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mx.microsoft.com 1; spf=pass smtp.mailfrom=suse.com; dmarc=pass action=none header.from=suse.com; dkim=pass header.d=suse.com; arc=none From: Jin Nan Wang To: "xen-devel@lists.xenproject.org" Thread-Topic: [PATCH v4] Xen missing prompt log when exec-sp=off Thread-Index: AQHVtAnikBKl2+3ElEG70BBPpmH8nw== Date: Mon, 16 Dec 2019 12:11:01 +0000 Message-ID: <20191216121023.30237-1-jnwang@suse.com> Accept-Language: zh-CN, en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-clientproxiedby: SG2PR0401CA0011.apcprd04.prod.outlook.com (2603:1096:3:1::21) To BY5PR18MB3170.namprd18.prod.outlook.com (2603:10b6:a03:1a9::16) authentication-results: spf=none (sender IP is ) smtp.mailfrom=jnwang@suse.com; x-ms-exchange-messagesentrepresentingtype: 1 x-mailer: git-send-email 2.24.0 x-originating-ip: [45.122.156.254] x-ms-publictraffictype: Email x-ms-office365-filtering-correlation-id: fd94af22-f1ba-413e-705e-08d782210459 x-ms-traffictypediagnostic: BY5PR18MB3377: x-ms-exchange-transport-forked: True x-microsoft-antispam-prvs: x-ms-oob-tlc-oobclassifiers: OLM:6108; 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charset="utf-8" Content-Transfer-Encoding: quoted-printable Errors-To: xen-devel-bounces@lists.xenproject.org Sender: "Xen-devel" Fix a issue when user disable ETP exec-sp, xen missed a prompt log in dmesg. At default, xen will tell "VMX: Disabling executable EPT suerpages due to CVE-2018-12207". When user add 'ept=3Dexec-sp=3Doff' on command-line. The prompt is disappeared. This can give users the illusion that the feature is turned on. Signed-off-by: James Wang --- xen/arch/x86/hvm/vmx/vmx.c | 10 +++++----- 1 file changed, 5 insertions(+), 5 deletions(-) diff --git a/xen/arch/x86/hvm/vmx/vmx.c b/xen/arch/x86/hvm/vmx/vmx.c index 7970ba93e1..9dcb100210 100644 --- a/xen/arch/x86/hvm/vmx/vmx.c +++ b/xen/arch/x86/hvm/vmx/vmx.c @@ -2495,14 +2495,14 @@ const struct hvm_function_table * __init start_vmx(= void) { bool cpu_has_bug_pschange_mc =3D has_if_pschange_mc(); =20 + /* Default to non-executable superpages on vulnerable hardware. */ if ( opt_ept_exec_sp =3D=3D -1 ) - { - /* Default to non-executable superpages on vulnerable hardware= . */ opt_ept_exec_sp =3D !cpu_has_bug_pschange_mc; =20 - if ( cpu_has_bug_pschange_mc ) - printk("VMX: Disabling executable EPT superpages due to CV= E-2018-12207\n"); - } + if ( opt_ept_exec_sp ) + printk("VMX: Enable executable EPT superpages\n"); + else=20 + printk("VMX: Disabling executable EPT superpages due to CVE-20= 18-12207\n"); =20 vmx_function_table.hap_supported =3D 1; vmx_function_table.altp2m_supported =3D 1; --=20 2.24.0 _______________________________________________ Xen-devel mailing list Xen-devel@lists.xenproject.org https://lists.xenproject.org/mailman/listinfo/xen-devel