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 0EF8FC531C9 for ; Mon, 27 Jul 2026 16:35:39 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender: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:Cc: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=ryAq1M9VUrjc0+nFO0rpRdtGrI 9m/vzGa67HlyRTmK3UymaxqxXiPDmVkpikl+A+Eg/kHDdcufvSHZ/eXfJ7LJRqglaf8ladtFKznnE Lt23cU14JIG93UWY0gnWhsdoG4LKJflMH9VaTLKDQ/3NQmfRvJg5xEnXd807Tq9OVvQT9ouIHEUC0 kTwG1hbOl9ayOCJFiD1wWZb+h8npZcz9CnMR3yYQBt6ibN88jiyign7vBU67u94iBi5u95nPS2pyc XeS/BP2wxHuENJgsIohIIK0ZMO+CvBmhbHyebfS96/ohpQxeBrXimuHuATJzzliiRGTHhXJ4Ad6nr MFvmEXjQ==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.99.1 #2 (Red Hat Linux)) id 1woOIY-00000003MSQ-3OB1; Mon, 27 Jul 2026 16:35:26 +0000 Received: from foss.arm.com ([217.140.110.172]) by bombadil.infradead.org with esmtp (Exim 4.99.1 #2 (Red Hat Linux)) id 1woOIW-00000003MQc-1LmD for linux-arm-kernel@lists.infradead.org; Mon, 27 Jul 2026 16:35:25 +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 2CB0616F8; Mon, 27 Jul 2026 09:35:19 -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 4F0013F86F; Mon, 27 Jul 2026 09:35:22 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=simple/simple; d=arm.com; s=foss; t=1785170123; bh=PqYqA+Uka3hKnG3ofSUdRYEbe7o9p1qptfN/wL+TdJc=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=fdOKAeWYCdU0nD8AWd5fu0+BLuut8ILTCekwj4jKxfDN+yHAW4OtnPF9GrndDWDgP b/RlWel8e28Gni2hxZzLhSwLCJV/i+5710Sfu8lqjV/ztzffbgUENUEEaoyoNQteTU KKvNt+FMJVif1CziS32HKXwgxWVn9O4OXcqmPzLY= From: Vladimir Murzin To: linux-arm-kernel@lists.infradead.org Cc: mark.rutland@arm.com, maz@kernel.org, will@kernel.org, catalin.marinas@arm.com, ruanjinjie@huawei.com, liaochang1@huawei.com Subject: [RFC PATCH v2 02/45] arm64: debug: don't mask DAIF for mdscr_write() Date: Mon, 27 Jul 2026 17:34:10 +0100 Message-Id: <20260727163453.7969-3-vladimir.murzin@arm.com> X-Mailer: git-send-email 2.24.0 In-Reply-To: <20260727163453.7969-1-vladimir.murzin@arm.com> References: <20260727163453.7969-1-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-20260727_093524_419892_881AFA7E X-CRM114-Status: UNSURE ( 9.87 ) 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: , 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