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![Joerg Roedel](/assets/img/avatar_default.png)
For 32bit machines where the physical address width is larger than the virtual address width the frame number types in KVM may overflow. Fix this by changing them to u64. [sfr: fix build on 32-bit ppc] Signed-off-by: Joerg Roedel <joerg.roedel@amd.com> Signed-off-by: Stephen Rothwell <sfr@canb.auug.org.au> Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
316 lines
7.1 KiB
C
316 lines
7.1 KiB
C
/*
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* Copyright (c) 2006, Intel Corporation.
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms and conditions of the GNU General Public License,
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* version 2, as published by the Free Software Foundation.
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*
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* This program is distributed in the hope it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*
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* You should have received a copy of the GNU General Public License along with
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* this program; if not, write to the Free Software Foundation, Inc., 59 Temple
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* Place - Suite 330, Boston, MA 02111-1307 USA.
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*
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* Copyright (C) 2006-2008 Intel Corporation
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* Copyright IBM Corporation, 2008
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* Copyright 2010 Red Hat, Inc. and/or its affiliates.
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*
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* Author: Allen M. Kay <allen.m.kay@intel.com>
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* Author: Weidong Han <weidong.han@intel.com>
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* Author: Ben-Ami Yassour <benami@il.ibm.com>
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*/
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#include <linux/list.h>
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#include <linux/kvm_host.h>
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#include <linux/pci.h>
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#include <linux/dmar.h>
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#include <linux/iommu.h>
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#include <linux/intel-iommu.h>
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static int kvm_iommu_unmap_memslots(struct kvm *kvm);
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static void kvm_iommu_put_pages(struct kvm *kvm,
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gfn_t base_gfn, unsigned long npages);
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static pfn_t kvm_pin_pages(struct kvm *kvm, struct kvm_memory_slot *slot,
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gfn_t gfn, unsigned long size)
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{
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gfn_t end_gfn;
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pfn_t pfn;
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pfn = gfn_to_pfn_memslot(kvm, slot, gfn);
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end_gfn = gfn + (size >> PAGE_SHIFT);
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gfn += 1;
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if (is_error_pfn(pfn))
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return pfn;
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while (gfn < end_gfn)
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gfn_to_pfn_memslot(kvm, slot, gfn++);
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return pfn;
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}
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int kvm_iommu_map_pages(struct kvm *kvm, struct kvm_memory_slot *slot)
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{
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gfn_t gfn, end_gfn;
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pfn_t pfn;
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int r = 0;
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struct iommu_domain *domain = kvm->arch.iommu_domain;
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int flags;
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/* check if iommu exists and in use */
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if (!domain)
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return 0;
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gfn = slot->base_gfn;
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end_gfn = gfn + slot->npages;
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flags = IOMMU_READ | IOMMU_WRITE;
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if (kvm->arch.iommu_flags & KVM_IOMMU_CACHE_COHERENCY)
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flags |= IOMMU_CACHE;
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while (gfn < end_gfn) {
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unsigned long page_size;
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/* Check if already mapped */
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if (iommu_iova_to_phys(domain, gfn_to_gpa(gfn))) {
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gfn += 1;
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continue;
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}
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/* Get the page size we could use to map */
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page_size = kvm_host_page_size(kvm, gfn);
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/* Make sure the page_size does not exceed the memslot */
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while ((gfn + (page_size >> PAGE_SHIFT)) > end_gfn)
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page_size >>= 1;
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/* Make sure gfn is aligned to the page size we want to map */
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while ((gfn << PAGE_SHIFT) & (page_size - 1))
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page_size >>= 1;
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/*
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* Pin all pages we are about to map in memory. This is
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* important because we unmap and unpin in 4kb steps later.
