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| author | Konrad Rzeszutek Wilk <konrad.wilk@oracle.com> | 2011-01-14 17:55:44 -0500 |
|---|---|---|
| committer | Konrad Rzeszutek Wilk <konrad.wilk@oracle.com> | 2011-03-14 11:17:13 -0400 |
| commit | 146c4e511717e581065800938537b276173d8548 (patch) | |
| tree | 7894b82558b3c5c3fd6e939a73bd99bc3d16468b /arch/x86/include | |
| parent | fc25151d9ac7d809239fe68de0a1490b504bb94a (diff) | |
| download | linux-146c4e511717e581065800938537b276173d8548.tar.gz linux-146c4e511717e581065800938537b276173d8548.tar.bz2 linux-146c4e511717e581065800938537b276173d8548.zip | |
xen/m2p: No need to catch exceptions when we know that there is no RAM
.. beyound what we think is the end of memory. However there might
be more System RAM - but assigned to a guest. Hence jump to the
M2P override check and consult.
[v1: Added Review-by tag]
Reviewed-by: Ian Campbell <ian.campbell@citrix.com>
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Diffstat (limited to 'arch/x86/include')
| -rw-r--r-- | arch/x86/include/asm/xen/page.h | 6 |
1 files changed, 5 insertions, 1 deletions
diff --git a/arch/x86/include/asm/xen/page.h b/arch/x86/include/asm/xen/page.h index 78ebbeb88d9c..195707060493 100644 --- a/arch/x86/include/asm/xen/page.h +++ b/arch/x86/include/asm/xen/page.h @@ -85,6 +85,10 @@ static inline unsigned long mfn_to_pfn(unsigned long mfn) if (xen_feature(XENFEAT_auto_translated_physmap)) return mfn; + if (unlikely((mfn >> machine_to_phys_order) != 0)) { + pfn = ~0; + goto try_override; + } pfn = 0; /* * The array access can fail (e.g., device space beyond end of RAM). @@ -92,7 +96,7 @@ static inline unsigned long mfn_to_pfn(unsigned long mfn) * but we must handle the fault without crashing! */ __get_user(pfn, &machine_to_phys_mapping[mfn]); - +try_override: /* * If this appears to be a foreign mfn (because the pfn * doesn't map back to the mfn), then check the local override |