From patchwork Fri Apr 26 18:29:56 2013 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Alexander Graf X-Patchwork-Id: 239968 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by ozlabs.org (Postfix) with ESMTP id E7C002C011E for ; Sat, 27 Apr 2013 04:34:05 +1000 (EST) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1757306Ab3DZSdc (ORCPT ); Fri, 26 Apr 2013 14:33:32 -0400 Received: from cantor2.suse.de ([195.135.220.15]:39370 "EHLO mx2.suse.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1757231Ab3DZSam (ORCPT ); Fri, 26 Apr 2013 14:30:42 -0400 Received: from relay2.suse.de (unknown [195.135.220.254]) by mx2.suse.de (Postfix) with ESMTP id BA3635E000219; Fri, 26 Apr 2013 20:30:38 +0200 (CEST) From: Alexander Graf To: kvm-ppc@vger.kernel.org Cc: "kvm@vger.kernel.org mailing list" , Marcelo Tosatti , Gleb Natapov , Bharat Bhushan , Bharat Bhushan Subject: [PATCH 01/42] KVM: PPC: cache flush for kernel managed pages Date: Fri, 26 Apr 2013 20:29:56 +0200 Message-Id: <1367001037-10394-23-git-send-email-agraf@suse.de> X-Mailer: git-send-email 1.6.0.2 In-Reply-To: <1367001037-10394-1-git-send-email-agraf@suse.de> References: <1367001037-10394-1-git-send-email-agraf@suse.de> Sender: kvm-ppc-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: kvm-ppc@vger.kernel.org From: Bharat Bhushan Kernel can only access pages which maps as memory. So flush only the valid kernel pages. Signed-off-by: Bharat Bhushan Signed-off-by: Alexander Graf --- arch/powerpc/include/asm/kvm_ppc.h | 9 ++++++++- 1 files changed, 8 insertions(+), 1 deletions(-) diff --git a/arch/powerpc/include/asm/kvm_ppc.h b/arch/powerpc/include/asm/kvm_ppc.h index f589307..4794de6 100644 --- a/arch/powerpc/include/asm/kvm_ppc.h +++ b/arch/powerpc/include/asm/kvm_ppc.h @@ -282,8 +282,15 @@ void kvmppc_init_lpid(unsigned long nr_lpids); static inline void kvmppc_mmu_flush_icache(pfn_t pfn) { - /* Clear i-cache for new pages */ struct page *page; + /* + * We can only access pages that the kernel maps + * as memory. Bail out for unmapped ones. + */ + if (!pfn_valid(pfn)) + return; + + /* Clear i-cache for new pages */ page = pfn_to_page(pfn); if (!test_bit(PG_arch_1, &page->flags)) { flush_dcache_icache_page(page);