As you pointed it out that I want to unbind and rebind the GPU with the i915
driver repeatedly. 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.
在 2017-03-10 22:22:53，"Alex Williamson" <alex.l.william...@gmail.com> 写道：
On Fri, Mar 10, 2017 at 2:47 AM, fulaiyang <fulaiy...@163.com> wrote:
Hi Alex:
After passthrough the IGD device to the virtual machine, the linux host can
not use the IGD device again. And the dmesg tell that i915 can not restart the
GPU. I know 'Hotplug of the IGD device is not supported' from the 'VFIO tips
and tricks'. Could you tell me why? and is there some ways to work it out?
Nothing in vfio specifically prevents hotplug of any GPU, including IGD. The
trouble with hotplug of GPUs is that it's generally poorly supported by the
device drivers, both host and guest. The driver and software stack for hotplug
of a graphics device is simply not as robust as something like a NIC device.
For instance, I think if you were to unbind and rebind IGD with the i915 driver
repeatedly, you'd hit similar errors to the case where IGD is used by vfio and
returned to the host i915 driver. Thanks,
Alex _______________________________________________
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