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Fri, 3 Apr 2020 21:46:01 +0000 Date: Fri, 3 Apr 2020 21:45:59 +0000 From: Ashish Kalra To: Krish Sadhukhan Cc: pbonzini@redhat.com, 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: Re: [PATCH v6 12/14] KVM: x86: Introduce KVM_PAGE_ENC_BITMAP_RESET ioctl Message-ID: <20200403214559.GB28747@ashkalra_ubuntu_server> References: <9e959ee134ad77f62c9881b8c54cd27e35055072.1585548051.git.ashish.kalra@amd.com> Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.9.4 (2018-02-28) X-ClientProxiedBy: DM6PR02CA0067.namprd02.prod.outlook.com (2603:10b6:5:177::44) 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 (165.204.77.1) by DM6PR02CA0067.namprd02.prod.outlook.com (2603:10b6:5:177::44) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.2878.16 via Frontend Transport; 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X-Microsoft-Antispam-Message-Info: zee9q4eATn2oYzAF+wgtHlydIHeBY2WwsISd9evmkDwIp0QuMm3vEoj6FRzb+C5T1u6qPMJT7tlXvaoueKI+ImqJG8/3SahsS6wJYr4//jxYdNicb2tAMIPbe6cXGFYkhqlDvI/ACOo4hM3rXyefOud/3GLSB4UhgP81hbXg71s6T+Nqc21lbk4aTKPr2Tv5TbmvQxvE9Cp0zLiLAnolOpe7y20ZWXWWQ2ArNyHfeaAWEmBVWwcr2M3iISg3RcyyE1+RMLexML+ltxXWJueqBTunUdZyyvJHnpPlDmGpNFhYcLlwGL2xeh9V2b4UttwW9SRduMqz1uDddJl1w/2Vp3vAGVKaLTqlsnDhjdc6Lu5FhPSV96SXFs1RgROyHMHB4/tI7bxEpT49uyXE2lewVaqkPwPwydUDEANcAIBIzu1Osg7GVdlBQe+AroBvp8qB X-MS-Exchange-AntiSpam-MessageData: eXoImM4QSph/5eebXFgnBJACeEuFabpx245UkHeRTwxyIBq3omh5ZC/lB65c5op0paHRSTNtNzkx0sSLMxKwJ5juwqRjuJ9Uwu+L+fdIahcKiz3b6oN+K4+aKsYK/N6UHqZKZ6oN3tuhQRbEXbIsbA== X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-Network-Message-Id: 3d04e49e-e1ad-403d-bb07-08d7d81866fe X-MS-Exchange-CrossTenant-OriginalArrivalTime: 03 Apr 2020 21:46:01.7138 (UTC) X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted X-MS-Exchange-CrossTenant-Id: 3dd8961f-e488-4e60-8e11-a82d994e183d X-MS-Exchange-CrossTenant-MailboxType: HOSTED X-MS-Exchange-CrossTenant-UserPrincipalName: B8q3srQ8GLTtK3MAO2fmssiIhJKAAU47CmbRdVaWIzqSviWFjEPsACgg5zy4e/Wus1IcM3zx0FKp+DCkgwwaYg== X-MS-Exchange-Transport-CrossTenantHeadersStamped: DM5PR12MB1465 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Fri, Apr 03, 2020 at 02:14:23PM -0700, Krish Sadhukhan wrote: > > On 3/29/20 11:23 PM, Ashish Kalra wrote: > > From: Ashish Kalra > > > > This ioctl can be used by the application to reset the page > > encryption bitmap managed by the KVM driver. A typical usage > > for this ioctl is on VM reboot, on reboot, we must reinitialize > > the bitmap. > > > > Signed-off-by: Ashish Kalra > > --- > > Documentation/virt/kvm/api.rst | 13 +++++++++++++ > > arch/x86/include/asm/kvm_host.h | 1 + > > arch/x86/kvm/svm.c | 16 ++++++++++++++++ > > arch/x86/kvm/x86.c | 6 ++++++ > > include/uapi/linux/kvm.h | 1 + > > 5 files changed, 37 insertions(+) > > > > diff --git a/Documentation/virt/kvm/api.rst b/Documentation/virt/kvm/api.rst > > index 4d1004a154f6..a11326ccc51d 100644 > > --- a/Documentation/virt/kvm/api.rst > > +++ b/Documentation/virt/kvm/api.rst > > @@ -4698,6 +4698,19 @@ 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. > > +4.127 