Re: [PATCH v2 0/2] s390x/kvm: Add ASTFLE facility 2 for nested virtualization

["Christoph Schlameuss" <schlameuss@linux.ibm.com>]

On Wed May 27, 2026 at 2:19 PM CEST, Cornelia Huck wrote:
> On Tue, Mar 24 2026, Christoph Schlameuss <schlameuss@linux.ibm.com> wrote:
>
>> Update the kernel headers to get access to
>> KVM_S390_VM_CPU_FEAT_ASTFLEIE2 and allow passing the feature through to
>> guest on IBM z16 onwards.
>>
>> Cc: qemu-devel@nongnu.org
>> Cc: Halil Pasic <pasic@linux.ibm.com>
>> Cc: Christian Borntraeger <borntraeger@linux.ibm.com>
>> Cc: Eric Farman <farman@linux.ibm.com>
>> Cc: Matthew Rosato <mjrosato@linux.ibm.com>
>> Cc: Richard Henderson <richard.henderson@linaro.org>
>> Cc: Ilya Leoshkevich <iii@linux.ibm.com>
>> Cc: Thomas Huth <thuth@redhat.com>
>> Cc: Michael S. Tsirkin <mst@redhat.com>
>> Cc: Cornelia Huck <cohuck@redhat.com>
>> Cc: Paolo Bonzini <pbonzini@redhat.com>
>> Cc: Hendrik Brueckner <brueckner@linux.ibm.com>
>> To: qemu-s390x@nongnu.org
>> Cc: kvm@vger.kernel.org
>>
>> Signed-off-by: Christoph Schlameuss <schlameuss@linux.ibm.com>
>> ---
>> Changes in v2:
>> - Isolate the linux-header update into its own commit (thanks Thomas)
>> - Correct naming of the feature (thanks Hendrik)
>> - Add S390_FEAT_SIE_ASTFLEIE2 to full_GEN16_GA1 only as it depends on
>>   SIEF2 (thanks Christian)
>>
>> ---
>> Christoph Schlameuss (2):
>>       linux-headers: Update to Linux v7.x with KVM_S390_VM_CPU_FEAT_ASTFLEIE2
>>       s390x/kvm: Add ASTFLE facility 2 for nested virtualization
>>
>>  hw/s390x/sclp.c                     | 2 ++
>>  include/hw/s390x/sclp.h             | 4 +++-
>>  linux-headers/asm-s390/kvm.h        | 1 +
>>  target/s390x/cpu_features.c         | 3 +++
>>  target/s390x/cpu_features.h         | 1 +
>>  target/s390x/cpu_features_def.h.inc | 3 +++
>>  target/s390x/cpu_models.c           | 2 ++
>>  target/s390x/gen-features.c         | 1 +
>>  target/s390x/kvm/kvm.c              | 1 +
>>  9 files changed, 17 insertions(+), 1 deletion(-)
>> ---
>> base-commit: fa4b2e31e649ba6fdb3eb2dd43952aad4a3bd675
>> change-id: 20260209-astfleie2-85eec9fd9213
>>
>> Best regards,
>> -- 
>> Christoph Schlameuss <schlameuss@linux.ibm.com>
>
> Looking through old emails: Can we respin with a proper headers update by
> now, or is the kernel change still pending? (Or did I miss an update? :)

The kernel change is still pending. I will respin this as soon as the kernel
part is out.