From patchwork Fri Oct 27 18:22:01 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Sean Christopherson X-Patchwork-Id: 13439021 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 bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id AAE80C25B48 for ; Fri, 27 Oct 2023 18:24:55 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender: Content-Transfer-Encoding:Content-Type:Reply-To:List-Subscribe:List-Help: List-Post:List-Archive:List-Unsubscribe:List-Id:Cc:To:From:Subject:Message-ID :References:Mime-Version:In-Reply-To:Date:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=s8nVfLutAqYlnQOgkXBIEy+ohMngjRCF7tMJYa/KzAk=; b=IcGY3Mna/GSio1 n9k3BtfemlT6zIP6JBbf6f+EfEsLu8iqkPgllFUl4CBQsR17G8+zN+N6d8w2rloUYQfV6xKT4wYMq n/Jbb1VkVbpqN9FmXYJ/Wi+PMOfyMBYMSk0Uv+Ig7RDyI8RabsTP0bagTIXuR9r4tucisRIp2GqRk 8JqIxwzcx5IgJLOXXF9vLFqTPf/0SQONl54h9mZXsA0jIgefQpDiQJI0HV8RthBdD3aY6sg+pWjSR YU4GOK/4IbjOCSZX1W9m33aWkGSwEUrXEtGp7foZt1Add8JQ0+1zxBRxqtbG/UZxewaPZKhtvKc0o lg/N4N5U3yRiU64ckX5w==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.96 #2 (Red Hat Linux)) id 1qwRVo-00Gynl-1a; Fri, 27 Oct 2023 18:24:48 +0000 Received: from desiato.infradead.org ([2001:8b0:10b:1:d65d:64ff:fe57:4e05]) by bombadil.infradead.org with esmtps (Exim 4.96 #2 (Red Hat Linux)) id 1qwRUD-00GxP4-2z for linux-riscv@bombadil.infradead.org; Fri, 27 Oct 2023 18:23:10 +0000 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=desiato.20200630; h=Content-Type:Cc:To:From:Subject: Message-ID:References:Mime-Version:In-Reply-To:Date:Reply-To:Sender: Content-Transfer-Encoding:Content-ID:Content-Description; bh=X28f2VSZ9uWGkcVQfgyyaL29edWIecAA+BgvPUM1/nQ=; b=rdjZ88qSnzapxFDAYKFJ/dnjsW Z/6s/FM1lWi8SAENjmu99ekuvm61WKesr9eQKLT85jFtrcC33aFwQ6f5mmufz/CX7+9cKOwdqUESM NZJT37z0r6Pnb2sWF5iA5HPw/acHnxOc/HYSeAwlM1HQZyaW2TCoyFBRDsXrePeZfFkX3ertjJMec hO/7poFIRUuwyzPFs5rWJ16Oly5hQlWXR0AOV5V9GbtHOhHx6KR0P/+wuvROrcQqAFDju2LteVq4R IqRNlDH/OUF7VQCeU4BbVn1yyXSDrkPZw++BHcNEu6mBYjRcqtmtVbTcNb2kled28fMbKlga1uHqv PwcoXy5g==; Received: from mail-pl1-x649.google.com ([2607:f8b0:4864:20::649]) by desiato.infradead.org with esmtps (Exim 4.96 #2 (Red Hat Linux)) id 1qwRU9-000ufb-1r for linux-riscv@lists.infradead.org; Fri, 27 Oct 2023 18:23:08 +0000 Received: by mail-pl1-x649.google.com with SMTP id d9443c01a7336-1cc281f1214so4820865ad.2 for ; Fri, 27 Oct 2023 11:23:04 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20230601; t=1698430983; x=1699035783; darn=lists.infradead.org; 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=X28f2VSZ9uWGkcVQfgyyaL29edWIecAA+BgvPUM1/nQ=; b=pHumbkLhV8jzyFBLptfNINYThsmA/Kkp1Bwb+h4jSLfuaLgRiiOs0EqI6Lzq/ZDaeW EsxN1H5h1kn0+tNpVSS9+7OaXXiLAJChMCUKT5WemZaSFyEF91DI7czFx5yG8bx2UYKY I6nghf+45wTr+ky7nFcv9IcUyCjjySkI4fBQioSr1vdghPwc+SQNOiT7cFA+CBVz/qPM d/ADVErKYZa42QMtFPnkOmbnpLb3icdOq27VyBpUJ+Z7ucGKX3wBgaP/cDSIQEtyurbI 96Mg9RB+pp7KMuZiobWg0KSsXJPO6SlQggzEtVAl7ipHGWLqmH2v2tQYjIEaCFTl/1mZ TVtw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1698430983; x=1699035783; 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=X28f2VSZ9uWGkcVQfgyyaL29edWIecAA+BgvPUM1/nQ=; b=YsROQ2gzrsBEKIip0Pxkfc278r7fz1W0hxPkKa/ms4JxZkcSnKH7fttPwgJyWgbcmO N8c4F3wqvIiNQ/4xKrU1Q4jr4NdFKvxO0Fwsm0YCpxK+Z0SLdelVT0nk612hsb4QHye2 iUAf/MGYRIyS6HMcdVZ6VMDS0voznoWEPrLuof+bBkKndtGaUG3rM8//fF5B+vJTpc0S