Re: [PATCH v4 0/4] KVM: s390: vsie: Implement ASTFLEIE facility 2

[Claudio Imbrenda <imbrenda@linux.ibm.com>]

On Fri, 12 Jun 2026 14:23:00 +0200
Christoph Schlameuss <schlameuss@linux.ibm.com> wrote:

> Add support for STFLE format 2 in VSIE guests.
> 
> The change requires qemu support to set the ASTFLEIE2 feature bit.
> ASTFLEIE2 is available since IBM z16.
> To function G1 has to run this KVM code and G1 and G2 have to run QEMU
> 
> Tests are implemented in kvm-unit-tests and sent as a series to that
> list.
> 
> Signed-off-by: Christoph Schlameuss <schlameuss@linux.ibm.com>

Series:
Reviewed-by: Claudio Imbrenda <imbrenda@linux.ibm.com>

with one nit in patch 4

> ---
> The series was originally developed by Nina and only rebased and
> slightly adjusted by me. It was not sent earlier since the accompanying
> kvm-unit-tests and qemu changes were not ready.
> 
> ---
> Changes in v4:
> - adjusted struct kvm_s390_flcb2 to make sure reserved0 is always 0
> 
> Changes in v3:
> - renamed struct kvm_s390_f2_flcb to kvm_s390_flcb2 as requested by
>   Janosch
> - rebased
> 
> Changes in v2:
> - adjusted variable naming in handle_stfle()
> - add some constants for readability
> - add struct for format-2 facility list control block
> - rebased to v7.0-rc1
> 
> ---
> Nina Schoetterl-Glausch (4):
>       KVM: s390: Minor refactor of base/ext facility lists
>       s390/sclp: Detect ASTFLEIE 2 facility
>       KVM: s390: vsie: Refactor handle_stfle
>       KVM: s390: vsie: Implement ASTFLEIE facility 2
> 
>  arch/s390/include/asm/kvm_host.h | 12 ++++++
>  arch/s390/include/asm/sclp.h     |  1 +
>  arch/s390/include/uapi/asm/kvm.h |  1 +
>  arch/s390/kvm/kvm-s390.c         | 46 ++++++++++------------
>  arch/s390/kvm/vsie.c             | 85 +++++++++++++++++++++++++++++++---------
>  drivers/s390/char/sclp_early.c   |  4 +-
>  6 files changed, 104 insertions(+), 45 deletions(-)
> ---
> base-commit: 0e5d0a0b5ca6ea4e391d6786266405c5871e0151
> change-id: 20260129-vsie-alter-stfle-fac-b3d28b948146
> 
> Best regards,