From: Carsten Otte <cotte@de.ibm.com>
Date: Wed, 4 Jan 2012 09:25:26 +0000 (+0100)
Subject: KVM: s390: ucontrol: interface to inject faults on a vcpu page table
X-Git-Tag: v3.4-rc1~59^2~120
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=ccc7910fe564d99415def7c041fa261e62a43011;p=pandora-kernel.git

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>
---

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