linux-kernel - [PATCH v4 0/4] KVM: s390: Enable AP instructions for PV-guests

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Date:   Tue, 15 Aug 2023 17:14:11 +0200
From:   Steffen Eiden <seiden@...ux.ibm.com>
To:     linux-kernel@...r.kernel.org, linux-s390@...r.kernel.org,
        kvm@...r.kernel.org
Cc:     Janosch Frank <frankja@...ux.ibm.com>,
        Claudio Imbrenda <imbrenda@...ux.ibm.com>,
        David Hildenbrand <david@...hat.com>,
        Michael Mueller <mimu@...ux.vnet.ibm.com>,
        Marc Hartmayer <mhartmay@...ux.ibm.com>,
        Christian Borntraeger <borntraeger@...ux.ibm.com>,
        Viktor Mihajlovski <mihajlov@...ux.ibm.com>
Subject: [PATCH v4 0/4] KVM: s390: Enable AP instructions for PV-guests

This series enables general KVM support for AP-passthrough for Secure
Execution guests (PV-guests).

To enable AP inside PV-guests two things have to be done/considered:
	1) set corresponding flags in the Create Secure Configuration UVC if
     firmware supports AP for PV-guests (patch 4).
	2) enable/disable AP in PV-guests if the VMM wants this (patch 3).

since v3:
  - add a patch from Viktor that handles a new rc that can occur with AP-pt.
  - remove KVM_S390_VM_CPU_UV_FEAT_GUEST_DEFAULT define (Janosch)
  - add a boundary check in uv_has_feature() (Janosch)
  - add r-b from Janosch

since v2:
  - applied styling recommendations from Heiko

since v1:
  - PATCH 1: r-b from Claudio
  - PATCH 2: fixed formatting issues (Claudio)
  - PATCH 3: removed unnecessary checks (Claudio)

Steffen

Steffen Eiden (3):
  s390: uv: UV feature check utility
  KVM: s390: Add UV feature negotiation
  KVM: s390: pv:  Allow AP-instructions for pv-guests

Viktor Mihajlovski (1):
  KVM: s390: pv: relax WARN_ONCE condition for destroy fast

 arch/s390/include/asm/kvm_host.h |  2 +
 arch/s390/include/asm/uv.h       | 19 +++++++-
 arch/s390/include/uapi/asm/kvm.h | 16 +++++++
 arch/s390/kernel/uv.c            |  2 +-
 arch/s390/kvm/kvm-s390.c         | 75 +++++++++++++++++++++++++++++++-
 arch/s390/kvm/pv.c               |  9 ++--
 arch/s390/mm/fault.c             |  2 +-
 7 files changed, 118 insertions(+), 7 deletions(-)

-- 
2.41.0