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(static-72-81-132-2.bltmmd.fios.verizon.net [72.81.132.2]) by mx.zohomail.com with SMTPS id 165395041836510.052349096133753; Mon, 30 May 2022 15:40:18 -0700 (PDT) X-Outflank-Mailman: Message body and most headers restored to incoming version X-BeenThere: xen-devel@lists.xenproject.org List-Id: Xen developer discussion List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Errors-To: xen-devel-bounces@lists.xenproject.org Precedence: list Sender: "Xen-devel" X-Inumbo-ID: 8190b2a7-e069-11ec-bd2c-47488cf2e6aa ARC-Seal: i=1; a=rsa-sha256; t=1653950420; cv=none; d=zohomail.com; s=zohoarc; b=OcHcxNHbBQaLLq6H7Twbp6kwJsElx3wQQcGTWIhVXoSFZdGizJQVdR2oQqRq3l03F9CndUYg+V2YWMIjSxbMUgE9M0dMpjJEeJrS5D8Rjm3W9FcOSuUco8AIjpt7hIEnN6IfraiO5sQk7asy/G/uTxx3m+Lg6Tteze68xPJJHMY= ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=zohomail.com; s=zohoarc; t=1653950420; h=Content-Transfer-Encoding:Cc:Date:From:In-Reply-To:MIME-Version:Message-ID:References:Subject:To; bh=0S5/4L9LbrEvX7ep2X/hy4hvb0TSeot95E50192YMEs=; b=KDPXSkXlI9gzVbSWH2hTH/htLO0/8AUC7IKu7hVVaGov3exCSQEmAXWq3j6PBkAY0PwnfTDf9xDuixGUipwS9u4Ev4YWAYBTcMGqo/cMR1vw5vDQ7fhg6Ld8Ht+uFAaUUBUHbm/+u0vEGQk+37A5Hj6KVaaL+tAqCCW4sXICpVU= ARC-Authentication-Results: i=1; mx.zohomail.com; dkim=pass header.i=apertussolutions.com; spf=pass smtp.mailfrom=dpsmith@apertussolutions.com; dmarc=pass header.from= DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; t=1653950420; s=zoho; d=apertussolutions.com; i=dpsmith@apertussolutions.com; h=From:From:To:To:Cc:Cc:Subject:Subject:Date:Date:Message-Id:Message-Id:In-Reply-To:References:MIME-Version:Content-Transfer-Encoding:Reply-To; bh=0S5/4L9LbrEvX7ep2X/hy4hvb0TSeot95E50192YMEs=; b=JTk1CUoJBkxrhY0eIfzMeBlVKISWSxQkYOrSIssbJSXYb4jTKAybCYtXRtJTbVSp ExSF92bmXTGDq4wqZHflOTZPrXMGrQqysM+C2ty+siFe2gjnKq9A4G8bkN9zT1Ve999 tmr5bvOfgdu6Im1MG9NrSI8GvYVn/qRIwdvD6ZcM= From: "Daniel P. Smith" To: xen-devel@lists.xenproject.org, "Daniel P. Smith" Cc: scott.davis@starlab.io, christopher.clark@starlab.io, jandryuk@gmail.com, Daniel De Graaf Subject: [v2 1/3] xsm: only search for a policy file when needed Date: Mon, 30 May 2022 22:39:41 -0400 Message-Id: <20220531023945.22196-2-dpsmith@apertussolutions.com> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20220531023945.22196-1-dpsmith@apertussolutions.com> References: <20220531023945.22196-1-dpsmith@apertussolutions.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-ZohoMailClient: External X-ZohoMail-DKIM: pass (identity dpsmith@apertussolutions.com) X-ZM-MESSAGEID: 1653950465320100001 Content-Type: text/plain; charset="utf-8" It is possible to select a few different build configurations that results = in the unnecessary walking of the boot module list looking for a policy module. This specifically occurs when the flask policy is enabled but either the du= mmy or the SILO policy is selected as the enforcing policy. This is not ideal f= or configurations like hyperlaunch and dom0less when there could be a number of modules to be walked or doing an unnecessary device tree lookup. This patch introduces the policy_file_required flag for tracking when an XSM policy module requires a policy file. Only when the policy_file_required fl= ag is set to true, will XSM search the boot modules for a policy file. Signed-off-by: Daniel P. Smith --- xen/xsm/xsm_core.c | 16 ++++++++++++++-- 1 file changed, 14 insertions(+), 2 deletions(-) diff --git a/xen/xsm/xsm_core.c b/xen/xsm/xsm_core.c index 2286a502e3..4a29ee9558 100644 --- a/xen/xsm/xsm_core.c +++ b/xen/xsm/xsm_core.c @@ -55,19 +55,31 @@ static enum xsm_bootparam __initdata xsm_bootparam =3D XSM_BOOTPARAM_DUMMY; #endif =20 +static bool __initdata policy_file_required =3D + IS_ENABLED(CONFIG_XSM_FLASK_DEFAULT); + static int __init cf_check parse_xsm_param(const char *s) { int rc =3D 0; =20 if ( !strcmp(s, "dummy") ) + { xsm_bootparam =3D XSM_BOOTPARAM_DUMMY; + policy_file_required =3D false; + } #ifdef CONFIG_XSM_FLASK else if ( !strcmp(s, "flask") ) + { xsm_bootparam =3D XSM_BOOTPARAM_FLASK; + policy_file_required =3D true; + } #endif #ifdef CONFIG_XSM_SILO else if ( !strcmp(s, "silo") ) + { xsm_bootparam =3D XSM_BOOTPARAM_SILO; + policy_file_required =3D false; + } #endif else rc =3D -EINVAL; @@ -148,7 +160,7 @@ int __init xsm_multiboot_init( =20 printk("XSM Framework v" XSM_FRAMEWORK_VERSION " initialized\n"); =20 - if ( XSM_MAGIC ) + if ( policy_file_required && XSM_MAGIC ) { ret =3D xsm_multiboot_policy_init(module_map, mbi, &policy_buffer, &policy_size); @@ -176,7 +188,7 @@ int __init xsm_dt_init(void) =20 printk("XSM Framework v" XSM_FRAMEWORK_VERSION " initialized\n"); =20 - if ( XSM_MAGIC ) + if ( policy_file_required && XSM_MAGIC ) { ret =3D xsm_dt_policy_init(&policy_buffer, &policy_size); if ( ret ) --=20 2.20.1