path: root/virt
diff options
authorSheng Yang <>2008-10-31 12:37:41 +0800
committerAvi Kivity <>2008-12-31 16:51:49 +0200
commit6eb55818c043b097c83828da8430fcb9a02fdb89 (patch)
tree8bdd77fa9fb110e50905093c746c3f70e62cb2ba /virt
parent853dafb62b386a3a75808483a120998e734eb6e1 (diff)
KVM: Enable Function Level Reset for assigned device
Ideally, every assigned device should in a clear condition before and after assignment, so that the former state of device won't affect later work. Some devices provide a mechanism named Function Level Reset, which is defined in PCI/PCI-e document. We should execute it before and after device assignment. (But sadly, the feature is new, and most device on the market now don't support it. We are considering using D0/D3hot transmit to emulate it later, but not that elegant and reliable as FLR itself.) [Update: Reminded by Xiantao, execute FLR after we ensure that the device can be assigned to the guest.] Signed-off-by: Sheng Yang <> Signed-off-by: Avi Kivity <>
Diffstat (limited to 'virt')
1 files changed, 5 insertions, 0 deletions
diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
index 4f43abe198e4..1838052f3c9e 100644
--- a/virt/kvm/kvm_main.c
+++ b/virt/kvm/kvm_main.c
@@ -152,6 +152,8 @@ static void kvm_free_assigned_device(struct kvm *kvm,
+ pci_reset_function(assigned_dev->dev);
@@ -283,6 +285,9 @@ static int kvm_vm_ioctl_assign_device(struct kvm *kvm,
goto out_disable;
+ pci_reset_function(dev);
match->assigned_dev_id = assigned_dev->assigned_dev_id;
match->host_busnr = assigned_dev->busnr;
match->host_devfn = assigned_dev->devfn;