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Message-ID: <6b43c28b-df68-112d-f8a3-6f952a50f54f@redhat.com>
Date: Thu, 14 Jul 2016 13:09:08 -0400
From: William Cohen <wcohen@...hat.com>
To: Catalin Marinas <catalin.marinas@....com>,
David Long <dave.long@...aro.org>
Cc: Huang Shijie <shijie.huang@....com>,
James Morse <james.morse@....com>,
Marc Zyngier <marc.zyngier@....com>,
Pratyush Anand <panand@...hat.com>,
Sandeepa Prabhu <sandeepa.s.prabhu@...il.com>,
Will Deacon <will.deacon@....com>,
linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
Steve Capper <steve.capper@...aro.org>,
Masami Hiramatsu <mhiramat@...nel.org>,
Li Bin <huawei.libin@...wei.com>,
Jisheng Zhang <jszhang@...vell.com>,
Mark Rutland <mark.rutland@....com>,
Daniel Thompson <daniel.thompson@...aro.org>,
Vladimir Murzin <Vladimir.Murzin@....com>,
Petr Mladek <pmladek@...e.com>,
Ard Biesheuvel <ard.biesheuvel@...aro.org>,
Jens Wiklander <jens.wiklander@...aro.org>,
Robin Murphy <robin.murphy@....com>,
Mark Brown <broonie@...nel.org>,
Suzuki K Poulose <suzuki.poulose@....com>,
Dave P Martin <Dave.Martin@....com>,
Andrey Ryabinin <ryabinin.a.a@...il.com>,
yalin wang <yalin.wang2010@...il.com>,
Yang Shi <yang.shi@...aro.org>,
Zi Shen Lim <zlim.lnx@...il.com>,
John Blackwood <john.blackwood@...r.com>,
Andrew Morton <akpm@...ux-foundation.org>,
Alex Bennée <alex.bennee@...aro.org>,
Adam Buchbinder <adam.buchbinder@...il.com>,
Christoffer Dall <christoffer.dall@...aro.org>
Subject: Re: [PATCH v15 00/10] arm64: Add kernel probes (kprobes) support
On 07/14/2016 12:22 PM, 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".
>
> Did you manage to run Kprobes in a guest before?
>
Hi,
I ran the systemtap testsuite several times on a physical machine running a kernel with the kprobe v15 patches without problem. Shouldn't the guest machine behave in the same manner as a host machine for single stepping and exception handling? If the guest machine is failing, wouldn't that suggest there is a problem with the KVM handling of single stepping for guests?
-Will Cohen
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