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Description of problem:
virtio-1.0 has finalized spec, and drivers are already included in RHEL kernel.
while booting still no possible due to firmware dont recognize them yet.
Version-Release number of selected component (if applicable):
OVMF-20150414-2.gitc9e5618.el7.noarch
qemu-kvm-rhev-2.3.0-18.el7.x86_64
How reproducible:
1/1
Steps to Reproduce:
1. boot a vm with virtio-1.0 modern mode only
-netdev tap,id=hostnet0,vhost=on \
-device virtio-net-pci,netdev=hostnet0,id=net0,mac=52:54:00:17:89:55,bus=pci.2,addr=0x1,disable-legacy=on,disable-modern=off
2.
3.
Actual results:
dev: virtio-net-pci, id "net0"
ioeventfd = false
vectors = 3 (0x3)
virtio-pci-bus-master-bug-migration = false
disable-legacy = true
disable-modern = false
OVMF just no able to boot from it.
Expected results:
OVMF able to boot from virtio-1.0 modern devices.
Additional info:
I acknowledge this as a feature request, so I'm leaving the BZ open. But, this feature would require immense work in OVMF, with absolutely minimal benefit. Simply remove the "disable-legacy=on" device property from the QEMU command line, and everything will work (the firmware will use the pre-1.0 virtio protocol, while the kernel will use the 1.0 protocol).
I recommend checking out Michael Tsirkin's virtio presentation from the KVM Forum 2015:
http://events.linuxfoundation.org/sites/events/files/slides/misha2015-v1.pdf
I attended that presentation and looked very carefully for signs that would require OVMF to support this. I found none. See especially slide #20 (-> compatibility is guaranteed) and slide #27 (-> the only reason for doing it is "improved robustness", which does not justify the immense amount of work it would take.)
So, just drop "disable-legacy=on". The expected result ("OVMF able to boot from virtio-1.0 modern devices") is ensured by default, using the parallel legacy interface, *unless* you explicitly prevent OVMF from doing that.
Setting Prio / Sev to Low, and Devel Cond-NAK to Capacity.
Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.
For information on the advisory, and where to find the updated
files, follow the link below.
If the solution does not work for you, open a new bug report.
https://rhn.redhat.com/errata/RHBA-2016-2608.html
Description of problem: virtio-1.0 has finalized spec, and drivers are already included in RHEL kernel. while booting still no possible due to firmware dont recognize them yet. Version-Release number of selected component (if applicable): OVMF-20150414-2.gitc9e5618.el7.noarch qemu-kvm-rhev-2.3.0-18.el7.x86_64 How reproducible: 1/1 Steps to Reproduce: 1. boot a vm with virtio-1.0 modern mode only -netdev tap,id=hostnet0,vhost=on \ -device virtio-net-pci,netdev=hostnet0,id=net0,mac=52:54:00:17:89:55,bus=pci.2,addr=0x1,disable-legacy=on,disable-modern=off 2. 3. Actual results: dev: virtio-net-pci, id "net0" ioeventfd = false vectors = 3 (0x3) virtio-pci-bus-master-bug-migration = false disable-legacy = true disable-modern = false OVMF just no able to boot from it. Expected results: OVMF able to boot from virtio-1.0 modern devices. Additional info: