KVM: Device Assignment with VT-d

Based on a patch by: Kay, Allen M <allen.m.kay@intel.com>

This patch enables PCI device assignment based on VT-d support.
When a device is assigned to the guest, the guest memory is pinned and
the mapping is updated in the VT-d IOMMU.

[Amit: Expose KVM_CAP_IOMMU so we can check if an IOMMU is present
and also control enable/disable from userspace]

Signed-off-by: Kay, Allen M <allen.m.kay@intel.com>
Signed-off-by: Weidong Han <weidong.han@intel.com>
Signed-off-by: Ben-Ami Yassour <benami@il.ibm.com>
Signed-off-by: Amit Shah <amit.shah@qumranet.com>

Acked-by: Mark Gross <mgross@linux.intel.com>
Signed-off-by: Avi Kivity <avi@qumranet.com>

1 files changed, 3 insertions, 20 deletions

diff --git a/include/asm-x86/kvm_host.h b/include/asm-x86/kvm_host.h
index 68a3ac13afce..805629c0f15f 100644
--- a/include/asm-x86/kvm_host.h
+++ b/include/asm-x86/kvm_host.h
@@ -331,26 +331,6 @@ struct kvm_mem_alias {
         gfn_t target_gfn;
 };
 
-struct kvm_irq_ack_notifier {
-        struct hlist_node link;
-        unsigned gsi;
-        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;
-        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];
@@ -364,6 +344,7 @@ struct kvm_arch{
          */
         struct list_head active_mmu_pages;
         struct list_head assigned_dev_head;
+        struct dmar_domain *intel_iommu_domain;
         struct kvm_pic *vpic;
         struct kvm_ioapic *vioapic;
         struct kvm_pit *vpit;
@@ -514,6 +495,8 @@ int emulator_write_phys(struct kvm_vcpu *vcpu, gpa_t gpa,
 int kvm_pv_mmu_op(struct kvm_vcpu *vcpu, unsigned long bytes,
                   gpa_t addr, unsigned long *ret);
 
+int is_mmio_pfn(pfn_t pfn);
+
 extern bool tdp_enabled;
 
 enum emulation_result {