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authorZhang xiantao <xiantao.zhang@intel.com>2008-09-11 13:19:32 +0800
committerAvi Kivity <avi@redhat.com>2008-10-15 14:25:32 +0200
commit371c01b28e4049d1fbf60a9631cdad98f7cae030 (patch)
tree84286c5292b404923d8cf730e06d52a332468da6 /virt
parent83dbc83a0d7c88c919d769177bd1924a46c9c034 (diff)
downloadlinux-linaro-stable-371c01b28e4049d1fbf60a9631cdad98f7cae030.tar.gz
KVM: Device Assignment: Move vtd.c from arch/x86/kvm/ to virt/kvm/
Preparation for kvm/ia64 VT-d support. Signed-off-by: Zhang xiantao <xiantao.zhang@intel.com> Signed-off-by: Avi Kivity <avi@qumranet.com>
Diffstat (limited to 'virt')
-rw-r--r--virt/kvm/vtd.c191
1 files changed, 191 insertions, 0 deletions
diff --git a/virt/kvm/vtd.c b/virt/kvm/vtd.c
new file mode 100644
index 000000000000..a770874f3a3a
--- /dev/null
+++ b/virt/kvm/vtd.c
@@ -0,0 +1,191 @@
+/*
+ * Copyright (c) 2006, Intel Corporation.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * this program; if not, write to the Free Software Foundation, Inc., 59 Temple
+ * Place - Suite 330, Boston, MA 02111-1307 USA.
+ *
+ * Copyright (C) 2006-2008 Intel Corporation
+ * Copyright IBM Corporation, 2008
+ * Author: Allen M. Kay <allen.m.kay@intel.com>
+ * Author: Weidong Han <weidong.han@intel.com>
+ * Author: Ben-Ami Yassour <benami@il.ibm.com>
+ */
+
+#include <linux/list.h>
+#include <linux/kvm_host.h>
+#include <linux/pci.h>
+#include <linux/dmar.h>
+#include <linux/intel-iommu.h>
+
+static int kvm_iommu_unmap_memslots(struct kvm *kvm);
+static void kvm_iommu_put_pages(struct kvm *kvm,
+ gfn_t base_gfn, unsigned long npages);
+
+int kvm_iommu_map_pages(struct kvm *kvm,
+ gfn_t base_gfn, unsigned long npages)
+{
+ gfn_t gfn = base_gfn;
+ pfn_t pfn;
+ int i, r = 0;
+ struct dmar_domain *domain = kvm->arch.intel_iommu_domain;
+
+ /* check if iommu exists and in use */
+ if (!domain)
+ return 0;
+
+ for (i = 0; i < npages; i++) {
+ /* check if already mapped */
+ pfn = (pfn_t)intel_iommu_iova_to_pfn(domain,
+ gfn_to_gpa(gfn));
+ if (pfn)
+ continue;
+
+ pfn = gfn_to_pfn(kvm, gfn);
+ r = intel_iommu_page_mapping(domain,
+ gfn_to_gpa(gfn),
+ pfn_to_hpa(pfn),
+ PAGE_SIZE,
+ DMA_PTE_READ |
+ DMA_PTE_WRITE);
+ if (r) {
+ printk(KERN_ERR "kvm_iommu_map_pages:"
+ "iommu failed to map pfn=%lx\n", pfn);
+ goto unmap_pages;
+ }
+ gfn++;
+ }
+ return 0;
+
+unmap_pages:
+ kvm_iommu_put_pages(kvm, base_gfn, i);
+ return r;
+}
+
+static int kvm_iommu_map_memslots(struct kvm *kvm)
+{
+ int i, r;
+
+ down_read(&kvm->slots_lock);
+ for (i = 0; i < kvm->nmemslots; i++) {
+ r = kvm_iommu_map_pages(kvm, kvm->memslots[i].base_gfn,
+ kvm->memslots[i].npages);
+ if (r)
+ break;
+ }
+ up_read(&kvm->slots_lock);
+ return r;
+}
+
+int kvm_iommu_map_guest(struct kvm *kvm,
+ struct kvm_assigned_dev_kernel *assigned_dev)
+{
+ struct pci_dev *pdev = NULL;
+ int r;
+
+ if (!intel_iommu_found()) {
+ printk(KERN_ERR "%s: intel iommu not found\n", __func__);
+ return -ENODEV;
+ }
+
+ printk(KERN_DEBUG "VT-d direct map: host bdf = %x:%x:%x\n",
+ assigned_dev->host_busnr,
+ PCI_SLOT(assigned_dev->host_devfn),
+ PCI_FUNC(assigned_dev->host_devfn));
+
+ pdev = assigned_dev->dev;
+
+ if (pdev == NULL) {
+ if (kvm->arch.intel_iommu_domain) {
+ intel_iommu_domain_exit(kvm->arch.intel_iommu_domain);
+ kvm->arch.intel_iommu_domain = NULL;
+ }
+ return -ENODEV;
+ }
+
+ kvm->arch.intel_iommu_domain = intel_iommu_domain_alloc(pdev);
+ if (!kvm->arch.intel_iommu_domain)
+ return -ENODEV;
+
+ r = kvm_iommu_map_memslots(kvm);
+ if (r)
+ goto out_unmap;
+
+ intel_iommu_detach_dev(kvm->arch.intel_iommu_domain,
+ pdev->bus->number, pdev->devfn);
+
+ r = intel_iommu_context_mapping(kvm->arch.intel_iommu_domain,
+ pdev);
+ if (r) {
+ printk(KERN_ERR "Domain context map for %s failed",
+ pci_name(pdev));
+ goto out_unmap;
+ }
+ return 0;
+
+out_unmap:
+ kvm_iommu_unmap_memslots(kvm);
+ return r;
+}
+
+static void kvm_iommu_put_pages(struct kvm *kvm,
+ gfn_t base_gfn, unsigned long npages)
+{
+ gfn_t gfn = base_gfn;
+ pfn_t pfn;
+ struct dmar_domain *domain = kvm->arch.intel_iommu_domain;
+ int i;
+
+ for (i = 0; i < npages; i++) {
+ pfn = (pfn_t)intel_iommu_iova_to_pfn(domain,
+ gfn_to_gpa(gfn));
+ kvm_release_pfn_clean(pfn);
+ gfn++;
+ }
+}
+
+static int kvm_iommu_unmap_memslots(struct kvm *kvm)
+{
+ int i;
+ down_read(&kvm->slots_lock);
+ for (i = 0; i < kvm->nmemslots; i++) {
+ kvm_iommu_put_pages(kvm, kvm->memslots[i].base_gfn,
+ kvm->memslots[i].npages);
+ }
+ up_read(&kvm->slots_lock);
+
+ return 0;
+}
+
+int kvm_iommu_unmap_guest(struct kvm *kvm)
+{
+ struct kvm_assigned_dev_kernel *entry;
+ struct dmar_domain *domain = kvm->arch.intel_iommu_domain;
+
+ /* check if iommu exists and in use */
+ if (!domain)
+ return 0;
+
+ list_for_each_entry(entry, &kvm->arch.assigned_dev_head, list) {
+ printk(KERN_DEBUG "VT-d unmap: host bdf = %x:%x:%x\n",
+ entry->host_busnr,
+ PCI_SLOT(entry->host_devfn),
+ PCI_FUNC(entry->host_devfn));
+
+ /* detach kvm dmar domain */
+ intel_iommu_detach_dev(domain, entry->host_busnr,
+ entry->host_devfn);
+ }
+ kvm_iommu_unmap_memslots(kvm);
+ intel_iommu_domain_exit(domain);
+ return 0;
+}