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[Xen-devel] can xc_translate_foreign_address() always work for kernel va

from [weiming] [Permanent Link][Original]

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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:	2008年3月20日 08:20:16 -0400
Delivery-date:	2008年3月20日 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

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[Xen-devel] can xc_translate_foreign_address() always work for kernel va