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=-9.9 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH, MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT 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 21B2CC43603 for ; Fri, 20 Dec 2019 21:02:30 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id D32B520866 for ; Fri, 20 Dec 2019 21:02:29 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b="BhV9Le6g" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727592AbfLTVCA (ORCPT ); Fri, 20 Dec 2019 16:02:00 -0500 Received: from us-smtp-delivery-1.mimecast.com ([207.211.31.120]:43457 "EHLO us-smtp-1.mimecast.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1727402AbfLTVB5 (ORCPT ); Fri, 20 Dec 2019 16:01:57 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1576875715; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=xQjPBgffYJmUdXwhQa7UpTs/UC7BUPavY9NeRZmBhog=; b=BhV9Le6gKsmYxJz0pbHy/6MVhVGSlFqznNo+oig4hbdNh9ZxmtZUO87cPV/HYfURHwYkqA NBddhR4JcTs/6UQag1iUX84o4EnavVTFljCp+SjBFoxYHnGFHk84l5lfvPZAibCPoN0aiw MCnhJZKVBD5kY4vNxI6h8PXA0RctqCE= Received: from mail-qt1-f199.google.com (mail-qt1-f199.google.com [209.85.160.199]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-147-q6u3GeBNMH2pB_koUfDPQw-1; Fri, 20 Dec 2019 16:01:54 -0500 X-MC-Unique: q6u3GeBNMH2pB_koUfDPQw-1 Received: by mail-qt1-f199.google.com with SMTP id o18so6778751qtt.19 for ; Fri, 20 Dec 2019 13:01:54 -0800 (PST) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=xQjPBgffYJmUdXwhQa7UpTs/UC7BUPavY9NeRZmBhog=; b=DDW/fJ9239OnpuIqKWai10km7VwwcmLcFGCNG6rMA/xe3zPzl5k7/AlY4TELL1AkEN burDxQV6b5/2ZGHccuOFJVIqAFdVootBeDKsTYd0S8xsZ+ewEXRRPm6lK4MbcXnV5ZDj YE02ZjHZbxk+fZYFfE1P7ExGYYh2FPsfIgZfA0a3HDtxmJdKW4UUKNmQlx66UsVdIB0L FspqUW+gr0Ms6nk+9mdYpv0Dm3HVR7PbHISavFFeie9Nc8syn2ViqxKxDDavDRSO2MYa 0mpEEARyjHYJcRGAqECQnaJqk7YNbS5742G+KQk8szJzbPmgzk84nHkdvgiTZOya3r23 Vd3g== X-Gm-Message-State: APjAAAURFiFlT9BblB999FE5HMeBZC9h1/DpCE0LC9jzX2r1BmY6GjF+ CCdyoIJ7QzE2GBN80f4D2mYliD4VzzaiudoVoLCfrUGrp06SBCOTzA8r8I4vMPH7w35W1k2LDwz rQp3E1HAvIS+BiWQsqUyIMUG/ X-Received: by 2002:aed:2bc2:: with SMTP id e60mr13764047qtd.115.1576875713856; Fri, 20 Dec 2019 13:01:53 -0800 (PST) X-Google-Smtp-Source: APXvYqzuBE1A3N8E93iqbotmr3azM+KbgTTBGD9v2FgL7evnpku61I5lZM081A6Fo/1NoNPsSyB6DA== X-Received: by 2002:aed:2bc2:: with SMTP id e60mr13764019qtd.115.1576875713556; Fri, 20 Dec 2019 13:01:53 -0800 (PST) Received: from xz-x1.redhat.com ([104.156.64.74]) by smtp.gmail.com with ESMTPSA id q25sm3243836qkq.88.2019.12.20.13.01.51 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 20 Dec 2019 13:01:52 -0800 (PST) From: Peter Xu To: kvm@vger.kernel.org, linux-kernel@vger.kernel.org Cc: Jason Wang , peterx@redhat.com, Paolo Bonzini , "Dr . David Alan Gilbert" , Sean Christopherson , Christophe de Dinechin , Vitaly Kuznetsov , "Michael S . Tsirkin" Subject: [PATCH v2 03/17] KVM: X86: Don't track dirty for KVM_SET_[TSS_ADDR|IDENTITY_MAP_ADDR] Date: Fri, 20 Dec 2019 16:01:33 -0500 Message-Id: <20191220210147.49617-4-peterx@redhat.com> X-Mailer: git-send-email 2.24.1 In-Reply-To: <20191220210147.49617-1-peterx@redhat.com> References: <20191220210147.49617-1-peterx@redhat.