hypervisor call trace module

[Anton Blanchard]

Here is an example of using the hcall tracepoints. This kernel
module provides strace like functionality for hypervisor hcalls:

-> 0x64(ff000002, 1, 2, d0000000034d7a71, f, c000000000a6f388, 1, c000000000989008, c000000000a3f480)
  <- 0x64()

Which was an EOI (opcode 0x64) of 0xff000002

There are a number of drivers that carry a lot of hcall related debug
code just in case we have to chase down a bug. I'm hoping hcall tracepoints
could replace it all and allow for much more powerful debugging.

Anton
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obj-m := hcall_trace.o
KDIR := /lib/modules/$(shell uname -r)/build
PWD := $(shell pwd)
default:
	$(MAKE) -C $(KDIR) SUBDIRS=$(PWD) modules

clean:
	rm -rf *.mod.c *.ko *.o .*.cmd .tmp_versions Module.markers modules.order Module.symvers
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