>> arch/s390/include/asm/kvm.h | 9 +++++++++
>> arch/s390/kvm/kvm-s390.c | 24 ++++++++++++++++++++++++
>> include/linux/kvm.h | 4 ++++
>> 3 files changed, 37 insertions(+)
>
> The lack of documentation is not.
Ok, will do.
>
>
>> @@ -673,6 +674,29 @@ long kvm_arch_vcpu_ioctl(struct file *fi
>> case KVM_S390_INITIAL_RESET:
>> r = kvm_arch_vcpu_ioctl_initial_reset(vcpu);
>> break;
>> + case KVM_S390_GET_SREGS2: {
>> + struct kvm_s390_sregs2 sregs2;
>> +
>> + sregs2.prefix = vcpu->arch.sie_block->prefix;
>> + sregs2.gbea = vcpu->arch.sie_block->gbea;
>> + sregs2.cputm = vcpu->arch.sie_block->cputm;
>> + sregs2.ckc = vcpu->arch.sie_block->ckc;
>> + sregs2.todpr = vcpu->arch.sie_block->todpr;
>> + r = copy_to_user(argp, &sregs2, sizeof(sregs2));
>
> Need to return -EFAULT, not the number of remaining bytes to copy.
Will fix.
>> + case KVM_S390_SET_SREGS2: {
>> + struct kvm_s390_sregs2 sregs2;
>> +
>> + vcpu->arch.sie_block->prefix = sregs2.prefix;
>> + vcpu->arch.sie_block->gbea = sregs2.gbea;
>> + vcpu->arch.sie_block->cputm = sregs2.cputm;
>> + vcpu->arch.sie_block->ckc = sregs2.ckc;
>> + vcpu->arch.sie_block->todpr = sregs2.todpr;
>
> Copying uninitialized data.
>
>> + r = copy_from_user(&sregs2, argp, sizeof(sregs2));
>
> Then initializing it.
Hmm, a brown paper bag bug. Since life migration does not yet work
I only tested the get case (via dump). Sorry about that.
>
>> + vcpu->arch.sie_block->ihcpu = 0xffff;
>
> What's this?
tlb flush. Necessary after setting the prefix register.
Thanks
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