From mboxrd@z Thu Jan 1 00:00:00 1970 From: Avi Kivity Subject: [PATCH 27/33] KVM: MMU: Treat user-mode faults as a hint that a page is no longer a page table Date: Thu, 04 Jan 2007 16:16:07 -0000 Message-ID: <20070104161607.7DF5B250048@il.qumranet.com> References: <459D21DD.5090506@qumranet.com> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Cc: akpm-3NddpPZAyC0@public.gmane.org, linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org Return-path: To: kvm-devel-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org In-Reply-To: <459D21DD.5090506-atKUWr5tajBWk0Htik3J/w@public.gmane.org> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: kvm-devel-bounces-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org Errors-To: kvm-devel-bounces-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org List-Id: kvm.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; ------------------------------------------------------------------------- Take Surveys. Earn Cash. Influence the Future of IT Join SourceForge.net's Techsay panel and you'll get the chance to share your opinions on IT & business topics through brief surveys - and earn cash http://www.techsay.com/default.php?page=join.php&p=sourceforge&CID=DEVDEV