[Xen-devel] 2 questions about hypercall

[anita <anitawang1989@xxxxxxxxx>]

Hi, I've been reading the xen source code recently, and I have got 2
questions about hypercall.

1. I find 2 header files named hypercall.h in the directory 
linux/arch/x86/include. One is in the sub-directory
/mach-xen/asm/hypercall.h, and the other is /asm/xen/hypercall.h.  After
comparing these two, I find their contents are similar but different, and I
can't figure out what's the difference between them, what their purposes are
, and when kernel want to trap into xen hypervisor, which one will kernel
chooseï

2. I find that the xen tools also used hypercall. My question is how does
tools used it ? is the process the same as the kernel, or xen tools use
hypercall in a different way?

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