KVM: use the new intel iommu APIs

intel iommu APIs are updated, use the new APIs.

In addition, change kvm_iommu_map_guest() to just create the domain, let kvm_iommu_assign_device() assign device.

Signed-off-by: Weidong Han <weidong.han@intel.com>
Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>

3 files changed, 71 insertions, 49 deletions

diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h
index eafabd5c66b2..c96739b4b7a3 100644
--- a/include/linux/kvm_host.h
+++ b/include/linux/kvm_host.h
@@ -330,9 +330,10 @@ void kvm_free_irq_source_id(struct kvm *kvm, int irq_source_id);
 #ifdef CONFIG_DMAR
 int kvm_iommu_map_pages(struct kvm *kvm, gfn_t base_gfn,
                         unsigned long npages);
-int kvm_iommu_map_guest(struct kvm *kvm,
-                        struct kvm_assigned_dev_kernel *assigned_dev);
+int kvm_iommu_map_guest(struct kvm *kvm);
 int kvm_iommu_unmap_guest(struct kvm *kvm);
+int kvm_assign_device(struct kvm *kvm,
+                      struct kvm_assigned_dev_kernel *assigned_dev);
 #else /* CONFIG_DMAR */
 static inline int kvm_iommu_map_pages(struct kvm *kvm,
                                       gfn_t base_gfn,
@@ -341,9 +342,7 @@ static inline int kvm_iommu_map_pages(struct kvm *kvm,
         return 0;
 }
 
-static inline int kvm_iommu_map_guest(struct kvm *kvm,
-                                      struct kvm_assigned_dev_kernel
-                                      *assigned_dev)
+static inline int kvm_iommu_map_guest(struct kvm *kvm)
 {
         return -ENODEV;
 }
@@ -352,6 +351,12 @@ static inline int kvm_iommu_unmap_guest(struct kvm *kvm)
 {
         return 0;
 }
+
+static inline int kvm_assign_device(struct kvm *kvm,
+                struct kvm_assigned_dev_kernel *assigned_dev)
+{
+        return 0;
+}
 #endif /* CONFIG_DMAR */
 
 static inline void kvm_guest_enter(void)
diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
index fc6127cbea1f..c92b63462b79 100644
--- a/virt/kvm/kvm_main.c
+++ b/virt/kvm/kvm_main.c
@@ -503,7 +503,12 @@ static int kvm_vm_ioctl_assign_device(struct kvm *kvm,
         list_add(&match->list, &kvm->arch.assigned_dev_head);
 
         if (assigned_dev->flags & KVM_DEV_ASSIGN_ENABLE_IOMMU) {
-                r = kvm_iommu_map_guest(kvm, match);
+                if (!kvm->arch.intel_iommu_domain) {
+                        r = kvm_iommu_map_guest(kvm);
+                        if (r)
+                                goto out_list_del;
+                }
+                r = kvm_assign_device(kvm, match);
                 if (r)
                         goto out_list_del;
         }
diff --git a/virt/kvm/vtd.c b/virt/kvm/vtd.c
index a770874f3a3a..44bb58a395a5 100644
--- a/virt/kvm/vtd.c
+++ b/virt/kvm/vtd.c
@@ -45,20 +45,18 @@ int kvm_iommu_map_pages(struct kvm *kvm,
 
         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)
+                if (intel_iommu_iova_to_phys(domain,
+                                             gfn_to_gpa(gfn)))
                         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);
+                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_pages:"
+                        printk(KERN_ERR "kvm_iommu_map_address:"
                                "iommu failed to map pfn=%lx\n", pfn);
                         goto unmap_pages;
                 }
@@ -86,50 +84,55 @@ static int kvm_iommu_map_memslots(struct kvm *kvm)
         return r;
 }
 
-int kvm_iommu_map_guest(struct kvm *kvm,
-                        struct kvm_assigned_dev_kernel *assigned_dev)
+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;
 
-        if (!intel_iommu_found()) {
-                printk(KERN_ERR "%s: intel iommu not found\n", __func__);
+        /* 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 "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));
+        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));
 
-        pdev = assigned_dev->dev;
+        return 0;
+}
 
-        if (pdev == NULL) {
-                if (kvm->arch.intel_iommu_domain) {
-                        intel_iommu_domain_exit(kvm->arch.intel_iommu_domain);
-                        kvm->arch.intel_iommu_domain = NULL;
-                }
+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_domain_alloc(pdev);
+        kvm->arch.intel_iommu_domain = intel_iommu_alloc_domain();
         if (!kvm->arch.intel_iommu_domain)
-                return -ENODEV;
+                return -ENOMEM;
 
         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:
@@ -138,19 +141,29 @@ out_unmap:
 }
 
 static void kvm_iommu_put_pages(struct kvm *kvm,
-                               gfn_t base_gfn, unsigned long npages)
+                                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;
+        unsigned long i;
+        u64 phys;
+
+        /* check if iommu exists and in use */
+        if (!domain)
+                return;
 
         for (i = 0; i < npages; i++) {
-                pfn = (pfn_t)intel_iommu_iova_to_pfn(domain,
-                                                     gfn_to_gpa(gfn));
+                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)
@@ -182,10 +195,9 @@ int kvm_iommu_unmap_guest(struct kvm *kvm)
                        PCI_FUNC(entry->host_devfn));
 
                 /* detach kvm dmar domain */
-                intel_iommu_detach_dev(domain, entry->host_busnr,
-                                       entry->host_devfn);
+                intel_iommu_detach_device(domain, entry->dev);
         }
         kvm_iommu_unmap_memslots(kvm);
-        intel_iommu_domain_exit(domain);
+        intel_iommu_free_domain(domain);
         return 0;
 }