Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S964948AbXADQEJ (ORCPT ); Thu, 4 Jan 2007 11:04:09 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S964965AbXADQEJ (ORCPT ); Thu, 4 Jan 2007 11:04:09 -0500 Received: from il.qumranet.com ([62.219.232.206]:46935 "EHLO il.qumranet.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S964948AbXADQEI (ORCPT ); Thu, 4 Jan 2007 11:04:08 -0500 Subject: [PATCH 15/33] KVM: MMU: Implement child shadow unlinking From: Avi Kivity Date: Thu, 04 Jan 2007 16:04:06 -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: <20070104160406.E660A250048@il.qumranet.com> Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 2846 Lines: 96 When removing a page table, we must maintain the parent_pte field all child shadow page tables. Signed-off-by: Avi Kivity Index: linux-2.6/drivers/kvm/mmu.c =================================================================== --- linux-2.6.orig/drivers/kvm/mmu.c +++ linux-2.6/drivers/kvm/mmu.c @@ -402,12 +402,21 @@ static void mmu_page_remove_parent_pte(s break; if (pte_chain->parent_ptes[i] != parent_pte) continue; - while (i + 1 < NR_PTE_CHAIN_ENTRIES) { + while (i + 1 < NR_PTE_CHAIN_ENTRIES + && pte_chain->parent_ptes[i + 1]) { pte_chain->parent_ptes[i] = pte_chain->parent_ptes[i + 1]; ++i; } pte_chain->parent_ptes[i] = NULL; + if (i == 0) { + hlist_del(&pte_chain->link); + kfree(pte_chain); + if (hlist_empty(&page->parent_ptes)) { + page->multimapped = 0; + page->parent_pte = NULL; + } + } return; } BUG(); @@ -481,7 +490,30 @@ static struct kvm_mmu_page *kvm_mmu_get_ static void kvm_mmu_page_unlink_children(struct kvm_vcpu *vcpu, struct kvm_mmu_page *page) { - BUG(); + unsigned i; + u64 *pt; + u64 ent; + + pt = __va(page->page_hpa); + + if (page->role.level == PT_PAGE_TABLE_LEVEL) { + for (i = 0; i < PT64_ENT_PER_PAGE; ++i) { + if (pt[i] & PT_PRESENT_MASK) + rmap_remove(vcpu->kvm, &pt[i]); + pt[i] = 0; + } + return; + } + + for (i = 0; i < PT64_ENT_PER_PAGE; ++i) { + ent = pt[i]; + + pt[i] = 0; + if (!(ent & PT_PRESENT_MASK)) + continue; + ent &= PT64_BASE_ADDR_MASK; + mmu_page_remove_parent_pte(page_header(ent), &pt[i]); + } } static void kvm_mmu_put_page(struct kvm_vcpu *vcpu, @@ -489,8 +521,7 @@ static void kvm_mmu_put_page(struct kvm_ u64 *parent_pte) { mmu_page_remove_parent_pte(page, parent_pte); - if (page->role.level > PT_PAGE_TABLE_LEVEL) - kvm_mmu_page_unlink_children(vcpu, page); + kvm_mmu_page_unlink_children(vcpu, page); hlist_del(&page->hash_link); list_del(&page->link); list_add(&page->link, &vcpu->free_pages); @@ -511,6 +542,7 @@ static void kvm_mmu_zap_page(struct kvm_ struct kvm_pte_chain, link); parent_pte = chain->parent_ptes[0]; } + BUG_ON(!parent_pte); kvm_mmu_put_page(vcpu, page, parent_pte); *parent_pte = 0; } @@ -530,6 +562,8 @@ static int kvm_mmu_unprotect_page(struct bucket = &vcpu->kvm->mmu_page_hash[index]; hlist_for_each_entry_safe(page, node, n, bucket, hash_link) if (page->gfn == gfn && !page->role.metaphysical) { + pgprintk("%s: gfn %lx role %x\n", __FUNCTION__, gfn, + page->role.word); kvm_mmu_zap_page(vcpu, page); r = 1; } - 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/