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s390x: Fence huge pages prior to 3.1

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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>
This commit is contained in:
Janosch Frank 2018-09-28 11:34:35 +02:00 • committed by Cornelia Huck
parent cb89b34907
commit 28221f9c99
3 changed files with 19 additions and 0 deletions
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3
include/hw/s390x/s390-virtio-ccw.h
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@ -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