i am passing through a GPU to a guest and it works, but OVMF and grub do not display anything, the graphics card goes unused until the guest OS starts using it and then the monitor turns on. i can access OVMF by using virsh console form the host, but is there any way to enable OVMF to use a passed-through graphics card? here is my XML file for the VM in question.
the graphics card is host device 48
VM XML
<domain type='kvm' id='2'>
<name>TESSA1</name>
<uuid>50ec8055-258b-47e0-a20f-7730cf37c879</uuid>
<memory unit='KiB'>67108864</memory>
<currentMemory unit='KiB'>67108864</currentMemory>
<vcpu placement='static'>12</vcpu>
<cputune>
<vcpupin vcpu='0' cpuset='8'/>
<vcpupin vcpu='1' cpuset='24'/>
<vcpupin vcpu='2' cpuset='9'/>
<vcpupin vcpu='3' cpuset='25'/>
<vcpupin vcpu='4' cpuset='10'/>
<vcpupin vcpu='5' cpuset='26'/>
<vcpupin vcpu='6' cpuset='11'/>
<vcpupin vcpu='7' cpuset='27'/>
<vcpupin vcpu='8' cpuset='12'/>
<vcpupin vcpu='9' cpuset='28'/>
<vcpupin vcpu='10' cpuset='13'/>
<vcpupin vcpu='11' cpuset='29'/>
</cputune>
<numatune>
<memory mode='strict' placement='auto'/>
</numatune>
<resource>
<partition>/machine</partition>
</resource>
<os>
<type arch='x86_64' machine='pc-q35-5.2'>hvm</type>
<loader readonly='no' type='rom'>/usr/share/ovmf/OVMFTESSA1.fd</loader>
</os>
<features>
<acpi/>
<apic/>
<hyperv>
<relaxed state='on'/>
<vapic state='on'/>
<spinlocks state='on' retries='8191'/>
<vpindex state='on'/>
<synic state='on'/>
<stimer state='on'/>
<reset state='on'/>
</hyperv>
<vmport state='off'/>
<ioapic driver='kvm'/>
</features>
<cpu mode='host-passthrough' check='none' migratable='off'>
<topology sockets='1' dies='1' cores='6' threads='2'/>
<feature policy='require' name='topoext'/>
</cpu>
<clock offset='utc'>
<timer name='rtc' tickpolicy='catchup'/>
<timer name='pit' tickpolicy='delay'/>
<timer name='hpet' present='yes'/>
<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='no'/>
<suspend-to-disk enabled='no'/>
</pm>
<devices>
<emulator>/usr/bin/qemu-system-x86_64</emulator>
<disk type='file' device='disk'>
<driver name='qemu' type='qcow2'/>
<source file='/media/primaryarray/tessa1mass.img' index='2'/>
<backingStore/>
<target dev='vda' bus='virtio'/>
<alias name='virtio-disk0'/>
<address type='pci' domain='0x0000' bus='0x00' slot='0x0b' function='0x0'/>
</disk>
<disk type='file' device='cdrom'>
<driver name='qemu' type='raw'/>
<source file='/root/debian-live-11.1.0-amd64-lxde.iso' index='1'/>
<backingStore/>
<target dev='sda' bus='sata'/>
<readonly/>
<alias name='sata0-0-0'/>
<address type='drive' controller='0' bus='0' target='0' unit='0'/>
</disk>
<controller type='pci' index='0' model='pcie-root'>
<alias name='pcie.0'/>
</controller>
<controller type='pci' index='1' model='pcie-root-port'>
<model name='pcie-root-port'/>
<target chassis='1' port='0xf'/>
<alias name='pci.1'/>
<address type='pci' domain='0x0000' bus='0x00' slot='0x01' function='0x7'/>
</controller>
<controller type='pci' index='2' model='pcie-root-port'>
<model name='pcie-root-port'/>
<target chassis='2' port='0x9'/>
<alias name='pci.2'/>
<address type='pci' domain='0x0000' bus='0x00' slot='0x01' function='0x1'/>
</controller>
<controller type='pci' index='3' model='pcie-root-port'>
<model name='pcie-root-port'/>
<target chassis='3' port='0xa'/>
<alias name='pci.3'/>
<address type='pci' domain='0x0000' bus='0x00' slot='0x01' function='0x2'/>
</controller>
<controller type='pci' index='4' model='pcie-root-port'>
<model name='pcie-root-port'/>
<target chassis='4' port='0xb'/>
<alias name='pci.4'/>
<address type='pci' domain='0x0000' bus='0x00' slot='0x01' function='0x3'/>
</controller>
<controller type='pci' index='5' model='pcie-root-port'>
<model name='pcie-root-port'/>
<target chassis='5' port='0xc'/>
<alias name='pci.5'/>
<address type='pci' domain='0x0000' bus='0x00' slot='0x01' function='0x4'/>
</controller>
<controller type='pci' index='6' model='pcie-root-port'>