HXqcuOxlM2fQFpNQFZZeaO9Cmn1rJF5AjXk+xWVLFdpaVzsFC21X60s8PPdX8CVuEZij ZfXf/Ek3a7dD9u6sYOqXdp8gR/LvatZ8+16aFVBb2nn7Vki17td1pLXPzCNP2778tu6p LFdQ== X-Gm-Message-State: AOJu0Yx0T9aNLiIWSc/wuvRS5+ygs0LbGXnlcwA61mU+VHUFcF9QgJ6y maHFdB0j6jB4H/TF1NS6Rj6XmLnkyO4= X-Google-Smtp-Source: AGHT+IERP39eT1EKIW0o0w4FIDOku618XMvV1N7KQCMi55hnYoVKlxflcru5UfA66foRhtHASvLd2ndsc5U= X-Received: from zagreus.c.googlers.com ([fda3:e722:ac3:cc00:7f:e700:c0a8:5c37]) (user=seanjc job=sendgmr) by 2002:a17:902:d4cc:b0:1cc:1900:28d7 with SMTP id o12-20020a170902d4cc00b001cc190028d7mr82404plg.12.1698430983359; Fri, 27 Oct 2023 11:23:03 -0700 (PDT) Date: Fri, 27 Oct 2023 11:22:01 -0700 In-Reply-To: <20231027182217.3615211-1-seanjc@google.com> Mime-Version: 1.0 References: <20231027182217.3615211-1-seanjc@google.com> X-Mailer: git-send-email 2.42.0.820.g83a721a137-goog Message-ID: <20231027182217.3615211-20-seanjc@google.com> Subject: [PATCH v13 19/35] KVM: x86: Disallow hugepages when memory attributes are mixed From: Sean Christopherson To: Paolo Bonzini , Marc Zyngier , Oliver Upton , Huacai Chen , Michael Ellerman , Anup Patel , Paul Walmsley , Palmer Dabbelt , Albert Ou , Sean Christopherson , Alexander Viro , Christian Brauner , "Matthew Wilcox (Oracle)" , Andrew Morton Cc: kvm@vger.kernel.org, linux-arm-kernel@lists.infradead.org, kvmarm@lists.linux.dev, linux-mips@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, kvm-riscv@lists.infradead.org, linux-riscv@lists.infradead.org, linux-fsdevel@vger.kernel.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org, Xiaoyao Li , Xu Yilun , Chao Peng , Fuad Tabba , Jarkko Sakkinen , Anish Moorthy , David Matlack , Yu Zhang , Isaku Yamahata , " =?utf-8?q?Micka=C3=ABl_Sala?= =?utf-8?q?=C3=BCn?= " , Vlastimil Babka , Vishal Annapurve , Ackerley Tng , Maciej Szmigiero , David Hildenbrand , Quentin Perret , Michael Roth , Wang , Liam Merwick , Isaku Yamahata , "Kirill A . Shutemov" X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20231027_192305_820353_CB17E2E5 X-CRM114-Status: GOOD ( 25.49 ) X-BeenThere: linux-riscv@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Reply-To: Sean Christopherson Sender: "linux-riscv" Errors-To: linux-riscv-bounces+linux-riscv=archiver.kernel.org@lists.infradead.org From: Chao Peng Disallow creating hugepages with mixed memory attributes, e.g. shared versus private, as mapping a hugepage in this case would allow the guest to access memory with the wrong attributes, e.g. overlaying private memory with a shared hugepage. Tracking whether or not attributes are mixed via the existing disallow_lpage field, but use the most significant bit in 'disallow_lpage' to indicate a hugepage has mixed attributes instead using the normal refcounting. Whether or not attributes are mixed is binary; either they are or they aren't. Attempting to squeeze that info into the refcount is unnecessarily complex as it would require knowing the previous state of the mixed count when updating attributes. Using a flag means KVM just needs to ensure the current status is reflected in the memslots. Signed-off-by: Chao Peng Co-developed-by: Sean Christopherson Signed-off-by: Sean Christopherson --- arch/x86/include/asm/kvm_host.h | 3 + arch/x86/kvm/mmu/mmu.c | 154 +++++++++++++++++++++++++++++++- arch/x86/kvm/x86.c | 4 + 3 files changed, 159 insertions(+), 2 deletions(-) diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h index 31e84668014e..8d60e4745e8b 100644 --- a/arch/x86/include/asm/kvm_host.h +++ b/arch/x86/include/asm/kvm_host.h @@ -1836,6 +1836,9 @@ int kvm_mmu_create(struct kvm_vcpu *vcpu); void kvm_mmu_init_vm(struct kvm *kvm); void kvm_mmu_uninit_vm(struct kvm *kvm); +void kvm_mmu_init_memslot_memory_attributes(struct kvm *kvm, + struct kvm_memory_slot *slot); + void kvm_mmu_after_set_cpuid(struct kvm_vcpu *vcpu); void kvm_mmu_reset_context(struct kvm_vcpu *vcpu); void kvm_mmu_slot_remove_write_access(struct kvm *kvm, diff --git a/arch/x86/kvm/mmu/mmu.c b/arch/x86/kvm/mmu/mmu.c index d33657d61d80..4167d557c577 100644 --- a/arch/x86/kvm/mmu/mmu.c +++ b/arch/x86/kvm/mmu/mmu.c @@ -795,16 +795,26 @@ static struct kvm_lpage_info *lpage_info_slot(gfn_t gfn, return &slot->arch.lpage_info[level - 2][idx]; } +/* + * The most significant bit in disallow_lpage tracks whether or not memory + * attributes are mixed, i.e. not identical for all gfns at the current level. + * The lower order bits are used to refcount other cases where a hugepage is + * disallowed, e.g. if KVM has shadow a page table at the gfn. + */ +#define KVM_LPAGE_MIXED_FLAG BIT(31) + static void update_gfn_disallow_lpage_count(const struct kvm_memory_slot *slot, gfn_t gfn, int count) { struct kvm_lpage_info *linfo; - int i; + int old, i; for (i = PG_LEVEL_2M; i <= KVM_MAX_HUGEPAGE_LEVEL; ++i) { linfo = lpage_info_slot(gfn, slot, i); + + old = linfo->disallow_lpage; linfo->disallow_lpage += count; - WARN_ON_ONCE(linfo->disallow_lpage < 0); + WARN_ON_ONCE((old ^ linfo->disallow_lpage) & KVM_LPAGE_MIXED_FLAG); } } @@ -7161,3 +7171,143 @@ void kvm_mmu_pre_destroy_vm(struct kvm *kvm) if (kvm->arch.nx_huge_page_recovery_thread) kthread_stop(kvm->arch.nx_huge_page_recovery_thread); } + +#ifdef CONFIG_KVM_GENERIC_MEMORY_ATTRIBUTES +static bool hugepage_test_mixed(struct kvm_memory_slot *slot, gfn_t gfn, + int level) +{ + return lpage_info_slot(gfn, slot, level)->disallow_lpage & KVM_LPAGE_MIXED_FLAG; +} + +static void hugepage_clear_mixed(struct kvm_memory_slot *slot, gfn_t gfn, + int level) +{ + lpage_info_slot(gfn, slot, level)->disallow_lpage &= ~KVM_LPAGE_MIXED_FLAG; +} + +static void hugepage_set_mixed(struct kvm_memory_slot *slot, gfn_t gfn, + int level) +{ + lpage_info_slot(gfn, slot, level)->disallow_lpage |= KVM_LPAGE_MIXED_FLAG; +} + +static bool hugepage_has_attrs(struct kvm *kvm, struct kvm_memory_slot *slot, + gfn_t gfn, int level, unsigned long attrs) +{ + const unsigned long start = gfn; + const unsigned long end = start + KVM_PAGES_PER_HPAGE(level); + + if (level == PG_LEVEL_2M) + return kvm_range_has_memory_attributes(kvm, start, end, attrs); + + for (gfn = start; gfn < end; gfn += KVM_PAGES_PER_HPAGE(level - 1)) { + if (hugepage_test_mixed(slot, gfn, level - 1) || + attrs != kvm_get_memory_attributes(kvm, gfn)) + return false; + } + return true; +} + +bool kvm_arch_post_set_memory_attributes(struct kvm *kvm, + struct kvm_gfn_range *range) +{ + unsigned long attrs = range->arg.attributes; + struct kvm_memory_slot *slot = range->slot; + int level; + + lockdep_assert_held_write(&kvm->mmu_lock); + lockdep_assert_held(&kvm->slots_lock); + + /* + * Calculate