Re: bhyve -G <port>
- Reply: John Baldwin : "Re: bhyve -G <port>"
- In reply to: John Baldwin : "Re: bhyve -G <port>"
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Date: Wed, 15 Nov 2023 23:06:06 UTC
> On Nov 15, 2023, at 7:57 AM, John Baldwin <jhb@FreeBSD.org> wrote: > > On 10/9/23 5:21 PM, Bakul Shah wrote: >> Any hints on how to use bhyve's -G <port> option to debug a VM >> kernel? I can connect to it from gdb with "target remote :<port>" >> & bhyve stops the VM initially but beyond that I am not sure. >> Ideally this should work just like an in-circuit-emulator, not >> requiring anything special in the VM or kernel itself. > > step only works on Intel CPUs currently (and is a bit fragile > anyway due to interrupts firing while you try to step, but that > happens for me in QEMU as well). Breakpoints should work fine. > I tend to use 'until' to do stepping (basically stepping via > temporary breakpoints) when debugging the kernel this way. Thanks for your response! I can ^C to stop the VM, examine the stack, set breakpoints, continue etc. but when the breakpoint is hit, kgdb doesn't regain control -- instead I get the usual db> ... prompt on the console. I guess I have to set some sysctl for this? Thanks, Bakul