Messages in this thread | | | Date | Mon, 20 Mar 2023 17:44:31 +0100 | From | Peter Zijlstra <> | Subject | Re: [PATCH v5 22/34] x86/fred: FRED initialization code |
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On Fri, Mar 17, 2023 at 02:32:28PM -0700, H. Peter Anvin wrote: > The purpose of separate stacks for NMI, #DB and #MC *in the kernel* > (remember that user space faults are always taken on stack level 0) is > to avoid overflowing the kernel stack. #DB in the kernel would imply > the use of a kernel debugger.
Perf (and through it bpf) also has access to #DB. They can set breakpoints on kernel instructions/memory just fine provided permission etc.
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