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Date: Mon, 6 Jan 2020 09:38:23 +0000 From: Jianyong Wu <Jianyong.Wu@....com> To: Jianyong Wu <Jianyong.Wu@....com>, "netdev@...r.kernel.org" <netdev@...r.kernel.org>, "yangbo.lu@....com" <yangbo.lu@....com>, "john.stultz@...aro.org" <john.stultz@...aro.org>, "tglx@...utronix.de" <tglx@...utronix.de>, "pbonzini@...hat.com" <pbonzini@...hat.com>, "sean.j.christopherson@...el.com" <sean.j.christopherson@...el.com>, "maz@...nel.org" <maz@...nel.org>, "richardcochran@...il.com" <richardcochran@...il.com>, Mark Rutland <Mark.Rutland@....com>, "will@...nel.org" <will@...nel.org>, Suzuki Poulose <Suzuki.Poulose@....com>, Steven Price <Steven.Price@....com> CC: "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>, "linux-arm-kernel@...ts.infradead.org" <linux-arm-kernel@...ts.infradead.org>, "kvmarm@...ts.cs.columbia.edu" <kvmarm@...ts.cs.columbia.edu>, "kvm@...r.kernel.org" <kvm@...r.kernel.org>, Steve Capper <Steve.Capper@....com>, Kaly Xin <Kaly.Xin@....com>, Justin He <Justin.He@....com>, nd <nd@....com> Subject: RE: [RFC PATCH v9 0/8] Enable ptp_kvm for arm64 Ping ... Any comments to this patch set? > -----Original Message----- > From: Jianyong Wu <jianyong.wu@....com> > Sent: Tuesday, December 10, 2019 11:40 AM > To: netdev@...r.kernel.org; yangbo.lu@....com; john.stultz@...aro.org; > tglx@...utronix.de; pbonzini@...hat.com; sean.j.christopherson@...el.com; > maz@...nel.org; richardcochran@...il.com; Mark Rutland > <Mark.Rutland@....com>; will@...nel.org; Suzuki Poulose > <Suzuki.Poulose@....com>; Steven Price <Steven.Price@....com> > Cc: linux-kernel@...r.kernel.org; linux-arm-kernel@...ts.infradead.org; > kvmarm@...ts.cs.columbia.edu; kvm@...r.kernel.org; Steve Capper > <Steve.Capper@....com>; Kaly Xin (Arm Technology China) > <Kaly.Xin@....com>; Justin He (Arm Technology China) > <Justin.He@....com>; Jianyong Wu (Arm Technology China) > <Jianyong.Wu@....com>; nd <nd@....com> > Subject: [RFC PATCH v9 0/8] Enable ptp_kvm for arm64 > > kvm ptp targets to provide high precision time sync between guest and host > in virtualization environment. Here, we enable kvm ptp for arm64. > This patch set base on [1][2][3] > > change log: > > from v8 to v9: > (1) move ptp_kvm.h to driver/ptp/ > (2) replace license declaration of ptp_kvm.h the same with other > header files in the same directory. > > from v7 to v8: > (1) separate adding clocksource id for arm_arch_counter as a single patch. > (2) update commit message for patch 4/8. > (3) refine patch 7/8 and patch 8/8 to make them more independent. > > from v6 to v7: > (1) include the omitted clocksource_id.h in last version. > (2) reorder the header file in patch. > (3) refine some words in commit message to make it more impersonal. > > from v5 to v6: > (1) apply Mark's patch[4] to get SMCCC conduit. > (2) add mechanism to recognize current clocksource by add > clocksouce_id value into struct clocksource instead of method in patch-v5. > (3) rename kvm_arch_ptp_get_clock_fn into > kvm_arch_ptp_get_crosststamp. > > from v4 to v5: > (1) remove hvc delay compensasion as it should leave to userspace. > (2) check current clocksource in hvc call service. > (3) expose current clocksource by adding it to system_time_snapshot. > (4) add helper to check if clocksource is arm_arch_counter. > (5) rename kvm_ptp.c to ptp_kvm_common.c > > from v3 to v4: > (1) fix clocksource of ptp_kvm to arch_sys_counter. > (2) move kvm_arch_ptp_get_clock_fn into arm_arch_timer.c > (3) subtract cntvoff before return cycles from host. > (4) use ktime_get_snapshot instead of getnstimeofday and > get_current_counterval to return time and counter value. > (5) split ktime and counter into two 32-bit block respectively to avoid > Y2038-safe issue. > (6) set time compensation to device time as half of the delay of hvc call. > (7) add ARM_ARCH_TIMER as dependency of ptp_kvm for arm64. > > from v2 to v3: > (1) fix some issues in commit log. > (2) add some receivers in send list. > > 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 > [4]https://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git/ > commit/?h=for-next/smccc-conduit- > cleanup&id=6b7fe77c334ae59fed9500140e08f4f896b36871 > > Jianyong Wu (6): > psci: let arm_smccc_1_1_invoke available by modules > ptp: Reorganize ptp_kvm modules to make it arch-independent. > clocksource: Add clocksource id for arm arch counter > psci: Add hvc call service for ptp_kvm. > ptp: arm64: Enable ptp_kvm for arm64 > kvm: arm64: Add capability check extension for ptp_kvm > > Mark Rutland (1): > arm/arm64: smccc/psci: add arm_smccc_1_1_get_conduit() > > Thomas Gleixner (1): > time: Add mechanism to recognize clocksource in time_get_snapshot > > drivers/clocksource/arm_arch_timer.c | 24 ++++++ > drivers/firmware/psci/psci.c | 16 ++++ > drivers/ptp/Kconfig | 2 +- > drivers/ptp/Makefile | 1 + > drivers/ptp/ptp_kvm.h | 11 +++ > drivers/ptp/ptp_kvm_arm64.c | 53 +++++++++++++ > drivers/ptp/{ptp_kvm.c => ptp_kvm_common.c} | 77 +++++------------- > drivers/ptp/ptp_kvm_x86.c | 87 +++++++++++++++++++++ > include/linux/arm-smccc.h | 30 ++++++- > include/linux/clocksource.h | 6 ++ > include/linux/clocksource_ids.h | 13 +++ > include/linux/timekeeping.h | 12 +-- > include/uapi/linux/kvm.h | 1 + > kernel/time/clocksource.c | 3 + > kernel/time/timekeeping.c | 1 + > virt/kvm/arm/arm.c | 1 + > virt/kvm/arm/psci.c | 22 ++++++ > 17 files changed, 294 insertions(+), 66 deletions(-) create mode 100644 > drivers/ptp/ptp_kvm.h create mode 100644 drivers/ptp/ptp_kvm_arm64.c > rename drivers/ptp/{ptp_kvm.c => ptp_kvm_common.c} (63%) create > mode 100644 drivers/ptp/ptp_kvm_x86.c create mode 100644 > include/linux/clocksource_ids.h > > -- > 2.17.1
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