KVM: enable PCI multiple-segments for pass-through device

Enable optional parameter (default 0) - PCI segment (or domain) besides
BDF, when assigning PCI device to guest.

Signed-off-by: Zhai Edwin <edwin.zhai@intel.com>
Acked-by: Chris Wright <chrisw@sous-sol.org>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>

5 files changed, 14 insertions, 5 deletions

diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index d47ceda7a928..0bf3df527afc 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -1569,6 +1569,7 @@ int kvm_dev_ioctl_check_extension(long ext)
         case KVM_CAP_HYPERV:
         case KVM_CAP_HYPERV_VAPIC:
         case KVM_CAP_HYPERV_SPIN:
+        case KVM_CAP_PCI_SEGMENT:
                 r = 1;
                 break;
         case KVM_CAP_COALESCED_MMIO:
diff --git a/include/linux/kvm.h b/include/linux/kvm.h
index 4c4937e7f65f..dfa54be881f4 100644
--- a/include/linux/kvm.h
+++ b/include/linux/kvm.h
@@ -500,6 +500,7 @@ struct kvm_ioeventfd {
 #define KVM_CAP_HYPERV 44
 #define KVM_CAP_HYPERV_VAPIC 45
 #define KVM_CAP_HYPERV_SPIN 46
+#define KVM_CAP_PCI_SEGMENT 47
 
 #ifdef KVM_CAP_IRQ_ROUTING
 
@@ -694,8 +695,9 @@ struct kvm_assigned_pci_dev {
         __u32 busnr;
         __u32 devfn;
         __u32 flags;
+        __u32 segnr;
         union {
-                __u32 reserved[12];
+                __u32 reserved[11];
         };
 };
 
diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h
index dfde04b0d453..665c37063f30 100644
--- a/include/linux/kvm_host.h
+++ b/include/linux/kvm_host.h
@@ -400,6 +400,7 @@ struct kvm_assigned_dev_kernel {
         struct work_struct interrupt_work;
         struct list_head list;
         int assigned_dev_id;
+        int host_segnr;
         int host_busnr;
         int host_devfn;
         unsigned int entries_nr;
diff --git a/virt/kvm/assigned-dev.c b/virt/kvm/assigned-dev.c
index f51e684dd238..057e2cca6af5 100644
--- a/virt/kvm/assigned-dev.c
+++ b/virt/kvm/assigned-dev.c
@@ -526,7 +526,8 @@ static int kvm_vm_ioctl_assign_device(struct kvm *kvm,
                 r = -ENOMEM;
                 goto out;
         }
-        dev = pci_get_bus_and_slot(assigned_dev->busnr,
+        dev = pci_get_domain_bus_and_slot(assigned_dev->segnr,
+                                   assigned_dev->busnr,
                                    assigned_dev->devfn);
         if (!dev) {
                 printk(KERN_INFO "%s: host device not found\n", __func__);
@@ -548,6 +549,7 @@ static int kvm_vm_ioctl_assign_device(struct kvm *kvm,
         pci_reset_function(dev);
 
         match->assigned_dev_id = assigned_dev->assigned_dev_id;
+        match->host_segnr = assigned_dev->segnr;
         match->host_busnr = assigned_dev->busnr;
         match->host_devfn = assigned_dev->devfn;
         match->flags = assigned_dev->flags;
diff --git a/virt/kvm/iommu.c b/virt/kvm/iommu.c
index 65a51432c8e5..80fd3ad3b2de 100644
--- a/virt/kvm/iommu.c
+++ b/virt/kvm/iommu.c
@@ -106,7 +106,8 @@ int kvm_assign_device(struct kvm *kvm,
 
         r = iommu_attach_device(domain, &pdev->dev);
         if (r) {
-                printk(KERN_ERR "assign device %x:%x.%x failed",
+                printk(KERN_ERR "assign device %x:%x:%x.%x failed",
+                        pci_domain_nr(pdev->bus),
                         pdev->bus->number,
                         PCI_SLOT(pdev->devfn),
                         PCI_FUNC(pdev->devfn));
@@ -127,7 +128,8 @@ int kvm_assign_device(struct kvm *kvm,
                         goto out_unmap;
         }
 
-        printk(KERN_DEBUG "assign device: host bdf = %x:%x:%x\n",
+        printk(KERN_DEBUG "assign device %x:%x:%x.%x\n",
+                assigned_dev->host_segnr,
                 assigned_dev->host_busnr,
                 PCI_SLOT(assigned_dev->host_devfn),
                 PCI_FUNC(assigned_dev->host_devfn));
@@ -154,7 +156,8 @@ int kvm_deassign_device(struct kvm *kvm,
 
         iommu_detach_device(domain, &pdev->dev);
 
-        printk(KERN_DEBUG "deassign device: host bdf = %x:%x:%x\n",
+        printk(KERN_DEBUG "deassign device %x:%x:%x.%x\n",
+                assigned_dev->host_segnr,
                 assigned_dev->host_busnr,
                 PCI_SLOT(assigned_dev->host_devfn),
                 PCI_FUNC(assigned_dev->host_devfn));