From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932868Ab2EDUs6 (ORCPT ); Fri, 4 May 2012 16:48:58 -0400 Received: from mail-pz0-f45.google.com ([209.85.210.45]:45099 "EHLO mail-pz0-f45.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932638Ab2EDUsy (ORCPT ); Fri, 4 May 2012 16:48:54 -0400 Message-Id: <20120504204246.520979672@linuxfoundation.org> User-Agent: quilt/0.60-19.1 Date: Fri, 04 May 2012 13:43:03 -0700 From: Greg KH To: linux-kernel@vger.kernel.org, stable@vger.kernel.org, Alex Williamson Cc: torvalds@linux-foundation.org, akpm@linux-foundation.org, alan@lxorguk.ukuu.org.uk, Marcelo Tosatti , Jonathan Nieder Subject: [ 19/47] KVM: unmap pages from the iommu when slots are removed In-Reply-To: <20120504204307.GA13761@kroah.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 3.0-stable review patch. If anyone has any objections, please let me know. ------------------ From: Alex Williamson commit 32f6daad4651a748a58a3ab6da0611862175722f upstream. We've been adding new mappings, but not destroying old mappings. This can lead to a page leak as pages are pinned using get_user_pages, but only unpinned with put_page if they still exist in the memslots list on vm shutdown. A memslot that is destroyed while an iommu domain is enabled for the guest will therefore result in an elevated page reference count that is never cleared. Additionally, without this fix, the iommu is only programmed with the first translation for a gpa. This can result in peer-to-peer errors if a mapping is destroyed and replaced by a new mapping at the same gpa as the iommu will still be pointing to the original, pinned memory address. Signed-off-by: Alex Williamson Signed-off-by: Marcelo Tosatti Signed-off-by: Jonathan Nieder Signed-off-by: Greg Kroah-Hartman --- include/linux/kvm_host.h | 6 ++++++ virt/kvm/iommu.c | 12 ++++++++---- virt/kvm/kvm_main.c | 5 +++-- 3 files changed, 17 insertions(+), 6 deletions(-) --- a/include/linux/kvm_host.h +++ b/include/linux/kvm_host.h @@ -554,6 +554,7 @@ void kvm_free_irq_source_id(struct kvm * #ifdef CONFIG_IOMMU_API int kvm_iommu_map_pages(struct kvm *kvm, struct kvm_memory_slot *slot); +void kvm_iommu_unmap_pages(struct kvm *kvm, struct kvm_memory_slot *slot); int kvm_iommu_map_guest(struct kvm *kvm); int kvm_iommu_unmap_guest(struct kvm *kvm); int kvm_assign_device(struct kvm *kvm, @@ -567,6 +568,11 @@ static inline int kvm_iommu_map_pages(st return 0; } +static inline void kvm_iommu_unmap_pages(struct kvm *kvm, + struct kvm_memory_slot *slot) +{ +} + static inline int kvm_iommu_map_guest(struct kvm *kvm) { return -ENODEV; --- a/virt/kvm/iommu.c +++ b/virt/kvm/iommu.c @@ -285,6 +285,11 @@ static void kvm_iommu_put_pages(struct k } } +void kvm_iommu_unmap_pages(struct kvm *kvm, struct kvm_memory_slot *slot) +{ + kvm_iommu_put_pages(kvm, slot->base_gfn, slot->npages); +} + static int kvm_iommu_unmap_memslots(struct kvm *kvm) { int i, idx; @@ -293,10 +298,9 @@ static int kvm_iommu_unmap_memslots(stru idx = srcu_read_lock(&kvm->srcu); slots = kvm_memslots(kvm); - for (i = 0; i < slots->nmemslots; i++) { - kvm_iommu_put_pages(kvm, slots->memslots[i].base_gfn, - slots->memslots[i].npages); - } + for (i = 0; i < slots->nmemslots; i++) + kvm_iommu_unmap_pages(kvm, &slots->memslots[i]); + srcu_read_unlock(&kvm->srcu, idx); return 0; --- a/virt/kvm/kvm_main.c +++ b/virt/kvm/kvm_main.c @@ -796,12 +796,13 @@ skip_lpage: if (r) goto out_free; - /* map the pages in iommu page table */ + /* map/unmap the pages in iommu page table */ if (npages) { r = kvm_iommu_map_pages(kvm, &new); if (r) goto out_free; - } + } else + kvm_iommu_unmap_pages(kvm, &old); r = -ENOMEM; slots = kzalloc(sizeof(struct kvm_memslots), GFP_KERNEL);