[vfio-users] about hotplug of the IGD device

[fulaiyang]

Hi Manuel:
Now what I want to do is that rebinding the GPU to the i915 drivers after having started the vm. 
Do you have any ways or advices? Thanks.








At 2017-03-13 22:21:33, "Manuel Ullmann" <ullman.alias at posteo.de> wrote:
>> But I find a interesting thing, if I don't
>> start the vm after GPU is bind to the vfio, GPU can still be rebind to
>> the i915 driver. Do you know why? Thanks. 
>
>As Alex’ blog [1] pointed out, vfio-pci is basically pci-stub plus
>creating a vfio device node. pci-stub just prevents other drivers from
>binding to the device. The vfio device node on the other hand makes the
>device address space available for Guest OSes, but it does not touch the
>device itself. So its address space (think of it as GPU ram + internal
>buffer and registers) is still left in a pristine state until you bind
>it to a VM. For that reason it makes perfectly sense, that you can
>rebind it to i915, if you did not start any VM with VGA passthrough.
>
>Kind regards,
>Manuel
>
>[1]: https://vfio.blogspot.de/2015/05/vfio-gpu-how-to-series-part-3-host.html
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