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Originally, we have three code paths that can dirty a page without vcpu context for X86: - init_rmode_identity_map - init_rmode_tss - kvmgt_rw_gpa init_rmode_identity_map and init_rmode_tss will be setup on destination VM no matter what (and the guest cannot even see them), so it does not make sense to track them at all. To do this, a new parameter is added to kvm_[write|clear]_guest_page() to show whether we would like to track dirty bits for the operations. With that, pass in "false" to this new parameter for any guest memory write of the ioctls (KVM_SET_TSS_ADDR, KVM_SET_IDENTITY_MAP_ADDR). Signed-off-by: Peter Xu --- arch/x86/kvm/vmx/vmx.c | 18 ++++++++++-------- include/linux/kvm_host.h | 5 +++-- virt/kvm/kvm_main.c | 25 ++++++++++++++++--------- 3 files changed, 29 insertions(+), 19 deletions(-) diff --git a/arch/x86/kvm/vmx/vmx.c b/arch/x86/kvm/vmx/vmx.c index 04a8212704c1..1ff5a428f489 100644 --- a/arch/x86/kvm/vmx/vmx.c +++ b/arch/x86/kvm/vmx/vmx.c @@ -3452,24 +3452,24 @@ static int init_rmode_tss(struct kvm *kvm) idx = srcu_read_lock(&kvm->srcu); fn = to_kvm_vmx(kvm)->tss_addr >> PAGE_SHIFT; - r = kvm_clear_guest_page(kvm, fn, 0, PAGE_SIZE); + r = kvm_clear_guest_page(kvm, fn, 0, PAGE_SIZE, false); if (r < 0) goto out; data = TSS_BASE_SIZE + TSS_REDIRECTION_SIZE; r = kvm_write_guest_page(kvm, fn++, &data, - TSS_IOPB_BASE_OFFSET, sizeof(u16)); + TSS_IOPB_BASE_OFFSET, sizeof(u16), false); if (r < 0) goto out; - r = kvm_clear_guest_page(kvm, fn++, 0, PAGE_SIZE); + r = kvm_clear_guest_page(kvm, fn++, 0, PAGE_SIZE, false); if (r < 0) goto out; - r = kvm_clear_guest_page(kvm, fn, 0, PAGE_SIZE); + r = kvm_clear_guest_page(kvm, fn, 0, PAGE_SIZE, false); if (r < 0) goto out; data = ~0; r = kvm_write_guest_page(kvm, fn, &data, RMODE_TSS_SIZE - 2 * PAGE_SIZE - 1, - sizeof(u8)); + sizeof(u8), false); out: srcu_read_unlock(&kvm->srcu, idx); return r; @@ -3498,7 +3498,7 @@ static int init_rmode_identity_map(struct kvm *kvm) goto out2; idx = srcu_read_lock(&kvm->srcu); - r = kvm_clear_guest_page(kvm, identity_map_pfn, 0, PAGE_SIZE); + r = kvm_clear_guest_page(kvm, identity_map_pfn, 0, PAGE_SIZE, false); if (r < 0) goto out; /* Set up identity-mapping pagetable for EPT in real mode */ @@ -3506,7 +3506,8 @@ static int init_rmode_identity_map(struct kvm *kvm) tmp = (i << 22) + (_PAGE_PRESENT | _PAGE_RW | _PAGE_USER | _PAGE_ACCESSED | _PAGE_DIRTY | _PAGE_PSE); r = kvm_write_guest_page(kvm, identity_map_pfn, - &tmp, i * sizeof(tmp), sizeof(tmp)); + &tmp, i * sizeof(tmp), + sizeof(tmp), false); if (r < 0) goto out; } @@ -7265,7 +7266,8 @@ static int vmx_write_pml_buffer(struct kvm_vcpu *vcpu) dst = vmcs12->pml_address + sizeof(u64) * vmcs12->guest_pml_index; if (kvm_write_guest_page(vcpu->kvm, gpa_to_gfn(dst), &gpa, - offset_in_page(dst), sizeof(gpa))) + offset_in_page(dst), sizeof(gpa), + false)) return 0; vmcs12->guest_pml_index--; diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h index 2ea1ea79befd..4e34cf97ca90 100644 --- a/include/linux/kvm_host.h +++ b/include/linux/kvm_host.h @@ -734,7 +734,7 @@ int kvm_read_guest(struct kvm *kvm, gpa_t gpa, void *data, unsigned long len); int kvm_read_guest_cached(struct kvm *kvm, struct gfn_to_hva_cache *ghc, void *data, unsigned long len); int kvm_write_guest_page(struct kvm *kvm, gfn_t gfn, const void *data, - int offset, int len); + int offset, int len, bool track_dirty); int kvm_write_guest(struct kvm *kvm, gpa_t gpa, const void *data, unsigned long len); int kvm_write_guest_cached(struct