int kvm_iommu_map_guest(struct kvm *kvm)
{
int r;
if (!iommu_found()) {
printk(KERN_ERR "%s: iommu not found\n", __func__);
return -ENODEV;
}
kvm->arch.iommu_domain = iommu_domain_alloc();
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;
return 0;
out_unmap:
kvm_iommu_unmap_memslots(kvm);
return r;
}
int kvm_assign_device(struct kvm *kvm,
struct kvm_assigned_dev_kernel *assigned_dev)
{
struct pci_dev *pdev = NULL;
struct iommu_domain *domain = kvm->arch.iommu_domain;
int r, last_flags;
/* check if iommu exists and in use */
if (!domain)
return 0;
pdev = assigned_dev->dev;
if (pdev == NULL)
return -ENODEV;
r = iommu_attach_device(domain, &pdev->dev);
if (r) {
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));
return r;
}
last_flags = kvm->arch.iommu_flags;
if (iommu_domain_has_cap(kvm->arch.iommu_domain,
IOMMU_CAP_CACHE_COHERENCY))
kvm->arch.iommu_flags |= KVM_IOMMU_CACHE_COHERENCY;
/* Check if need to update IOMMU page table for guest memory */
if ((last_flags ^ kvm->arch.iommu_flags) ==
KVM_IOMMU_CACHE_COHERENCY) {
kvm_iommu_unmap_memslots(kvm);
r = kvm_iommu_map_memslots(kvm);
if (r)
goto out_unmap;
}
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));
return 0;
out_unmap:
kvm_iommu_unmap_memslots(kvm);
return r;
}
int kvm_iommu_map_guest(struct kvm *kvm)
{
int r;
if (!iommu_found()) {
printk(KERN_ERR "%s: iommu not found\n", __func__);
return -ENODEV;
}
kvm->arch.iommu_domain = iommu_domain_alloc();
if (!kvm->arch.iommu_domain)
return -ENOMEM;
r = kvm_iommu_map_memslots(kvm);
if (r)
goto out_unmap;
return 0;
out_unmap:
kvm_iommu_unmap_memslots(kvm);
return r;
}
