From patchwork Fri Nov 19 13:47:30 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Chao Peng X-Patchwork-Id: 12628951 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 5559EC433F5 for ; Fri, 19 Nov 2021 14:01:50 +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 D6C2461AED for ; Fri, 19 Nov 2021 14:01:49 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.4.1 mail.kernel.org D6C2461AED 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]:47056 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1mo4SY-0003Z0-Mt for qemu-devel@archiver.kernel.org; Fri, 19 Nov 2021 09:01:46 -0500 Received: from eggs.gnu.org ([209.51.188.92]:60516) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1mo4GO-00066m-7S for qemu-devel@nongnu.org; Fri, 19 Nov 2021 08:49:12 -0500 Received: from mga14.intel.com ([192.55.52.115]:20690) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1mo4GL-0000II-Pt for qemu-devel@nongnu.org; Fri, 19 Nov 2021 08:49:11 -0500 X-IronPort-AV: E=McAfee;i="6200,9189,10172"; a="234650749" X-IronPort-AV: E=Sophos;i="5.87,247,1631602800"; d="scan'208";a="234650749" Received: from orsmga008.jf.intel.com ([10.7.209.65]) by fmsmga103.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 19 Nov 2021 05:49:08 -0800 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.87,247,1631602800"; d="scan'208";a="507904885" Received: from chaop.bj.intel.com ([10.240.192.101]) by orsmga008.jf.intel.com with ESMTP; 19 Nov 2021 05:49:00 -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 04/13] KVM: Add fd-based memslot data structure and utils Date: Fri, 19 Nov 2021 21:47:30 +0800 Message-Id: <20211119134739.20218-5-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=192.55.52.115; envelope-from=chao.p.peng@linux.intel.com; helo=mga14.intel.com X-Spam_score_int: -68 X-Spam_score: -6.9 X-Spam_bar: ------ X-Spam_report: (-6.9 / 5.0 requ) BAYES_00=-1.9, RCVD_IN_DNSWL_HI=-5, 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" For fd-based memslot store the file references for shared fd and the private fd (if any) in the memslot structure. Since there is no 'hva' concept we cannot call hva_to_pfn() to get a pfn, instead kvm_memfd_ops is added to get_pfn/put_pfn from the memory backing stores that provide these fds. Signed-off-by: Yu Zhang Signed-off-by: Chao Peng --- include/linux/kvm_host.h | 23 +++++++++++++++++++++++ 1 file changed, 23 insertions(+) diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h index 99e9f9969703..1d4ac0c9b63b 100644 --- a/include/linux/kvm_host.h +++ b/include/linux/kvm_host.h @@ -424,6 +424,12 @@ static inline int kvm_vcpu_exiting_guest_mode(struct kvm_vcpu *vcpu) */ #define KVM_MEM_MAX_NR_PAGES ((1UL << 31) - 1) +struct kvm_memfd_ops { + kvm_pfn_t (*get_pfn)(struct kvm_memory_slot *slot, struct file *file, + gfn_t gfn, bool alloc, int *order); + void (*put_pfn)(kvm_pfn_t pfn); +}; + struct kvm_memory_slot { gfn_t base_gfn; unsigned long npages; @@ -433,6 +439,9 @@ struct kvm_memory_slot { u32 flags; short id; u16 as_id; + struct file *file; + struct file *priv_file; + struct kvm_memfd_ops *memfd_ops; }; static inline bool kvm_slot_dirty_track_enabled(struct kvm_memory_slot *slot) @@ -1310,6 +1319,20 @@ static inline int memslot_id(struct kvm *kvm, gfn_t gfn) return gfn_to_memslot(kvm, gfn)->id; } +static inline bool memslot_is_memfd(const struct kvm_memory_slot *slot) +{ + if (slot && slot->memfd_ops) + return true; + return false; +} + +static inline bool memslot_has_private(const struct kvm_memory_slot *slot) +{ + if (slot && slot->priv_file) + return true; + return false; +} + static inline gfn_t hva_to_gfn_memslot(unsigned long hva, struct kvm_memory_slot *slot) {