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[Xen-devel] Some questions about Xenstore&Xenbus

To: "Keir Fraser" <keir.fraser@xxxxxxxxxxxxx>, "xen-devel@xxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxx>
Subject: [Xen-devel] Some questions about Xenstore&Xenbus
From: "房海峰" <fhf25@xxxxxxx>
Date: Thu, 5 Nov 2009 17:52:44 +0800
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hi, Keir:
Now i am studying the source code of Xenbus (version 3.1).
I found that, in "xenbus_init()", it seems the xenbus need allocate a page for xen_store_mfn in Dom0, while in DomU the value of xen_store_mfn can be obtained from "xen_store_info". So, i guess that every domain has a machine page for xenstore-ring-buffer, that is xen_store_mfn. But, i am puzzled as follows:
  • if xenbus is the client, is xenstored in Dom0 the server, and is xen_store_mfn the communication channel between them?
  • where can i find the allocation for xen_store_mfn?
  • is the xen_store_mfn different for per domain?
  • can i switch off the communication between xenbus and xenstored after i successfully logined into the DomainU?
thanks a lot!
Haifeng Fang
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