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-rw-r--r--virt/kvm/iommu.c18
1 files changed, 18 insertions, 0 deletions
diff --git a/virt/kvm/iommu.c b/virt/kvm/iommu.c
index 62a9caf..78c80f6 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;
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