KVM: s390: protvirt: Only sync fmt4 registers

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A lot of the registers are controlled by the Ultravisor and never
visible to KVM. Also some registers are overlayed, like gbea is with
sidad, which might leak data to userspace.

Hence we sync a minimal set of registers for both SIE formats and then
check and sync format 2 registers if necessary.

Signed-off-by: Janosch Frank <frankja@linux.ibm.com>
Reviewed-by: Cornelia Huck <cohuck@redhat.com>
Reviewed-by: David Hildenbrand <david@redhat.com>
[borntraeger@de.ibm.com: patch merging, splitting, fixing]
Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>

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Janosch Frank 2019-06-14 13:11:21 +02:00 • committed by Christian Borntraeger

parent 0f30350471

commit 811ea79711

1 changed files with 70 additions and 40 deletions

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arch/s390/kvm/kvm-s390.c

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