mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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371c01b28e
Preparation for kvm/ia64 VT-d support. Signed-off-by: Zhang xiantao <xiantao.zhang@intel.com> Signed-off-by: Avi Kivity <avi@qumranet.com>
192 lines
4.7 KiB
C
192 lines
4.7 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/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 dmar_domain *domain = kvm->arch.intel_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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for (i = 0; i < npages; i++) {
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/* check if already mapped */
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pfn = (pfn_t)intel_iommu_iova_to_pfn(domain,
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gfn_to_gpa(gfn));
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if (pfn)
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continue;
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pfn = gfn_to_pfn(kvm, gfn);
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r = intel_iommu_page_mapping(domain,
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gfn_to_gpa(gfn),
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pfn_to_hpa(pfn),
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PAGE_SIZE,
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DMA_PTE_READ |
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DMA_PTE_WRITE);
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if (r) {
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printk(KERN_ERR "kvm_iommu_map_pages:"
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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;
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down_read(&kvm->slots_lock);
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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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up_read(&kvm->slots_lock);
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return r;
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}
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int kvm_iommu_map_guest(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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int r;
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if (!intel_iommu_found()) {
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printk(KERN_ERR "%s: intel iommu not found\n", __func__);
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return -ENODEV;
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}
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printk(KERN_DEBUG "VT-d direct map: 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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pdev = assigned_dev->dev;
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if (pdev == NULL) {
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if (kvm->arch.intel_iommu_domain) {
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intel_iommu_domain_exit(kvm->arch.intel_iommu_domain);
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kvm->arch.intel_iommu_domain = NULL;
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}
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return -ENODEV;
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}
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kvm->arch.intel_iommu_domain = intel_iommu_domain_alloc(pdev);
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if (!kvm->arch.intel_iommu_domain)
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return -ENODEV;
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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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intel_iommu_detach_dev(kvm->arch.intel_iommu_domain,
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pdev->bus->number, pdev->devfn);
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r = intel_iommu_context_mapping(kvm->arch.intel_iommu_domain,
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pdev);
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if (r) {
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printk(KERN_ERR "Domain context map for %s failed",
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pci_name(pdev));
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goto out_unmap;
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}
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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 dmar_domain *domain = kvm->arch.intel_iommu_domain;
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int i;
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for (i = 0; i < npages; i++) {
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pfn = (pfn_t)intel_iommu_iova_to_pfn(domain,
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gfn_to_gpa(gfn));
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kvm_release_pfn_clean(pfn);
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gfn++;
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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;
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down_read(&kvm->slots_lock);
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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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up_read(&kvm->slots_lock);
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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 kvm_assigned_dev_kernel *entry;
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struct dmar_domain *domain = kvm->arch.intel_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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list_for_each_entry(entry, &kvm->arch.assigned_dev_head, list) {
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printk(KERN_DEBUG "VT-d unmap: host bdf = %x:%x:%x\n",
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entry->host_busnr,
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PCI_SLOT(entry->host_devfn),
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PCI_FUNC(entry->host_devfn));
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/* detach kvm dmar domain */
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intel_iommu_detach_dev(domain, entry->host_busnr,
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entry->host_devfn);
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}
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kvm_iommu_unmap_memslots(kvm);
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intel_iommu_domain_exit(domain);
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return 0;
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}
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