KVM_PAGE_ENC_BITMAP_RESET (vm ioctl) > > +----------------------------------------- > > + > > +:Capability: basic > > +:Architectures: x86 > > +:Type: vm ioctl > > +:Parameters: none > > +:Returns: 0 on success, -1 on error > > + > > +The KVM_PAGE_ENC_BITMAP_RESET is used to reset the guest's page encryption > > +bitmap during guest reboot and this is only done on the guest's boot vCPU. > > + > > + > > 5. The kvm_run structure > > ======================== > > diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h > > index d30f770aaaea..a96ef6338cd2 100644 > > --- a/arch/x86/include/asm/kvm_host.h > > +++ b/arch/x86/include/asm/kvm_host.h > > @@ -1273,6 +1273,7 @@ struct kvm_x86_ops { > > struct kvm_page_enc_bitmap *bmap); > > int (*set_page_enc_bitmap)(struct kvm *kvm, > > struct kvm_page_enc_bitmap *bmap); > > + int (*reset_page_enc_bitmap)(struct kvm *kvm); > > }; > > struct kvm_arch_async_pf { > > diff --git a/arch/x86/kvm/svm.c b/arch/x86/kvm/svm.c > > index 313343a43045..c99b0207a443 100644 > > --- a/arch/x86/kvm/svm.c > > +++ b/arch/x86/kvm/svm.c > > @@ -7797,6 +7797,21 @@ static int svm_set_page_enc_bitmap(struct kvm *kvm, > > return ret; > > } > > +static int svm_reset_page_enc_bitmap(struct kvm *kvm) > > +{ > > + struct kvm_sev_info *sev = &to_kvm_svm(kvm)->sev_info; > > + > > + if (!sev_guest(kvm)) > > + return -ENOTTY; > > + > > + mutex_lock(&kvm->lock); > > + /* by default all pages should be marked encrypted */ > > + if (sev->page_enc_bmap_size) > > + bitmap_fill(sev->page_enc_bmap, sev->page_enc_bmap_size); > > + mutex_unlock(&kvm->lock); > > + return 0; > > +} > > + > > static int svm_mem_enc_op(struct kvm *kvm, void __user *argp) > > { > > struct kvm_sev_cmd sev_cmd; > > @@ -8203,6 +8218,7 @@ 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, > > + .reset_page_enc_bitmap = svm_reset_page_enc_bitmap, > > > We don't need to initialize the intel ops to NULL ? It's not initialized in > the previous patch either. > > > }; This struct is declared as "static storage", so won't the non-initialized members be 0 ? > > static int __init svm_init(void) > > diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c > > index 05e953b2ec61..2127ed937f53 100644 > > --- a/arch/x86/kvm/x86.c > > +++ b/arch/x86/kvm/x86.c > > @@ -5250,6 +5250,12 @@ long kvm_arch_vm_ioctl(struct file *filp, > > r = kvm_x86_ops->set_page_enc_bitmap(kvm, &bitmap); > > break; > > } > > + case KVM_PAGE_ENC_BITMAP_RESET: { > > + r = -ENOTTY; > > + if (kvm_x86_ops->reset_page_enc_bitmap) > > + r = kvm_x86_ops->reset_page_enc_bitmap(kvm); > > + break; > > + } > > default: > > r = -ENOTTY; > > } > > diff --git a/include/uapi/linux/kvm.h b/include/uapi/linux/kvm.h > > index b4b01d47e568..0884a581fc37 100644 > > --- a/include/uapi/linux/kvm.h > > +++ b/include/uapi/linux/kvm.h > > @@ -1490,6 +1490,7 @@ struct kvm_enc_region { > > #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) > > +#define KVM_PAGE_ENC_BITMAP_RESET _IO(KVMIO, 0xc7) > > /* Secure Encrypted Virtualization command */ > > enum sev_cmd_id { > Reviewed-by: Krish Sadhukhan