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| author |   Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com> | 2010-08-31 14:06:22 -0700 |
|---|---|---|
| committer | Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com> | 2010-10-22 12:57:26 -0700 |
| commit | cfd8951e082a589637f9de3c33efd3218fdb3c03 (patch) | |
| tree | e4b55dc7c0aa6dce4e022d1162abfd2633758720 /arch/x86/include/asm/xen | |
| parent | xen: defer building p2m mfn structures until kernel is mapped (diff) | |
| download | linux-dev-cfd8951e082a589637f9de3c33efd3218fdb3c03.tar.xz linux-dev-cfd8951e082a589637f9de3c33efd3218fdb3c03.zip | |
xen: don't map missing memory
When setting up a pte for a missing pfn (no matching mfn), just create
an empty pte rather than a junk mapping.
Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
Diffstat (limited to 'arch/x86/include/asm/xen')
| -rw-r--r-- | arch/x86/include/asm/xen/page.h | 9 |
1 files changed, 8 insertions, 1 deletions
diff --git a/arch/x86/include/asm/xen/page.h b/arch/x86/include/asm/xen/page.h index e40ca6e67bb5..875f5a08a6c7 100644 --- a/arch/x86/include/asm/xen/page.h +++ b/arch/x86/include/asm/xen/page.h @@ -41,10 +41,17 @@ extern bool set_phys_to_machine(unsigned long pfn, unsigned long mfn); static inline unsigned long pfn_to_mfn(unsigned long pfn) { + unsigned long mfn; + if (xen_feature(XENFEAT_auto_translated_physmap)) return pfn; - return get_phys_to_machine(pfn) & ~FOREIGN_FRAME_BIT; + mfn = get_phys_to_machine(pfn); + + if (mfn != INVALID_P2M_ENTRY) + mfn &= ~FOREIGN_FRAME_BIT; + + return mfn; } static inline int phys_to_machine_mapping_valid(unsigned long pfn) |