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| author | Paolo Bonzini <pbonzini@redhat.com> | 2015-07-07 15:41:58 +0200 |
|---|---|---|
| committer | Paolo Bonzini <pbonzini@redhat.com> | 2015-07-10 13:25:26 +0200 |
| commit | 5544eb9b81940647b8fad1f251b37cbe2819ce44 (patch) | |
| tree | 8a3e45817c9ba54102d4ad856cced515bc3bde62 /virt/kvm/vfio.c | |
| parent | 370777daab3f024f1645177039955088e2e9ae73 (diff) | |
| download | linux-5544eb9b81940647b8fad1f251b37cbe2819ce44.tar.gz linux-5544eb9b81940647b8fad1f251b37cbe2819ce44.tar.bz2 linux-5544eb9b81940647b8fad1f251b37cbe2819ce44.zip | |
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.c | 5 |
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); |