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[2620:137:e000::3:4]) by mx.google.com with ESMTPS id v127-20020a632f85000000b0055c8d58cee9si1651354pgv.714.2023.09.14.09.04.45 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 14 Sep 2023 09:04:46 -0700 (PDT) Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::3:4 as permitted sender) client-ip=2620:137:e000::3:4; Authentication-Results: mx.google.com; dkim=pass header.i=@intel.com header.s=Intel header.b=Q+uN2PFZ; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::3:4 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=intel.com Received: from out1.vger.email (depot.vger.email [IPv6:2620:137:e000::3:0]) by howler.vger.email (Postfix) with ESMTP id A5F0D852D248; Thu, 14 Sep 2023 02:38:51 -0700 (PDT) X-Virus-Status: Clean X-Virus-Scanned: clamav-milter 0.103.10 at howler.vger.email Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S237578AbjINJil (ORCPT + 35 others); Thu, 14 Sep 2023 05:38:41 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:40142 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S236923AbjINJiV (ORCPT ); Thu, 14 Sep 2023 05:38:21 -0400 Received: from mgamail.intel.com (mgamail.intel.com [192.55.52.88]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id B73C71BEF; Thu, 14 Sep 2023 02:38:17 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1694684297; x=1726220297; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=7cLERNq1vvTBAZ52sQIMEUGAduSmp4Knqxddo4MpnMo=; b=Q+uN2PFZ/YM49u3guS8f3wncn9EMDc7BCIpgsnE3evehRTkaNepQ0zmH f34zdTgtYxzFtHv0Y8T/GWvGSGVvT1ovgPoFXVGY7HKxPjLcFbKcWRlUu tlMNJmrTcUHfY0puW2k6Y4jM/8S8eMWY0pXt0zdnQBCatoS34nrrOYrIF uIEw3SNKvIWYDdfR9soCrRlXnG8s9jjsP3FBJshzRgyrPnOt7I6DTlhg2 VgvkKTwUyJyFcCULM6MwzlZtLhBgxMwf/9UYgkFWlc2klZ4HJ7eMl53qv nXzxhvtgedBuLfp3zWc3vxYCstuTlemyS6flDUf5W8HAjC6Ap+dijOrAG Q==; X-IronPort-AV: E=McAfee;i="6600,9927,10832"; a="409857328" X-IronPort-AV: E=Sophos;i="6.02,145,1688454000"; d="scan'208";a="409857328" Received: from fmsmga007.fm.intel.com ([10.253.24.52]) by fmsmga101.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 14 Sep 2023 02:38:17 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=McAfee;i="6600,9927,10832"; a="747656226" X-IronPort-AV: E=Sophos;i="6.02,145,1688454000"; d="scan'208";a="747656226" Received: from embargo.jf.intel.com ([10.165.9.183]) by fmsmga007-auth.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 14 Sep 2023 02:38:16 -0700 From: Yang Weijiang To: seanjc@google.com, pbonzini@redhat.com, kvm@vger.kernel.org, linux-kernel@vger.kernel.org Cc: dave.hansen@intel.com, peterz@infradead.org, chao.gao@intel.com, rick.p.edgecombe@intel.com, weijiang.yang@intel.com, john.allen@amd.com Subject: [PATCH v6 05/25] x86/fpu/xstate: Remove kernel dynamic xfeatures from kernel default_features Date: Thu, 14 Sep 2023 02:33:05 -0400 Message-Id: <20230914063325.85503-6-weijiang.yang@intel.com> X-Mailer: git-send-email 2.27.0 In-Reply-To: <20230914063325.85503-1-weijiang.yang@intel.com> References: <20230914063325.85503-1-weijiang.yang@intel.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org X-Greylist: Sender passed SPF test, not delayed by milter-greylist-4.6.4 (howler.vger.email [0.0.0.0]); Thu, 14 Sep 2023 02:38:51 -0700 (PDT) X-getmail-retrieved-from-mailbox: INBOX X-GMAIL-THRID: 1777029597730150302 X-GMAIL-MSGID: 1777029597730150302 The kernel dynamic xfeatures are supported by host, i.e., they're enabled in xsaves/xrstors operating xfeature set (XCR0 | XSS), but the corresponding CPU features are disabled for the time-being in host kernel so the bits are not necessarily set by default. Remove the bits from fpu_kernel_cfg.default_features so that the bits in xstate_bv and xcomp_bv are cleared and xsaves/xrstors can be optimized by HW for normal fpstate. Signed-off-by: Yang Weijiang --- arch/x86/kernel/fpu/xstate.c | 1 + 1 file changed, 1 insertion(+) diff --git a/arch/x86/kernel/fpu/xstate.c b/arch/x86/kernel/fpu/xstate.c index eaec05bc1b3c..4753c677e2e1 100644 --- a/arch/x86/kernel/fpu/xstate.c +++ b/arch/x86/kernel/fpu/xstate.c @@ -845,6 +845,7 @@ void __init fpu__init_system_xstate(unsigned int legacy_size) /* Clean out dynamic features from default */ fpu_kernel_cfg.default_features = fpu_kernel_cfg.max_features; fpu_kernel_cfg.default_features &= ~XFEATURE_MASK_USER_DYNAMIC; + fpu_kernel_cfg.default_features &= ~fpu_kernel_dynamic_xfeatures; fpu_user_cfg.default_features = fpu_user_cfg.max_features; fpu_user_cfg.default_features &= ~XFEATURE_MASK_USER_DYNAMIC;