linux-kernel - [PATCH v3 0/4] KVM: PPC: Power10 2nd DAWR enablement

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Date:   Wed, 16 Dec 2020 16:12:15 +0530
From:   Ravi Bangoria <ravi.bangoria@...ux.ibm.com>
To:     mpe@...erman.id.au, paulus@...ba.org
Cc:     ravi.bangoria@...ux.ibm.com, mikey@...ling.org, npiggin@...il.com,
        leobras.c@...il.com, pbonzini@...hat.com, christophe.leroy@....fr,
        jniethe5@...il.com, kvm@...r.kernel.org, kvm-ppc@...r.kernel.org,
        linux-kernel@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org
Subject: [PATCH v3 0/4] KVM: PPC: Power10 2nd DAWR enablement

Enable p10 2nd DAWR feature for Book3S kvm guest. DAWR is a hypervisor
resource and thus H_SET_MODE hcall is used to set/unset it. A new case
H_SET_MODE_RESOURCE_SET_DAWR1 is introduced in H_SET_MODE hcall for
setting/unsetting 2nd DAWR. Also, new capability KVM_CAP_PPC_DAWR1 has
been added to query 2nd DAWR support via kvm ioctl.

This feature also needs to be enabled in Qemu to really use it. I'll
post Qemu patches once kvm patches get accepted.

v2: https://lore.kernel.org/kvm/20201124105953.39325-1-ravi.bangoria@linux.ibm.com

v2->v3:
 - Patch #1. If L0 version > L1, L0 hv_guest_state will contain some
   additional fields which won't be filled while reading from L1
   memory and thus they can contain garbage. Initialize l2_hv with 0s
   to avoid such situations.
 - Patch #3. Introduce per vm flag dawr1_enabled.
 - Patch #4. Instead of auto enabling KVM_CAP_PPC_DAWR1, let user check
   and enable it manually. Also move KVM_CAP_PPC_DAWR1 check / enable
   logic inside #if defined(CONFIG_KVM_BOOK3S_HV_POSSIBLE).
 - Explain KVM_CAP_PPC_DAWR1 in Documentation/virt/kvm/api.rst 
 - Rebased on top of 5.10-rc3.

v1->v2:
 - patch #1: New patch
 - patch #2: Don't rename KVM_REG_PPC_DAWR, it's an uapi macro
 - patch #3: Increment HV_GUEST_STATE_VERSION
 - Split kvm and selftests patches into different series
 - Patches rebased to paulus/kvm-ppc-next (cf59eb13e151) + few
   other watchpoint patches which are yet to be merged in
   paulus/kvm-ppc-next.

Ravi Bangoria (4):
  KVM: PPC: Allow nested guest creation when L0 hv_guest_state > L1
  KVM: PPC: Rename current DAWR macros and variables
  KVM: PPC: Add infrastructure to support 2nd DAWR
  KVM: PPC: Introduce new capability for 2nd DAWR

 Documentation/virt/kvm/api.rst            | 12 ++++
 arch/powerpc/include/asm/hvcall.h         | 25 ++++++-
 arch/powerpc/include/asm/kvm_host.h       |  7 +-
 arch/powerpc/include/asm/kvm_ppc.h        |  1 +
 arch/powerpc/include/uapi/asm/kvm.h       |  2 +
 arch/powerpc/kernel/asm-offsets.c         |  6 +-
 arch/powerpc/kvm/book3s_hv.c              | 79 +++++++++++++++++++----
 arch/powerpc/kvm/book3s_hv_nested.c       | 70 ++++++++++++++++----
 arch/powerpc/kvm/book3s_hv_rmhandlers.S   | 43 +++++++++---
 arch/powerpc/kvm/powerpc.c                | 10 +++
 include/uapi/linux/kvm.h                  |  1 +
 tools/arch/powerpc/include/uapi/asm/kvm.h |  2 +
 tools/include/uapi/linux/kvm.h            |  1 +
 13 files changed, 216 insertions(+), 43 deletions(-)

-- 
2.26.2