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authorPaolo Bonzini <pbonzini@redhat.com>2015-07-07 15:41:58 +0200
committerPaolo Bonzini <pbonzini@redhat.com>2015-07-10 13:25:26 +0200
commit5544eb9b81940647b8fad1f251b37cbe2819ce44 (patch)
tree8a3e45817c9ba54102d4ad856cced515bc3bde62 /virt/kvm/vfio.c
parent370777daab3f024f1645177039955088e2e9ae73 (diff)
downloadlinux-stericsson-5544eb9b81940647b8fad1f251b37cbe2819ce44.tar.gz
KVM: count number of assigned devices
If there are no assigned devices, the guest PAT are not providing any useful information and can be overridden to writeback; VMX always does this because it has the "IPAT" bit in its extended page table entries, but SVM does not have anything similar. Hook into VFIO and legacy device assignment so that they provide this information to KVM. Reviewed-by: Alex Williamson <alex.williamson@redhat.com> Tested-by: Joerg Roedel <jroedel@suse.de> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to 'virt/kvm/vfio.c')
-rw-r--r--virt/kvm/vfio.c5
1 files changed, 5 insertions, 0 deletions
diff --git a/virt/kvm/vfio.c b/virt/kvm/vfio.c
index 620e37f741b8..1dd087da6f31 100644
--- a/virt/kvm/vfio.c
+++ b/virt/kvm/vfio.c
@@ -155,6 +155,8 @@ static int kvm_vfio_set_group(struct kvm_device *dev, long attr, u64 arg)
list_add_tail(&kvg->node, &kv->group_list);
kvg->vfio_group = vfio_group;
+ kvm_arch_start_assignment(dev->kvm);
+
mutex_unlock(&kv->lock);
kvm_vfio_update_coherency(dev);
@@ -190,6 +192,8 @@ static int kvm_vfio_set_group(struct kvm_device *dev, long attr, u64 arg)
break;
}
+ kvm_arch_end_assignment(dev->kvm);
+
mutex_unlock(&kv->lock);
kvm_vfio_group_put_external_user(vfio_group);
@@ -239,6 +243,7 @@ static void kvm_vfio_destroy(struct kvm_device *dev)
kvm_vfio_group_put_external_user(kvg->vfio_group);
list_del(&kvg->node);
kfree(kvg);
+ kvm_arch_end_assignment(dev->kvm);
}
kvm_vfio_update_coherency(dev);