From: "Ethan" <zhangyqzh@gmail.com>
To: xen-devel@lists.xenproject.org
Subject: Help！About Xen source code；About do_memory_op.
Date: Fri, 1 Aug 2014 10:42:48 +0800 [thread overview]
Message-ID: <000401cfad32$4bcd27a0$e36776e0$@gmail.com> (raw)
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In Xen source about Hypercall, there is a function called
do_memory_op(unsigned long cmd, XEN_GUEST_HANDLE(void) arg). What does
'XEN_GUEST_HANDLE‘ mean？ I search the source code and only find the macro.
I know it is a pointer to a structure containing an operation. But how does
it get its actual parameters?
Also, in 'do_memory_op()' there is a function called
memory_exchange(guest_handle_cast(arg, xen_memory_exchange_t)). What does
'guest_handle_cast' mean?
In a word, how does 'memory_exchange' get the actual memory address? Or how
does struct 'xen_memory_exchange_t' get assigned?
Thank you !!!
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