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authorJulien Grall <julien.grall@citrix.com>2015-08-07 17:34:36 +0100
committerJulien Grall <julien.grall@citrix.com>2015-09-08 17:10:52 +0100
commit5192b35de47e47a0f736fe30da199f32030680e7 (patch)
tree1b7f799b24287918897fe0c724a857f57346d241 /arch
parent32e09870eedfb501a6cb5729d8c23f44f8a7cbdd (diff)
downloadlinux-5192b35de47e47a0f736fe30da199f32030680e7.tar.bz2
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')
-rw-r--r--arch/arm/include/asm/xen/page.h8
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;
}