lkml.org 
[lkml]   [2010]   [Oct]   [21]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
    /
    Date
    From
    SubjectRe: [PATCH] x86: define arch_vm_get_page_prot to set _PAGE_IOMAP on VM_IO vmas
    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@citrix.com>
    >

    Am I the only one who thinks this seems extremely odd that the guest is
    trusted to make this distinction?

    -hpa


    \
     
     \ /
      Last update: 2010-10-22 00:51    [W:2.446 / U:0.028 seconds]
    ©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site