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

Joseph Salisbury joseph.salisbury at canonical.com
Fri Feb 2 22:58:22 UTC 2018


On 02/02/2018 05:54 PM, 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(-)
>
This request is for Xenial.  I missed adding that to the subject. 
Artful and Bionic are in a seperate SRU request.





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