linux-kernel - [PATCH v2 0/2] s390x: KVM: CPU Topology

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Message-Id: <1626973353-17446-1-git-send-email-pmorel@linux.ibm.com>
Date:   Thu, 22 Jul 2021 19:02:31 +0200
From:   Pierre Morel <pmorel@...ux.ibm.com>
To:     kvm@...r.kernel.org
Cc:     linux-s390@...r.kernel.org, linux-kernel@...r.kernel.org,
        borntraeger@...ibm.com, frankja@...ux.ibm.com, cohuck@...hat.com,
        david@...hat.com, thuth@...hat.com, imbrenda@...ux.ibm.com,
        hca@...ux.ibm.com, gor@...ux.ibm.com, pmorel@...ux.ibm.com
Subject: [PATCH v2 0/2] s390x: KVM: CPU Topology

To provide Topology information to the guest through the STSI
instruction, we need to forward STSI with Function Code 15 to
QEMU which will take care to provide the right information to
the guest.

To let the guest use the PTF instruction and ask if a topology
change occured we add a new KVM capability to enable the topology
facility.


Pierre Morel (2):
  s390x: KVM: accept STSI for CPU topology information
  s390:kvm: Topology expose TOPOLOGY facility

 arch/s390/kvm/kvm-s390.c | 1 +
 arch/s390/kvm/priv.c     | 7 ++++++-
 include/uapi/linux/kvm.h | 1 +
 3 files changed, 8 insertions(+), 1 deletion(-)

-- 
2.25.1

Changelog:

- Add a KVM capability to let QEMU know we support PTF and STSI 15
  (David)

- check KVM facility 11 before accepting STSI fc 15
  (David)

- handle all we can in userland
  (David)

- add tracing to STSI fc 15
  (Connie)