diff options
Diffstat (limited to 'arch/x86/include/asm/xen/page.h')
| -rw-r--r-- | arch/x86/include/asm/xen/page.h | 20 |
1 files changed, 16 insertions, 4 deletions
diff --git a/arch/x86/include/asm/xen/page.h b/arch/x86/include/asm/xen/page.h index 57aba6ba6f92..b54a3d20d6b2 100644 --- a/arch/x86/include/asm/xen/page.h +++ b/arch/x86/include/asm/xen/page.h @@ -65,13 +65,25 @@ extern unsigned long m2p_find_override_pfn(unsigned long mfn, unsigned long pfn) * bits (identity or foreign) are set. * - __pfn_to_mfn() returns the found entry of the p2m table. A possibly set * identity or foreign indicator will be still set. __pfn_to_mfn() is - * encapsulating get_phys_to_machine(). - * - get_phys_to_machine() is to be called by __pfn_to_mfn() only to allow - * for future optimizations. + * encapsulating get_phys_to_machine() which is called in special cases only. + * - get_phys_to_machine() is to be called by __pfn_to_mfn() only in special + * cases needing an extended handling. */ static inline unsigned long __pfn_to_mfn(unsigned long pfn) { - return get_phys_to_machine(pfn); + unsigned long mfn; + + if (pfn < xen_p2m_size) + mfn = xen_p2m_addr[pfn]; + else if (unlikely(pfn < xen_max_p2m_pfn)) + return get_phys_to_machine(pfn); + else + return IDENTITY_FRAME(pfn); + + if (unlikely(mfn == INVALID_P2M_ENTRY)) + return get_phys_to_machine(pfn); + + return mfn; } static inline unsigned long pfn_to_mfn(unsigned long pfn) |