19 Nov 2021 05:50:13 -0800 From: Chao Peng To: kvm@vger.kernel.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, linux-fsdevel@vger.kernel.org, qemu-devel@nongnu.org Subject: [RFC v2 PATCH 13/13] KVM: Enable memfd based page invalidation/fallocate Date: Fri, 19 Nov 2021 21:47:39 +0800 Message-Id: <20211119134739.20218-14-chao.p.peng@linux.intel.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20211119134739.20218-1-chao.p.peng@linux.intel.com> References: <20211119134739.20218-1-chao.p.peng@linux.intel.com> Received-SPF: none client-ip=134.134.136.126; envelope-from=chao.p.peng@linux.intel.com; helo=mga18.intel.com X-Spam_score_int: -41 X-Spam_score: -4.2 X-Spam_bar: ---- X-Spam_report: (-4.2 / 5.0 requ) BAYES_00=-1.9, RCVD_IN_DNSWL_MED=-2.3, SPF_HELO_NONE=0.001, SPF_NONE=0.001 autolearn=ham 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: , Cc: Wanpeng Li , jun.nakajima@intel.com, david@redhat.com, "J . Bruce Fields" , dave.hansen@intel.com, "H . Peter Anvin" , Chao Peng , ak@linux.intel.com, Jonathan Corbet , Joerg Roedel , x86@kernel.org, Hugh Dickins , Ingo Molnar , Borislav Petkov , luto@kernel.org, Thomas Gleixner , Vitaly Kuznetsov , Jim Mattson , Sean Christopherson , susie.li@intel.com, Jeff Layton , john.ji@intel.com, Yu Zhang , Paolo Bonzini , Andrew Morton , "Kirill A . Shutemov" Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" Since the memory backing store does not get notified when VM is destroyed so need check if VM is still live in these callbacks. Signed-off-by: Yu Zhang Signed-off-by: Chao Peng --- virt/kvm/memfd.c | 22 ++++++++++++++++++++++ 1 file changed, 22 insertions(+) diff --git a/virt/kvm/memfd.c b/virt/kvm/memfd.c index bd930dcb455f..bcfdc685ce22 100644 --- a/virt/kvm/memfd.c +++ b/virt/kvm/memfd.c @@ -12,16 +12,38 @@ #include const static struct guest_mem_ops *memfd_ops; +static bool vm_is_dead(struct kvm *vm) +{ + struct kvm *kvm; + + list_for_each_entry(kvm, &vm_list, vm_list) { + if (kvm == vm) + return false; + } + + return true; +} + static void memfd_invalidate_page_range(struct inode *inode, void *owner, pgoff_t start, pgoff_t end) { //!!!We can get here after the owner no longer exists + if (vm_is_dead(owner)) + return; + + kvm_memfd_invalidate_range(owner, inode, start >> PAGE_SHIFT, + end >> PAGE_SHIFT); } static void memfd_fallocate(struct inode *inode, void *owner, pgoff_t start, pgoff_t end) { //!!!We can get here after the owner no longer exists + if (vm_is_dead(owner)) + return; + + kvm_memfd_fallocate_range(owner, inode, start >> PAGE_SHIFT, + end >> PAGE_SHIFT); } static const struct guest_ops memfd_notifier = {