I have recently changed a Windows VM from passthrough of an AMD gpu to nVidia gpu. The VM runs win 8,1, the host is Ubuntu 16.04 (Xenial) with vanilla packages ie. libvirt 1.3.1, qemu 2.5

This has meant I needed to hide kvm and set the vendor_id. The vm now runs successfully with an nVidia card and nVidia drivers

I have 2 questions

1) How can I verify that windows still recognises the hyper-v facilities (hv_time,hv_relaxed,hv_vapic,hv_spinlocks=0x1fff) and is operating accordingly ?

2) I read that Haswell and newer include an apic facility which works faster without hv_vapic .... is this "rumour" accurate ? (I have a Haswell motherboard) REF: https://www.reddit.com/r/VFIO/comments/479xnx/guests_with_nvidia_gpus_can_enable_hyperv/ If true should I disable hv_vapic ? Is it safe to assume that x2apic will remain enabled ?

thanks

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