From mboxrd@z Thu Jan 1 00:00:00 1970 From: Avi Kivity Subject: [PATCH 2/33] KVM: MMU: Teach the page table walker to track guest page table gfns Date: Thu, 04 Jan 2007 15:51:05 -0000 Message-ID: <20070104155105.AD445250048@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 Saving the table gfns removes the need to walk the guest and host page tables in lockstep. 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 @@ -52,6 +52,7 @@ */ struct guest_walker { int level; + gfn_t table_gfn; pt_element_t *table; pt_element_t inherited_ar; }; @@ -63,8 +64,8 @@ static void FNAME(init_walker)(struct gu struct kvm_memory_slot *slot; walker->level = vcpu->mmu.root_level; - slot = gfn_to_memslot(vcpu->kvm, - (vcpu->cr3 & PT64_BASE_ADDR_MASK) >> PAGE_SHIFT); + walker->table_gfn = (vcpu->cr3 & PT64_BASE_ADDR_MASK) >> PAGE_SHIFT; + slot = gfn_to_memslot(vcpu->kvm, walker->table_gfn); hpa = safe_gpa_to_hpa(vcpu, vcpu->cr3 & PT64_BASE_ADDR_MASK); walker->table = kmap_atomic(pfn_to_page(hpa >> PAGE_SHIFT), KM_USER0); @@ -133,6 +134,8 @@ static pt_element_t *FNAME(fetch_guest)( return &walker->table[index]; if (walker->level != 3 || is_long_mode(vcpu)) walker->inherited_ar &= walker->table[index]; + walker->table_gfn = (walker->table[index] & PT_BASE_ADDR_MASK) + >> PAGE_SHIFT; paddr = safe_gpa_to_hpa(vcpu, walker->table[index] & PT_BASE_ADDR_MASK); kunmap_atomic(walker->table, KM_USER0); walker->table = kmap_atomic(pfn_to_page(paddr >> PAGE_SHIFT), ------------------------------------------------------------------------- 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