[vfio-users] Emulated VGA and real card running in parallel

[Alex Williamson]

On Wed, Sep 16, 2015 at 3:31 PM, Nick Sukharev <nicksukharev at gmail.com>
wrote:

>
> I managed to configure i7-5820K / Asrock x99 Extreme 4 / 3 different
> radeons (R9 270, R9 270x and R7 240) for passthrough and I am pretty sure I
> can even put a 4th card there if I need to. It only works properly with
> UEFI bios in QEMU and I used stock Ubuntu 15.05 for everything except the
> UEFI bios that I recompiled from source.
>
> I have several VMs, one for each card and I start them with emulated
> graphics also enabled. This allows me to use the emulated keyboard/mouse
> without any need to pass USB devices as well. The way it works now:
> 1) I start a vm via CLI. It displays "Starting WIndows" in the emulated
> window
> 2) In a few seconds it switches to the second display connected to the
> passthrough card.
> I can still use the emulated window to grab/release mouse and keyboard
> focus and it works pretty well for what I am using it for.
>
> For my host graphics I am using DisplayLink USB adapter to make all PCIE
> cards available for passthrough.
>
> Here is the question I have: the emulated graphcs card gets disabled as
> soon as the real card driver kicks in. Is it somehow possible to leave it
> functional so that I can have a second virtual monitor in the window for my
> VM?
>

It's not QEMU disabling the emulated graphics, it's the guest, so it
depends on what guest you're running.  Windows 8 (and I assume 10) can
support this, not so much with Win7.
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