[PULL 12/36] kvm: powerpc: define a linux pte lookup function

Alexander Graf
2014-01-29T16:13:22Z

From: Bharat Bhushan <r65777@freescale.com>

We need to search linux "pte" to get "pte" attributes for setting TLB in KVM.
This patch defines a lookup_linux_ptep() function which returns pte pointer.

Signed-off-by: Bharat Bhushan <bharat.bhushan@freescale.com>
Reviewed-by: Scott Wood <scottwood@freescale.com>
Signed-off-by: Alexander Graf <agraf@suse.de>
---
arch/powerpc/include/asm/pgtable.h | 21 +++++++++++++++++++++
1 file changed, 21 insertions(+)

diff --git a/arch/powerpc/include/asm/pgtable.h b/arch/powerpc/include/asm/pgtable.h
index 7d6eacf..b60ceb8 100644
--- a/arch/powerpc/include/asm/pgtable.h
+++ b/arch/powerpc/include/asm/pgtable.h
@@ -223,6 +223,27 @@ 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_ptep(pgd_t *pgdir, unsigned long hva,
+ unsigned long *pte_sizep)
+{
+ pte_t *ptep;
+ unsigned long ps = *pte_sizep;
+ unsigned int shift;
+
+ ptep = find_linux_pte_or_hugepte(pgdir, hva, &shift);
+ if (!ptep)
+ return NULL;
+ if (shift)
+ *pte_sizep = 1ul << shift;
+ else
+ *pte_sizep = PAGE_SIZE;
+
+ if (ps > *pte_sizep)
+ return NULL;
+
+ return ptep;
+}
#endif /* __ASSEMBLY__ */

#endif /* __KERNEL__ */
--
1.8.1.4