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authorJoerg Roedel <joerg.roedel@amd.com>2008-11-26 15:51:19 +0100
committerJoerg Roedel <joerg.roedel@amd.com>2009-01-03 14:10:09 +0100
commitc4fa3864281c7d88b7262cbc6cbd5c90bb59860e (patch)
tree21209dceb4d978e24a009b848115d0d8bea0cbcc /virt/kvm/iommu.c
parentb653574a7d14b663cc812cb20be6a114939ba186 (diff)
downloadlinux-c4fa3864281c7d88b7262cbc6cbd5c90bb59860e.tar.gz
KVM: rename vtd.c to iommu.c
Impact: file renamed The code in the vtd.c file can be reused for other IOMMUs as well. So rename it to make it clear that it handle more than VT-d. Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
Diffstat (limited to 'virt/kvm/iommu.c')
-rw-r--r--virt/kvm/iommu.c217
1 files changed, 217 insertions, 0 deletions
diff --git a/virt/kvm/iommu.c b/virt/kvm/iommu.c
new file mode 100644
index 00000000000..d46de9af838
--- /dev/null
+++ b/virt/kvm/iommu.c
@@ -0,0 +1,217 @@
+/*
+ * 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 */
+ if (intel_iommu_iova_to_phys(domain,
+ gfn_to_gpa(gfn)))
+ continue;
+
+ pfn = gfn_to_pfn(kvm, gfn);
+ r = intel_iommu_map_address(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_address:"
+ "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_assign_device(struct kvm *kvm,
+ struct kvm_assigned_dev_kernel *assigned_dev)
+{
+ struct pci_dev *pdev = NULL;
+ struct dmar_domain *domain = kvm->arch.intel_iommu_domain;
+ int r;
+
+ /* check if iommu exists and in use */
+ if (!domain)
+ return 0;
+
+ pdev = assigned_dev->dev;
+ if (pdev == NULL)
+ return -ENODEV;
+
+ r = intel_iommu_attach_device(domain, pdev);
+ if (r) {
+ printk(KERN_ERR "assign device %x:%x.%x failed",
+ pdev->bus->number,
+ PCI_SLOT(pdev->devfn),
+ PCI_FUNC(pdev->devfn));
+ return r;
+ }
+
+ printk(KERN_DEBUG "assign device: host bdf = %x:%x:%x\n",
+ assigned_dev->host_busnr,
+ PCI_SLOT(assigned_dev->host_devfn),
+ PCI_FUNC(assigned_dev->host_devfn));
+
+ return 0;
+}
+
+int kvm_deassign_device(struct kvm *kvm,
+ struct kvm_assigned_dev_kernel *assigned_dev)
+{
+ struct dmar_domain *domain = kvm->arch.intel_iommu_domain;
+ struct pci_dev *pdev = NULL;
+
+ /* check if iommu exists and in use */
+ if (!domain)
+ return 0;
+
+ pdev = assigned_dev->dev;
+ if (pdev == NULL)
+ return -ENODEV;
+
+ intel_iommu_detach_device(domain, pdev);
+
+ printk(KERN_DEBUG "deassign device: host bdf = %x:%x:%x\n",
+ assigned_dev->host_busnr,
+ PCI_SLOT(assigned_dev->host_devfn),
+ PCI_FUNC(assigned_dev->host_devfn));
+
+ return 0;
+}
+
+int kvm_iommu_map_guest(struct kvm *kvm)
+{
+ int r;
+
+ if (!intel_iommu_found()) {
+ printk(KERN_ERR "%s: intel iommu not found\n", __func__);
+ return -ENODEV;
+ }
+
+ kvm->arch.intel_iommu_domain = intel_iommu_alloc_domain();
+ if (!kvm->arch.intel_iommu_domain)
+ return -ENOMEM;
+
+ r = kvm_iommu_map_memslots(kvm);
+ if (r)
+ 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;
+ unsigned long i;
+ u64 phys;
+
+ /* check if iommu exists and in use */
+ if (!domain)
+ return;
+
+ for (i = 0; i < npages; i++) {
+ phys = intel_iommu_iova_to_phys(domain,
+ gfn_to_gpa(gfn));
+ pfn = phys >> PAGE_SHIFT;
+ kvm_release_pfn_clean(pfn);
+ gfn++;
+ }
+
+ intel_iommu_unmap_address(domain,
+ gfn_to_gpa(base_gfn),
+ PAGE_SIZE * npages);
+}
+
+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 dmar_domain *domain = kvm->arch.intel_iommu_domain;
+
+ /* check if iommu exists and in use */
+ if (!domain)
+ return 0;
+
+ kvm_iommu_unmap_memslots(kvm);
+ intel_iommu_free_domain(domain);
+ return 0;
+}