From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S965010AbXADQQZ (ORCPT ); Thu, 4 Jan 2007 11:16:25 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S965011AbXADQQZ (ORCPT ); Thu, 4 Jan 2007 11:16:25 -0500 Received: from il.qumranet.com ([62.219.232.206]:51734 "EHLO il.qumranet.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S965010AbXADQQJ (ORCPT ); Thu, 4 Jan 2007 11:16:09 -0500 Subject: [PATCH 27/33] KVM: MMU: Treat user-mode faults as a hint that a page is no longer a page table From: Avi Kivity Date: Thu, 04 Jan 2007 16:16:07 -0000 To: kvm-devel@lists.sourceforge.net Cc: linux-kernel@vger.kernel.org, akpm@osdl.org, mingo@elte.hu References: <459D21DD.5090506@qumranet.com> In-Reply-To: <459D21DD.5090506@qumranet.com> Message-Id: <20070104161607.7DF5B250048@il.qumranet.com> Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Signed-off-by: Avi Kivity Index: linux-2.6/drivers/kvm/paging_tmpl.h =================================================================== --- linux-2.6.orig/drivers/kvm/paging_tmpl.h +++ linux-2.6/drivers/kvm/paging_tmpl.h @@ -271,6 +271,7 @@ static int FNAME(fix_write_pf)(struct kv pt_element_t *guest_ent; int writable_shadow; gfn_t gfn; + struct kvm_mmu_page *page; if (is_writeble_pte(*shadow_ent)) return 0; @@ -303,7 +304,17 @@ static int FNAME(fix_write_pf)(struct kv } gfn = walker->gfn; - if (kvm_mmu_lookup_page(vcpu, gfn)) { + + if (user) { + /* + * Usermode page faults won't be for page table updates. + */ + while ((page = kvm_mmu_lookup_page(vcpu, gfn)) != NULL) { + pgprintk("%s: zap %lx %x\n", + __FUNCTION__, gfn, page->role.word); + kvm_mmu_zap_page(vcpu, page); + } + } else if (kvm_mmu_lookup_page(vcpu, gfn)) { pgprintk("%s: found shadow page for %lx, marking ro\n", __FUNCTION__, gfn); *write_pt = 1;