KVM: pci device assignment

Based on a patch from: Amit Shah <amit.shah@qumranet.com>

This patch adds support for handling PCI devices that are assigned to
the guest.

The device to be assigned to the guest is registered in the host kernel
and interrupt delivery is handled.  If a device is already assigned, or
the device driver for it is still loaded on the host, the device
assignment is failed by conveying a -EBUSY reply to the userspace.

Devices that share their interrupt line are not supported at the moment.

By itself, this patch will not make devices work within the guest.
The VT-d extension is required to enable the device to perform DMA.
Another alternative is PVDMA.

Signed-off-by: Amit Shah <amit.shah@qumranet.com>
Signed-off-by: Ben-Ami Yassour <benami@il.ibm.com>
Signed-off-by: Weidong Han <weidong.han@intel.com>
Signed-off-by: Avi Kivity <avi@qumranet.com>

1 files changed, 16 insertions, 0 deletions

diff --git a/include/asm-x86/kvm_host.h b/include/asm-x86/kvm_host.h
index d451928fc841..99dddfcecf60 100644
--- a/include/asm-x86/kvm_host.h
+++ b/include/asm-x86/kvm_host.h
@@ -327,6 +327,21 @@ struct kvm_irq_ack_notifier {
         void (*irq_acked)(struct kvm_irq_ack_notifier *kian);
 };
 
+struct kvm_assigned_dev_kernel {
+        struct kvm_irq_ack_notifier ack_notifier;
+        struct work_struct interrupt_work;
+        struct list_head list;
+        struct kvm_assigned_pci_dev assigned_dev;
+        int assigned_dev_id;
+        int host_busnr;
+        int host_devfn;
+        int host_irq;
+        int guest_irq;
+        int irq_requested;
+        struct pci_dev *dev;
+        struct kvm *kvm;
+};
+
 struct kvm_arch{
         int naliases;
         struct kvm_mem_alias aliases[KVM_ALIAS_SLOTS];
@@ -339,6 +354,7 @@ struct kvm_arch{
          * Hash table of struct kvm_mmu_page.
          */
         struct list_head active_mmu_pages;
+        struct list_head assigned_dev_head;
         struct kvm_pic *vpic;
         struct kvm_ioapic *vioapic;
         struct kvm_pit *vpit;