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Re: [Xen-devel][VTD] 1:1 mapping for dom0 exhausts xenheap on x86/32 wit
| To: | "Han, Weidong" <weidong.han@xxxxxxxxx>, <xen-devel@xxxxxxxxxxxxxxxxxxx> |
|---|---|
| Subject: | Re: [Xen-devel][VTD] 1:1 mapping for dom0 exhausts xenheap on x86/32 with 4G memory |
| From: | Keir Fraser <Keir.Fraser@xxxxxxxxxxxx> |
| Date: | Fri, 28 Sep 2007 08:59:40 +0100 |
| Cc: | "Kay, Allen M" <allen.m.kay@xxxxxxxxx> |
| Delivery-date: | Fri, 28 Sep 2007 00:55:27 -0700 |
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| Thread-topic: | [Xen-devel][VTD] 1:1 mapping for dom0 exhausts xenheap on x86/32 with 4G memory |
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On 28/9/07 08:51, "Han, Weidong" <weidong.han@xxxxxxxxx> wrote: >>> I already had a try to use alloc_domheap_page() instead of >>> alloc_xenheap_page(). It works on x86/64. But it doesn't work on >>> x86/32. >> >> Use map_domain_page(), or live with only x86/64 support. You can't >> burn x86/32's limited xenheap space on iommu page tables. >> >> -- Keir > > The 1:1 mapping page table is setup for both dom0 and PV domains. Is it > no problem to use alloc_domheap_page() and map_domain_page()? It's fine. Pass NULL as the domain pointer to alloc_domheap_page() and you get anonymous pages from the global domain heap. The 'domain' in the name of alloc_domheap_page() and map_domain_page() functions is a bit misleading! -- Keir _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-devel |
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