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s390x/s390-virtio-ccw: Switch off zPCI enhancements on older machines

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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>
This commit is contained in:
Cédric Le Goater 2022-11-07 17:13:49 +01:00 committed by Thomas Huth
parent 5770289137
commit d3d1a40612
1 changed files with 5 additions and 0 deletions
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hw/s390x/s390-virtio-ccw.c
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@ -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);