From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mgamail.intel.com (mgamail.intel.com [192.198.163.11]) (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 F39A13CF211; Mon, 24 Aug 2026 08:34:41 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=192.198.163.11 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1787560483; cv=none; b=ow5a0AScGPkuZiiook8HOmlxCqn0JMGhrfoMRtn8fDzpUVx6tieAbQBdPythZc+MqgHkXibe30p/w1SA82NT2bbGkbnwvipLBd2vOR3UIPsmbNktS8pmWasEf/hMHiicI7pG6jdM2zxGi0lYs1ukgICMu4/nwgTDKfpE56DzMko= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1787560483; c=relaxed/simple; bh=VfW7PvtvPvI+U4KGhAdfHFi9quVPDdJyE9fvh0ueUnE=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=ey/Wo8ETNQNCWnoENpf9pwSHryBrpT5je890mUADtkteTnj0VrY0kGpnNWBexmk+jQ8gSLQezBjADBd4Gdbe1ldPCGxM/U0HYN3b/M7nODNERpX5JzGM0OF8AnSZvjViDDElq1VSOn49NjhGVWgSBubV5IoHS1QLv3aB/J0ZAp0= 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=ir6QWuBw; arc=none smtp.client-ip=192.198.163.11 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="ir6QWuBw" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1787560482; x=1819096482; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=VfW7PvtvPvI+U4KGhAdfHFi9quVPDdJyE9fvh0ueUnE=; b=ir6QWuBwuMVvfWx+vp1W/x6yk0Q3tKdrV6/6T1x4G93RCcdKqKY1/K+j gaiSTim8taBXltX6EIkWdcz8Q+g/N3P7YlWKkKMf5STkWTsJBbppvMlCx LIF/qdH0OUd1Jx8vkYGLU/urs//L29b6vLkAqesVw1q8rCY6OxGmXbEaJ GxsV83Df8yCWdvn7k/tVH5DfWisN8S0RQXnizg/ncpaDD2a2saHTgUzVH f7WmYx7uaVhFiyKRH1d3A9FzK5TfWBJTR21QIHPHMuWt19K8LQvJ20zDX xHB1HEP9SCuMGDoU6ChQ2PKiixGFpUMCebnfErS0z0v5j0DjNjLSceRDH w==; X-CSE-ConnectionGUID: igc3LiaKRu6QQyeZLZhvwA== X-CSE-MsgGUID: RgjC+2G6TECVCdadGgVShg== X-IronPort-AV: E=McAfee;i="6800,10657,11884"; a="98598743" X-IronPort-AV: E=Sophos;i="6.25,240,1779174000"; d="scan'208";a="98598743" Received: from fmviesa008.fm.intel.com ([10.60.135.148]) by fmvoesa105.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 24 Aug 2026 01:34:41 -0700 X-CSE-ConnectionGUID: 8ouAjhAZTyCsXVbj5eACrA== X-CSE-MsgGUID: tXZb/JNCQ9isT+LyRqjdGw== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.25,240,1779174000"; d="scan'208";a="264326131" Received: from spr.sh.intel.com ([10.112.229.196]) by fmviesa008.fm.intel.com with ESMTP; 24 Aug 2026 01:34:36 -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: [RESEND Patch v10 06/23] x86/fpu/xstate: Add xsaves_nmi() helper Date: Mon, 24 Aug 2026 16:27:14 +0800 Message-Id: <20260824082731.1013973-7-dapeng1.mi@linux.intel.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20260824082731.1013973-1-dapeng1.mi@linux.intel.com> References: <20260824082731.1013973-1-dapeng1.mi@linux.intel.com> Precedence: bulk X-Mailing-List: linux-kernel@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