[PATCH 0/2] KVM enablement for facility bit 81 and 82
khalid.elmously at canonical.com
Thu Feb 8 18:55:42 UTC 2018
On 2018-02-02 17:58:22 , Joseph Salisbury wrote:
> 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.
I'm curious how you realized that you need a pre-requisite commit (given that the desired commit would have applied more-or-less cleanly anyway as it did for artful)? Was that by testing?
The patchset doesn't look wrong to me at all, I'm just asking for my general knowledge.
> kernel-team mailing list
> kernel-team at lists.ubuntu.com
More information about the kernel-team