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| author | Julien Grall <julien.grall@citrix.com> | 2015-08-07 18:34:36 +0200 |
|---|---|---|
| committer | Julien Grall <julien.grall@citrix.com> | 2015-09-08 18:10:52 +0200 |
| commit | 5192b35de47e47a0f736fe30da199f32030680e7 (patch) | |
| tree | 1b7f799b24287918897fe0c724a857f57346d241 /arch/arm | |
| parent | xen: Make clear that swiotlb and biomerge are dealing with DMA address (diff) | |
| download | linux-5192b35de47e47a0f736fe30da199f32030680e7.tar.xz linux-5192b35de47e47a0f736fe30da199f32030680e7.zip | |
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 'arch/arm')
| -rw-r--r-- | arch/arm/include/asm/xen/page.h | 8 |
1 files changed, 0 insertions, 8 deletions
diff --git a/arch/arm/include/asm/xen/page.h b/arch/arm/include/asm/xen/page.h index 5f76a9e7ef1b..911d62b4df26 100644 --- a/arch/arm/include/asm/xen/page.h +++ b/arch/arm/include/asm/xen/page.h @@ -36,14 +36,6 @@ extern struct rb_root phys_to_mach; static inline unsigned long pfn_to_mfn(unsigned long pfn) { - unsigned long mfn; - - if (phys_to_mach.rb_node != NULL) { - mfn = __pfn_to_mfn(pfn); - if (mfn != INVALID_P2M_ENTRY) - return mfn; - } - return pfn; } |