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[Qemu-devel] qemu 2.7.0 incompatible with host kernel < 3.19

From: Brian Rak
Subject: [Qemu-devel] qemu 2.7.0 incompatible with host kernel < 3.19
Date: Tue, 13 Sep 2016 15:10:00 -0400
User-agent: Mozilla/5.0 (Windows NT 6.3; WOW64; rv:45.0) Gecko/20100101 Thunderbird/45.2.0

I have some KVM hosts that I just upgraded to qemu 2.7.0. When the host is running a kernel newer then 3.19, everything works fine.

If the host is running on something lower then 3.19, some guests fail to start. I noticed this on a Ubuntu 16.04 guest, it fails to find the virtio NIC, and this is printed to dmesg:

virtio_net virtio0: virtio: device uses modern interface but does not have VIRTIO_F_VERSION_1

Looking around, I found https://lists.gnu.org/archive/html/qemu-devel/2015-12/msg00373.html , but this does not appear to fully resolve the issue. Any suggestions here? I'm currently just rolling back the upgrade until we can get the kernel upgraded on the rest of the hosts.

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