[libvirt] [PATCH 0/3] sample: vfio mdev display devices.

[Paolo Bonzini]

On 19/04/2018 10:40, Gerd Hoffmann wrote:
>> So I was ready to return and suggest that maybe libvirt should probe
>> the device to know about these ancillary configuration details, but
>> then I remembered that both mdev vGPU vendors had external dependencies
>> to even allow probing the device.  KVMGT will fail to open the device
>> if it's not associated with an instance of KVM and NVIDIA vGPU, I
>> believe, will fail if the vGPU manager process cannot find the QEMU
>> instance to extract the VM UUID.  (Both of these were bad ideas)
> Oops.  I've trapped into the kvm issue too.  Wondering what the reason
> is, shouldn't this work with tcg too?

As far as I understand, KVMGT requires KVM support in order to track
writes to guest memory.  It's a kernel API provided by the kvm.ko
module, so no TCG support.

Paolo