ACK/cmnt: [PATCH 0/2] KVM enablement for facility bit 81 and 82

[Stefan Bader]

On 02.02.2018 23:54, Joseph Salisbury wrote:
> From: Christian Borntraeger <borntraeger at de.ibm.com>
> 
> BugLink: http://bugs.launchpad.net/bugs/1747090
> 
> == SRU Justification ==
> Mainline commit 35b3fde6203b9 is a KVM patch for s390x to provide
> facility bits 81 (ppa15) and 82 (bpb).  This is required for branch prediction
> behaviour changes.
> 
> This is the public bug for SRU.  There is also a priave bug report:
> http://bugs.launchpad.net/bugs/1743560
> 
> There is a qemu portion to this fix:
> http://patchwork.ozlabs.org/cover/862801/
> 
> This fix is also requred in Artful and Bionic, but Xenial requires a prereq commit,
> so it is being SRU'd separatly.
> 
> == Fixes ==
> ed8dda0bf74b ("Enable all facility bits that are known good for passthrough")
> 35b3fde6203b ("KVM: s390: wire up bpb feature")
> 
> 
> == Regression Potential ==
> Low, this fix is limited to s390.
> 
> == Test Case ==
> A test kernel was built with these patches and tested by the original bug
> reporter.  The bug reporter states the test kernel resolved the bug.
> 
> 
> 
> Alexander Yarygin (1):
>   KVM: s390: Enable all facility bits that are known good for
>     passthrough
> 
> Christian Borntraeger (1):
>   KVM: s390: wire up bpb feature
> 
>  arch/s390/include/asm/kvm_host.h |  3 ++-
>  arch/s390/include/uapi/asm/kvm.h |  3 +++
>  arch/s390/kvm/kvm-s390.c         | 16 ++++++++++++++--
>  include/uapi/linux/kvm.h         |  1 +
>  4 files changed, 20 insertions(+), 3 deletions(-)
> 

Isolated to arch and testable (also requested by vendor). Joe, this sounds like
it something that should be tracked to go into the Xenial point release. Please
make sure that we add it to the board if that is true.

Acked-by: Stefan Bader <stefan.bader at canonical.com>


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