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 <sheng@linux.intel.com>
Signed-off-by: Avi Kivity <avi@redhat.com>

diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index 38f79b6..9a4a39c 100644 (file)
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -4148,8 +4148,8 @@ static void kvm_free_vcpus(struct kvm *kvm)
 
 void kvm_arch_destroy_vm(struct kvm *kvm)
 {
-       kvm_iommu_unmap_guest(kvm);
        kvm_free_all_assigned_devices(kvm);
+       kvm_iommu_unmap_guest(kvm);
        kvm_free_pit(kvm);
        kfree(kvm->arch.vpic);
        kfree(kvm->arch.vioapic);

diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
index 4f43abe..1838052 100644 (file)
--- 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,
                 */
                kvm_put_kvm(kvm);
 
+       pci_reset_function(assigned_dev->dev);
+
        pci_release_regions(assigned_dev->dev);
        pci_disable_device(assigned_dev->dev);
        pci_dev_put(assigned_dev->dev);
@@ -283,6 +285,9 @@ static int kvm_vm_ioctl_assign_device(struct kvm *kvm,
                       __func__);
                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;