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target/s390x/kvm: Enable adapter interruption suppression again

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The AIS feature has been disabled late in the v2.10 development cycle since
there were some issues with migration (see commit 3f2d07b3b0 -
"s390x/ais: for 2.10 stable: disable ais facility"). We originally wanted
to enable it again for newer machine types, but apparently we forgot to do
this so far. Let's do it now for the machines that support proper CPU models.

Buglink: https://bugzilla.redhat.com/show_bug.cgi?id=1756946
Signed-off-by: Thomas Huth <thuth@redhat.com>
Message-Id: <20200122101437.5069-1-thuth@redhat.com>
Reviewed-by: David Hildenbrand <david@redhat.com>
Tested-by: Matthew Rosato <mjrosato@linux.ibm.com>
Signed-off-by: Cornelia Huck <cohuck@redhat.com>
This commit is contained in:
Thomas Huth 2020-01-22 11:14:37 +01:00 committed by Cornelia Huck
parent 174b72aa38
commit a5c8617af6
1 changed files with 6 additions and 3 deletions
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9
target/s390x/kvm.c
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@ -365,10 +365,13 @@ int kvm_arch_init(MachineState *ms, KVMState *s)
/*
* The migration interface for ais was introduced with kernel 4.13
* but the capability itself had been active since 4.12. As migration
* support is considered necessary let's disable ais in the 2.10
* machine.
* support is considered necessary, we only try to enable this for
* newer machine types if KVM_CAP_S390_AIS_MIGRATION is available.
*/
/* kvm_vm_enable_cap(s, KVM_CAP_S390_AIS, 0); */
if (cpu_model_allowed() && kvm_kernel_irqchip_allowed() &&
kvm_check_extension(s, KVM_CAP_S390_AIS_MIGRATION)) {
kvm_vm_enable_cap(s, KVM_CAP_S390_AIS, 0);
}
kvm_set_max_memslot_size(KVM_SLOT_MAX_BYTES);
return 0;