From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id F3D93C4332F for ; Thu, 3 Feb 2022 20:30:45 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S237784AbiBCUao (ORCPT ); Thu, 3 Feb 2022 15:30:44 -0500 Received: from dfw.source.kernel.org ([139.178.84.217]:35590 "EHLO dfw.source.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1354115AbiBCUaO (ORCPT ); Thu, 3 Feb 2022 15:30:14 -0500 Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by dfw.source.kernel.org (Postfix) with ESMTPS id 695F361A56; Thu, 3 Feb 2022 20:30:14 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 8C0C1C36AE3; Thu, 3 Feb 2022 20:30:12 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1643920213; bh=PKFm0sE3iMB94aMb4kUoSynBy19rolL5hhSmfs8lpww=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=aUNn9bLH8sYTQjGjLwWYClKYvCUIKOCMqtctHvBSrwIkdX+bwyqecCXcLJpiyA5Ww fdp5OKa4yFOSG1edrjyhDXtJKmIbjI7DwCd9rxlSx6BkM8/vnuJodPeDkUGb0mpHip iz80Wpl5mzrz2pnHYtFvl+cmEd8T7zZ4Ca6xt68P2orZaLq8AmdarJCzlVxgVG7pW9 OkqY9lzf5iGEkTOzRcuaT0AfWEwnZisujSh3q6L5/941Iwk49i55wuxvy98+/Vtg+k 8vdr7ghBCnW7OqunV6V9Zfs6NeTw//C7NIsIoicldBQa5M93NvpEzm0imSjp/XhvY2 0KWqd2rat0ZRA== From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Andi Kleen , Peter Zijlstra , Sasha Levin , mingo@redhat.com, acme@kernel.org, tglx@linutronix.de, bp@alien8.de, dave.hansen@linux.intel.com, x86@kernel.org, linux-perf-users@vger.kernel.org Subject: [PATCH AUTOSEL 5.16 16/52] x86/perf: Avoid warning for Arch LBR without XSAVE Date: Thu, 3 Feb 2022 15:29:10 -0500 Message-Id: <20220203202947.2304-16-sashal@kernel.org> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20220203202947.2304-1-sashal@kernel.org> References: <20220203202947.2304-1-sashal@kernel.org> MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-perf-users@vger.kernel.org From: Andi Kleen [ Upstream commit 8c16dc047b5dd8f7b3bf4584fa75733ea0dde7dc ] Some hypervisors support Arch LBR, but without the LBR XSAVE support. The current Arch LBR init code prints a warning when the xsave size (0) is unexpected. Avoid printing the warning for the "no LBR XSAVE" case. Signed-off-by: Andi Kleen Signed-off-by: Peter Zijlstra (Intel) Link: https://lkml.kernel.org/r/20211215204029.150686-1-ak@linux.intel.com Signed-off-by: Sasha Levin --- arch/x86/events/intel/lbr.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/arch/x86/events/intel/lbr.c b/arch/x86/events/intel/lbr.c index 8043213b75a52..fa947c4fbd1f8 100644 --- a/arch/x86/events/intel/lbr.c +++ b/arch/x86/events/intel/lbr.c @@ -1726,6 +1726,9 @@ static bool is_arch_lbr_xsave_available(void) * Check the LBR state with the corresponding software structure. * Disable LBR XSAVES support if the size doesn't match. */ + if (xfeature_size(XFEATURE_LBR) == 0) + return false; + if (WARN_ON(xfeature_size(XFEATURE_LBR) != get_lbr_state_size())) return false; -- 2.34.1