From: Andrew Murray <andrew.murray@arm.com>
To: Christoffer Dall <christoffer.dall@arm.com>,
Marc Zyngier <marc.zyngier@arm.com>,
Catalin Marinas <catalin.marinas@arm.com>,
Will Deacon <will.deacon@arm.com>,
Mark Rutland <mark.rutland@arm.com>
Cc: Julien Thierry <julien.thierry@arm.com>,
kvmarm@lists.cs.columbia.edu,
linux-arm-kernel@lists.infradead.org,
Suzuki K Poulose <suzuki.poulose@arm.com>
Subject: [PATCH v10 0/5] arm64: Support perf event modifiers :G and :H
Date: Mon, 14 Jan 2019 16:11:43 +0000 [thread overview]
Message-ID: <1547482308-29839-1-git-send-email-andrew.murray@arm.com> (raw)
This patchset provides support for perf event modifiers :G and :H which
allows for filtering of PMU events between host and guests when used
with KVM.
As the underlying hardware cannot distinguish between guest and host
context, the performance counters must be stopped and started upon
entry/exit to the guest. This is performed at EL2 in a way that
minimizes overhead and improves accuracy of recording events that only
occur in the requested context.
This has been tested with VHE and non-VHE kernels with a KVM guest.
Changes from v9:
- Rebased to v5.0-rc2
- Ensure get_host_ctxt considers host_ctxt offset
Changes from v8:
- Added additional comments
- Fixed bisect build failure
- Renamed cpu_ctxt variable to cpu_data
Changes from v7:
- Added additional patch to encapsulate kvm_cpu_context in kvm_host_data
Changes from v6:
- Move events_host/events_guest out of kvm_cpu_context
Changes from v5:
- Tweak logic in use of kvm_set_pmu_events
Changes from v4:
- Prevent unnecessary write_sysreg calls by improving
__pmu_switch_to_xxx logic.
Changes from v3:
- Remove confusing _only suffix from bitfields in kvm_cpu_context
- Remove unnecessary condition when clearing event bits in disable
- Simplify API of KVM accessors
- Prevent unnecessary setting of pmcnten when guest/host events are
the same.
Changes from v2:
- Ensured that exclude_kernel works for guest
- Removed unnecessary exclusion of EL2 with exclude_host on !VHE
- Renamed kvm_clr_set_host_pmu_events to reflect args order
- Added additional information to isb patch
Changes from v1:
- Removed unnecessary exclusion of EL1 with exclude_guest on VHE
- Removed unnecessary isb from existing perf_event.c driver
- Folded perf_event.c patches together
- Added additional information to last patch commit message
Andrew Murray (5):
arm64: arm_pmu: remove unnecessary isb instruction
arm64: KVM: encapsulate kvm_cpu_context in kvm_host_data
arm64: KVM: add accessors to track guest/host only counters
arm64: arm_pmu: Add support for exclude_host/exclude_guest attributes
arm64: KVM: Enable support for :G/:H perf event modifiers
arch/arm/include/asm/kvm_host.h | 8 ++++--
arch/arm64/include/asm/kvm_asm.h | 3 +-
arch/arm64/include/asm/kvm_host.h | 42 +++++++++++++++++++++++----
arch/arm64/kernel/asm-offsets.c | 1 +
arch/arm64/kernel/perf_event.c | 54 +++++++++++++++++++++++++++++------
arch/arm64/kvm/hyp/switch.c | 60 +++++++++++++++++++++++++++++++++++++++
virt/kvm/arm/arm.c | 12 ++++----
7 files changed, 159 insertions(+), 21 deletions(-)
--
2.7.4
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next reply other threads:[~2019-01-14 16:12 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-01-14 16:11 Andrew Murray [this message]
2019-01-14 16:11 ` [PATCH v10 1/5] arm64: arm_pmu: remove unnecessary isb instruction Andrew Murray
2019-01-14 16:11 ` [PATCH v10 2/5] arm64: KVM: encapsulate kvm_cpu_context in kvm_host_data Andrew Murray
2019-01-14 16:11 ` [PATCH v10 3/5] arm64: KVM: add accessors to track guest/host only counters Andrew Murray
2019-01-14 16:11 ` [PATCH v10 4/5] arm64: arm_pmu: Add support for exclude_host/exclude_guest attributes Andrew Murray
2019-02-11 11:26 ` Will Deacon
2019-02-18 21:53 ` Christoffer Dall
2019-02-20 16:15 ` Andrew Murray
2019-02-26 12:44 ` Christoffer Dall
2019-03-04 11:14 ` Andrew Murray
2019-03-05 11:45 ` Andrew Murray
2019-03-06 8:42 ` Christoffer Dall
2019-01-14 16:11 ` [PATCH v10 5/5] arm64: KVM: Enable support for :G/:H perf event modifiers Andrew Murray
2019-02-18 22:00 ` Christoffer Dall
2019-03-04 9:40 ` Andrew Murray
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