netdev - [RFC PATCH v2 0/6] Enable ptp

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Date:   Tue, 17 Sep 2019 07:24:24 -0400
From:   Jianyong Wu <jianyong.wu@....com>
To:     netdev@...r.kernel.org, pbonzini@...hat.com,
        sean.j.christopherson@...el.com, maz@...nel.org,
        richardcochran@...il.com, Mark.Rutland@....com,
        Will.Deacon@....com, suzuki.poulose@....com
Cc:     linux-kernel@...r.kernel.org, Steve.Capper@....com,
        Kaly.Xin@....com, justin.he@....com, jianyong.wu@....com,
        nd@....com, linux-arm-kernel@...ts.infradead.org
Subject: [RFC PATCH v2 0/6] Enable ptp_kvm for arm64

kvm ptp targets to provide high precision time sync between guest
and host in virtualization environment. This patch enable kvm ptp
for arm64.
This patch set base on [1][2][3]

change log:
from v1 to v2:
        (1) move arch-specific code from arch/ to driver/ptp/
        (2) offer mechanism to inform userspace if ptp_kvm service is
available.
        (3) separate ptp_kvm code for arm64 into hypervisor part and
guest part.
        (4) add API to expose monotonic clock and counter value.
        (5) refine code: remove no necessary part and reconsitution.

[1]https://git.kernel.org/pub/scm/linux/kernel/git/will/linux.git/
commit/?h=kvm/hvc&id=125ea89e4a21e2fc5235410f966a996a1a7148bf
[2]https://git.kernel.org/pub/scm/linux/kernel/git/will/linux.git/
commit/?h=kvm/hvc&id=464f5a1741e5959c3e4d2be1966ae0093b4dce06
[3]https://git.kernel.org/pub/scm/linux/kernel/git/will/linux.git/
commit/?h=kvm/hvc&id=6597490e005d0eeca8ed8c1c1d7b4318ee014681

Jianyong Wu (6):
  Export psci_ops.conduit symbol as modules will use it.
  reorganize ptp_kvm modules to make it arch-independent.
  Timer: expose monotonic clock and counter value
  arm64: Add hvc call service for ptp_kvm.
  Enable ptp_kvm for arm64
  kvm: add kvm ptp capability extension for arm64

 drivers/firmware/psci/psci.c         |  6 ++
 drivers/ptp/Kconfig                  |  2 +-
 drivers/ptp/Makefile                 |  1 +
 drivers/ptp/{ptp_kvm.c => kvm_ptp.c} | 77 ++++++------------------
 drivers/ptp/ptp_kvm_arm64.c          | 82 ++++++++++++++++++++++++++
 drivers/ptp/ptp_kvm_x86.c            | 87 ++++++++++++++++++++++++++++
 include/asm-generic/ptp_kvm.h        | 12 ++++
 include/linux/arm-smccc.h            | 14 ++++-
 include/linux/psci.h                 |  1 +
 include/linux/timekeeping.h          |  3 +
 include/uapi/linux/kvm.h             |  1 +
 kernel/time/timekeeping.c            | 13 +++++
 virt/kvm/arm/arm.c                   |  1 +
 virt/kvm/arm/psci.c                  | 17 ++++++
 14 files changed, 256 insertions(+), 61 deletions(-)
 rename drivers/ptp/{ptp_kvm.c => kvm_ptp.c} (63%)
 create mode 100644 drivers/ptp/ptp_kvm_arm64.c
 create mode 100644 drivers/ptp/ptp_kvm_x86.c
 create mode 100644 include/asm-generic/ptp_kvm.h

-- 
2.17.1