KVM: s390: enable SIMD only when no VCPUs were created

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commit 5967c17b11 upstream.

We should never allow to enable/disable any facilities for the guest
when other VCPUs were already created.

kvm_arch_vcpu_(load|put) relies on SIMD not changing during runtime.
If somebody would create and run VCPUs and then decides to enable
SIMD, undefined behaviour could be possible (e.g. vector save area
not being set up).

Acked-by: Christian Borntraeger <borntraeger@de.ibm.com>
Acked-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Signed-off-by: David Hildenbrand <dahi@linux.vnet.ibm.com>
Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

...

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David Hildenbrand 2015-11-06 12:08:48 +01:00 • committed by Greg Kroah-Hartman

parent 5051ab9f8d

commit 3f11689e16

1 changed files with 5 additions and 1 deletions

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arch/s390/kvm/kvm-s390.c

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