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 E50F5CA5FED for ; Tue, 6 Oct 2026 10:22:11 +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-Type:MIME-Version: References:Message-ID:In-Reply-To:Subject:cc:To:From:Date:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=tvi6puQA0J0hA9rYePYBkk/sQ0USpeIPJk0WcZ47PBs=; b=k2IlmqvXHG3G7fAVM7TUVoi28Q 4QjtZRJbTbI6EMyPv1aHp/e5WbRm5dVFH3ivaB8Kr7N0XApcKIohA0UYsKX01p0P3EU6nYjyAnkiF oLEx2R3lyfSp3RDA7/1QJ4sNybtJiMTpBm8+1my30N0Xm53Tbw4gs4w1vVqv5c8Ve/eE2VySLUom4 OnkQcpWW24r7OGPg0wgxU8OG2BpdHMzG3uecsH1z+WpOmPMXxmY79xlwtw5jCLJg+ViIp4pf2oenK RBk0BX1655y9bQnvEPLXFwv4c2e5Y/lLdY+Z2k8Fs/JdM3yP74eCNvdVQlBNyoFlqnghfIVtSpQTb af3axGcg==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.99.1 #2 (Red Hat Linux)) id 1xE2JA-00000000UXr-24iH; Tue, 06 Oct 2026 10:22:05 +0000 Received: from sea.source.kernel.org ([2600:3c0a:e001:78e:0:1991:8:25]) by bombadil.infradead.org with esmtps (Exim 4.99.1 #2 (Red Hat Linux)) id 1xE2J9-00000000UXi-3ED3; Tue, 06 Oct 2026 10:22:03 +0000 Received: from smtp.kernel.org (quasi.space.kernel.org [100.103.45.18]) by sea.source.kernel.org (Postfix) with ESMTP id EF8D342E12; Tue, 6 Oct 2026 10:22:02 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 9CC6B1F000FF; Tue, 6 Oct 2026 10:21:55 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1791282122; bh=tvi6puQA0J0hA9rYePYBkk/sQ0USpeIPJk0WcZ47PBs=; h=Date:From:To:cc:Subject:In-Reply-To:References; b=J1U5RfrKVeP+O4jqaKDHgViRN05qb9EM9Ow1h1Wq3zq++FQwMjOceD42csp5T2HCP i4SQN58VQayxBkq/PLuKIXLU+KdLNU9LT0f6v3i5OyTx3dwvfYPKAgq1fvXfLrF0bM /QcMGDDxqEEv/AaEnXTMVA5Z2b19XuC+aLAR6Bnw9DJxQT36qn3BCzvnXP3mkPMC49 Rqi68kedr200C4HRCqsVLWgsyVU0VK6suF3v8YaykyMc4wf5GKLPSdbWX8zBA7gKqX HoBRJ3r01WmcEZLIAyF5w1Uzxv8mxRmPnxv1ODiOYAx/mqEnviAm2uzXFHPcXoI7yz qkeItwitvc/sA== Date: Tue, 6 Oct 2026 04:21:53 -0600 (MDT) From: Paul Walmsley To: Zhanpeng Zhang cc: Paul Walmsley , Palmer Dabbelt , Albert Ou , Alexandre Ghiti , Himanshu Chauhan , Conor Dooley , Anup Patel , =?ISO-8859-15?Q?Cl=E9ment_L=E9ger?= , Yunhui Cui , Atish Patra , Peter Zijlstra , Ingo Molnar , Arnaldo Carvalho de Melo , Namhyung Kim , Mark Rutland , Alexander Shishkin , Jiri Olsa , Ian Rogers , Adrian Hunter , James Clark , Will Deacon , Thomas Gleixner , Jonathan Corbet , Randy Dunlap , Shuah Khan , Shuah Khan , Yuanzhu , Yicong Yang , Susheng Yang , linux-riscv@lists.infradead.org, linux-kernel@vger.kernel.org, linux-perf-users@vger.kernel.org, linux-doc@vger.kernel.org, linux-kselftest@vger.kernel.org, linux-arm-kernel@lists.infradead.org Subject: Re: [PATCH v10 0/9] riscv: add SBI Supervisor Software Events support In-Reply-To: <20260911121456.33223-1-zhangzhanpeng.jasper@bytedance.com> Message-ID: <29e631f0-c135-bea4-0a3b-81dd715cef54@kernel.org> References: <20260911121456.33223-1-zhangzhanpeng.jasper@bytedance.com> MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII 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 Hi Zhanpeng Zhang, On Fri, 11 Sep 2026, Zhanpeng Zhang wrote: > RISC-V does not architecturally define a supervisor-mode non-maskable > interrupt (NMI). An interrupt that arrives while Linux has cleared SIE stays > pending and is not observed until interrupts are enabled again. That is > correct for ordinary interrupt handling, but some kernel work needs an > NMI-like notification that can run even inside an interrupt-disabled region: > sampling a PMU overflow at the instruction that caused it, or taking a > high-priority RAS report promptly, cannot wait for the next unmask boundary. > > The SBI Supervisor Software Events (SSE) extension [1] fills this gap. It lets > Linux register handlers for events that the SBI implementation can deliver > ahead of ordinary traps and interrupts, giving RISC-V the NMI-like supervisor > notification mechanism it otherwise lacks. Thanks for taking this series forward. Could you please rebase this series against the current riscv/for-next branch and repost? I tried pulling the series in, but it needs quite a few updates since we've queued up quite a few patches that touch SBI. thanks, - Paul