[Xen-users] capturing cpl changes

["Emre Can Sezer" <ecsezer@xxxxxxxx>]

I have a 64 bit hvm guest and I'd like to capture when the execution
switches to kernel mode in the guest.  I've tried to capture MSR reads and
writes, but I only see writes to SYSENTER_CS/EIP/ESP registers once,
during initialization I suppose, but I don't see any reads from these
registers as I'd expect when sysenter is called.

My goal is to capture when the execution jumps to guest kernel space
either through a system call or any other interrupt/exception.  Is there a
way I can capture the privilege escalation?  I'm mainly looking into
vmx_vmexit_handler, but I'm not even sure if the events I'm looking for
trigger VMEXITs.

Thanks in advance.

John

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