<model name='pcie-root-port'/>
<target chassis='6' port='0xd'/>
<alias name='pci.6'/>
<address type='pci' domain='0x0000' bus='0x00' slot='0x01' function='0x5'/>
</controller>
<controller type='pci' index='7' model='pcie-root-port'>
<model name='pcie-root-port'/>
<target chassis='7' port='0xe'/>
<alias name='pci.7'/>
<address type='pci' domain='0x0000' bus='0x00' slot='0x01' function='0x6'/>
</controller>
<controller type='pci' index='8' model='pcie-root-port'>
<model name='pcie-root-port'/>
<target chassis='8' port='0x8'/>
<alias name='pci.8'/>
<address type='pci' domain='0x0000' bus='0x00' slot='0x01' function='0x0' multifunction='on'/>
</controller>
<controller type='pci' index='9' model='pcie-root-port'>
<model name='pcie-root-port'/>
<target chassis='9' port='0x18'/>
<alias name='pci.9'/>
<address type='pci' domain='0x0000' bus='0x00' slot='0x03' function='0x0'/>
</controller>
<controller type='pci' index='10' model='pcie-to-pci-bridge'>
<model name='pcie-pci-bridge'/>
<alias name='pci.10'/>
<address type='pci' domain='0x0000' bus='0x03' slot='0x00' function='0x0'/>
</controller>
<controller type='virtio-serial' index='0'>
<alias name='virtio-serial0'/>
<address type='pci' domain='0x0000' bus='0x00' slot='0x06' function='0x0'/>
</controller>
<controller type='usb' index='0' model='qemu-xhci' ports='15'>
<alias name='usb'/>
<address type='pci' domain='0x0000' bus='0x00' slot='0x05' function='0x0'/>
</controller>
<controller type='sata' index='0'>
<alias name='ide'/>
<address type='pci' domain='0x0000' bus='0x00' slot='0x1f' function='0x2'/>
</controller>
<serial type='pty'>
<source path='/dev/pts/1'/>
<target type='isa-serial' port='0'>
<model name='isa-serial'/>
</target>
<alias name='serial0'/>
</serial>
<console type='pty' tty='/dev/pts/1'>
<source path='/dev/pts/1'/>
<target type='serial' port='0'/>
<alias name='serial0'/>
</console>
<input type='mouse' bus='ps2'>
<alias name='input0'/>
</input>
<input type='keyboard' bus='ps2'>
<alias name='input1'/>
</input>
<hostdev mode='subsystem' type='pci' managed='yes'>
<driver name='vfio'/>
<source>
<address domain='0x0000' bus='0x0a' slot='0x10' function='0x2'/>
</source>
<alias name='hostdev0'/>
<address type='pci' domain='0x0000' bus='0x00' slot='0x08' function='0x0'/>
</hostdev>
<hostdev mode='subsystem' type='pci' managed='yes'>
<driver name='vfio'/>
<source>
<address domain='0x0000' bus='0x09' slot='0x00' function='0x0'/>
</source>
<boot order='1'/>
<alias name='hostdev1'/>
<address type='pci' domain='0x0000' bus='0x02' slot='0x00' function='0x0'/>
</hostdev>
<hostdev mode='subsystem' type='pci' managed='yes'>
<driver name='vfio'/>
<source>
<address domain='0x0000' bus='0x48' slot='0x00' function='0x0'/>
</source>
<alias name='hostdev2'/>
<address type='pci' domain='0x0000' bus='0x00' slot='0x02' function='0x0' multifunction='on'/>
</hostdev>
<hostdev mode='subsystem' type='pci' managed='yes'>
<driver name='vfio'/>
<source>
<address domain='0x0000' bus='0x48' slot='0x00' function='0x1'/>
</source>
<alias name='hostdev3'/>
<address type='pci' domain='0x0000' bus='0x00' slot='0x02' function='0x1'/>
</hostdev>
<hostdev mode='subsystem' type='pci' managed='yes'>
<driver name='vfio'/>
<source>
<address domain='0x0000' bus='0x49' slot='0x00' function='0x3'/>
</source>
<alias name='hostdev4'/>
<address type='pci' domain='0x0000' bus='0x01' slot='0x00' function='0x0'/>
</hostdev>
<memballoon model='none'/>
<shmem name='looking-glass'>
<model type='ivshmem-plain'/>
<size unit='M'>32</size>
<alias name='shmem0'/>
<address type='pci' domain='0x0000' bus='0x00' slot='0x04' function='0x0'/>
</shmem>
</devices>
<seclabel type='dynamic' model='dac' relabel='yes'>
<label>+0:+64055</label>
<imagelabel>+0:+64055</imagelabel>
</seclabel>
</domain>
the card itself works fine and i can game on this guest, i just am very annoyed at the monitors not showing anything until the guests kernel loads amdgpu.