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| author | Alex Williamson <alex.williamson@redhat.com> | 2013-10-30 11:02:23 -0600 |
|---|---|---|
| committer | Paolo Bonzini <pbonzini@redhat.com> | 2013-10-30 19:02:13 +0100 |
| commit | d96eb2c6f480769bff32054e78b964860dae4d56 (patch) | |
| tree | 48245bcee8cd688c11c2974c4a0c7391660dd423 /virt/kvm/iommu.c | |
| parent | ec53500fae421e07c5d035918ca454a429732ef4 (diff) | |
| download | lwn-d96eb2c6f480769bff32054e78b964860dae4d56.tar.gz lwn-d96eb2c6f480769bff32054e78b964860dae4d56.zip | |
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/kvm/iommu.c')
| -rw-r--r-- | virt/kvm/iommu.c | 16 |
1 files changed, 8 insertions, 8 deletions
diff --git a/virt/kvm/iommu.c b/virt/kvm/iommu.c index a3b14109049b..d32d156a423a 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); |