Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S964914AbXADPzJ (ORCPT ); Thu, 4 Jan 2007 10:55:09 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S964935AbXADPzJ (ORCPT ); Thu, 4 Jan 2007 10:55:09 -0500 Received: from il.qumranet.com ([62.219.232.206]:39071 "EHLO il.qumranet.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S964914AbXADPzH (ORCPT ); Thu, 4 Jan 2007 10:55:07 -0500 Subject: [PATCH 6/33] KVM: MMU: Use the guest pdptrs instead of mapping cr3 in pae mode From: Avi Kivity Date: Thu, 04 Jan 2007 15:55:06 -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: <20070104155506.3BAD9250048@il.qumranet.com> Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 3058 Lines: 84 This lets us not write protect a partial page, and is anyway what a real processor does. 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 @@ -67,18 +67,28 @@ static void FNAME(walk_addr)(struct gues hpa_t hpa; struct kvm_memory_slot *slot; pt_element_t *ptep; + pt_element_t root; walker->level = vcpu->mmu.root_level; - walker->table_gfn = (vcpu->cr3 & PT64_BASE_ADDR_MASK) >> PAGE_SHIFT; + walker->table = NULL; + root = vcpu->cr3; +#if PTTYPE == 64 + if (!is_long_mode(vcpu)) { + walker->ptep = &vcpu->pdptrs[(addr >> 30) & 3]; + root = *walker->ptep; + if (!(root & PT_PRESENT_MASK)) + return; + --walker->level; + } +#endif + walker->table_gfn = (root & 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); + hpa = safe_gpa_to_hpa(vcpu, root & PT64_BASE_ADDR_MASK); walker->table = kmap_atomic(pfn_to_page(hpa >> PAGE_SHIFT), KM_USER0); ASSERT((!is_long_mode(vcpu) && is_pae(vcpu)) || (vcpu->cr3 & ~(PAGE_MASK | CR3_FLAGS_MASK)) == 0); - walker->table = (pt_element_t *)( (unsigned long)walker->table | - (unsigned long)(vcpu->cr3 & ~(PAGE_MASK | CR3_FLAGS_MASK)) ); walker->inherited_ar = PT_USER_MASK | PT_WRITABLE_MASK; for (;;) { @@ -89,11 +99,8 @@ static void FNAME(walk_addr)(struct gues ASSERT(((unsigned long)walker->table & PAGE_MASK) == ((unsigned long)ptep & PAGE_MASK)); - /* Don't set accessed bit on PAE PDPTRs */ - if (vcpu->mmu.root_level != 3 || walker->level != 3) - if ((*ptep & (PT_PRESENT_MASK | PT_ACCESSED_MASK)) - == PT_PRESENT_MASK) - *ptep |= PT_ACCESSED_MASK; + if (is_present_pte(*ptep) && !(*ptep & PT_ACCESSED_MASK)) + *ptep |= PT_ACCESSED_MASK; if (!is_present_pte(*ptep) || walker->level == PT_PAGE_TABLE_LEVEL || @@ -116,7 +123,8 @@ static void FNAME(walk_addr)(struct gues static void FNAME(release_walker)(struct guest_walker *walker) { - kunmap_atomic(walker->table, KM_USER0); + if (walker->table) + kunmap_atomic(walker->table, KM_USER0); } static void FNAME(set_pte)(struct kvm_vcpu *vcpu, u64 guest_pte, Index: linux-2.6/drivers/kvm/kvm_main.c =================================================================== --- linux-2.6.orig/drivers/kvm/kvm_main.c +++ linux-2.6/drivers/kvm/kvm_main.c @@ -1491,6 +1491,8 @@ static int kvm_dev_ioctl_set_sregs(struc mmu_reset_needed |= vcpu->cr4 != sregs->cr4; kvm_arch_ops->set_cr4(vcpu, sregs->cr4); + if (!is_long_mode(vcpu) && is_pae(vcpu)) + load_pdptrs(vcpu, vcpu->cr3); if (mmu_reset_needed) kvm_mmu_reset_context(vcpu); - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/