Yes, but windows *knows* the passed device is then shutdown. At reboot windows *knows* that the device is "freshly" rebooted.
In your case, another OS (linux) use this card at a moment or another, reset some bus (when re-binded to vfio). The reset of cards is already hardly supported by windows / linux driver. For my case: i know that my r9 290 can hard freeze if i shudown badly my windows vm: the os is completely unloaded "software speaking" but the card not, and it is still "powered". 2 options, when i restart the driver crash windows, or the driver crash windows + the card + the host. No problem when making a correct windows shut-down / start => the card is cleanly unloaded by windows and cleanly restarted. -- Deldycke Quentin On 18 April 2017 at 13:53, Patrick O'Callaghan <p...@usb.ve> wrote: > On Tue, 2017-04-18 at 13:32 +0200, Quentin Deldycke wrote: > > You can't do like this. Even sleep is not correctly supported. > > > > What is happening to the card during reboot? How windows can know? > > Windows supports hibernation on some machines (e.g. laptops and > tablets). That presumably does save the state of all devices. However > KVM/QEMU doesn't seem to include the appropriate virtual hardware > emulation. > > poc >
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