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*/
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pfn = kvm_pin_pages(kvm, slot, gfn, page_size);
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if (is_error_pfn(pfn)) {
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gfn += 1;
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continue;
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}
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/* Map into IO address space */
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r = iommu_map(domain, gfn_to_gpa(gfn), pfn_to_hpa(pfn),
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get_order(page_size), flags);
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if (r) {
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printk(KERN_ERR "kvm_iommu_map_address:"
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"iommu failed to map pfn=%llx\n", pfn);
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goto unmap_pages;
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}
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gfn += page_size >> PAGE_SHIFT;
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}
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return 0;
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unmap_pages:
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kvm_iommu_put_pages(kvm, slot->base_gfn, gfn);
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return r;
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}
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static int kvm_iommu_map_memslots(struct kvm *kvm)
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{
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int i, idx, r = 0;
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struct kvm_memslots *slots;
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idx = srcu_read_lock(&kvm->srcu);
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slots = kvm_memslots(kvm);
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for (i = 0; i < slots->nmemslots; i++) {
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r = kvm_iommu_map_pages(kvm, &slots->memslots[i]);
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if (r)
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break;
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}
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srcu_read_unlock(&kvm->srcu, idx);
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return r;
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}
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int kvm_assign_device(struct kvm *kvm,
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struct kvm_assigned_dev_kernel *assigned_dev)
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{
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struct pci_dev *pdev = NULL;
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struct iommu_domain *domain = kvm->arch.iommu_domain;
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int r, last_flags;
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/* check if iommu exists and in use */
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if (!domain)
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return 0;
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pdev = assigned_dev->dev;
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if (pdev == NULL)
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return -ENODEV;
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r = iommu_attach_device(domain, &pdev->dev);
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if (r) {
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printk(KERN_ERR "assign device %x:%x:%x.%x failed",
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pci_domain_nr(pdev->bus),
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pdev->bus->number,
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PCI_SLOT(pdev->devfn),
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PCI_FUNC(pdev->devfn));
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return r;
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}
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last_flags = kvm->arch.iommu_flags;
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if (iommu_domain_has_cap(kvm->arch.iommu_domain,
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IOMMU_CAP_CACHE_COHERENCY))
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kvm->arch.iommu_flags |= KVM_IOMMU_CACHE_COHERENCY;
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/* Check if need to update IOMMU page table for guest memory */
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if ((last_flags ^ kvm->arch.iommu_flags) ==
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KVM_IOMMU_CACHE_COHERENCY) {
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kvm_iommu_unmap_memslots(kvm);
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r = kvm_iommu_map_memslots(kvm);
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if (r)
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goto out_unmap;
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}
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printk(KERN_DEBUG "assign device %x:%x:%x.%x\n",
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assigned_dev->host_segnr,
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assigned_dev->host_busnr,
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PCI_SLOT(assigned_dev->host_devfn),
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PCI_FUNC(assigned_dev->host_devfn));
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return 0;
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out_unmap:
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kvm_iommu_unmap_memslots(kvm);
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return r;
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}
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int kvm_deassign_device(struct kvm *kvm,
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struct kvm_assigned_dev_kernel *assigned_dev)
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{
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struct iommu_domain *domain = kvm->arch.iommu_domain;
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struct pci_dev *pdev = NULL;
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/* check if iommu exists and in use */
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if (!domain)
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return 0;
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pdev = assigned_dev->dev;
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if (pdev == NULL)
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return -ENODEV;
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iommu_detach_device(domain, &pdev->dev);
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printk(KERN_DEBUG "deassign device %x:%x:%x.%x\n",
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assigned_dev->host_segnr,
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assigned_dev->host_busnr,
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PCI_SLOT(assigned_dev->host_devfn),
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PCI_FUNC(assigned_dev->host_devfn));
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return 0;
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}
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int kvm_iommu_map_guest(struct kvm *kvm)
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{
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int r;
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if (!iommu_found()) {
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printk(KERN_ERR "%s: iommu not found\n", __func__);
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return -ENODEV;
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}
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kvm->arch.iommu_domain = iommu_domain_alloc();
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if (!kvm->arch.iommu_domain)
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return -ENOMEM;
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r = kvm_iommu_map_memslots(kvm);
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if (r)
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goto out_unmap;
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return 0;
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out_unmap:
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kvm_iommu_unmap_memslots(kvm);
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return r;
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}
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static void kvm_unpin_pages(struct kvm *kvm, pfn_t pfn, unsigned long npages)
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{
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unsigned long i;
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for (i = 0; i < npages; ++i)
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kvm_release_pfn_clean(pfn + i);
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}
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static void kvm_iommu_put_pages(struct kvm *kvm,
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gfn_t base_gfn, unsigned long npages)
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{
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struct iommu_domain *domain;
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gfn_t end_gfn, gfn;
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pfn_t pfn;
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u64 phys;
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domain = kvm->arch.iommu_domain;
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end_gfn = base_gfn + npages;
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gfn = base_gfn;
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/* check if iommu exists and in use */
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if (!domain)
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return;
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while (gfn < end_gfn) {
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unsigned long unmap_pages;
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int order;
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/* Get physical address */
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phys = iommu_iova_to_phys(domain, gfn_to_gpa(gfn));
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pfn = phys >> PAGE_SHIFT;
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/* Unmap address from IO address space */
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order = iommu_unmap(domain, gfn_to_gpa(gfn), 0);
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unmap_pages = 1ULL << order;
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/* Unpin all pages we just unmapped to not leak any memory */
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kvm_unpin_pages(kvm, pfn, unmap_pages);
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gfn += unmap_pages;
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}
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}
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static int kvm_iommu_unmap_memslots(struct kvm *kvm)
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{
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int i, idx;
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struct kvm_memslots *slots;
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idx = srcu_read_lock(&kvm->srcu);
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slots = kvm_memslots(kvm);
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for (i = 0; i < slots->nmemslots; i++) {
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kvm_iommu_put_pages(kvm, slots->memslots[i].base_gfn,
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slots->memslots[i].npages);
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}
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srcu_read_unlock(&kvm->srcu, idx);
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return 0;
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}
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int kvm_iommu_unmap_guest(struct kvm *kvm)
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{
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struct iommu_domain *domain = kvm->arch.iommu_domain;
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/* check if iommu exists and in use */
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if (!domain)
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return 0;
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kvm_iommu_unmap_memslots(kvm);
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iommu_domain_free(domain);
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return 0;
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}
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