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| author | Thomas Huth <thuth@redhat.com> | 2020-01-22 11:14:37 +0100 |
|---|---|---|
| committer | Cornelia Huck <cohuck@redhat.com> | 2020-01-27 12:13:09 +0100 |
| commit | a5c8617af6919515b84256978452edf07401c45e (patch) | |
| tree | ec041cb543a49ab707d0b8f918f2e893892308ef /target | |
| parent | 174b72aa38df8b60eb624a5c6f65126fa62bc6d6 (diff) | |
| download | qemu-a5c8617af6919515b84256978452edf07401c45e.zip qemu-a5c8617af6919515b84256978452edf07401c45e.tar.gz qemu-a5c8617af6919515b84256978452edf07401c45e.tar.bz2 | |
target/s390x/kvm: Enable adapter interruption suppression again
The AIS feature has been disabled late in the v2.10 development cycle since
there were some issues with migration (see commit 3f2d07b3b01ea61126b -
"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>
Diffstat (limited to 'target')
| -rw-r--r-- | target/s390x/kvm.c | 9 |
1 files changed, 6 insertions, 3 deletions
diff --git a/target/s390x/kvm.c b/target/s390x/kvm.c index 15260ae..30112e5 100644 --- a/target/s390x/kvm.c +++ b/target/s390x/kvm.c @@ -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; |