Conquer gfx_passthru Invalid Option Errors A Comprehensive Guide

No more qemu-system-x86_64: vfio-pci: Cannot read device rom at 0000:07:00.0 Device option ROM contents are probably invalid (check dmesg). Skip ... All crash times are accompanied with error in debug log: [0611/112758.580:ERROR ... You might try the Command Line Argument, -usecoherent. Good ... I'm currently in the process of setting up a win10pro VM. I managed to install windows and It works fine when I use either Unraids VNC or I RDP into it. Hi, How come gfx_passthru is now an invalid option? Does it mean Xen-unstable 4.4 changeset 27214 no longer supports vga passthrough? -- Yours sincerely, ... ... gfx_passthru option enabled, which sets the igd-passthru=on option to Qemu ... + +static void xen_igd_clear_slot(DeviceState *qdev, Error **errp) +{ + ... There is a lot of trial and error involved in setting this up. I tried many things before getting it to work. 1) Everything has CPU-based PCIe ... If you use "gfx_passthru=0", or don't have the gfx_passthru= option at all, then the Xen Qemu-dm emulated Cirrus graphics card will be the ... ... gfx_passthru=1 to the configuration file, it always fails at boot. The first error message that appears when I add gfx_passthru=1 is: libxl: ... (Error about invalid argument) Wont go through every step I took, but I tried radeon.blacklist=1 in different parts of the line, xen-pciback. If I reboot/stop-start the VM, then the GPUs stopped working with error code 43. ... On the VM I am still using the advanced config options pciPassthru0 ...