kvm *kvm, struct gfn_to_hva_cache *ghc, @@ -744,7 +744,8 @@ int kvm_write_guest_offset_cached(struct kvm *kvm, struct gfn_to_hva_cache *ghc, unsigned long len); int kvm_gfn_to_hva_cache_init(struct kvm *kvm, struct gfn_to_hva_cache *ghc, gpa_t gpa, unsigned long len); -int kvm_clear_guest_page(struct kvm *kvm, gfn_t gfn, int offset, int len); +int kvm_clear_guest_page(struct kvm *kvm, gfn_t gfn, int offset, int len, + bool track_dirty); int kvm_clear_guest(struct kvm *kvm, gpa_t gpa, unsigned long len); struct kvm_memory_slot *gfn_to_memslot(struct kvm *kvm, gfn_t gfn); bool kvm_is_visible_gfn(struct kvm *kvm, gfn_t gfn); diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c index 7ee28af9eb48..b1047173d78e 100644 --- a/virt/kvm/kvm_main.c +++ b/virt/kvm/kvm_main.c @@ -2051,7 +2051,8 @@ int kvm_vcpu_read_guest_atomic(struct kvm_vcpu *vcpu, gpa_t gpa, EXPORT_SYMBOL_GPL(kvm_vcpu_read_guest_atomic); static int __kvm_write_guest_page(struct kvm_memory_slot *memslot, gfn_t gfn, - const void *data, int offset, int len) + const void *data, int offset, int len, + bool track_dirty) { int r; unsigned long addr; @@ -2062,16 +2063,19 @@ static int __kvm_write_guest_page(struct kvm_memory_slot *memslot, gfn_t gfn, r = __copy_to_user((void __user *)addr + offset, data, len); if (r) return -EFAULT; - mark_page_dirty_in_slot(memslot, gfn); + if (track_dirty) + mark_page_dirty_in_slot(memslot, gfn); return 0; } int kvm_write_guest_page(struct kvm *kvm, gfn_t gfn, - const void *data, int offset, int len) + const void *data, int offset, int len, + bool track_dirty) { struct kvm_memory_slot *slot = gfn_to_memslot(kvm, gfn); - return __kvm_write_guest_page(slot, gfn, data, offset, len); + return __kvm_write_guest_page(slot, gfn, data, offset, len, + track_dirty); } EXPORT_SYMBOL_GPL(kvm_write_guest_page); @@ -2080,7 +2084,8 @@ int kvm_vcpu_write_guest_page(struct kvm_vcpu *vcpu, gfn_t gfn, { struct kvm_memory_slot *slot = kvm_vcpu_gfn_to_memslot(vcpu, gfn); - return __kvm_write_guest_page(slot, gfn, data, offset, len); + return __kvm_write_guest_page(slot, gfn, data, offset, + len, true); } EXPORT_SYMBOL_GPL(kvm_vcpu_write_guest_page); @@ -2093,7 +2098,7 @@ int kvm_write_guest(struct kvm *kvm, gpa_t gpa, const void *data, int ret; while ((seg = next_segment(len, offset)) != 0) { - ret = kvm_write_guest_page(kvm, gfn, data, offset, seg); + ret = kvm_write_guest_page(kvm, gfn, data, offset, seg, true); if (ret < 0) return ret; offset = 0; @@ -2232,11 +2237,13 @@ int kvm_read_guest_cached(struct kvm *kvm, struct gfn_to_hva_cache *ghc, } EXPORT_SYMBOL_GPL(kvm_read_guest_cached); -int kvm_clear_guest_page(struct kvm *kvm, gfn_t gfn, int offset, int len) +int kvm_clear_guest_page(struct kvm *kvm, gfn_t gfn, int offset, int len, + bool track_dirty) { const void *zero_page = (const void *) __va(page_to_phys(ZERO_PAGE(0))); - return kvm_write_guest_page(kvm, gfn, zero_page, offset, len); + return kvm_write_guest_page(kvm, gfn, zero_page, offset, len, + track_dirty); } EXPORT_SYMBOL_GPL(kvm_clear_guest_page); @@ -2248,7 +2255,7 @@ int kvm_clear_guest(struct kvm *kvm, gpa_t gpa, unsigned long len) int ret; while ((seg = next_segment(len, offset)) != 0) { - ret = kvm_clear_guest_page(kvm, gfn, offset, seg); + ret = kvm_clear_guest_page(kvm, gfn, offset, seg, true); if (ret < 0) return ret; offset = 0; -- 2.24.1