which ranges can be mapped with hugepages even if the slot + * can't map memory PRIVATE. KVM mustn't create a SHARED hugepage over + * a range that has PRIVATE GFNs, and conversely converting a range to + * SHARED may now allow hugepages. + */ + if (WARN_ON_ONCE(!kvm_arch_has_private_mem(kvm))) + return false; + + /* + * The sequence matters here: upper levels consume the result of lower + * level's scanning. + */ + for (level = PG_LEVEL_2M; level <= KVM_MAX_HUGEPAGE_LEVEL; level++) { + gfn_t nr_pages = KVM_PAGES_PER_HPAGE(level); + gfn_t gfn = gfn_round_for_level(range->start, level); + + /* Process the head page if it straddles the range. */ + if (gfn != range->start || gfn + nr_pages > range->end) { + /* + * Skip mixed tracking if the aligned gfn isn't covered + * by the memslot, KVM can't use a hugepage due to the + * misaligned address regardless of memory attributes. + */ + if (gfn >= slot->base_gfn) { + if (hugepage_has_attrs(kvm, slot, gfn, level, attrs)) + hugepage_clear_mixed(slot, gfn, level); + else + hugepage_set_mixed(slot, gfn, level); + } + gfn += nr_pages; + } + + /* + * Pages entirely covered by the range are guaranteed to have + * only the attributes which were just set. + */ + for ( ; gfn + nr_pages <= range->end; gfn += nr_pages) + hugepage_clear_mixed(slot, gfn, level); + + /* + * Process the last tail page if it straddles the range and is + * contained by the memslot. Like the head page, KVM can't + * create a hugepage if the slot size is misaligned. + */ + if (gfn < range->end && + (gfn + nr_pages) <= (slot->base_gfn + slot->npages)) { + if (hugepage_has_attrs(kvm, slot, gfn, level, attrs)) + hugepage_clear_mixed(slot, gfn, level); + else + hugepage_set_mixed(slot, gfn, level); + } + } + return false; +} + +void kvm_mmu_init_memslot_memory_attributes(struct kvm *kvm, + struct kvm_memory_slot *slot) +{ + int level; + + if (!kvm_arch_has_private_mem(kvm)) + return; + + for (level = PG_LEVEL_2M; level <= KVM_MAX_HUGEPAGE_LEVEL; level++) { + /* + * Don't bother tracking mixed attributes for pages that can't + * be huge due to alignment, i.e. process only pages that are + * entirely contained by the memslot. + */ + gfn_t end = gfn_round_for_level(slot->base_gfn + slot->npages, level); + gfn_t start = gfn_round_for_level(slot->base_gfn, level); + gfn_t nr_pages = KVM_PAGES_PER_HPAGE(level); + gfn_t gfn; + + if (start < slot->base_gfn) + start += nr_pages; + + /* + * Unlike setting attributes, every potential hugepage needs to + * be manually checked as the attributes may already be mixed. + */ + for (gfn = start; gfn < end; gfn += nr_pages) { + unsigned long attrs = kvm_get_memory_attributes(kvm, gfn); + + if (hugepage_has_attrs(kvm, slot, gfn, level, attrs)) + hugepage_clear_mixed(slot, gfn, level); + else + hugepage_set_mixed(slot, gfn, level); + } + } +} +#endif diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c index f41dbb1465a0..824b58b44382 100644 --- a/arch/x86/kvm/x86.c +++ b/arch/x86/kvm/x86.c @@ -12607,6 +12607,10 @@ static int kvm_alloc_memslot_metadata(struct kvm *kvm, } } +#ifdef CONFIG_KVM_GENERIC_MEMORY_ATTRIBUTES + kvm_mmu_init_memslot_memory_attributes(kvm, slot); +#endif + if (kvm_page_track_create_memslot(kvm, slot, npages)) goto out_free;