Memory Tracking API

Hi ,

Is it possible to keep a count of reads / writes taking place in a vm using qemu ( using kvm as hypervisor ) ? Is there a api ( or any patch ) for it ?

Thanks ,
Jaspal

Memory reads and writes is surely going to generate a huge amount of output!

There are various DEBUG_* symbols at the top of exec.c and ioport.c. I've only used a few of these:

DEBUG_UNASSIGNED - prints a message when an unmapped page is
referenced (TCG only, presumably?)

DEBUG_IOPORT - prints a message when any I/O port is referenced

DEBUG_UNUSED_IOPORT - prints a message when a non-emulated I/O port
is referenced

There are several more if you look at the code.

Rich.

Richard Jones, Virtualization Group, Red Hat http://people.redhat.com/~rjones
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When are these functions called : kvm_read_guest_page , kvm_read_guest_atomic , kvm_write_guest_page present in kvm_main.c ? When qemu wants to read/write to a page ? If qemu has to read/write on the vm's memory ( RAM ) , does the process always involve kvm ?

Thanks ,
Jaspal