On Tue, Jul 18, 2017 at 10:23:06AM +0300, Dmitry Fleytman wrote:
> On 17 Jul 2017, at 19:59 PM, Michael S. Tsirkin <m...@redhat.com> wrote:
>
>
> On Mon, Jul 17, 2017 at 03:48:03PM +0300, Dmitry Fleytman wrote:
>
> Am I understand correctly that there are no special cases for
> IDE controllers, i.e. bus master bit must be set by SW same
> way as for other PCI devices?
>
>
> Bus mastering is typically enabled by the driver.
> E.g. under linux:
>
> static int virtio_pci_restore(struct device *dev)
> {
> struct pci_dev *pci_dev = to_pci_dev(dev);
> struct virtio_pci_device *vp_dev = pci_get_drvdata(pci_dev);
> int ret;
>
> ret = pci_enable_device(pci_dev);
> if (ret)
> return ret;
>
> pci_set_master(pci_dev);
> return virtio_device_restore(&vp_dev->vdev);
> }
>
>
> As an exception, in case of BIOS booting using device ROM, it is set by
> the ROM. E.g. src/hw/virtio-pci.c:
>
> vp_reset(vp);
> pci_enable_busmaster(pci);
> vp_set_status(vp, VIRTIO_CONFIG_S_ACKNOWLEDGE |
> VIRTIO_CONFIG_S_DRIVER );
>
>
>
> Thanks, Michael.
>
> After some more investigations, there are additional interesting details.
>
> First of all, resume from hibernation succeeds without USB host controller
> (-usbtablet).
>
> I did tracing of PCI configuration space writes and here is what I see:
All I can say is uhci confuses windows somehow.
Try another type of controller?
> --
> MST
>
>
