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 mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 6F6C4C433EF for ; Fri, 19 Nov 2021 13:52:07 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id 20ECE61247 for ; Fri, 19 Nov 2021 13:52:07 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.4.1 mail.kernel.org 20ECE61247 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=kvack.org Received: by kanga.kvack.org (Postfix) id 5CD8D6B0082; Fri, 19 Nov 2021 08:49:37 -0500 (EST) Received: by kanga.kvack.org (Postfix, from userid 40) id 551826B0083; Fri, 19 Nov 2021 08:49:37 -0500 (EST) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 3A4EA6B0085; Fri, 19 Nov 2021 08:49:37 -0500 (EST) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0046.hostedemail.com [216.40.44.46]) by kanga.kvack.org (Postfix) with ESMTP id 2BA356B0082 for ; Fri, 19 Nov 2021 08:49:37 -0500 (EST) Received: from smtpin18.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay04.hostedemail.com (Postfix) with ESMTP id E05DB8B773 for ; Fri, 19 Nov 2021 13:49:26 +0000 (UTC) X-FDA: 78825811974.18.96C38CD Received: from mga06.intel.com (mga06.intel.com [134.134.136.31]) by imf16.hostedemail.com (Postfix) with ESMTP id DCB82F00009E for ; Fri, 19 Nov 2021 13:49:23 +0000 (UTC) X-IronPort-AV: E=McAfee;i="6200,9189,10172"; a="295228673" X-IronPort-AV: E=Sophos;i="5.87,247,1631602800"; d="scan'208";a="295228673" Received: from orsmga008.jf.intel.com ([10.7.209.65]) by orsmga104.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 19 Nov 2021 05:49:24 -0800 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.87,247,1631602800"; d="scan'208";a="507904988" Received: from chaop.bj.intel.com ([10.240.192.101]) by orsmga008.jf.intel.com with ESMTP; 19 Nov 2021 05:49:16 -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 Cc: Paolo Bonzini , Jonathan Corbet , Sean Christopherson , Vitaly Kuznetsov , Wanpeng Li , Jim Mattson , Joerg Roedel , Thomas Gleixner , Ingo Molnar , Borislav Petkov , x86@kernel.org, "H . Peter Anvin" , Hugh Dickins , Jeff Layton , "J . Bruce Fields" , Andrew Morton , Yu Zhang , Chao Peng , "Kirill A . Shutemov" , luto@kernel.org, john.ji@intel.com, susie.li@intel.com, jun.nakajima@intel.com, dave.hansen@intel.com, ak@linux.intel.com, david@redhat.com Subject: [RFC v2 PATCH 06/13] KVM: Register/unregister memfd backed memslot Date: Fri, 19 Nov 2021 21:47:32 +0800 Message-Id: <20211119134739.20218-7-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> X-Rspamd-Server: rspam08 X-Rspamd-Queue-Id: DCB82F00009E X-Stat-Signature: 9448irxixpdz88ycd1bqrs97zcnyyd5x Authentication-Results: imf16.hostedemail.com; dkim=none; spf=none (imf16.hostedemail.com: domain of chao.p.peng@linux.intel.com has no SPF policy when checking 134.134.136.31) smtp.mailfrom=chao.p.peng@linux.intel.com; dmarc=fail reason="No valid SPF, No valid DKIM" header.from=intel.com (policy=none) X-HE-Tag: 1637329763-721555 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: Signed-off-by: Yu Zhang Signed-off-by: Chao Peng --- virt/kvm/kvm_main.c | 23 +++++++++++++++++++---- 1 file changed, 19 insertions(+), 4 deletions(-) diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c index 271cef8d1cd0..b8673490d301 100644 --- a/virt/kvm/kvm_main.c +++ b/virt/kvm/kvm_main.c @@ -1426,7 +1426,7 @@ static void update_memslots(struct kvm_memslots *slots, static int check_memory_region_flags(struct kvm *kvm, const struct kvm_userspace_memory_region_ext *mem) { - u32 valid_flags = 0; + u32 valid_flags = KVM_MEM_FD; if (!kvm->dirty_log_unsupported) valid_flags |= KVM_MEM_LOG_DIRTY_PAGES; @@ -1604,10 +1604,20 @@ static int kvm_set_memslot(struct kvm *kvm, kvm_copy_memslots(slots, __kvm_memslots(kvm, as_id)); } + if (mem->flags & KVM_MEM_FD && change == KVM_MR_CREATE) { + r = kvm_memfd_register(kvm, mem, new); + if (r) + goto out_slots; + } + r = kvm_arch_prepare_memory_region(kvm, new, mem, change); if (r) goto out_slots; + if (mem->flags & KVM_MEM_FD && (r || change == KVM_MR_DELETE)) { + kvm_memfd_unregister(kvm, new); + } + update_memslots(slots, new, change); slots = install_new_memslots(kvm, as_id, slots); @@ -1683,10 +1693,12 @@ int __kvm_set_memory_region(struct kvm *kvm, return -EINVAL; if (mem->guest_phys_addr & (PAGE_SIZE - 1)) return -EINVAL; - /* We can read the guest memory with __xxx_user() later on. */ if ((mem->userspace_addr & (PAGE_SIZE - 1)) || - (mem->userspace_addr != untagged_addr(mem->userspace_addr)) || - !access_ok((void __user *)(unsigned long)mem->userspace_addr, + (mem->userspace_addr != untagged_addr(mem->userspace_addr))) + return -EINVAL; + /* We can read the guest memory with __xxx_user() later on. */ + if (!(mem->flags & KVM_MEM_FD) && + !access_ok((void __user *)(unsigned long)mem->userspace_addr, mem->memory_size)) return -EINVAL; if (as_id >= KVM_ADDRESS_SPACE_NUM || id >= KVM_MEM_SLOTS_NUM) @@ -1727,6 +1739,9 @@ int __kvm_set_memory_region(struct kvm *kvm, new.dirty_bitmap = NULL; memset(&new.arch, 0, sizeof(new.arch)); } else { /* Modify an existing slot. */ + /* Private memslots are immutable, they can only be deleted. */ + if (mem->flags & KVM_MEM_FD && mem->private_fd >= 0) + return -EINVAL; if ((new.userspace_addr != old.userspace_addr) || (new.npages != old.npages) || ((new.flags ^ old.flags) & KVM_MEM_READONLY)) -- 2.17.1