Re: [PATCH v4 1/1] KVM: s390: diag9c (directed yield) forwarding

[Pierre Morel <pmorel@linux.ibm.com>]

On 2/23/21 12:14 PM, Cornelia Huck wrote:
> On Mon, 22 Feb 2021 13:41:01 +0100
> Pierre Morel <pmorel@linux.ibm.com> wrote:
> 
>> When we intercept a DIAG_9C from the guest we verify that the
>> target real CPU associated with the virtual CPU designated by
>> the guest is running and if not we forward the DIAG_9C to the
>> target real CPU.
>>
>> To avoid a diag9c storm we allow a maximal rate of diag9c forwarding.
>>
>> The rate is calculated as a count per second defined as a new
>> parameter of the s390 kvm module: diag9c_forwarding_hz .
>>
>> The default value of 0 is to not forward diag9c.
>>
>> Signed-off-by: Pierre Morel <pmorel@linux.ibm.com>
>> ---
>>   Documentation/virt/kvm/s390-diag.rst | 33 ++++++++++++++++++++++++++++
>>   arch/s390/include/asm/kvm_host.h     |  1 +
>>   arch/s390/include/asm/smp.h          |  1 +
>>   arch/s390/kernel/smp.c               |  1 +
>>   arch/s390/kvm/diag.c                 | 31 +++++++++++++++++++++++---
>>   arch/s390/kvm/kvm-s390.c             |  6 +++++
>>   arch/s390/kvm/kvm-s390.h             |  8 +++++++
>>   7 files changed, 78 insertions(+), 3 deletions(-)
> 
> Reviewed-by: Cornelia Huck <cohuck@redhat.com>
> 

Thanks,
Pierre

-- 
Pierre Morel
IBM Lab Boeblingen