I finally set myself up with a dual GPU setup and am wanting to use looking glass for any future gaming, but am running into some issues. First, I had some issues setting a custom refresh rate on a dummy display, which AFAICT is a common problem with AMD GPUs. Then, I discovered the AMD’s vDisplay that spins up when no display is plugged into the guest card. I was able to create a custom refresh rate for the vDisplay and so far, it looks like everything works well with one exception: I can’t run games in fullscreen. I get the following error when switching to fullscreen:
vfio-pci 0000:0b:00.0: vfio_bar_restore: reset recovery - restoring BARs
Does anyone know what the problem might be? Does anyone actually use the vDisplay? I haven’t seen or heard anything about it until I accidently stumbled on it while messing around with looking glass.
Specs:
Motherboard: X570 Aorus Pro
CPU: Ryzen 7 3700x
Host GPU: RX 6600XT
Guest GPU: RX 6800XT
XML:
<domain type="kvm">
<name>Windows10</name>
<uuid>dcfea6ec-c1ea-4081-931b-2001d36a26f3</uuid>
<metadata>
<libosinfo:libosinfo xmlns:libosinfo="http://libosinfo.org/xmlns/libvirt/domain/1.0">
<libosinfo:os id="http://microsoft.com/win/10"/>
</libosinfo:libosinfo>
</metadata>
<memory unit="KiB">16777216</memory>
<currentMemory unit="KiB">16777216</currentMemory>
<memoryBacking>
<hugepages/>
</memoryBacking>
<vcpu placement="static">12</vcpu>
<iothreads>1</iothreads>
<cputune>
<vcpupin vcpu="0" cpuset="0"/>
<vcpupin vcpu="1" cpuset="1"/>
<vcpupin vcpu="2" cpuset="2"/>
<vcpupin vcpu="3" cpuset="3"/>
<vcpupin vcpu="4" cpuset="4"/>
<vcpupin vcpu="5" cpuset="5"/>
<vcpupin vcpu="6" cpuset="6"/>
<vcpupin vcpu="7" cpuset="7"/>
<vcpupin vcpu="8" cpuset="8"/>
<vcpupin vcpu="9" cpuset="9"/>
<vcpupin vcpu="10" cpuset="10"/>
<vcpupin vcpu="11" cpuset="11"/>
<emulatorpin cpuset="12-13"/>
<iothreadpin iothread="1" cpuset="14-15"/>
</cputune>
<os>
<type arch="x86_64" machine="pc-q35-6.2">hvm</type>
<loader readonly="yes" type="pflash">/usr/share/edk2-ovmf/x64/OVMF_CODE.fd</loader>
<nvram>/var/lib/libvirt/qemu/nvram/Windows10_VARS.fd</nvram>
<boot dev="hd"/>
</os>
<features>
<acpi/>
<apic/>
<hyperv mode="custom">
<relaxed state="on"/>
<vapic state="on"/>
<spinlocks state="on" retries="8191"/>
</hyperv>
<vmport state="off"/>
</features>
<cpu mode="host-passthrough" check="none" migratable="on">
<topology sockets="1" dies="1" cores="6" threads="2"/>
</cpu>
<clock offset="localtime">
<timer name="rtc" tickpolicy="catchup"/>
<timer name="pit" tickpolicy="delay"/>
<timer name="hpet" present="no"/>
<timer name="hypervclock" present="yes"/>
</clock>
<on_poweroff>destroy</on_poweroff>
<on_reboot>restart</on_reboot>
<on_crash>destroy</on_crash>
<pm>
<suspend-to-mem enabled="yes"/>
<suspend-to-disk enabled="yes"/>
</pm>
<devices>
<emulator>/usr/bin/qemu-system-x86_64</emulator>
<disk type="block" device="disk">
<driver name="qemu" type="raw" cache="unsafe" discard="unmap" detect_zeroes="unmap"/>
<source dev="/dev/zvol/fast/vms/Windows10-default"/>
<target dev="vda" bus="virtio"/>
<address type="pci" domain="0x0000" bus="0x04" slot="0x00" function="0x0"/>
</disk>
<disk type="block" device="disk">
<driver name="qemu" type="raw" cache="unsafe" discard="unmap" detect_zeroes="unmap"/>
<source dev="/dev/zvol/fast/vms/Games"/>
<target dev="vdb" bus="virtio"/>
<address type="pci" domain="0x0000" bus="0x11" slot="0x00" function="0x0"/>
</disk>
<controller type="usb" index="0" model="qemu-xhci" ports="15">
<address type="pci" domain="0x0000" bus="0x02" slot="0x00" function="0x0"/>
</controller>
