This check verifies that the guest we're trying to run in KVM_RUN
has some memory assigned to it. It enters an endless exception
loop if this is not the case.
Reported-by: Mijo Safradin <mijo@xxxxxxxxxxxxxxxxxx>
Signed-off-by: Carsten Otte <cotte@xxxxxxxxxx>
---
arch/s390/kvm/kvm-s390.c | 6 ++++++
1 file changed, 6 insertions(+)
Index: kvm/arch/s390/kvm/kvm-s390.c
===================================================================
--- kvm.orig/arch/s390/kvm/kvm-s390.c
+++ kvm/arch/s390/kvm/kvm-s390.c
@@ -481,6 +481,12 @@ int kvm_arch_vcpu_ioctl_run(struct kvm_v
vcpu_load(vcpu);
+ /* verify, that memory has been registered */
+ if (!vcpu->kvm->arch.guest_memsize) {
+ vcpu_put(vcpu);
+ return -EINVAL;
+ }
+
if (vcpu->sigset_active)
sigprocmask(SIG_SETMASK, &vcpu->sigset, &sigsaved);
--
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