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 bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id CCD45C44507 for ; Thu, 9 Jul 2026 12:14:16 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender:Cc:List-Subscribe: List-Help:List-Post:List-Archive:List-Unsubscribe:List-Id: Content-Transfer-Encoding:MIME-Version:References:In-Reply-To:Message-Id:Date :Subject:To:From:Reply-To:Content-Type:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=MCS9YBkYCw+URVZXcbcYXfVkyifcshj09WiHSyzQOPU=; b=krKjLw+nkDbUVR 36L3R3iwBiihjq2dNbjWL3lZtiJcyh7fortOe1zciVP13IaDnUaL9U8n1R1Uh8QslhFqH6zrlsWW2 diE4SSgmXBjil4RCQnHKch9Znn9mIREi6bYw4ZG9ELQy3VSTi6G9CAufvF0TULjBDiAdqf1FfxcvL BLj9oTAU1FCy48LmQm6y4F47zKuK9+LJw6Q8PqaaH+Q93mnwSk3VS+Fqc6HQNVI0z5rPrlNwgXMI8 FDINuIETYC9A1GgupAOIG5rA2I3PF5eApyHr+E1S+SBdxN5R8K1b1jqatnEEXeWB6CAYDINAsSvqA aprinEZS9pRlXQzU8PiA==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.99.1 #2 (Red Hat Linux)) id 1whndo-00000002KSg-11pB; Thu, 09 Jul 2026 12:14:08 +0000 Received: from desiato.infradead.org ([2001:8b0:10b:1:d65d:64ff:fe57:4e05]) by bombadil.infradead.org with esmtps (Exim 4.99.1 #2 (Red Hat Linux)) id 1whndm-00000002KPX-0hHC for linux-arm-kernel@bombadil.infradead.org; Thu, 09 Jul 2026 12:14:06 +0000 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=desiato.20200630; h=Content-Transfer-Encoding:MIME-Version :References:In-Reply-To:Message-Id:Date:Subject:Cc:To:From:Sender:Reply-To: Content-Type:Content-ID:Content-Description; bh=MCS9YBkYCw+URVZXcbcYXfVkyifcshj09WiHSyzQOPU=; b=SGDT9LUWF4fW4BjxL4nImowILr ioRcYUf/VeAZqudNyCLimTAY+YDsXsyRWKgNDjtIB28RD9WYWY76AnptOkPzZo1QwNO9U5t1nH2ot BS5X1GnqKxvrNuIFl7SQc7CfGAO3VtEJ9FpRbcVUdb6z8wCB+ktT1udNFFJTw+2lpiXaBcnK4CDY5 zdfzxNZKqJbbF2LHYm+h2FrjTA2Rb/5BA0qhO3sukS6+/tL3TcZvOSKRT6Aa6lxxFQQFI677j1MWt ToWCfIFCT9/HLYNWZ5C8IfnJoKtDKDdGPKHib0hWM079vR+zcoZQ1nyNqkvmqy0SpFn4kXKcIKNY7 HIaflJwA==; Received: from foss.arm.com ([217.140.110.172]) by desiato.infradead.org with esmtp (Exim 4.99.2 #2 (Red Hat Linux)) id 1whndf-00000009Bk2-37H8 for linux-arm-kernel@lists.infradead.org; Thu, 09 Jul 2026 12:14:03 +0000 Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.121.207.14]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id 0219D152B; Thu, 9 Jul 2026 05:13:53 -0700 (PDT) Received: from login2.euhpc2.arm.com (login2.euhpc2.arm.com [10.58.100.22]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPA id 236AE3F66F; Thu, 9 Jul 2026 05:13:56 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=simple/simple; d=arm.com; s=foss; t=1783599237; bh=PqYqA+Uka3hKnG3ofSUdRYEbe7o9p1qptfN/wL+TdJc=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=QTl1OqIWEUt6NKpl3GEMC2gx7taC6reqOdOdOBriwNPC4PL+e/i4YWScSquHz1rgj ZfJMRrTg8mIX4OA8cCO26OSyHbkcnKY5/iCjwPVse8FYwN5j8JE6J65c9krCJs03FV nxHDynh9UMQ3iERG+xqUobJgMI9Vdl5Ljw2BwbxI= From: Vladimir Murzin To: linux-arm-kernel@lists.infradead.org Subject: [RFC PATCH 02/36] arm64: debug: don't mask DAIF for mdscr_write() Date: Thu, 9 Jul 2026 13:12:59 +0100 Message-Id: <20260709121333.23507-3-vladimir.murzin@arm.com> X-Mailer: git-send-email 2.24.0 In-Reply-To: <20260709121333.23507-1-vladimir.murzin@arm.com> References: <20260709121333.23507-1-vladimir.murzin@arm.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.9.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20260709_131401_788936_278FF03E X-CRM114-Status: UNSURE ( 9.27 ) X-CRM114-Notice: Please train this message. X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: mark.rutland@arm.com, maz@kernel.org, ruanjinjie@huawei.com, catalin.marinas@arm.com, will@kernel.org Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org From: Ada Couprie Diaz Masking DAIF around the write to MDSCR_EL1 doesn't do anything: we can write to sysregs with interrupts unmasked, and writing to PSTATE is not a context synchronization event so it does not synchronize it. This is done in the context of a general interrupt handling cleanup, so it does not address the missing context synchronization for the MDSCR_EL1 write, staying consistent with the current state. This should be addressed in a future patch. Signed-off-by: Ada Couprie Diaz Signed-off-by: Vladimir Murzin --- arch/arm64/kernel/debug-monitors.c | 3 --- 1 file changed, 3 deletions(-) diff --git a/arch/arm64/kernel/debug-monitors.c b/arch/arm64/kernel/debug-monitors.c index 29307642f4c9..e271fbac5f82 100644 --- a/arch/arm64/kernel/debug-monitors.c +++ b/arch/arm64/kernel/debug-monitors.c @@ -40,10 +40,7 @@ u8 debug_monitors_arch(void) */ static void mdscr_write(u64 mdscr) { - unsigned long flags; - flags = local_daif_save(); write_sysreg(mdscr, mdscr_el1); - local_daif_restore(flags); } NOKPROBE_SYMBOL(mdscr_write); -- 2.34.1