<controller type="sata" index="0">
<address type="pci" domain="0x0000" bus="0x00" slot="0x1f" function="0x2"/>
</controller>
<controller type="pci" index="0" model="pcie-root"/>
<controller type="pci" index="1" model="pcie-root-port">
<model name="pcie-root-port"/>
<target chassis="1" port="0x10"/>
<address type="pci" domain="0x0000" bus="0x00" slot="0x02" function="0x0" multifunction="on"/>
</controller>
<controller type="pci" index="2" model="pcie-root-port">
<model name="pcie-root-port"/>
<target chassis="2" port="0x11"/>
<address type="pci" domain="0x0000" bus="0x00" slot="0x02" function="0x1"/>
</controller>
<controller type="pci" index="3" model="pcie-root-port">
<model name="pcie-root-port"/>
<target chassis="3" port="0x12"/>
<address type="pci" domain="0x0000" bus="0x00" slot="0x02" function="0x2"/>
</controller>
<controller type="pci" index="4" model="pcie-root-port">
<model name="pcie-root-port"/>
<target chassis="4" port="0x13"/>
<address type="pci" domain="0x0000" bus="0x00" slot="0x02" function="0x3"/>
</controller>
<controller type="pci" index="5" model="pcie-root-port">
<model name="pcie-root-port"/>
<target chassis="5" port="0x14"/>
<address type="pci" domain="0x0000" bus="0x00" slot="0x02" function="0x4"/>
</controller>
<controller type="pci" index="6" model="pcie-root-port">
<model name="pcie-root-port"/>
<target chassis="6" port="0x15"/>
<address type="pci" domain="0x0000" bus="0x00" slot="0x02" function="0x5"/>
</controller>
<controller type="pci" index="7" model="pcie-root-port">
<model name="pcie-root-port"/>
<target chassis="7" port="0x16"/>
<address type="pci" domain="0x0000" bus="0x00" slot="0x02" function="0x6"/>
</controller>
<controller type="pci" index="8" model="pcie-root-port">
<model name="pcie-root-port"/>
<target chassis="8" port="0x17"/>
<address type="pci" domain="0x0000" bus="0x00" slot="0x02" function="0x7"/>
</controller>
<controller type="pci" index="9" model="pcie-root-port">
<model name="pcie-root-port"/>
<target chassis="9" port="0x18"/>
<address type="pci" domain="0x0000" bus="0x00" slot="0x03" function="0x0" multifunction="on"/>
</controller>
<controller type="pci" index="10" model="pcie-root-port">
<model name="pcie-root-port"/>
<target chassis="10" port="0x19"/>
<address type="pci" domain="0x0000" bus="0x00" slot="0x03" function="0x1"/>
</controller>
<controller type="pci" index="11" model="pcie-root-port">
<model name="pcie-root-port"/>
<target chassis="11" port="0x1a"/>
<address type="pci" domain="0x0000" bus="0x00" slot="0x03" function="0x2"/>
</controller>
<controller type="pci" index="12" model="pcie-root-port">
<model name="pcie-root-port"/>
<target chassis="12" port="0x1b"/>
<address type="pci" domain="0x0000" bus="0x00" slot="0x03" function="0x3"/>
</controller>
<controller type="pci" index="13" model="pcie-root-port">
<model name="pcie-root-port"/>
<target chassis="13" port="0x1c"/>
<address type="pci" domain="0x0000" bus="0x00" slot="0x03" function="0x4"/>
</controller>
<controller type="pci" index="14" model="pcie-to-pci-bridge">
<model name="pcie-pci-bridge"/>
<address type="pci" domain="0x0000" bus="0x05" slot="0x00" function="0x0"/>
</controller>
<controller type="pci" index="15" model="pcie-root-port">
<model name="pcie-root-port"/>
<target chassis="15" port="0x1d"/>
<address type="pci" domain="0x0000" bus="0x00" slot="0x03" function="0x5"/>
</controller>
<controller type="pci" index="16" model="pcie-root-port">
<model name="pcie-root-port"/>
<target chassis="16" port="0x1e"/>
<address type="pci" domain="0x0000" bus="0x00" slot="0x03" function="0x6"/>
