Merge branch 'kvm-updates/3.1' of git://git.kernel.org/pub/scm/virt/kvm/kvm

* 'kvm-updates/3.1' of git://git.kernel.org/pub/scm/virt/kvm/kvm: (143 commits)
  KVM: IOMMU: Disable device assignment without interrupt remapping
  KVM: MMU: trace mmio page fault
  KVM: MMU: mmio page fault support
  KVM: MMU: reorganize struct kvm_shadow_walk_iterator
  KVM: MMU: lockless walking shadow page table
  KVM: MMU: do not need atomicly to set/clear spte
  KVM: MMU: introduce the rules to modify shadow page table
  KVM: MMU: abstract some functions to handle fault pfn
  KVM: MMU: filter out the mmio pfn from the fault pfn
  KVM: MMU: remove bypass_guest_pf
  KVM: MMU: split kvm_mmu_free_page
  KVM: MMU: count used shadow pages on prepareing path
  KVM: MMU: rename 'pt_write' to 'emulate'
  KVM: MMU: cleanup for FNAME(fetch)
  KVM: MMU: optimize to handle dirty bit
  KVM: MMU: cache mmio info on page fault path
  KVM: x86: introduce vcpu_mmio_gva_to_gpa to cleanup the code
  KVM: MMU: do not update slot bitmap if spte is nonpresent
  KVM: MMU: fix walking shadow page table
  KVM guest: KVM Steal time registration
  ...

1 files changed, 18 insertions, 0 deletions

diff --git a/virt/kvm/iommu.c b/virt/kvm/iommu.c
index 62a9caf0563c..78c80f67f535 100644
--- a/virt/kvm/iommu.c
+++ b/virt/kvm/iommu.c
@@ -30,6 +30,12 @@
 #include <linux/iommu.h>
 #include <linux/intel-iommu.h>
 
+static int allow_unsafe_assigned_interrupts;
+module_param_named(allow_unsafe_assigned_interrupts,
+                   allow_unsafe_assigned_interrupts, bool, S_IRUGO | S_IWUSR);
+MODULE_PARM_DESC(allow_unsafe_assigned_interrupts,
+ "Enable device assignment on platforms without interrupt remapping support.");
+
 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);
@@ -231,6 +237,18 @@ int kvm_iommu_map_guest(struct kvm *kvm)
         if (!kvm->arch.iommu_domain)
                 return -ENOMEM;
 
+        if (!allow_unsafe_assigned_interrupts &&
+            !iommu_domain_has_cap(kvm->arch.iommu_domain,
+                                  IOMMU_CAP_INTR_REMAP)) {
+                printk(KERN_WARNING "%s: No interrupt remapping support,"
+                       " disallowing device assignment."
+                       " Re-enble with \"allow_unsafe_assigned_interrupts=1\""
+                       " module option.\n", __func__);
+                iommu_domain_free(kvm->arch.iommu_domain);
+                kvm->arch.iommu_domain = NULL;
+                return -EPERM;
+        }
+
         r = kvm_iommu_map_memslots(kvm);
         if (r)
                 goto out_unmap;