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

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On 2/23/21 12:14 PM, Cornelia Huck wrote:
On Mon, 22 Feb 2021 13:41:01 +0100
Pierre Morel <pmorel@xxxxxxxxxxxxx> 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@xxxxxxxxxxxxx>
---
  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@xxxxxxxxxx>


Thanks,
Pierre

--
Pierre Morel
IBM Lab Boeblingen



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