</controller>
<controller type="pci" index="17" model="pcie-root-port">
<model name="pcie-root-port"/>
<target chassis="17" port="0x8"/>
<address type="pci" domain="0x0000" bus="0x00" slot="0x01" function="0x0"/>
</controller>
<controller type="virtio-serial" index="0">
<address type="pci" domain="0x0000" bus="0x03" slot="0x00" function="0x0"/>
</controller>
<interface type="bridge">
<mac address="52:54:00:61:bb:6a"/>
<source bridge="virbr0"/>
<model type="virtio"/>
<address type="pci" domain="0x0000" bus="0x01" slot="0x00" function="0x0"/>
</interface>
<serial type="pty">
<target type="isa-serial" port="0">
<model name="isa-serial"/>
</target>
</serial>
<console type="pty">
<target type="serial" port="0"/>
</console>
<channel type="spicevmc">
<target type="virtio" name="com.redhat.spice.0"/>
<address type="virtio-serial" controller="0" bus="0" port="1"/>
</channel>
<input type="keyboard" bus="virtio">
<address type="pci" domain="0x0000" bus="0x0d" slot="0x00" function="0x0"/>
</input>
<input type="mouse" bus="virtio">
<address type="pci" domain="0x0000" bus="0x10" slot="0x00" function="0x0"/>
</input>
<input type="mouse" bus="ps2"/>
<input type="keyboard" bus="ps2"/>
<tpm model="tpm-crb">
<backend type="emulator" version="2.0"/>
</tpm>
<graphics type="spice" autoport="yes">
<listen type="address"/>
<image compression="off"/>
<gl enable="no"/>
</graphics>
<sound model="ich9">
<codec type="micro"/>
<audio id="1"/>
<address type="pci" domain="0x0000" bus="0x00" slot="0x1b" function="0x0"/>
</sound>
<audio id="1" type="spice"/>
<video>
<model type="none"/>
</video>
<hostdev mode="subsystem" type="pci" managed="yes">
<source>
<address domain="0x0000" bus="0x06" slot="0x00" function="0x0"/>
</source>
<rom bar="off"/>
<address type="pci" domain="0x0000" bus="0x07" slot="0x00" function="0x0"/>
</hostdev>
<hostdev mode="subsystem" type="pci" managed="yes">
<source>
<address domain="0x0000" bus="0x06" slot="0x00" function="0x1"/>
</source>
<rom bar="off"/>
<address type="pci" domain="0x0000" bus="0x08" slot="0x00" function="0x0"/>
</hostdev>
<hostdev mode="subsystem" type="pci" managed="yes">
<source>
<address domain="0x0000" bus="0x06" slot="0x00" function="0x3"/>
</source>
<rom bar="off"/>
<address type="pci" domain="0x0000" bus="0x09" slot="0x00" function="0x0"/>
</hostdev>
<hostdev mode="subsystem" type="pci" managed="yes">
<source>
<address domain="0x0000" bus="0x0b" slot="0x00" function="0x0"/>
</source>
<rom bar="off"/>
<address type="pci" domain="0x0000" bus="0x0a" slot="0x00" function="0x0"/>
</hostdev>
<hostdev mode="subsystem" type="pci" managed="yes">
<source>
<address domain="0x0000" bus="0x0b" slot="0x00" function="0x1"/>
</source>
<rom bar="off"/>
<address type="pci" domain="0x0000" bus="0x0b" slot="0x00" function="0x0"/>
</hostdev>
<hostdev mode="subsystem" type="pci" managed="yes">
<source>
<address domain="0x0000" bus="0x10" slot="0x00" function="0x4"/>
</source>
<rom bar="off"/>
<address type="pci" domain="0x0000" bus="0x0c" slot="0x00" function="0x0"/>
</hostdev>
<redirdev bus="usb" type="spicevmc">
<address type="usb" bus="0" port="2"/>
</redirdev>
<redirdev bus="usb" type="spicevmc">
<address type="usb" bus="0" port="3"/>
</redirdev>
<memballoon model="none"/>
<rng model="virtio">
<backend model="random">/dev/urandom</backend>
<address type="pci" domain="0x0000" bus="0x06" slot="0x00" function="0x0"/>
</rng>
<shmem name="looking-glass">
<model type="ivshmem-plain"/>
<size unit="M">32</size>
<address type="pci" domain="0x0000" bus="0x0e" slot="0x01" function="0x0"/>
</shmem>
</devices>
</domain>