ACK: [SRU][R][PATCH 0/5] IBM Test Accelerator for Z (TAZ) not working properly

[Ross Porter]

Acked-by: Ross Porter <ross.porter at canonical.com>

On 28/05/2026 10:48, Massimiliano Pellizzer wrote:
> BugLink: https://bugs.launchpad.net/bugs/2153159
>
> [ Impact ]
>
> Enable IBM Test Accelerator for Z.
>
> [ Fix ]
>
> Backport the following patches from upstream:
> - 2623c96f1172 KVM: s390: only deliver service interrupt with payload
> - b0ad874d9852 KVM: s390: vsie: Allow non-zarch guests
> - a9640e2eb711 KVM: s390: vsie: Disable some bits when in ESA mode
> - c0dcada088ff KVM: s390: vsie: Accommodate ESA prefix pages
> - 4aebd7d5c72f KVM: s390: Add KVM capability for ESA mode guests
>
> [ Test Plan ]
>
> Launch a TAZ instance and confirm it can start
> and run ESA mode nested guests without generating program exceptions
> in either the TAZ instance or its guests.
>
> [ Regression Potential]
>
> While the ESA mode enablement is fully opt-in and poses no risk
> to existing workloads, the prefix bitfield adjustment
> and the suppression of zero-payload SCLP interrupts are global changes
> affecting all KVM/s390 guests.
> Either could impact existing z/Architecture guests.
>
> Eric Farman (4):
>    KVM: s390: only deliver service interrupt with payload
>    KVM: s390: vsie: Allow non-zarch guests
>    KVM: s390: vsie: Disable some bits when in ESA mode
>    KVM: s390: vsie: Accommodate ESA prefix pages
>
> Hendrik Brueckner (1):
>    KVM: s390: Add KVM capability for ESA mode guests
>
>   Documentation/virt/kvm/api.rst         |  8 +++++++
>   arch/s390/include/asm/kvm_host.h       |  1 +
>   arch/s390/include/asm/kvm_host_types.h |  3 +--
>   arch/s390/kvm/interrupt.c              |  3 +++
>   arch/s390/kvm/kvm-s390.c               |  6 ++++++
>   arch/s390/kvm/kvm-s390.h               |  5 ++++-
>   arch/s390/kvm/vsie.c                   | 29 ++++++++++++++++++++++----
>   include/uapi/linux/kvm.h               |  1 +
>   8 files changed, 49 insertions(+), 7 deletions(-)
>