diff options
| author | Alexander Egorenkov <eaibmz@gmail.com> | 2025-07-01 08:22:44 +0200 |
|---|---|---|
| committer | Aleksandr Nogikh <nogikh@google.com> | 2025-07-01 11:33:20 +0000 |
| commit | 0452067d1acfab89dff5bebbae9791317dfc6f83 (patch) | |
| tree | f9709297040c19e3b3219520b9f0767424eb40a4 /vm | |
| parent | a073c096d4d2337ecef7371ff309953bc8455104 (diff) | |
vm/qemu: use virtio-net-ccw as virtual netdev on s390x arch
virtio-net-ccw is a preferred way to set up a virtual network interface on
s390x at the moment because it is faster than virtio-net-pci
(eventfd and irqfd is missing). This also allows disabling of zPCI in QEMU
which was required only because virtio-net-pci was used as a network
interface. PCI is special on s390x and, for instance, does not use MMIO or
expose topology [1,2,3]. Furthermore, any features like PXE are
not supported with virtio-net-pci on s390x.
[1] https://people.redhat.com/~cohuck/2018/02/19/notes-on-pci-on-s390x.html
[2] https://wiki.qemu.org/Documentation/Platforms/S390X#A_note_on_PCI_support
[3] https://www.qemu.org/docs/master/system/s390x/pcidevices.html
Signed-off-by: Alexander Egorenkov <eaibmz@gmail.com>
Diffstat (limited to 'vm')
| -rw-r--r-- | vm/qemu/qemu.go | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/vm/qemu/qemu.go b/vm/qemu/qemu.go index 3fb78e9fb..ba1ecf979 100644 --- a/vm/qemu/qemu.go +++ b/vm/qemu/qemu.go @@ -201,8 +201,8 @@ var archConfigs = map[string]*archConfig{ }, "linux/s390x": { Qemu: "qemu-system-s390x", - QemuArgs: "-M s390-ccw-virtio -cpu max,zpci=on", - NetDev: "virtio-net-pci", + QemuArgs: "-M s390-ccw-virtio -cpu max", + NetDev: "virtio-net-ccw", RngDev: "virtio-rng-ccw", CmdLine: []string{ "root=/dev/vda", |