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 lists.gnu.org (lists.gnu.org [209.51.188.17]) (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 90AFDCD5BCA for ; Thu, 5 Sep 2024 14:55:47 +0000 (UTC) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1smDsv-0000hI-9j; Thu, 05 Sep 2024 10:54:57 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1smDst-0000Yv-5A for qemu-devel@nongnu.org; Thu, 05 Sep 2024 10:54:55 -0400 Received: from dfw.source.kernel.org ([139.178.84.217]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1smDsr-0007FA-LB for qemu-devel@nongnu.org; Thu, 05 Sep 2024 10:54:54 -0400 Received: from smtp.kernel.org (transwarp.subspace.kernel.org [100.75.92.58]) by dfw.source.kernel.org (Postfix) with ESMTP id A6F755C5CC9; Thu, 5 Sep 2024 14:54:42 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id DD056C4CEC3; Thu, 5 Sep 2024 14:54:44 +0000 (UTC) Authentication-Results: smtp.kernel.org; dkim=pass (1024-bit key) header.d=zx2c4.com header.i=@zx2c4.com header.b="iOJ3Bxe5" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=zx2c4.com; s=20210105; t=1725548083; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=UbUvqUbTxXvSxmvdmKVvl8aODTaMQ8d9lp3BwWcHvCM=; b=iOJ3Bxe5eqok/NAXaNksuFqJ2cDdyc2uK/NuptUzWov9mi2BA9FYwvQzQJgm2IRE8TJ3X/ Bz5gEZVAOBA5Uft4TNmMNWxipkGl8HexQCCZPIH1cGH/kmlQFGP37IG8Pq8zpYBEZKXRc2 XuvF8wzz/IkMBIshSsXD//YubK4R9oU= Received: by mail.zx2c4.com (ZX2C4 Mail Server) with ESMTPSA id 61832bb4 (TLSv1.3:TLS_AES_256_GCM_SHA384:256:NO); Thu, 5 Sep 2024 14:54:43 +0000 (UTC) Date: Thu, 5 Sep 2024 16:54:41 +0200 From: "Jason A. Donenfeld" To: maobibo Cc: Thomas =?utf-8?Q?Wei=C3=9Fschuh?= , loongarch@lists.linux.dev, qemu-devel@nongnu.org, xry111@xry111.site Subject: Re: qemu direct kernel boot on LoongArch Message-ID: References: <1738d60a-df3a-4102-b1da-d16a29b6e06a@t-8ch.de> <49432aed-3ed7-2f07-7f65-311faef96197@loongson.cn> <95da2e9e-0905-ad61-6bf9-c2636f2cc5f1@loongson.cn> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: <95da2e9e-0905-ad61-6bf9-c2636f2cc5f1@loongson.cn> Received-SPF: pass client-ip=139.178.84.217; envelope-from=SRS0=ehJl=QD=zx2c4.com=Jason@kernel.org; helo=dfw.source.kernel.org X-Spam_score_int: -67 X-Spam_score: -6.8 X-Spam_bar: ------ X-Spam_report: (-6.8 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, HEADER_FROM_DIFFERENT_DOMAINS=0.25, RCVD_IN_DNSWL_HI=-5, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, T_SCC_BODY_TEXT_LINE=-0.01 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org On Thu, Sep 05, 2024 at 02:11:32PM +0800, maobibo wrote: > > > On 2024/9/5 下午1:25, Thomas Weißschuh wrote: > > On 2024-09-05 06:04:12+0000, Jason A. Donenfeld wrote: > >> On Thu, Sep 5, 2024 at 5:45 AM maobibo wrote: > >>> > >>> Jason, > >>> > >>> With the latest qemu 9.1 version, elf format booting is supported. > >> > >> Thanks, I just figured this out too, about 4 minutes ago. Excellent. > >> And the 1G minimum ram limit is gone too. > >> > >> Now working on how to trigger resets. > > > > With "reset" do you mean normal (non-panic) system shutdown/poweroff? > > Since QEMU 9.1 and a recent kernel you can use the pvpanic device for > > that in a cross-architecture way. > LoongArch uses acpi GED device to reboot machine. Now there is no FDT > table description and FDT driver for acpi GED device :( So you mean that QEMU exposes it via ACPI, but not via FDT, and the kernel doesn't know how to recognize it, even with ACPI?