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authorJulien Grall <julien.grall@citrix.com>2015-08-07 18:34:36 +0200
committerJulien Grall <julien.grall@citrix.com>2015-09-08 18:10:52 +0200
commit5192b35de47e47a0f736fe30da199f32030680e7 (patch)
tree1b7f799b24287918897fe0c724a857f57346d241 /drivers/cpuidle/sysfs.c
parentxen: Make clear that swiotlb and biomerge are dealing with DMA address (diff)
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arm/xen: implement correctly pfn_to_mfn
After the commit introducing convertion between DMA and guest addresses, all the callers of pfn_to_mfn are expecting to get a GFN (Guest Frame Number). On ARM, all the guests are auto-translated so the GFN is equal to the Linux PFN (Pseudo-physical Frame Number). The current implementation may return an MFN if the caller is passing a PFN associated to a mapped foreign grant. In pratice, I haven't seen the problem on running guest but we should fix it for the sake of correctness. Correct the implementation by always returning the pfn passed in parameter. A follow-up patch will take care to rename pfn_to_mfn to a suitable name. Signed-off-by: Julien Grall <julien.grall@citrix.com> Reviewed-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com> Signed-off-by: David Vrabel <david.vrabel@citrix.com>
Diffstat (limited to 'drivers/cpuidle/sysfs.c')
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