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Date: Mon, 17 Feb 2020 02:28:57 +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 v10 0/9] Enable ptp_kvm for arm/arm64 Hi, As this version change a lot, expect more comments. thanks. Thanks Jianyong > -----Original Message----- > From: Jianyong Wu <jianyong.wu@....com> > Sent: Monday, February 10, 2020 4:49 PM > 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 <Kaly.Xin@....com>; Justin He > <Justin.He@....com>; Jianyong Wu <Jianyong.Wu@....com>; nd > <nd@....com> > Subject: [RFC PATCH v10 0/9] Enable ptp_kvm for arm/arm64 > > kvm ptp targets to provide high precision time sync between guest and host > in virtualization environment. Here, we enable kvm ptp for arm64. > > change log: > from v10 to v9 > (1) change code base to v5.5. > (2) enable ptp_kvm both for arm32 and arm64. > (3) let user choose which of virtual counter or physical counter should > return when using crosstimestamp mode of ptp_kvm for arm/arm64. > (4) extend input argument for getcrosstimestamp API. > > 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. > > > Jianyong Wu (8): > psci: export psci conduit get helper. > ptp: Reorganize ptp_kvm modules to make it arch-independent. > clocksource: Add clocksource id for arm arch counter > psci: Add hypercall service for ptp_kvm. > ptp: arm/arm64: Enable ptp_kvm for arm/arm64 > ptp: extend input argument for getcrosstimestamp API > arm/arm64: add mechanism to let user choose which counter to return > arm/arm64: Add kvm capability check extension for ptp_kvm > > Thomas Gleixner (1): > time: Add mechanism to recognize clocksource in time_get_snapshot > > drivers/clocksource/arm_arch_timer.c | 33 ++++++++ > drivers/firmware/psci/psci.c | 1 + > drivers/net/ethernet/intel/e1000e/ptp.c | 3 +- > drivers/ptp/Kconfig | 2 +- > drivers/ptp/Makefile | 5 ++ > drivers/ptp/ptp_chardev.c | 8 +- > drivers/ptp/ptp_kvm.h | 11 +++ > drivers/ptp/ptp_kvm_arm.c | 53 +++++++++++++ > drivers/ptp/{ptp_kvm.c => ptp_kvm_common.c} | 83 ++++++-------------- > drivers/ptp/ptp_kvm_x86.c | 87 +++++++++++++++++++++ > include/linux/arm-smccc.h | 21 +++++ > include/linux/clocksource.h | 6 ++ > include/linux/clocksource_ids.h | 13 +++ > include/linux/ptp_clock_kernel.h | 3 +- > include/linux/timekeeping.h | 12 +-- > include/uapi/linux/kvm.h | 1 + > include/uapi/linux/ptp_clock.h | 4 +- > kernel/time/clocksource.c | 3 + > kernel/time/timekeeping.c | 1 + > virt/kvm/arm/arm.c | 1 + > virt/kvm/arm/hypercalls.c | 44 ++++++++++- > 21 files changed, 323 insertions(+), 72 deletions(-) create mode 100644 > drivers/ptp/ptp_kvm.h create mode 100644 drivers/ptp/ptp_kvm_arm.c > rename drivers/ptp/{ptp_kvm.c => ptp_kvm_common.c} (60%) create mode > 100644 drivers/ptp/ptp_kvm_x86.c create mode 100644 > include/linux/clocksource_ids.h > > -- > 2.17.1
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