tree 8895fd2463f7b4e48c4510284c37e84a1753ee0d
parent d6b6d166864fa97ca3b1ed1a5c62fd3b53d4606f
author Carsten Otte <cotte@de.ibm.com> 1325669126 +0100
committer Avi Kivity <avi@redhat.com> 1330951940 +0200

KVM: s390: ucontrol: interface to inject faults on a vcpu page table

This patch allows the user to fault in pages on a virtual cpus
address space for user controlled virtual machines. Typically this
is superfluous because userspace can just create a mapping and
let the kernel's page fault logic take are of it. There is one
exception: SIE won't start if the lowcore is not present. Normally
the kernel takes care of this [handle_validity() in
arch/s390/kvm/intercept.c] but since the kernel does not handle
intercepts for user controlled virtual machines, userspace needs to
be able to handle this condition.

Signed-off-by: Carsten Otte <cotte@de.ibm.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
Signed-off-by: Avi Kivity <avi@redhat.com>