[vfio-users] How To Verify Windows Uses Enlightenments ? Haswell And hv_vapic Parameter ?

[rob e]

On 14/09/16 12:07, Muted Bytes wrote:
> On Thu, Sep 8, 2016 at 5:32 AM, rob e <redgerhoo at yahoo.com.au> wrote:
>> 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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> Regarding 2), what CPU and motherboard specifically do you have? I
> know many Haswell processors do not actually have APICv support (my i7
> definitely does not), and officially only certain Xeon processors (and
> possibly high end i7) are mentioned by Intel to support it.
>

hi MB,
thx for responding.

I have -
cpu - Haswell i5 4670
Motherboard - Asrock Z87-Extreme6