[RFC PATCH 0/6] ARM64: KVM: PMU infrastructure support
christoffer.dall at linaro.org
Fri Nov 7 12:23:46 PST 2014
What are your plans in terms of follow-up on this one?
Should we review these patches and reply to anup _at_ brainfaul.org or
are you looking for someone else to pick them up?
On Tue, Aug 05, 2014 at 02:54:09PM +0530, Anup Patel wrote:
> This patchset enables PMU virtualization in KVM ARM64. The
> Guest can now directly use PMU available on the host HW.
> The virtual PMU IRQ injection for Guest VCPUs is managed by
> small piece of code shared between KVM ARM and KVM ARM64. The
> virtual PMU IRQ number will be based on Guest machine model and
> user space will provide it using set device address vm ioctl.
> The second last patch of this series implements full context
> switch of PMU registers which will context switch all PMU
> registers on every KVM world-switch.
> The last patch implements a lazy context switch of PMU registers
> which is very similar to lazy debug context switch.
> (Refer, http://lists.infradead.org/pipermail/linux-arm-kernel/2014-July/271040.html)
> Also, we reserve last PMU event counter for EL2 mode which
> will not be accessible from Host and Guest EL1 mode. This
> reserved EL2 mode PMU event counter can be used for profiling
> KVM world-switch and other EL2 mode functions.
> All testing have been done using KVMTOOL on X-Gene Mustang and
> Foundation v8 Model for both Aarch32 and Aarch64 guest.
> Anup Patel (6):
> ARM64: Move PMU register related defines to asm/pmu.h
> ARM64: perf: Re-enable overflow interrupt from interrupt handler
> ARM: perf: Re-enable overflow interrupt from interrupt handler
> ARM/ARM64: KVM: Add common code PMU IRQ routing
> ARM64: KVM: Implement full context switch of PMU registers
> ARM64: KVM: Upgrade to lazy context switch of PMU registers
> arch/arm/include/asm/kvm_host.h | 9 +
> arch/arm/include/uapi/asm/kvm.h | 1 +
> arch/arm/kernel/perf_event_v7.c | 8 +
> arch/arm/kvm/arm.c | 6 +
> arch/arm/kvm/reset.c | 4 +
> arch/arm64/include/asm/kvm_asm.h | 39 +++-
> arch/arm64/include/asm/kvm_host.h | 12 ++
> arch/arm64/include/asm/pmu.h | 44 +++++
> arch/arm64/include/uapi/asm/kvm.h | 1 +
> arch/arm64/kernel/asm-offsets.c | 2 +
> arch/arm64/kernel/perf_event.c | 40 +---
> arch/arm64/kvm/Kconfig | 7 +
> arch/arm64/kvm/Makefile | 1 +
> arch/arm64/kvm/hyp-init.S | 15 ++
> arch/arm64/kvm/hyp.S | 209 +++++++++++++++++++-
> arch/arm64/kvm/reset.c | 4 +
> arch/arm64/kvm/sys_regs.c | 385 +++++++++++++++++++++++++++++++++----
> include/kvm/arm_pmu.h | 52 +++++
> virt/kvm/arm/pmu.c | 105 ++++++++++
> 19 files changed, 870 insertions(+), 74 deletions(-)
> create mode 100644 include/kvm/arm_pmu.h
> create mode 100644 virt/kvm/arm/pmu.c
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