From patchwork Sun Aug 23 11:56:32 2009 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Avi Kivity X-Patchwork-Id: 43427 Received: from vger.kernel.org (vger.kernel.org [209.132.176.167]) by demeter.kernel.org (8.14.2/8.14.2) with ESMTP id n7NC7Qep005531 for ; Sun, 23 Aug 2009 12:07:28 GMT Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S933721AbZHWMBc (ORCPT ); Sun, 23 Aug 2009 08:01:32 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S933689AbZHWMAW (ORCPT ); Sun, 23 Aug 2009 08:00:22 -0400 Received: from mx1.redhat.com ([209.132.183.28]:54468 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S933548AbZHWL4u (ORCPT ); Sun, 23 Aug 2009 07:56:50 -0400 Received: from int-mx05.intmail.prod.int.phx2.redhat.com (int-mx05.intmail.prod.int.phx2.redhat.com [10.5.11.18]) by mx1.redhat.com (8.13.8/8.13.8) with ESMTP id n7NBuqFL031246; Sun, 23 Aug 2009 07:56:52 -0400 Received: from cleopatra.tlv.redhat.com (cleopatra.tlv.redhat.com [10.35.255.11]) by int-mx05.intmail.prod.int.phx2.redhat.com (8.13.8/8.13.8) with ESMTP id n7NBumxV010258; Sun, 23 Aug 2009 07:56:51 -0400 Received: from localhost.localdomain (cleopatra.tlv.redhat.com [10.35.255.11]) by cleopatra.tlv.redhat.com (Postfix) with ESMTP id 3333A250AE6; Sun, 23 Aug 2009 14:56:47 +0300 (IDT) From: Avi Kivity To: kvm@vger.kernel.org Cc: linux-kernel@vger.kernel.org Subject: [PATCH 33/46] KVM: VMX: Introduce KVM_SET_IDENTITY_MAP_ADDR ioctl Date: Sun, 23 Aug 2009 14:56:32 +0300 Message-Id: <1251028605-31977-34-git-send-email-avi@redhat.com> In-Reply-To: <1251028605-31977-1-git-send-email-avi@redhat.com> References: <1251028605-31977-1-git-send-email-avi@redhat.com> X-Scanned-By: MIMEDefang 2.67 on 10.5.11.18 Sender: kvm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org From: Sheng Yang Now KVM allow guest to modify guest's physical address of EPT's identity mapping page. (change from v1, discard unnecessary check, change ioctl to accept parameter address rather than value) Signed-off-by: Sheng Yang Signed-off-by: Marcelo Tosatti --- arch/x86/include/asm/kvm_host.h | 1 + arch/x86/kvm/vmx.c | 15 ++++++++++----- arch/x86/kvm/x86.c | 19 +++++++++++++++++++ include/linux/kvm.h | 2 ++ 4 files changed, 32 insertions(+), 5 deletions(-) diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h index 08732d7..e210b21 100644 --- a/arch/x86/include/asm/kvm_host.h +++ b/arch/x86/include/asm/kvm_host.h @@ -411,6 +411,7 @@ struct kvm_arch{ struct page *ept_identity_pagetable; bool ept_identity_pagetable_done; + gpa_t ept_identity_map_addr; unsigned long irq_sources_bitmap; unsigned long irq_states[KVM_IOAPIC_NUM_PINS]; diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c index c6256b9..686e1ab 100644 --- a/arch/x86/kvm/vmx.c +++ b/arch/x86/kvm/vmx.c @@ -1719,7 +1719,7 @@ static void vmx_set_cr3(struct kvm_vcpu *vcpu, unsigned long cr3) eptp = construct_eptp(cr3); vmcs_write64(EPT_POINTER, eptp); guest_cr3 = is_paging(vcpu) ? vcpu->arch.cr3 : - VMX_EPT_IDENTITY_PAGETABLE_ADDR; + vcpu->kvm->arch.ept_identity_map_addr; } vmx_flush_tlb(vcpu); @@ -2122,7 +2122,7 @@ static int init_rmode_identity_map(struct kvm *kvm) if (likely(kvm->arch.ept_identity_pagetable_done)) return 1; ret = 0; - identity_map_pfn = VMX_EPT_IDENTITY_PAGETABLE_ADDR >> PAGE_SHIFT; + identity_map_pfn = kvm->arch.ept_identity_map_addr >> PAGE_SHIFT; r = kvm_clear_guest_page(kvm, identity_map_pfn, 0, PAGE_SIZE); if (r < 0) goto out; @@ -2191,14 +2191,15 @@ static int alloc_identity_pagetable(struct kvm *kvm) goto out; kvm_userspace_mem.slot = IDENTITY_PAGETABLE_PRIVATE_MEMSLOT; kvm_userspace_mem.flags = 0; - kvm_userspace_mem.guest_phys_addr = VMX_EPT_IDENTITY_PAGETABLE_ADDR; + kvm_userspace_mem.guest_phys_addr = + kvm->arch.ept_identity_map_addr; kvm_userspace_mem.memory_size = PAGE_SIZE; r = __kvm_set_memory_region(kvm, &kvm_userspace_mem, 0); if (r) goto out; kvm->arch.ept_identity_pagetable = gfn_to_page(kvm, - VMX_EPT_IDENTITY_PAGETABLE_ADDR >> PAGE_SHIFT); + kvm->arch.ept_identity_map_addr >> PAGE_SHIFT); out: up_write(&kvm->slots_lock); return r; @@ -3814,9 +3815,13 @@ static struct kvm_vcpu *vmx_create_vcpu(struct kvm *kvm, unsigned int id) if (alloc_apic_access_page(kvm) != 0) goto free_vmcs; - if (enable_ept) + if (enable_ept) { + if (!kvm->arch.ept_identity_map_addr) + kvm->arch.ept_identity_map_addr = + VMX_EPT_IDENTITY_PAGETABLE_ADDR; if (alloc_identity_pagetable(kvm) != 0) goto free_vmcs; + } return &vmx->vcpu; diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c index 18ce27f..2539e9a 100644 --- a/arch/x86/kvm/x86.c +++ b/arch/x86/kvm/x86.c @@ -1206,6 +1206,7 @@ int kvm_dev_ioctl_check_extension(long ext) case KVM_CAP_IOEVENTFD: case KVM_CAP_PIT2: case KVM_CAP_PIT_STATE2: + case KVM_CAP_SET_IDENTITY_MAP_ADDR: r = 1; break; case KVM_CAP_COALESCED_MMIO: @@ -1906,6 +1907,13 @@ static int kvm_vm_ioctl_set_tss_addr(struct kvm *kvm, unsigned long addr) return ret; } +static int kvm_vm_ioctl_set_identity_map_addr(struct kvm *kvm, + u64 ident_addr) +{ + kvm->arch.ept_identity_map_addr = ident_addr; + return 0; +} + static int kvm_vm_ioctl_set_nr_mmu_pages(struct kvm *kvm, u32 kvm_nr_mmu_pages) { @@ -2169,6 +2177,17 @@ long kvm_arch_vm_ioctl(struct file *filp, if (r < 0) goto out; break; + case KVM_SET_IDENTITY_MAP_ADDR: { + u64 ident_addr; + + r = -EFAULT; + if (copy_from_user(&ident_addr, argp, sizeof ident_addr)) + goto out; + r = kvm_vm_ioctl_set_identity_map_addr(kvm, ident_addr); + if (r < 0) + goto out; + break; + } case KVM_SET_MEMORY_REGION: { struct kvm_memory_region kvm_mem; struct kvm_userspace_memory_region kvm_userspace_mem; diff --git a/include/linux/kvm.h b/include/linux/kvm.h index 230a91a..f8f8900 100644 --- a/include/linux/kvm.h +++ b/include/linux/kvm.h @@ -435,6 +435,7 @@ struct kvm_ioeventfd { #define KVM_CAP_PIT_STATE2 35 #endif #define KVM_CAP_IOEVENTFD 36 +#define KVM_CAP_SET_IDENTITY_MAP_ADDR 37 #ifdef KVM_CAP_IRQ_ROUTING @@ -512,6 +513,7 @@ struct kvm_irqfd { #define KVM_SET_USER_MEMORY_REGION _IOW(KVMIO, 0x46,\ struct kvm_userspace_memory_region) #define KVM_SET_TSS_ADDR _IO(KVMIO, 0x47) +#define KVM_SET_IDENTITY_MAP_ADDR _IOW(KVMIO, 0x48, __u64) /* Device model IOC */ #define KVM_CREATE_IRQCHIP _IO(KVMIO, 0x60) #define KVM_IRQ_LINE _IOW(KVMIO, 0x61, struct kvm_irq_level)