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VFIO updates for v3.15 include:

Browse source 
- Allow the vfio-type1 IOMMU to support multiple domains within a container
 - Plumb path to query whether all domains are cache-coherent
 - Wire query into kvm-vfio device to avoid KVM x86 WBINVD emulation
 - Always select CONFIG_ANON_INODES, vfio depends on it (Arnd)
 
 The first patch also makes the vfio-type1 IOMMU driver completely independent
 of the bus_type of the devices it's handling, which enables it to be used for
 both vfio-pci and a future vfio-platform (and hopefully combinations involving
 both simultaneously).
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Merge tag 'vfio-v3.15-rc1' of git://github.com/awilliam/linux-vfio

Pull VFIO updates from Alex Williamson:
 "VFIO updates for v3.15 include:

   - Allow the vfio-type1 IOMMU to support multiple domains within a
     container
   - Plumb path to query whether all domains are cache-coherent
   - Wire query into kvm-vfio device to avoid KVM x86 WBINVD emulation
   - Always select CONFIG_ANON_INODES, vfio depends on it (Arnd)

  The first patch also makes the vfio-type1 IOMMU driver completely
  independent of the bus_type of the devices it's handling, which
  enables it to be used for both vfio-pci and a future vfio-platform
  (and hopefully combinations involving both simultaneously)"

* tag 'vfio-v3.15-rc1' of git://github.com/awilliam/linux-vfio:
  vfio: always select ANON_INODES
  kvm/vfio: Support for DMA coherent IOMMUs
  vfio: Add external user check extension interface
  vfio/type1: Add extension to test DMA cache coherence of IOMMU
  vfio/iommu_type1: Multi-IOMMU domain support
This commit is contained in:
Linus Torvalds 2014-04-03 14:05:02 -07:00
commit d0cb5f71c5
6 changed files with 390 additions and 308 deletions
Download patch file Download diff file Expand all files Collapse all files

27
virt/kvm/vfio.c
View file

@ -59,6 +59,22 @@ static void kvm_vfio_group_put_external_user(struct vfio_group *vfio_group)
symbol_put(vfio_group_put_external_user);
}
static bool kvm_vfio_group_is_coherent(struct vfio_group *vfio_group)
{
long (*fn)(struct vfio_group *, unsigned long);
long ret;
fn = symbol_get(vfio_external_check_extension);
if (!fn)
return false;
ret = fn(vfio_group, VFIO_DMA_CC_IOMMU);
symbol_put(vfio_external_check_extension);
return ret > 0;
}
/*
* Groups can use the same or different IOMMU domains. If the same then
* adding a new group may change the coherency of groups we've previously
@ -75,13 +91,10 @@ static void kvm_vfio_update_coherency(struct kvm_device *dev)
mutex_lock(&kv->lock);
list_for_each_entry(kvg, &kv->group_list, node) {
/*
* TODO: We need an interface to check the coherency of
* the IOMMU domain this group is using. For now, assume
* it's always noncoherent.
*/
noncoherent = true;
break;
if (!kvm_vfio_group_is_coherent(kvg->vfio_group)) {
noncoherent = true;
break;
}
}
if (noncoherent != kv->noncoherent) {