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authorAlex Williamson <alex.williamson@redhat.com>2013-10-30 11:02:23 -0600
committerPaolo Bonzini <pbonzini@redhat.com>2013-10-30 19:02:13 +0100
commitd96eb2c6f480769bff32054e78b964860dae4d56 (patch)
tree48245bcee8cd688c11c2974c4a0c7391660dd423 /virt
parentec53500fae421e07c5d035918ca454a429732ef4 (diff)
downloadlinux-d96eb2c6f480769bff32054e78b964860dae4d56.tar.gz
kvm/x86: Convert iommu_flags to iommu_noncoherent
Default to operating in coherent mode. This simplifies the logic when we switch to a model of registering and unregistering noncoherent I/O with KVM. Signed-off-by: Alex Williamson <alex.williamson@redhat.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to 'virt')
-rw-r--r--virt/kvm/iommu.c16
1 files changed, 8 insertions, 8 deletions
diff --git a/virt/kvm/iommu.c b/virt/kvm/iommu.c
index a3b14109049..d32d156a423 100644
--- a/virt/kvm/iommu.c
+++ b/virt/kvm/iommu.c
@@ -79,7 +79,7 @@ int kvm_iommu_map_pages(struct kvm *kvm, struct kvm_memory_slot *slot)
flags = IOMMU_READ;
if (!(slot->flags & KVM_MEM_READONLY))
flags |= IOMMU_WRITE;
- if (kvm->arch.iommu_flags & KVM_IOMMU_CACHE_COHERENCY)
+ if (!kvm->arch.iommu_noncoherent)
flags |= IOMMU_CACHE;
@@ -158,7 +158,8 @@ int kvm_assign_device(struct kvm *kvm,
{
struct pci_dev *pdev = NULL;
struct iommu_domain *domain = kvm->arch.iommu_domain;
- int r, last_flags;
+ int r;
+ bool noncoherent;
/* check if iommu exists and in use */
if (!domain)
@@ -174,15 +175,13 @@ int kvm_assign_device(struct kvm *kvm,
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;
+ noncoherent = !iommu_domain_has_cap(kvm->arch.iommu_domain,
+ IOMMU_CAP_CACHE_COHERENCY);
/* Check if need to update IOMMU page table for guest memory */
- if ((last_flags ^ kvm->arch.iommu_flags) ==
- KVM_IOMMU_CACHE_COHERENCY) {
+ if (noncoherent != kvm->arch.iommu_noncoherent) {
kvm_iommu_unmap_memslots(kvm);
+ kvm->arch.iommu_noncoherent = noncoherent;
r = kvm_iommu_map_memslots(kvm);
if (r)
goto out_unmap;
@@ -342,6 +341,7 @@ int kvm_iommu_unmap_guest(struct kvm *kvm)
mutex_lock(&kvm->slots_lock);
kvm_iommu_unmap_memslots(kvm);
kvm->arch.iommu_domain = NULL;
+ kvm->arch.iommu_noncoherent = false;
mutex_unlock(&kvm->slots_lock);
iommu_domain_free(domain);