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 X-Spam-Level: X-Spam-Status: No, score=-6.8 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS, URIBL_BLOCKED autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 2C320C31E40 for ; Fri, 9 Aug 2019 16:16:21 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id DAC602171F for ; Fri, 9 Aug 2019 16:16:20 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2437212AbfHIQQU (ORCPT ); Fri, 9 Aug 2019 12:16:20 -0400 Received: from mx01.bbu.dsd.mx.bitdefender.com ([91.199.104.161]:52862 "EHLO mx01.bbu.dsd.mx.bitdefender.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2437078AbfHIQPC (ORCPT ); Fri, 9 Aug 2019 12:15:02 -0400 Received: from smtp.bitdefender.com (smtp02.buh.bitdefender.net [10.17.80.76]) by mx01.bbu.dsd.mx.bitdefender.com (Postfix) with ESMTPS id 8A7A030208C5; Fri, 9 Aug 2019 19:01:07 +0300 (EEST) Received: from localhost.localdomain (unknown [89.136.169.210]) by smtp.bitdefender.com (Postfix) with ESMTPSA id 891CD305B7A0; Fri, 9 Aug 2019 19:01:06 +0300 (EEST) From: =?UTF-8?q?Adalbert=20Laz=C4=83r?= To: kvm@vger.kernel.org Cc: linux-mm@kvack.org, virtualization@lists.linux-foundation.org, Paolo Bonzini , =?UTF-8?q?Radim=20Kr=C4=8Dm=C3=A1=C5=99?= , Konrad Rzeszutek Wilk , Tamas K Lengyel , Mathieu Tarral , =?UTF-8?q?Samuel=20Laur=C3=A9n?= , Patrick Colp , Jan Kiszka , Stefan Hajnoczi , Weijiang Yang , Zhang@vger.kernel.org, Yu C , =?UTF-8?q?Mihai=20Don=C8=9Bu?= , =?UTF-8?q?Adalbert=20Laz=C4=83r?= , He Chen , Zhang Yi Subject: [RFC PATCH v6 37/92] KVM: VMX: Introduce SPP access bitmap and operation functions Date: Fri, 9 Aug 2019 18:59:52 +0300 Message-Id: <20190809160047.8319-38-alazar@bitdefender.com> In-Reply-To: <20190809160047.8319-1-alazar@bitdefender.com> References: <20190809160047.8319-1-alazar@bitdefender.com> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: kvm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org From: Yang Weijiang Create access bitmap for SPP subpages, 4KB/128B = 32bits, for each 4KB physical page, 32bits are required. The bitmap can be easily accessed with a gfn. The initial access bitmap for each physical page is 0xFFFFFFFF, meaning SPP is not enabled for the subpages. Co-developed-by: He Chen Signed-off-by: He Chen Co-developed-by: Zhang Yi Signed-off-by: Zhang Yi Co-developed-by: Yang Weijiang Signed-off-by: Yang Weijiang Message-Id: <20190717133751.12910-5-weijiang.yang@intel.com> Signed-off-by: Adalbert Lazăr --- arch/x86/include/asm/kvm_host.h | 1 + arch/x86/kvm/mmu.c | 50 +++++++++++++++++++++++++++++++++ arch/x86/kvm/x86.c | 11 ++++++++ 3 files changed, 62 insertions(+) diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h index c05984f39923..f0878631b12a 100644 --- a/arch/x86/include/asm/kvm_host.h +++ b/arch/x86/include/asm/kvm_host.h @@ -790,6 +790,7 @@ struct kvm_lpage_info { struct kvm_arch_memory_slot { struct kvm_rmap_head *rmap[KVM_NR_PAGE_SIZES]; + u32 *subpage_wp_info; struct kvm_lpage_info *lpage_info[KVM_NR_PAGE_SIZES - 1]; unsigned short *gfn_track[KVM_PAGE_TRACK_MAX]; }; diff --git a/arch/x86/kvm/mmu.c b/arch/x86/kvm/mmu.c index 8a6287cd2be4..f2774bbcfeed 100644 --- a/arch/x86/kvm/mmu.c +++ b/arch/x86/kvm/mmu.c @@ -1482,6 +1482,56 @@ static u64 *rmap_get_next(struct rmap_iterator *iter) return sptep; } +#define FULL_SPP_ACCESS ((u32)((1ULL << 32) - 1)) + +static int kvm_subpage_create_bitmaps(struct kvm *kvm) +{ + struct kvm_memslots *slots; + struct kvm_memory_slot *memslot; + int i, j, ret; + u32 *buff; + + for (i = 0; i < KVM_ADDRESS_SPACE_NUM; i++) { + slots = __kvm_memslots(kvm, i); + kvm_for_each_memslot(memslot, slots) { + buff = kvzalloc(memslot->npages* + sizeof(*memslot->arch.subpage_wp_info), + GFP_KERNEL); + + if (!buff) { + ret = -ENOMEM; + goto out_free; + } + memslot->arch.subpage_wp_info = buff; + + for(j = 0; j< memslot->npages; j++) + buff[j] = FULL_SPP_ACCESS; + } + } + + return 0; +out_free: + for (i = 0; i < KVM_ADDRESS_SPACE_NUM; i++) { + slots = __kvm_memslots(kvm, i); + kvm_for_each_memslot(memslot, slots) { + if (memslot->arch.subpage_wp_info) { + kvfree(memslot->arch.subpage_wp_info); + memslot->arch.subpage_wp_info = NULL; + } + } + } + + return ret; +} + +static u32 *gfn_to_subpage_wp_info(struct kvm_memory_slot *slot, gfn_t gfn) +{ + unsigned long idx; + + idx = gfn_to_index(gfn, slot->base_gfn, PT_PAGE_TABLE_LEVEL); + return &slot->arch.subpage_wp_info[idx]; +} + #define for_each_rmap_spte(_rmap_head_, _iter_, _spte_) \ for (_spte_ = rmap_get_first(_rmap_head_, _iter_); \ _spte_; _spte_ = rmap_get_next(_iter_)) diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c index ef6d9dd80086..2ac1e0aba1fc 100644 --- a/arch/x86/kvm/x86.c +++ b/arch/x86/kvm/x86.c @@ -9320,6 +9320,17 @@ void kvm_arch_destroy_vm(struct kvm *kvm) kvm_hv_destroy_vm(kvm); } +void kvm_subpage_free_memslot(struct kvm_memory_slot *free, + struct kvm_memory_slot *dont) +{ + + if (!dont || free->arch.subpage_wp_info != + dont->arch.subpage_wp_info) { + kvfree(free->arch.subpage_wp_info); + free->arch.subpage_wp_info = NULL; + } +} + void kvm_arch_free_memslot(struct kvm *kvm, struct kvm_memory_slot *free, struct kvm_memory_slot *dont) {