[RFC PATCH 0/6] ARM64: KVM: PMU infrastructure support

[Christoffer Dall]

Yes, sounds good.  I will review RFC v2 then.

-Christoffer

On Sat, Nov 8, 2014 at 10:36 AM, Anup Patel <anup at brainfault.org> wrote:
> Hi Christoffer,
>
> On Sat, Nov 8, 2014 at 1:55 AM, Christoffer Dall
> <christoffer.dall at linaro.org> wrote:
>> Hi Anup,
>>
>> [This time to the new email]
>>
>> What are your plans in terms of follow-up on this one?
>
> Actually, I am already working on RFC v2. I will send-out
> RFC v2 sometime next time.
>
> This RFC v2 will be RFC v1 based upon Marc's IRQ
> forwarding patchset.
>
> I will try to address PMU context switching for KVM ARM
> in RFC v3. Does this sound OK?
>
> Regards,
> Anup
>
>>
>> Should we review these patches and reply to anup _at_ brainfaul.org or
>> are you looking for someone else to pick them up?
>>
>> Thanks,
>> -Christoffer
>>
>> 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
>>>
>>> --
>>> 1.7.9.5
>>>