Received: by 2002:a05:6a10:206:0:0:0:0 with SMTP id 6csp2840600pxj; Sun, 23 May 2021 12:41:04 -0700 (PDT) X-Google-Smtp-Source: ABdhPJxEpDdyvp+ubU4v6bQwYo4nrMSH+6KbVs4PisavU7slsOlSggR4oc75mko3uAQwWWjLhafS X-Received: by 2002:a92:c94a:: with SMTP id i10mr12038218ilq.290.1621798864106; Sun, 23 May 2021 12:41:04 -0700 (PDT) ARC-Seal: i=1; a=rsa-sha256; t=1621798864; cv=none; d=google.com; s=arc-20160816; b=I33MWnEFJp3+5c6uIXuQmsqo5SCGgBy2pnNZPnQILyiN68V9s9FEOXXIH0/hMFD1kP ZvGpZdRML21gnqt0LBJcHGjVJe7uZ47qOJmazM8qqLHOlVMMpi7PgPei80uyNZjpTNdF 4KUM5k/0Y7C+cmTEgfLxyX6BSDF527/koH4neR8PfKConXbzbU4hgeF4MqcMUjfbC3qc g3sq54M5Gg9kjwhNQxU9XKTrY6HEnt4BSW8HpUE9iaDeN4096WZ4T7xERqTJUfTE6YlV E8w4pCnhwhi7Q75uDClT3FEXyKgsNxpQMWsdcGiAQbVCNPoaiqetVIVhdovJLH/g9PvL eoKg== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=list-id:precedence:references:in-reply-to:message-id:date:subject :cc:to:from:ironport-sdr:ironport-sdr; bh=GXmIQTFfLoue8V3C/DOdhpXkh95qBJZ2aKREJAdHNto=; b=nrQ6hQp2TLGgaTj2n5021U2Smz60EpPnSnPDO8lYZi7WpkExJWAUvFcjf7wgf3WWub TVCVDcpSuRZkDU304eC+sTlD4Uv2Qao76SiwG9+avZvz9HEzyqJga9CJkDSJc5iMKorn Hr8UkGuuIoFO47NoXmoffF8nceAmEOEMuSFuheL2HDGdDHO+CCWvpZrJBFL5z3gSyX92 87PwA4h+lTef/fbJoOlBv4LyvmfBuiF5QKjF5egD2577BUDoHLzc3fUvyYmw8KdBv7R3 /iL5EaYYq2U4blynv8KfffNVdHrLRwd/DVn5jr8CMKzHKniqFE0Rq554dyFi0Vt1HVQw kL3A== ARC-Authentication-Results: i=1; mx.google.com; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=fail (p=NONE sp=NONE dis=NONE) header.from=intel.com Return-Path: Received: from vger.kernel.org (vger.kernel.org. [23.128.96.18]) by mx.google.com with ESMTP id n16si10759530ioh.74.2021.05.23.12.40.51; Sun, 23 May 2021 12:41:04 -0700 (PDT) Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) client-ip=23.128.96.18; Authentication-Results: mx.google.com; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=fail (p=NONE sp=NONE dis=NONE) header.from=intel.com Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232397AbhEWTlP (ORCPT + 99 others); Sun, 23 May 2021 15:41:15 -0400 Received: from mga07.intel.com ([134.134.136.100]:12053 "EHLO mga07.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232008AbhEWTj6 (ORCPT ); Sun, 23 May 2021 15:39:58 -0400 IronPort-SDR: nkonRLIllWwntV5nkB6gZQuaQJPOncqD/ZGh+YD2jPugw1vDIdi9JyP2ojsu0aRanFxfiq7uuS pfqu1bQO9s8A== X-IronPort-AV: E=McAfee;i="6200,9189,9993"; a="265703542" X-IronPort-AV: E=Sophos;i="5.82,319,1613462400"; d="scan'208";a="265703542" Received: from fmsmga007.fm.intel.com ([10.253.24.52]) by orsmga105.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 23 May 2021 12:38:29 -0700 IronPort-SDR: tUM0pKVM27xRAXG8u26u4vbDMpLxX5nHr3zH2rBpsUUBTqZ1T1r9tSmXGdaWD+eHhprO4jumQM cs8FZV2+4b8g== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.82,319,1613462400"; d="scan'208";a="407467126" Received: from chang-linux-3.sc.intel.com ([172.25.66.175]) by fmsmga007.fm.intel.com with ESMTP; 23 May 2021 12:38:29 -0700 From: "Chang S. Bae" To: bp@suse.de, luto@kernel.org, tglx@linutronix.de, mingo@kernel.org, x86@kernel.org Cc: len.brown@intel.com, dave.hansen@intel.com, jing2.liu@intel.com, ravi.v.shankar@intel.com, linux-kernel@vger.kernel.org, chang.seok.bae@intel.com Subject: [PATCH v5 21/28] x86/fpu/amx: Initialize child's AMX state Date: Sun, 23 May 2021 12:32:52 -0700 Message-Id: <20210523193259.26200-22-chang.seok.bae@intel.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20210523193259.26200-1-chang.seok.bae@intel.com> References: <20210523193259.26200-1-chang.seok.bae@intel.com> Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Assure that a forked child starts AMX registers in the INIT-state. Signed-off-by: Chang S. Bae Reviewed-by: Len Brown Cc: x86@kernel.org Cc: linux-kernel@vger.kernel.org --- Changes from v4: * Added as a new patch. This was missing on previous versions. --- arch/x86/kernel/fpu/core.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/arch/x86/kernel/fpu/core.c b/arch/x86/kernel/fpu/core.c index 016c3adebec3..cccfeafe81e5 100644 --- a/arch/x86/kernel/fpu/core.c +++ b/arch/x86/kernel/fpu/core.c @@ -285,6 +285,10 @@ int fpu__copy(struct task_struct *dst, struct task_struct *src) fpregs_unlock(); + /* AMX state is volatile, children do not inherit it. */ + if (xfeatures_mask_all & XFEATURE_MASK_XTILE) + dst_fpu->state->xsave.header.xfeatures &= ~(XFEATURE_MASK_XTILE); + set_tsk_thread_flag(dst, TIF_NEED_FPU_LOAD); trace_x86_fpu_copy_src(src_fpu); -- 2.17.1