diff options
| author | Cédric Le Goater <clg@redhat.com> | 2022-11-07 17:13:49 +0100 |
|---|---|---|
| committer | Thomas Huth <thuth@redhat.com> | 2022-11-08 10:11:02 +0100 |
| commit | d3d1a406127f7da482eafbdc871c120c2770bb91 (patch) | |
| tree | 10bebc9e5fc43fca7d39bddd2e03d1965d88e9ec | |
| parent | 57702891376d4636b5eab4a89145152a0342c987 (diff) | |
s390x/s390-virtio-ccw: Switch off zPCI enhancements on older machines
zPCI enhancement features (interpretation and forward assist) were
recently introduced to improve performance on PCI passthrough devices.
To maintain the same behaviour on older Z machines, deactivate the
features with the associated properties.
Signed-off-by: Cédric Le Goater <clg@redhat.com>
Message-Id: <20221107161349.1032730-3-clg@kaod.org>
Reviewed-by: Matthew Rosato <mjrosato@linux.ibm.com>
Signed-off-by: Thomas Huth <thuth@redhat.com>
| -rw-r--r-- | hw/s390x/s390-virtio-ccw.c | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/hw/s390x/s390-virtio-ccw.c b/hw/s390x/s390-virtio-ccw.c index bb98d40792..7d80bc1837 100644 --- a/hw/s390x/s390-virtio-ccw.c +++ b/hw/s390x/s390-virtio-ccw.c @@ -844,9 +844,14 @@ static void ccw_machine_7_1_instance_options(MachineState *machine) static void ccw_machine_7_1_class_options(MachineClass *mc) { S390CcwMachineClass *s390mc = S390_CCW_MACHINE_CLASS(mc); + static GlobalProperty compat[] = { + { TYPE_S390_PCI_DEVICE, "interpret", "off", }, + { TYPE_S390_PCI_DEVICE, "forwarding-assist", "off", }, + }; ccw_machine_7_2_class_options(mc); compat_props_add(mc->compat_props, hw_compat_7_1, hw_compat_7_1_len); + compat_props_add(mc->compat_props, compat, G_N_ELEMENTS(compat)); s390mc->max_threads = S390_MAX_CPUS; } DEFINE_CCW_MACHINE(7_1, "7.1", false); |