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[Xen-devel] Re: [PATCH] x86: define arch_vm_get_page_prot to set _PAGE_I
| To: | Jeremy Fitzhardinge <jeremy@xxxxxxxx> |
|---|---|
| Subject: | [Xen-devel] Re: [PATCH] x86: define arch_vm_get_page_prot to set _PAGE_IOMAP on VM_IO vmas |
| From: | "H. Peter Anvin" <hpa@xxxxxxxxx> |
| Date: | Thu, 21 Oct 2010 15:47:52 -0700 |
| Cc: | "Xen-devel@xxxxxxxxxxxxxxxxxxx" <Xen-devel@xxxxxxxxxxxxxxxxxxx>, the arch/x86 maintainers <x86@xxxxxxxxxx>, Linux Kernel Mailing List <linux-kernel@xxxxxxxxxxxxxxx>, Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx> |
| Delivery-date: | Thu, 21 Oct 2010 15:48:54 -0700 |
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On 10/21/2010 03:40 PM, Jeremy Fitzhardinge wrote:
>
> Set _PAGE_IOMAP in ptes mapping a VM_IO vma. This says that the mapping
> is of a real piece of physical hardware, and not just system memory.
>
> Xen, in particular, uses to this to inhibit the normal pfn->mfn conversion
> that would normally happen - in other words, treat the address directly
> as a machine physical address without converting it from pseudo-physical.
>
> [ Impact: make VM_IO mappings map the right thing under Xen ]
>
> Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@xxxxxxxxxx>
>
Am I the only one who thinks this seems extremely odd that the guest is
trusted to make this distinction?
-hpa
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