[Xen-devel] Adding new custom devices to Xen via QEMU

[Jason Dickens <jdickens@xxxxxxxxxxxxxx>]

Hello,

My name is Jason Dickens and I'm a Research Scientist here at 
GrammaTech. Some of our research involves securing hypervisors and we 
have needed to add to and/or modify Xen. I have been successful in 
modifying the source for various purposes, but my question now is about 
devices. We have a custom device model implemented in QEMU which works 
great with QEMU (on Intel) standalone and with KVM, however, we now want 
access to it in Xen using the same modified QEMU build.
The only problem I seem to be having is getting Xen to send the MMIO 
R/W's to QEMU. The device is being realized, but guest access to the 
physical address range I expect to reference the device seem to go no 
place. I see in the source calls such as "register_io_handler" that 
other devices use to effect the EPT mapping. Is this what I need?
My main question is whether or not it is truly necessary to change Xen 
itself in order to introduce new devices in Xen using QEMU, or is there 
just a configuration setting? And what is the simplest way to have a 
range of physical addresses access a custom QEMU device?
Thanks,
Jason


_______________________________________________
Xen-devel mailing list
Xen-devel@xxxxxxxxxxxxx
https://lists.xen.org/xen-devel