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Mon, 30 Mar 2020 06:23:04 +0000 From: Ashish Kalra To: pbonzini@redhat.com Cc: tglx@linutronix.de, mingo@redhat.com, hpa@zytor.com, joro@8bytes.org, bp@suse.de, thomas.lendacky@amd.com, x86@kernel.org, kvm@vger.kernel.org, linux-kernel@vger.kernel.org, rientjes@google.com, srutherford@google.com, luto@kernel.org, brijesh.singh@amd.com Subject: [PATCH v6 11/14] KVM: x86: Introduce KVM_SET_PAGE_ENC_BITMAP ioctl Date: Mon, 30 Mar 2020 06:22:55 +0000 Message-Id: <4d4fbe2b9acda82c04834682900acf782182ec23.1585548051.git.ashish.kalra@amd.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: References: Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-ClientProxiedBy: DM5PR17CA0060.namprd17.prod.outlook.com (2603:10b6:3:13f::22) To DM5PR12MB1386.namprd12.prod.outlook.com (2603:10b6:3:77::9) MIME-Version: 1.0 X-MS-Exchange-MessageSentRepresentingType: 1 Received: from ashkalra_ubuntu_server.amd.com (165.204.77.1) by DM5PR17CA0060.namprd17.prod.outlook.com (2603:10b6:3:13f::22) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.2856.20 via Frontend Transport; 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Cc: Thomas Gleixner Cc: Ingo Molnar Cc: "H. Peter Anvin" Cc: Paolo Bonzini Cc: "Radim Krčmář" Cc: Joerg Roedel Cc: Borislav Petkov Cc: Tom Lendacky Cc: x86@kernel.org Cc: kvm@vger.kernel.org Cc: linux-kernel@vger.kernel.org Signed-off-by: Brijesh Singh Signed-off-by: Ashish Kalra --- Documentation/virt/kvm/api.rst | 22 +++++++++++++++++ arch/x86/include/asm/kvm_host.h | 2 ++ arch/x86/kvm/svm.c | 42 +++++++++++++++++++++++++++++++++ arch/x86/kvm/x86.c | 12 ++++++++++ include/uapi/linux/kvm.h | 1 + 5 files changed, 79 insertions(+) diff --git a/Documentation/virt/kvm/api.rst b/Documentation/virt/kvm/api.rst index 8ad800ebb54f..4d1004a154f6 100644 --- a/Documentation/virt/kvm/api.rst +++ b/Documentation/virt/kvm/api.rst @@ -4675,6 +4675,28 @@ or shared. The bitmap can be used during the guest migration, if the page is private then userspace need to use SEV migration commands to transmit the page. +4.126 KVM_SET_PAGE_ENC_BITMAP (vm ioctl) +--------------------------------------- + +:Capability: basic +:Architectures: x86 +:Type: vm ioctl +:Parameters: struct kvm_page_enc_bitmap (in/out) +:Returns: 0 on success, -1 on error + +/* for KVM_SET_PAGE_ENC_BITMAP */ +struct kvm_page_enc_bitmap { + __u64 start_gfn; + __u64 num_pages; + union { + void __user *enc_bitmap; /* one bit per page */ + __u64 padding2; + }; +}; + +During the guest live migration the outgoing guest exports its page encryption +bitmap, the KVM_SET_PAGE_ENC_BITMAP can be used to build the page encryption +bitmap for an incoming guest. 5. The kvm_run structure ======================== diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h index 27e43e3ec9d8..d30f770aaaea 100644 --- a/arch/x86/include/asm/kvm_host.h +++ b/arch/x86/include/asm/kvm_host.h @@ -1271,6 +1271,8 @@ struct kvm_x86_ops { unsigned long sz, unsigned long mode); int (*get_page_enc_bitmap)(struct kvm *kvm, struct kvm_page_enc_bitmap *bmap); + int (*set_page_enc_bitmap)(struct kvm *kvm, + struct kvm_page_enc_bitmap *bmap); }; struct kvm_arch_async_pf { diff --git a/arch/x86/kvm/svm.c b/arch/x86/kvm/svm.c index bae783cd396a..313343a43045 100644 --- a/arch/x86/kvm/svm.c +++ b/arch/x86/kvm/svm.c @@ -7756,6 +7756,47 @@ static int svm_get_page_enc_bitmap(struct kvm *kvm, return ret; } +static int svm_set_page_enc_bitmap(struct kvm *kvm, + struct kvm_page_enc_bitmap *bmap) +{ + struct kvm_sev_info *sev = &to_kvm_svm(kvm)->sev_info; + unsigned long gfn_start, gfn_end; + unsigned long *bitmap; + unsigned long sz, i; + int ret; + + if (!sev_guest(kvm)) + return -ENOTTY; + + gfn_start = bmap->start_gfn; + gfn_end = gfn_start + bmap->num_pages; + + sz = ALIGN(bmap->num_pages, BITS_PER_LONG) / 8; + bitmap = kmalloc(sz, GFP_KERNEL); + if (!bitmap) + return -ENOMEM; + + ret = -EFAULT; + if (copy_from_user(bitmap, bmap->enc_bitmap, sz)) + goto out; + + mutex_lock(&kvm->lock); + ret = sev_resize_page_enc_bitmap(kvm, gfn_end); + if (ret) + goto unlock; + + i = gfn_start; + for_each_clear_bit_from(i, bitmap, (gfn_end - gfn_start)) + clear_bit(i + gfn_start, sev->page_enc_bmap); + + ret = 0; +unlock: + mutex_unlock(&kvm->lock); +out: + kfree(bitmap); + return ret; +} + static int svm_mem_enc_op(struct kvm *kvm, void __user *argp) { struct kvm_sev_cmd sev_cmd; @@ -8161,6 +8202,7 @@ static struct kvm_x86_ops svm_x86_ops __ro_after_init = { .page_enc_status_hc = svm_page_enc_status_hc, .get_page_enc_bitmap = svm_get_page_enc_bitmap, + .set_page_enc_bitmap = svm_set_page_enc_bitmap, }; static int __init svm_init(void) diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c index 3c3fea4e20b5..05e953b2ec61 100644 --- a/arch/x86/kvm/x86.c +++ b/arch/x86/kvm/x86.c @@ -5238,6 +5238,18 @@ long kvm_arch_vm_ioctl(struct file *filp, r = kvm_x86_ops->get_page_enc_bitmap(kvm, &bitmap); break; } + case KVM_SET_PAGE_ENC_BITMAP: { + struct kvm_page_enc_bitmap bitmap; + + r = -EFAULT; + if (copy_from_user(&bitmap, argp, sizeof(bitmap))) + goto out; + + r = -ENOTTY; + if (kvm_x86_ops->set_page_enc_bitmap) + r = kvm_x86_ops->set_page_enc_bitmap(kvm, &bitmap); + break; + } default: r = -ENOTTY; } diff --git a/include/uapi/linux/kvm.h b/include/uapi/linux/kvm.h index db1ebf85e177..b4b01d47e568 100644 --- a/include/uapi/linux/kvm.h +++ b/include/uapi/linux/kvm.h @@ -1489,6 +1489,7 @@ struct kvm_enc_region { #define KVM_S390_CLEAR_RESET _IO(KVMIO, 0xc4) #define KVM_GET_PAGE_ENC_BITMAP _IOW(KVMIO, 0xc5, struct kvm_page_enc_bitmap) +#define KVM_SET_PAGE_ENC_BITMAP _IOW(KVMIO, 0xc6, struct kvm_page_enc_bitmap) /* Secure Encrypted Virtualization command */ enum sev_cmd_id { -- 2.17.1