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    SubjectRe: [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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