From: Cornelia Huck <cohuck@redhat.com>
To: Thomas Huth <thuth@redhat.com>
Cc: Halil Pasic <pasic@linux.ibm.com>,
Christian Borntraeger <borntraeger@de.ibm.com>,
qemu-s390x@nongnu.org, qemu-devel@nongnu.org,
David Hildenbrand <david@redhat.com>
Subject: Re: [PATCH] target/s390x/kvm: Enable adapter interruption suppression again
Date: Thu, 16 Jan 2020 13:50:38 +0100 [thread overview]
Message-ID: <20200116135038.2c8cf3c6.cohuck@redhat.com> (raw)
In-Reply-To: <20200116122026.5804-1-thuth@redhat.com>
On Thu, 16 Jan 2020 13:20:26 +0100
Thomas Huth <thuth@redhat.com> wrote:
> 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 for the new s390-ccw-virtio-5.0 machine now.
>
> Buglink: https://bugzilla.redhat.com/show_bug.cgi?id=1756946
> Signed-off-by: Thomas Huth <thuth@redhat.com>
> ---
> hw/s390x/s390-virtio-ccw.c | 4 ++++
> include/hw/s390x/s390-virtio-ccw.h | 4 ++++
> target/s390x/kvm.c | 11 ++++++++---
> 3 files changed, 16 insertions(+), 3 deletions(-)
>
> @@ -365,10 +367,13 @@ 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 enable this for newer
s/necessary we only enable this/necessary, we only try to enable this/
> + * machine types and if KVM_CAP_S390_AIS_MIGRATION is available.
maybe s/and if/if/
> */
> - /* kvm_vm_enable_cap(s, KVM_CAP_S390_AIS, 0); */
> + if (smc->kvm_ais_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;
Looks good.
Remind me again: ais only made a difference for pci devices, right? Is
it enough to give this a quick whirl with virtio-pci devices?
next prev parent reply other threads:[~2020-01-16 12:51 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-01-16 12:20 [PATCH] target/s390x/kvm: Enable adapter interruption suppression again Thomas Huth
2020-01-16 12:23 ` David Hildenbrand
2020-01-16 12:26 ` Thomas Huth
2020-01-16 12:28 ` David Hildenbrand
2020-01-16 12:38 ` Thomas Huth
2020-01-16 12:50 ` Cornelia Huck [this message]
2020-01-16 12:55 ` Thomas Huth
2020-01-16 13:22 ` Christian Borntraeger
2020-01-16 14:22 ` Cornelia Huck
2020-01-16 14:51 ` Matthew Rosato
2020-01-16 20:19 ` Matthew Rosato
2020-01-16 20:26 ` Cornelia Huck
2020-01-17 10:38 ` Thomas Huth
2020-01-17 11:05 ` Christian Borntraeger
2020-01-17 15:38 ` Thomas Huth
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