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Re: [Xen-devel] foreign mapping destructor
| To: | "King, Steven R" <steven.r.king@xxxxxxxxx> |
|---|---|
| Subject: | Re: [Xen-devel] foreign mapping destructor |
| From: | Keir Fraser <Keir.Fraser@xxxxxxxxxxxx> |
| Date: | Fri, 2 Dec 2005 10:19:23 +0000 |
| Cc: | xen-devel@xxxxxxxxxxxxxxxxxxx |
| Delivery-date: | Fri, 02 Dec 2005 10:13:38 +0000 |
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| In-reply-to: | <44BDAFB888F59F408FAE3CC35AB47041027B056D@orsmsx409> |
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| References: | <44BDAFB888F59F408FAE3CC35AB47041027B056D@orsmsx409> |
| Sender: | xen-devel-bounces@xxxxxxxxxxxxxxxxxxx |
On 2 Dec 2005, at 00:54, King, Steven R wrote: The SetPageForeign() macro takes a pointer to a destructor function. Can someone please explain the responsibilities of this destructor? Thanks for your time, The 'Foreign' in this context is supposed to refer to a foreign heap. That is, the page was not originally allocated from page_alloc.c. So the destructor is entirely responsible for cleaning up that page of memory (e.g., in netback.c it unmaps a domU page and sends a packet-transmitted response to the domU netfront driver). After calling the destructore, page_alloc.c will not touch that page any more (it will immediately bail). -- Keir _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-devel |
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