From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mgamail.intel.com (mgamail.intel.com [192.198.163.16]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 7BCC1179A3; Tue, 21 Jul 2026 06:32:47 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=192.198.163.16 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1784615568; cv=none; b=H4f7OhfYDsSSydqxvY+o6bud/yAUPunHHgJpq07mkjK26el28QOgNIwXO6XiGcVz6Ea10oh0YciR6BqxkYhCHEFb+pVkX7+1CUB9YKhbi+WNfz/2pDMk3fk5FbHiFV4S1h6TVjU4ekhq71f/7Fpu/6vEv2i2Ga5GnfSC9pvYtCE= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1784615568; c=relaxed/simple; bh=VfW7PvtvPvI+U4KGhAdfHFi9quVPDdJyE9fvh0ueUnE=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=cIm9bHG92s62r/rEH1/iYAg3fXsIMZEZ1uv/o5IW0a52ln/zwbxzPsfk11YWZF++bvgasN0jHZFHT71u9T9JIL4q6/R7JPNY6CmjPF0uWcmPB1/Difzb4WPEM6EkbiPb7jflC/karxR3pc1jc2wvCWP3Z8O+ZAYU6qEigoIkDdU= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.intel.com; spf=pass smtp.mailfrom=linux.intel.com; dkim=pass (2048-bit key) header.d=intel.com header.i=@intel.com header.b=iSV5xR2t; arc=none smtp.client-ip=192.198.163.16 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.intel.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=linux.intel.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=intel.com header.i=@intel.com header.b="iSV5xR2t" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1784615567; x=1816151567; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=VfW7PvtvPvI+U4KGhAdfHFi9quVPDdJyE9fvh0ueUnE=; b=iSV5xR2t7tVz6XmW9PBpHmk1RX/yBq33FktrGlfKuHJtQMB/8uZjR1Bh 54qilBQi7LH8QlENu9YEV1jnoUKq9TT2hLugO9D887pKN2NwfyhxXLFZi T6GMd0BH2SUZqymSVHKXXjrD1ajy2qyQxHgdu8ZUPJdZu5xkVIB/EfhJy ZnQaQp52KuAVasp0dxg/JgMiz8RqEbH7E+sAvN22nBLfJkjdJd+OYa2AP KNqoTw/0zzK0SYe+7fmnypcGsY/n8qwcnYel4WtQH4sijsdkvauN+zjXO JmOCSpTAhhdjx56FxipG5vf+kEn0DP7mm5wPaO5ACy2DPjIJXk7YV1BAn w==; X-CSE-ConnectionGUID: BBiDq8ycQkKrhoAkeRcZjA== X-CSE-MsgGUID: x5zdxCJCR2u2nr4B+LqWFA== X-IronPort-AV: E=McAfee;i="6800,10657,11852"; a="72740324" X-IronPort-AV: E=Sophos;i="6.25,176,1779174000"; d="scan'208";a="72740324" Received: from fmviesa004.fm.intel.com ([10.60.135.144]) by fmvoesa110.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 20 Jul 2026 23:32:47 -0700 X-CSE-ConnectionGUID: yBOw8XeTTDas0ovOi+cH7A== X-CSE-MsgGUID: 2+8A9cJNRGCfoW3ZcbFqpg== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.25,176,1779174000"; d="scan'208";a="259655964" Received: from spr.sh.intel.com ([10.112.229.196]) by fmviesa004.fm.intel.com with ESMTP; 20 Jul 2026 23:32:39 -0700 From: Dapeng Mi To: Peter Zijlstra , Ingo Molnar , Arnaldo Carvalho de Melo , Namhyung Kim , Thomas Gleixner , Dave Hansen , Ian Rogers , Adrian Hunter , Jiri Olsa , Alexander Shishkin , Andi Kleen , Eranian Stephane Cc: Mark Rutland , broonie@kernel.org, Ravi Bangoria , linux-kernel@vger.kernel.org, linux-perf-users@vger.kernel.org, Zide Chen , Falcon Thomas , Dapeng Mi , Xudong Hao , Kan Liang , Dapeng Mi Subject: [Patch v10 06/23] x86/fpu/xstate: Add xsaves_nmi() helper Date: Tue, 21 Jul 2026 14:24:49 +0800 Message-Id: <20260721062506.3745816-7-dapeng1.mi@linux.intel.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20260721062506.3745816-1-dapeng1.mi@linux.intel.com> References: <20260721062506.3745816-1-dapeng1.mi@linux.intel.com> Precedence: bulk X-Mailing-List: linux-perf-users@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit From: Kan Liang Add xsaves_nmi() to save supported xsave states in NMI handler. This function is similar to xsaves(), but should only be called within the NMI handler. This function returns the actual register contents at the moment the NMI occurs. Currently the perf subsystem is the sole user of this helper. It uses this function to snapshot SIMD (XMM/YMM/ZMM) and APX eGPRs registers which would be added in subsequent patches. Signed-off-by: Kan Liang Signed-off-by: Dapeng Mi --- arch/x86/include/asm/fpu/xstate.h | 1 + arch/x86/kernel/fpu/xstate.c | 23 +++++++++++++++++++++++ 2 files changed, 24 insertions(+) diff --git a/arch/x86/include/asm/fpu/xstate.h b/arch/x86/include/asm/fpu/xstate.h index 7a7dc9d56027..38fa8ff26559 100644 --- a/arch/x86/include/asm/fpu/xstate.h +++ b/arch/x86/include/asm/fpu/xstate.h @@ -110,6 +110,7 @@ int xfeature_size(int xfeature_nr); void xsaves(struct xregs_state *xsave, u64 mask); void xrstors(struct xregs_state *xsave, u64 mask); +void xsaves_nmi(struct xregs_state *xsave, u64 mask); int xfd_enable_feature(u64 xfd_err); diff --git a/arch/x86/kernel/fpu/xstate.c b/arch/x86/kernel/fpu/xstate.c index a7b6524a9dea..d39c01546dee 100644 --- a/arch/x86/kernel/fpu/xstate.c +++ b/arch/x86/kernel/fpu/xstate.c @@ -1474,6 +1474,29 @@ void xrstors(struct xregs_state *xstate, u64 mask) WARN_ON_ONCE(err); } +/** + * xsaves_nmi - Save selected components to a kernel xstate buffer in NMI + * @xstate: Pointer to the buffer + * @mask: Feature mask to select the components to save + * + * This function is similar to xsaves(), but should only be called within + * the NMI handler. This function returns the actual register contents at + * the moment the NMI occurs. + * + * Currently, the perf subsystem is the sole user of this helper. It uses + * the function to snapshot SIMD (XMM/YMM/ZMM) and APX eGPRs registers. + */ +void xsaves_nmi(struct xregs_state *xstate, u64 mask) +{ + int err; + + if (!in_nmi()) + return; + + XSTATE_OP(XSAVES, xstate, (u32)mask, (u32)(mask >> 32), err); + WARN_ON_ONCE(err); +} + #if IS_ENABLED(CONFIG_KVM) void fpstate_clear_xstate_component(struct fpstate *fpstate, unsigned int xfeature) { -- 2.34.1