Re: [PATCH v3 12/12] KVM: s390: allow to change the IAM clear strategy dynamically

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On Wed, 28 Nov 2018 11:19:43 +0100
Michael Mueller <mimu@xxxxxxxxxxxxx> wrote:

> The sysctl file /proc/sys/s390/iam_clear_strategy defines under which
> condition the GISA IAM is cleared before entering the SIE in routine
> vcpu_pre_run().
> 
> The following IAM clear strategies are available:
> 
>   0 : the mask is never cleared
>   1 : the mask is cleared if I/O interruptions are not
>       disabled by the PSW of the vcpu entering the SIE
>   2 : the mask is unconditionally cleared
> 
> The default IAM clear strategy after system boot is 0.
> 
> Set the new strategy by means of the sysctl command or write to the file.
> 
>   sysctl s390.iam_clear_strategy=1
>   echo 2 >/proc/sys/s390/iam_clear_strategy

This wants some documentation, I think. How is the admin supposed to
know which strategy to choose?

> 
> Signed-off-by: Michael Mueller <mimu@xxxxxxxxxxxxx>
> ---
>  arch/s390/kvm/interrupt.c | 69 +++++++++++++++++++++++++++++++++++++++++++++++
>  arch/s390/kvm/kvm-s390.c  |  1 +
>  arch/s390/kvm/kvm-s390.h  |  1 +
>  3 files changed, 71 insertions(+)



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