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 8BFBCC197BF for ; Thu, 27 Feb 2025 23:37:49 +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: Content-Type:In-Reply-To:From:References:To:Subject:Cc:MIME-Version:Date: Message-ID:Reply-To:Content-ID:Content-Description:Resent-Date:Resent-From: Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=6R/d69xIPnatoLajwtN5SPNB03Ui7q2MxXbR43k6h6A=; b=MO6vvZEk5DdYH2WZwPnpzHRj7g cjzVhSCPk40XDkJV1UffvSQgs5i/leJ1uBEH4vnao6b9qLqixu8rlCitGF1WMkngACM4BtB0J7Add afo4O0Dw0+YYCp6w7tqCGMVgUmr4yTUK9sNInix/trfZTDWydajpNf7KVaTRqPczZtG3wWmy3R+/b rT9iq/JgdFfot5FdW8fyfASnZ5idpbn1j+b28/ouQpiF0YJUfh/qRRjrjzmXu4JS/8nMT9aMff2zp I98cOqcD3DQDMO0G2/wulNA6wYw979h/S77O+9s71bPKs1ubjBbHV1Gdqn21oAnLTmjXoFaFcJ/JN z9tf2Gmg==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.98 #2 (Red Hat Linux)) id 1tnnRm-00000009Bw3-1MSa; Thu, 27 Feb 2025 23:37:42 +0000 Received: from linux.microsoft.com ([13.77.154.182]) by bombadil.infradead.org with esmtp (Exim 4.98 #2 (Red Hat Linux)) id 1tnnFo-00000009ARl-10XC for linux-arm-kernel@lists.infradead.org; Thu, 27 Feb 2025 23:25:21 +0000 Received: from [192.168.35.166] (c-24-22-154-137.hsd1.wa.comcast.net [24.22.154.137]) by linux.microsoft.com (Postfix) with ESMTPSA id A30CA210EAC0; Thu, 27 Feb 2025 15:25:18 -0800 (PST) DKIM-Filter: OpenDKIM Filter v2.11.0 linux.microsoft.com A30CA210EAC0 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux.microsoft.com; s=default; t=1740698719; bh=6R/d69xIPnatoLajwtN5SPNB03Ui7q2MxXbR43k6h6A=; h=Date:Cc:Subject:To:References:From:In-Reply-To:From; b=nUZ5Sq2woTZNa8bIOcVxHVzfj8fnmzJRFv8NcRJhxl7FGKh1FFsM5eMjQkaoK7hz7 3M2gjH6gsVfCr3K1Q2F3CZ5tmXjF7N557dC2trMTS+9aTnpNsCkirzR640o1v4r9nb qoy7McOe2AL7Peg/quv8CSv5fL/iZfV0ryBMdo5s= Message-ID: <70b62e52-639a-4026-9a52-102d1de46ffd@linux.microsoft.com> Date: Thu, 27 Feb 2025 15:25:17 -0800 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Cc: eahariha@linux.microsoft.com, Nuno Das Neves , linux-hyperv@vger.kernel.org, x86@kernel.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, linux-arch@vger.kernel.org, linux-acpi@vger.kernel.org, kys@microsoft.com, haiyangz@microsoft.com, wei.liu@kernel.org, mhklinux@outlook.com, decui@microsoft.com, catalin.marinas@arm.com, will@kernel.org, tglx@linutronix.de, mingo@redhat.com, bp@alien8.de, dave.hansen@linux.intel.com, hpa@zytor.com, daniel.lezcano@linaro.org, joro@8bytes.org, robin.murphy@arm.com, arnd@arndb.de, jinankjain@linux.microsoft.com, muminulrussell@gmail.com, skinsburskii@linux.microsoft.com, mrathor@linux.microsoft.com, ssengar@linux.microsoft.com, apais@linux.microsoft.com, Tianyu.Lan@microsoft.com, stanislav.kinsburskiy@gmail.com, gregkh@linuxfoundation.org, vkuznets@redhat.com, prapal@linux.microsoft.com, muislam@microsoft.com, anrayabh@linux.microsoft.com, rafael@kernel.org, lenb@kernel.org, corbet@lwn.net Subject: Re: [PATCH v5 01/10] hyperv: Convert Hyper-V status codes to strings To: Roman Kisel References: <1740611284-27506-1-git-send-email-nunodasneves@linux.microsoft.com> <1740611284-27506-2-git-send-email-nunodasneves@linux.microsoft.com> <74af19c4-639f-4bcc-b667-b5f102bbb312@linux.microsoft.com> <8338dd00-3aa4-418f-a547-1c19623358cb@linux.microsoft.com> <49a69fe3-fca5-426d-999d-61ee0c8f60f3@linux.microsoft.com> From: Easwar Hariharan Content-Language: en-US In-Reply-To: <49a69fe3-fca5-426d-999d-61ee0c8f60f3@linux.microsoft.com> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20250227_152520_385031_DBA2A534 X-CRM114-Status: GOOD ( 16.69 ) 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 On 2/27/2025 3:08 PM, Roman Kisel wrote: > > > On 2/27/2025 2:54 PM, Easwar Hariharan wrote: > [...] > >> >> Sorry, I have to disagree with this, a recent commit of mine[1] closed a WSL >> issue that was open for over 2 years for, partly, the utter uselessness of >> the hex return code of the hypercall. > > Thanks for your efforts, and sorry to hear you had a frustrating > debugging experience (sounds like it). TBF, I didn't personally struggle with it for 2 years, IMHO, it was the opaqueness of what the value meant that contributed to user pain. > > Would be great to learn the details to understand how this function is > going to improve the situation: > > 1. How come the hex error code was useless, what is not matching >    anything in the Linux headers? It doesn't match anything in the Linux headers, but it's an NTSTATUS, not HVSTATUS. Coming from the PoV of a user, it would be a much more useful message to see: [ 249.512760] hv_storvsc fd1d2cbd-ce7c-535c-966b-eb5f811c95f0: tag#683 cmd 0x28 status: scsi 0x2 srb 0x4 hv STATUS_UNSUCCESSFUL than [ 249.512760] hv_storvsc fd1d2cbd-ce7c-535c-966b-eb5f811c95f0: tag#683 cmd 0x28 status: scsi 0x2 srb 0x4 hv 0xc0000001 > 2. How having "Unknown" in the log can possibly be better? IMHO, seeing "Unknown" in an error report means that there's a new return value that needs to be mapped to errno in hv_status_to_errno() and updated here as well. > 3. Given that the select hv status codes and the proposed strings have >    1:1 correspondence, and there is the 1:N catch-all case for the >    "Unknown", how's that better? > I didn't really follow this question, but I suppose the answer to Q2 answers this as well. If not, please expand and I'll try to answer. Thanks, Easwar (he/him)