From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755536AbXGWHA3 (ORCPT ); Mon, 23 Jul 2007 03:00:29 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1764188AbXGWG5S (ORCPT ); Mon, 23 Jul 2007 02:57:18 -0400 Received: from mga01.intel.com ([192.55.52.88]:55412 "EHLO mga01.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1761247AbXGWG46 (ORCPT ); Mon, 23 Jul 2007 02:56:58 -0400 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="4.16,569,1175497200"; d="scan'208";a="271462932" Subject: [RFC 6/8]KVM: introduce kvm_mmu_zap_pagetbl From: Shaohua Li To: kvm-devel , lkml Cc: Avi Kivity , Ingo Molnar Content-Type: text/plain Date: Mon, 23 Jul 2007 14:51:43 +0800 Message-Id: <1185173503.2645.70.camel@sli10-conroe.sh.intel.com> Mime-Version: 1.0 X-Mailer: Evolution 2.8.3 (2.8.3-2.fc6) Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org add a routine to zap all shadow pgtble for a gfn. If kvm supports SMP, the API should zap pgtble for all vcpus, but kvm shadow page table really should be per-vm, instead of per-vcpu. Signed-off-by: Shaohua Li --- drivers/kvm/kvm.h | 1 + drivers/kvm/mmu.c | 28 ++++++++++++++++++++++++++++ 2 files changed, 29 insertions(+) Index: linux/drivers/kvm/kvm.h =================================================================== --- linux.orig/drivers/kvm/kvm.h 2007-07-20 14:19:15.000000000 +0800 +++ linux/drivers/kvm/kvm.h 2007-07-20 14:26:10.000000000 +0800 @@ -621,6 +621,7 @@ int kvm_mmu_unprotect_page_virt(struct k void kvm_mmu_free_some_pages(struct kvm_vcpu *vcpu); int kvm_mmu_load(struct kvm_vcpu *vcpu); void kvm_mmu_unload(struct kvm_vcpu *vcpu); +void kvm_mmu_zap_pagetbl(struct kvm_vcpu *vcpu, u64 gfn); int kvm_hypercall(struct kvm_vcpu *vcpu, struct kvm_run *run); Index: linux/drivers/kvm/mmu.c =================================================================== --- linux.orig/drivers/kvm/mmu.c 2007-07-20 14:25:25.000000000 +0800 +++ linux/drivers/kvm/mmu.c 2007-07-20 14:26:10.000000000 +0800 @@ -1324,6 +1324,34 @@ void kvm_mmu_zap_all(struct kvm_vcpu *vc init_kvm_mmu(vcpu); } +/* FIXME: this should zap all vcpu's shadow pgtbl for gfn */ +void kvm_mmu_zap_pagetbl(struct kvm_vcpu *vcpu, u64 gfn) +{ + struct kvm *kvm = vcpu->kvm; + struct kvm_rmap_desc *desc; + struct page *page; + u64 *spte; + + page = gfn_to_page(kvm, gfn); + BUG_ON(!page); + + while (page_private(page)) { + if (!(page_private(page) & 1)) + spte = (u64 *)page_private(page); + else { + desc = (struct kvm_rmap_desc *)(page_private(page) & ~1ul); + spte = desc->shadow_ptes[0]; + } + BUG_ON(!spte); + BUG_ON((*spte & PT64_BASE_ADDR_MASK) >> PAGE_SHIFT + != page_to_pfn(page)); + BUG_ON(!(*spte & PT_PRESENT_MASK)); + rmap_remove(vcpu, spte); + *spte = 0; + } + kvm_flush_remote_tlbs(vcpu->kvm); +} + void kvm_mmu_module_exit(void) { if (pte_chain_cache)