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Re: [PATCH v15 00/10] arm64: Add kernel probes (kprobes) support

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On 07/19/2016 09:57 AM, Catalin Marinas wrote:
> On Thu, Jul 14, 2016 at 05:22:08PM +0100, Catalin Marinas wrote:
>> On Fri, Jul 08, 2016 at 12:35:44PM -0400, David Long wrote:
>>> David A. Long (3):
>>>    arm64: Add HAVE_REGS_AND_STACK_ACCESS_API feature
>>>    arm64: Add more test functions to insn.c
>>>    arm64: add conditional instruction simulation support
>>>
>>> Pratyush Anand (2):
>>>    arm64: Blacklist non-kprobe-able symbol
>>>    arm64: Treat all entry code as non-kprobe-able
>>>
>>> Sandeepa Prabhu (4):
>>>    arm64: Kprobes with single stepping support
>>>    arm64: kprobes instruction simulation support
>>>    arm64: Add kernel return probes support (kretprobes)
>>>    kprobes: Add arm64 case in kprobe example module
>>>
>>> William Cohen (1):
>>>    arm64: Add trampoline code for kretprobes
>>
>> I applied these patches on top of the arm64 for-next/core branch an
>> tried to run the resulting kernel in a guest (on a Juno platform using
>> both kvmtool and qemu) with KPROBES_SANITY_TEST enabled. Unfortunately,
>> the kernel fails to boot with lots of "Unexpected kernel single-step
>> exception at EL1".
>
> FYI, we managed to track down the issue to two bugs in the arm64 kernel
> boot part, occasionally leaving the PSTATE.D bit set for kernel threads.
> While not KVM specific, the pre-conditions were more likely when running
> as a guest (receiving interrupts early on during boot, possibly because
> of a slow-down in the booting process due to stage 2 page faulting
> mechanism).
>
> Will is going to post the fixes soon.
>

Excellent news.

Thanks,
-dl

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Re: [PATCH v15 00/10] arm64: Add kernel probes (kprobes) support Catalin Marinas <catalin.marinas@arm.com> - 2016-07-14 18:30 +0200
  Re: [PATCH v15 00/10] arm64: Add kernel probes (kprobes) support William Cohen <wcohen@redhat.com> - 2016-07-14 19:10 +0200
    Re: [PATCH v15 00/10] arm64: Add kernel probes (kprobes) support Catalin Marinas <catalin.marinas@arm.com> - 2016-07-15 10:00 +0200
      Re: [PATCH v15 00/10] arm64: Add kernel probes (kprobes) support Marc Zyngier <marc.zyngier@arm.com> - 2016-07-15 10:10 +0200
        Re: [PATCH v15 00/10] arm64: Add kernel probes (kprobes) support Alex Bennée <alex.bennee@linaro.org> - 2016-07-15 11:00 +0200
          Re: [PATCH v15 00/10] arm64: Add kernel probes (kprobes) support Marc Zyngier <marc.zyngier@arm.com> - 2016-07-15 11:10 +0200
          Re: [PATCH v15 00/10] arm64: Add kernel probes (kprobes) support Marc Zyngier <marc.zyngier@arm.com> - 2016-07-15 12:00 +0200
  Re: [PATCH v15 00/10] arm64: Add kernel probes (kprobes) support David Long <dave.long@linaro.org> - 2016-07-14 20:00 +0200
  Re: [PATCH v15 00/10] arm64: Add kernel probes (kprobes) support Catalin Marinas <catalin.marinas@arm.com> - 2016-07-19 16:00 +0200
    Re: [PATCH v15 00/10] arm64: Add kernel probes (kprobes) support David Long <dave.long@linaro.org> - 2016-07-19 16:10 +0200

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