From mboxrd@z Thu Jan 1 00:00:00 1970 From: Alexander Graf Subject: [PULL 12/36] kvm: powerpc: define a linux pte lookup function Date: Wed, 29 Jan 2014 17:12:51 +0100 Message-ID: <1391011995-4891-13-git-send-email-agraf@suse.de> References: <1391011995-4891-1-git-send-email-agraf@suse.de> Cc: kvm-ppc@vger.kernel.org, gleb@redhat.com, Paolo Bonzini , Bharat Bhushan , Bharat Bhushan To: kvm@vger.kernel.org Return-path: Received: from cantor2.suse.de ([195.135.220.15]:54465 "EHLO mx2.suse.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752721AbaA2QNW (ORCPT ); Wed, 29 Jan 2014 11:13:22 -0500 In-Reply-To: <1391011995-4891-1-git-send-email-agraf@suse.de> Sender: kvm-owner@vger.kernel.org List-ID: From: Bharat Bhushan 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 Reviewed-by: Scott Wood Signed-off-by: Alexander Graf --- 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