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Thu, 15 Aug 2019 16:25:07 +0000 From: "Suthikulpanit, Suravee" To: "linux-kernel@vger.kernel.org" , "kvm@vger.kernel.org" CC: "pbonzini@redhat.com" , "rkrcmar@redhat.com" , "joro@8bytes.org" , "graf@amazon.com" , "jschoenh@amazon.de" , "karahmed@amazon.de" , "rimasluk@amazon.com" , "Grimm, Jon" , "Suthikulpanit, Suravee" Subject: [PATCH v2 04/15] kvm: x86: Add per-VM APICv state debugfs Thread-Topic: [PATCH v2 04/15] kvm: x86: Add per-VM APICv state debugfs Thread-Index: AQHVU4YAxicok8C98kOOsiSZW3JVFQ== Date: Thu, 15 Aug 2019 16:25:07 +0000 Message-ID: <1565886293-115836-5-git-send-email-suravee.suthikulpanit@amd.com> References: <1565886293-115836-1-git-send-email-suravee.suthikulpanit@amd.com> In-Reply-To: <1565886293-115836-1-git-send-email-suravee.suthikulpanit@amd.com> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [165.204.78.1] x-clientproxiedby: SN6PR04CA0084.namprd04.prod.outlook.com (2603:10b6:805:f2::25) To DM6PR12MB2844.namprd12.prod.outlook.com (2603:10b6:5:45::32) authentication-results: spf=none (sender IP is ) smtp.mailfrom=Suravee.Suthikulpanit@amd.com; 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received-spf: None (protection.outlook.com: amd.com does not designate permitted sender hosts) x-ms-exchange-senderadcheck: 1 x-microsoft-antispam-message-info: S1Dx35ion5Lf6nrMqz/FYzZ+n/16lsbpMvEjN2w5k/SVxONBbCvYfOvtXlsmHWc7ZXDowH3LVpFaGUMVH5IYTf1ndqeCGhT+M/AALOEdpH6tvM7eKgcddsc82IZZDT6PsMESOJ0S6UlV/BSlqT6xdjsPxkte8u+0nSt0gda5nGX55ZATYt7jNsIJxwuqWQ5PROP0CUFlOPkSzqkwMI24XDwelKQolQ085VqCHYFfju3QGRjYZmp+pCpREWcyLh588/aE151WM1TPKiYi45lngAf9EJKCslQAFOmBwEWu+dGfj5Y+6A2P7PEBswsGFRwO0hUCrVX2J0zPlW/1rppiqos0xb7Ye65SOWGtAM+WEZo3ecIKrduTfvuDQETEbvr/lOd5P+n2MXTkfTIpDTi/wdQ4TNDCSiz1Lgl7kh1z4O8= Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-Network-Message-Id: 1875c1d5-78df-4ada-6141-08d7219d227e X-MS-Exchange-CrossTenant-originalarrivaltime: 15 Aug 2019 16:25:07.1792 (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: 8upNslNbzqyLedx05BSP/Gdh9o8U9OTSPM5po3nakSIaEKylJ3sAyIk4fFzXQNGJKEwVBDCbeLXjM5itB4QiEA== X-MS-Exchange-Transport-CrossTenantHeadersStamped: DM6PR12MB3897 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Currently, there is no way to tell whether APICv is active on a particular VM. This often cause confusion since APICv can be deactivated at runtime. Introduce a debugfs entry to report APICv state of a VM. This creates a read-only file: /sys/kernel/debug/kvm/70860-14/apicv-state Signed-off-by: Suravee Suthikulpanit --- arch/x86/kvm/debugfs.c | 22 ++++++++++++++++++++++ 1 file changed, 22 insertions(+) diff --git a/arch/x86/kvm/debugfs.c b/arch/x86/kvm/debugfs.c index d62852c..bd9fd25 100644 --- a/arch/x86/kvm/debugfs.c +++ b/arch/x86/kvm/debugfs.c @@ -48,8 +48,30 @@ static int vcpu_get_tsc_scaling_frac_bits(void *data, u6= 4 *val) =20 DEFINE_SIMPLE_ATTRIBUTE(vcpu_tsc_scaling_frac_fops, vcpu_get_tsc_scaling_f= rac_bits, NULL, "%llu\n"); =20 +static int kvm_get_apicv_state(void *data, u64 *val) +{ + struct kvm *kvm =3D (struct kvm *)data; + + mutex_lock(&kvm->arch.apicv_lock); + *val =3D kvm->arch.apicv_state; + mutex_unlock(&kvm->arch.apicv_lock); + return 0; +} + +DEFINE_SIMPLE_ATTRIBUTE(apicv_state_fops, kvm_get_apicv_state, NULL, "%llu= \n"); + int kvm_arch_create_vm_debugfs(struct kvm *kvm) { + struct dentry *ret; + + if (kvm_x86_ops->get_enable_apicv(kvm)) { + ret =3D debugfs_create_file("apicv-state", 0444, + kvm->debugfs_dentry, + kvm, &apicv_state_fops); + if (!ret) + return -ENOMEM; + } + return 0; } =20 --=20 1.8.3.1