Re: [PATCH v4 12/36] KVM: s390: protvirt: Handle SE notification interceptions

Cornelia Huck
2020-02-25T11:11:18Z

On Mon, 24 Feb 2020 06:40:43 -0500
Christian Borntraeger <borntraeger@de.ibm.com> wrote:

> From: Janosch Frank <frankja@linux.ibm.com>
>
> Since there is no interception for load control and load psw
> instruction in the protected mode, we need a new way to get notified
> whenever we can inject an IRQ right after the guest has just enabled
> the possibility for receiving them.
>
> The new interception codes solve that problem by providing a
> notification for changes to IRQ enablement relevant bits in CRs 0, 6
> and 14, as well a the machine check mask bit in the PSW.
>
> No special handling is needed for these interception codes, the KVM
> pre-run code will consult all necessary CRs and PSW bits and inject
> IRQs the guest is enabled for.
>
> Signed-off-by: Janosch Frank <frankja@linux.ibm.com>
> Reviewed-by: David Hildenbrand <david@redhat.com>
> Reviewed-by: Thomas Huth <thuth@redhat.com>
> [borntraeger@de.ibm.com: patch merging, splitting, fixing]
> Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
> ---
> arch/s390/include/asm/kvm_host.h | 2 ++
> arch/s390/kvm/intercept.c | 11 ++++++++++-
> 2 files changed, 12 insertions(+), 1 deletion(-)

Reviewed-by: Cornelia Huck <cohuck@redhat.com>