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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 /include/linux | |
| parent | d6b6d166864fa97ca3b1ed1a5c62fd3b53d4606f (diff) | |
| download | linux-3.10-ccc7910fe564d99415def7c041fa261e62a43011.tar.gz linux-3.10-ccc7910fe564d99415def7c041fa261e62a43011.tar.bz2 linux-3.10-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 'include/linux')
| -rw-r--r-- | include/linux/kvm.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/include/linux/kvm.h b/include/linux/kvm.h index 8f888df206a..778e748927b 100644 --- a/include/linux/kvm.h +++ b/include/linux/kvm.h @@ -675,6 +675,7 @@ struct kvm_s390_ucas_mapping { }; #define KVM_S390_UCAS_MAP _IOW(KVMIO, 0x50, struct kvm_s390_ucas_mapping) #define KVM_S390_UCAS_UNMAP _IOW(KVMIO, 0x51, struct kvm_s390_ucas_mapping) +#define KVM_S390_VCPU_FAULT _IOW(KVMIO, 0x52, unsigned long) /* Device model IOC */ #define KVM_CREATE_IRQCHIP _IO(KVMIO, 0x60) |