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![Sheng Yang](/assets/img/avatar_default.png)
Memory aliases with different memory type is a problem for guest. For the guest without assigned device, the memory type of guest memory would always been the same as host(WB); but for the assigned device, some part of memory may be used as DMA and then set to uncacheable memory type(UC/WC), which would be a conflict of host memory type then be a potential issue. Snooping control can guarantee the cache correctness of memory go through the DMA engine of VT-d. [avi: fix build on ia64] Signed-off-by: Sheng Yang <sheng@linux.intel.com> Signed-off-by: Avi Kivity <avi@redhat.com>
233 lines
5.3 KiB
C
233 lines
5.3 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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* 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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int kvm_iommu_map_pages(struct kvm *kvm,
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gfn_t base_gfn, unsigned long npages)
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{
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gfn_t gfn = base_gfn;
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pfn_t pfn;
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int i, 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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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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for (i = 0; i < npages; i++) {
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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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continue;
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pfn = gfn_to_pfn(kvm, gfn);
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r = iommu_map_range(domain,
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gfn_to_gpa(gfn),
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pfn_to_hpa(pfn),
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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=%lx\n", pfn);
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goto unmap_pages;
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}
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gfn++;
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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, base_gfn, i);
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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, r = 0;
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for (i = 0; i < kvm->nmemslots; i++) {
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r = kvm_iommu_map_pages(kvm, kvm->memslots[i].base_gfn,
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kvm->memslots[i].npages);
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if (r)
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break;
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}
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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 failed",
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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: host bdf = %x:%x:%x\n",
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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: host bdf = %x:%x:%x\n",
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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_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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gfn_t gfn = base_gfn;
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pfn_t pfn;
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struct iommu_domain *domain = kvm->arch.iommu_domain;
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unsigned long i;
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u64 phys;
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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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for (i = 0; i < npages; i++) {
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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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kvm_release_pfn_clean(pfn);
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gfn++;
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}
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iommu_unmap_range(domain, gfn_to_gpa(base_gfn), PAGE_SIZE * npages);
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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;
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for (i = 0; i < kvm->nmemslots; i++) {
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kvm_iommu_put_pages(kvm, kvm->memslots[i].base_gfn,
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kvm->memslots[i].npages);
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}
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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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