(crossposting from KVM maillist) Hi
Is it possible to get stack backtrace into KVM VM from the host side? So if I run './stack -p PID' (stack from elfutilfs https://sourceware.org/elfutils/), I get backtrace of some process. I would like to do the same for VM. I can assume VM will run only a kernel (a unikernel, like OSv or IncludeOS), so most/all debug symbols will be there in a single file, and at least IncludeOS doesnt load any code beside its own kernel.
I did notice KVM_GET_REGS and KVM_SET_MEMORY_REGION, and at least for trivial examples (like https://github.com/dpw/kvm-hello-world) this provides enough information to track which code was loaded into VM, observe current stack content and registers. I can only guess much more work is required to get similar result with qemu-kvm. Hence I'm asking if this is already implemented.
Thank you, Justin
