We need to search linux "pte" to get "pte" attributes for setting TLB in KVM. This patch defines a linux_pte_lookup() function for same.
Signed-off-by: Bharat Bhushan <[email protected]> --- arch/powerpc/include/asm/pgtable.h | 35 +++++++++++++++++++++++++++++++++++ 1 files changed, 35 insertions(+), 0 deletions(-) diff --git a/arch/powerpc/include/asm/pgtable.h b/arch/powerpc/include/asm/pgtable.h index 7d6eacf..fd26c04 100644 --- a/arch/powerpc/include/asm/pgtable.h +++ b/arch/powerpc/include/asm/pgtable.h @@ -223,6 +223,41 @@ extern int gup_hugepte(pte_t *ptep, unsigned long sz, unsigned long addr, #endif pte_t *find_linux_pte_or_hugepte(pgd_t *pgdir, unsigned long ea, unsigned *shift); + +static inline pte_t lookup_linux_pte(pgd_t *pgdir, unsigned long hva, + unsigned long *pte_sizep) +{ + pte_t *ptep; + pte_t pte; + unsigned long ps = *pte_sizep; + unsigned int shift; + + ptep = find_linux_pte_or_hugepte(pgdir, hva, &shift); + if (!ptep) + return __pte(0); + if (shift) + *pte_sizep = 1ul << shift; + else + *pte_sizep = PAGE_SIZE; + + if (ps > *pte_sizep) + return __pte(0); + + /* wait until _PAGE_BUSY is clear */ + while (1) { + pte = pte_val(*ptep); + if (unlikely(pte & _PAGE_BUSY)) { + cpu_relax(); + continue; + } + } + + /* If pte is not present return None */ + if (unlikely(!(pte & _PAGE_PRESENT))) + return __pte(0); + + return pte; +} #endif /* __ASSEMBLY__ */ #endif /* __KERNEL__ */ -- 1.7.0.4 -- To unsubscribe from this list: send the line "unsubscribe kvm-ppc" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
