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[Xen-devel] can xc_translate_foreign_address() always work for kernel va
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| Subject: | [Xen-devel] can xc_translate_foreign_address() always work for kernel va under x86_64 PV? |
| From: | weiming <zephyr.zhao@xxxxxxxxx> |
| Date: | Thu, 20 Mar 2008 08:20:16 -0400 |
| Delivery-date: | Thu, 20 Mar 2008 05:20:44 -0700 |
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Hi, In xc_translate_foreign_address(), the page directory address comes from vcpu's cr3. when the domains is running a user application, the cr3 should contain the app's page table. Under x86_64 PV, kernel and user space are both under ring 3 and protection is implemented via page protection, which means app's page table has no kernel space mappings. So my question is: given a kernel's virtual address, can this function always return a valid mfn? Thanks, Weiming _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-devel |
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