Messages in this thread | | | Subject | Re: [PATCH v15 00/10] arm64: Add kernel probes (kprobes) support | From | David Long <> | Date | Tue, 19 Jul 2016 10:01:37 -0400 |
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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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