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| author | Janosch Frank | 2018-09-28 11:34:35 +0200 |
|---|---|---|
| committer | Cornelia Huck | 2018-10-04 10:32:39 +0200 |
| commit | 28221f9c999a9b34f58d94599da9c229df9a4fed (patch) | |
| tree | 175191aa874838eae396108e6be32b2a289c58d6 /include/hw | |
| parent | hw/s390x/ioinst: Fix alignment problem in struct SubchDev (diff) | |
| download | qemu-28221f9c999a9b34f58d94599da9c229df9a4fed.tar.gz qemu-28221f9c999a9b34f58d94599da9c229df9a4fed.tar.xz qemu-28221f9c999a9b34f58d94599da9c229df9a4fed.zip | |
s390x: Fence huge pages prior to 3.1
As the kernel has no way of disallowing the start of a huge page
backed VM, we can migrate a running huge backed VM to a host that has
no huge page KVM support.
Let's glue huge page support support to the 3.1 machine, so we do not
migrate to a destination host that doesn't have QEMU huge page support
and can stop migration if KVM doesn't indicate support.
Signed-off-by: Janosch Frank <frankja@linux.ibm.com>
Message-Id: <20180928093435.198573-1-frankja@linux.ibm.com>
Reviewed-by: David Hildenbrand <david@redhat.com>
Signed-off-by: Cornelia Huck <cohuck@redhat.com>
Diffstat (limited to 'include/hw')
| -rw-r--r-- | include/hw/s390x/s390-virtio-ccw.h | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/include/hw/s390x/s390-virtio-ccw.h b/include/hw/s390x/s390-virtio-ccw.h index e9c4f4182b..8aa27199c9 100644 --- a/include/hw/s390x/s390-virtio-ccw.h +++ b/include/hw/s390x/s390-virtio-ccw.h @@ -39,12 +39,15 @@ typedef struct S390CcwMachineClass { bool ri_allowed; bool cpu_model_allowed; bool css_migration_enabled; + bool hpage_1m_allowed; } S390CcwMachineClass; /* runtime-instrumentation allowed by the machine */ bool ri_allowed(void); /* cpu model allowed by the machine */ bool cpu_model_allowed(void); +/* 1M huge page mappings allowed by the machine */ +bool hpage_1m_allowed(void); /** * Returns true if (vmstate based) migration of the channel subsystem |