https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=236922
Bug ID: 236922
Summary: Virtio fails as QEMU-KVM guest with Q35 chipset on
Ubuntu 18.04.2 LTS
Product: Base System
Version: 12.0-RELEASE
Hardware: amd64
OS: Any
Status: New
Severity: Affects Many People
Priority: ---
Component: kern
Assignee: [email protected]
Reporter: [email protected]
Created attachment 203279
--> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=203279&action=edit
various data collection for bug report
Environment:
Host OS: Ubuntu 18.04.2 LTS (updated)
Libvirt: (libvirt-bin) 4.0.0-1ubuntu8.8
QEMU: 1:2.11+dfsg-1ubuntu7.12
QEMU-KVM: 1:2.11+dfsg-1ubuntu7.12
Guest OS: FreeBSD 12.0-RELEASE
If the VM configuration uses i440FX chipset, everything works as expected.
When configured to use Q35 chipset, virtio failed to load properly and any
device configured to use virtio would not be detected.
Attachments within zip of data gathered from the same VM:
QEMU-KVM_freebsd_virtio_1.png - screen shot of the VM configuration as seen
in virt-manager
z_fbsd_q35.xml - Libvirt/QEMU XML configuration for the same
VM seen in the screen shot
pciconf_12.0_r341666_ori.txt - output of 'pciconf -lvce' of the original
kernel r341666 used during install
pciconf_12.0_r345757_custom.txt - output of 'pciconf -lvce' of the kernel
r345757 built from updated src
sysctl.hw_r345757_custom.txt - output of 'sysctl hw' of the kernel r345757
built from updated src
Custom12 - kernel configuration (copy of GENERIC with
unneeded drivers and configs removed)
make.conf - make.conf used in building kernel r345757
src.conf - src.conf used in building kernel r345757.
Buildworld was not done. Only buildkernel and installkernel.
In the screen shot QEMU-KVM_freebsd_virtio_1.png, the "Controller SCSI 1" is
added as SCSI controller having "Hypervisor default" model. FreeBSD detected
and loaded the 'sym' SCSI driver. While the "Controller Virtio SCSI 0" is added
as SCSI controller having "VirtIO SCSI" model. The custom kernel show the
VirtIO PCI controller in pciconf but any virtio HDD attached does not show up
in /dev.
How to repeat:
1) Install Ubuntu 18.04.2 desktop to support virtualization using libvirt,
QEMU-KVM, and virt-manager.
2) Use virt-manager to create/import a VM
2a) Select x86_64 architecture
2b) Make sure to check "Customize configuration before install"
3a) In the popup customization window, change the chipset from i440FX to Q35 in
the overview.
3b) Select the HDD and change the "Disk bus" in "Advanced options" to VirtIO
3c) Select the NIC and change the "Device model" to virtio
4) Boot from imported HDD or from ISO media to install
Utilizing the Q35 chipset, FreeBSD would neither boot properly nor install when
both HDD and NIC are virtio. If the HDD is SATA type and NIC is other virtio,
everything works.
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