diff options
Diffstat (limited to 'results/classifier/accel-gemma3:12b/kvm/1882784')
| -rw-r--r-- | results/classifier/accel-gemma3:12b/kvm/1882784 | 32 |
1 files changed, 32 insertions, 0 deletions
diff --git a/results/classifier/accel-gemma3:12b/kvm/1882784 b/results/classifier/accel-gemma3:12b/kvm/1882784 new file mode 100644 index 000000000..544e24276 --- /dev/null +++ b/results/classifier/accel-gemma3:12b/kvm/1882784 @@ -0,0 +1,32 @@ + +Legacy IGD passthrough in QEMU 5 disabled + +Bug with tag v5.0.0, or commit fdd76fecdde1ad444ff4deb7f1c4f7e4a1ef97d6 + +As of QEMU 5 Legacy IGD PT is no longer working. + +Host is a Xeon E3-1226 v3 and my method to test is to run the following: + +./qemu-system-x86_64 \ + -device 'pci-bridge,id=pci.1,chassis_nr=1,bus=pci.0,addr=0x1f' \ + -device 'vfio-pci,host=00:02.0,addr=02.0' \ + -L '/usr/share/kvm' \ + -nographic \ + -vga none \ + -nodefaults + +in the hope of seeing a "IGD device 0000:00:02.0 cannot support legacy mode due to existing devices at address 1f.0" error. + +The culprit appears to be this commit: + +https://github.com/qemu/qemu/commit/29d62771c81d8fd244a67c14a1d968c268d3fb19 + +Specifically the following block in pci-quirks.c: + +#ifdef CONFIG_VFIO_IGD + vfio_probe_igd_bar4_quirk(vdev, nr); +#endif + +as the kconfig variable CONFIG_VFIO_IGD doesn't appear to be available outside of makefiles as described here: https://qemu.weilnetz.de/doc/devel/kconfig.html. I can confirm that the igd code is being pulled in as removing this check, as would defining the variable I presume, makes Legacy IGD PT work again (ie I see the expected "existing devices" error). + +I first spotted this in Proxmox, but have confirmed the bug by building QEMU sources. \ No newline at end of file |