Hello all, I intend to run a kernel module inside my guest VM. The kernel module sets kprobes on a couple of functions in the linux kernel. After registering the kprobes successfully, I can see that the kprobes are being hit repeatedly. I would like to cause a VMEXIT when these kprobes are hit. I know that kprobes use a breakpoint instruction (INT 3) to successfully execute the pre and post handlers. This would mean that the execution of the instruction INT 3 should technically cause a VMEXIT. However, I do not get any software exception type VMEXITs when these kprobes are hit. I have used the commands "perf kvm stat record" and "perf kvm stat report --event=vmexit" to try and observe the VMEXIT reasons and I do not see any VMEXIT of type "EXCEPTION_NMI" being returned in the period that the kprobe was being hit. My host uses a modified Linux kernel 5.8.0 while my guest runs a 4.4.0 Linux kernel. Both the guest and the host use the x86_64 architecture. I am using QEMU version 5.0.1. What changes are needed in the Linux kernel to make sure that I get an exception in the form of a VMEXIT whenever the kprobes are hit? Thank you very much. Best Regards, Arnabjyoti Kalita
