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| author | Carsten Otte <cotte@de.ibm.com> | 2012-01-04 10:25:26 +0100 |
|---|---|---|
| committer | Avi Kivity <avi@redhat.com> | 2012-03-05 14:52:20 +0200 |
| commit | ccc7910fe564d99415def7c041fa261e62a43011 (patch) | |
| tree | 8895fd2463f7b4e48c4510284c37e84a1753ee0d /arch/s390 | |
| parent | d6b6d166864fa97ca3b1ed1a5c62fd3b53d4606f (diff) | |
| download | linux-ccc7910fe564d99415def7c041fa261e62a43011.tar.gz linux-ccc7910fe564d99415def7c041fa261e62a43011.tar.bz2 linux-ccc7910fe564d99415def7c041fa261e62a43011.zip | |
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>
Diffstat (limited to 'arch/s390')
| -rw-r--r-- | arch/s390/kvm/kvm-s390.c | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/arch/s390/kvm/kvm-s390.c b/arch/s390/kvm/kvm-s390.c index 5b5c28e471df..8489edf80c89 100644 --- a/arch/s390/kvm/kvm-s390.c +++ b/arch/s390/kvm/kvm-s390.c @@ -761,6 +761,12 @@ long kvm_arch_vcpu_ioctl(struct file *filp, break; } #endif + case KVM_S390_VCPU_FAULT: { + r = gmap_fault(arg, vcpu->arch.gmap); + if (!IS_ERR_VALUE(r)) + r = 0; + break; + } default: r = -EINVAL; } |