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[209.51.188.17]) by mx.google.com with ESMTPS id p4si10704850qke.280.2020.11.03.04.40.10 for (version=TLS1_2 cipher=ECDHE-ECDSA-CHACHA20-POLY1305 bits=256/256); Tue, 03 Nov 2020 04:40:10 -0800 (PST) Received-SPF: pass (google.com: domain of qemu-arm-bounces+alex.bennee=linaro.org@nongnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; Authentication-Results: mx.google.com; dkim=fail header.i=@redhat.com header.s=mimecast20190719 header.b=Ts3Ix3o3; spf=pass (google.com: domain of qemu-arm-bounces+alex.bennee=linaro.org@nongnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom="qemu-arm-bounces+alex.bennee=linaro.org@nongnu.org"; dmarc=fail (p=NONE sp=NONE dis=NONE) header.from=redhat.com Received: from localhost ([::1]:48090 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1kZvbe-0005bt-El for alex.bennee@linaro.org; Tue, 03 Nov 2020 07:40:10 -0500 Received: from eggs.gnu.org ([2001:470:142:3::10]:52052) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1kZvb3-0005af-Kd for qemu-arm@nongnu.org; Tue, 03 Nov 2020 07:39:33 -0500 Received: from us-smtp-delivery-124.mimecast.com ([63.128.21.124]:50656) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_CBC_SHA1:256) (Exim 4.90_1) (envelope-from ) id 1kZvb0-0006OM-NO for qemu-arm@nongnu.org; Tue, 03 Nov 2020 07:39:33 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1604407165; 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=UI6Y4+XlJlwrHvxocB3ncP7ba8NPybAEToiaJnoIIyI=; b=Ts3Ix3o3h8sV7RTCxennQ5YDR6aviviUMswXgDMyrv+5rs8PKBwbNzYbDkim8aXRi0iZCY aNvqkQTIy0QrE4saQAGGxZKp4zAQDKTguLfydcADuFVE3o/d9k8MCOQXuI8MDKQkKLcz/y kDd9K938EfEl7UJmrzCsLk/lpYJElCY= Received: from mimecast-mx01.redhat.com (mimecast-mx01.redhat.com [209.132.183.4]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-164-z2r4LVopP_-IEtFB6vhpUA-1; Tue, 03 Nov 2020 07:39:21 -0500 X-MC-Unique: z2r4LVopP_-IEtFB6vhpUA-1 Received: from smtp.corp.redhat.com (int-mx07.intmail.prod.int.phx2.redhat.com [10.5.11.22]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id 4245180364D; Tue, 3 Nov 2020 12:39:20 +0000 (UTC) Received: from localhost (unknown [10.40.208.69]) by smtp.corp.redhat.com (Postfix) with ESMTP id 3F47F1002D49; Tue, 3 Nov 2020 12:39:16 +0000 (UTC) Date: Tue, 3 Nov 2020 13:39:13 +0100 From: Igor Mammedov To: Ying Fang Subject: Re: Question on UEFI ACPI tables setup and probing on arm64 Message-ID: <20201103133913.1fee3337@redhat.com> In-Reply-To: References: MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.84 on 10.5.11.22 Authentication-Results: relay.mimecast.com; auth=pass smtp.auth=CUSA124A263 smtp.mailfrom=imammedo@redhat.com X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Received-SPF: pass client-ip=63.128.21.124; envelope-from=imammedo@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-detected-operating-system: by eggs.gnu.org: First seen = 2020/11/03 01:02:05 X-ACL-Warn: Detected OS = Linux 2.2.x-3.x [generic] [fuzzy] X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.001, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H5=0.001, RCVD_IN_MSPIKE_WL=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=unavailable autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-arm@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Peter Maydell , lersek@redhat.com, QEMU Developers , qemu-arm , "wangzhigang17@huawei.com" , philmd@redhat.com Errors-To: qemu-arm-bounces+alex.bennee=linaro.org@nongnu.org Sender: "Qemu-arm" X-TUID: MIPZMfTqXVoW On Fri, 30 Oct 2020 10:50:01 +0800 Ying Fang wrote: > Hi, > > I have a question on UEFI/ACPI tables setup and probing on arm64 platform. CCing Laszlo, who might know how it's implemented. > Currently on arm64 platform guest can be booted with both fdt and ACPI > supported. If ACPI is enabled, [1] says the only defined method for > passing ACPI tables to the kernel is via the UEFI system configuration > table. So AFAIK, ACPI Should be dependent on UEFI. > > What's more [2] says UEFI kernel support on the ARM architectures > is only available through a *stub*. The stub populates the FDT /chosen > node with some UEFI parameters describing the UEFI location info. > > So i dump /sys/firmware/fdt from the guest, it does have something like: > > /dts-v1/; > > / { > #size-cells = <0x02>; > #address-cells = <0x02>; > > chosen { > linux,uefi-mmap-desc-ver = <0x01>; > linux,uefi-mmap-desc-size = <0x30>; > linux,uefi-mmap-size = <0x810>; > linux,uefi-mmap-start = <0x04 0x3c0ce018>; > linux,uefi-system-table = <0x04 0x3f8b0018>; > bootargs = "BOOT_IMAGE=/vmlinuz-4.19.90-2003.4.0.0036.oe1.aarch64 > root=/dev/mapper/openeuler-root ro rd.lvm.lv=openeuler/root > rd.lvm.lv=openeuler/swap video=VGA-1:640x480-32@60me > smmu.bypassdev=0x1000:0x17 smmu.bypassdev=0x1000:0x15 > crashkernel=1024M,high video=efifb:off video=VGA-1:640x480-32@60me"; > linux,initrd-end = <0x04 0x3a85a5da>; > linux,initrd-start = <0x04 0x392f2000>; > }; > }; > > But the question is that I did not see any code adding the uefi > in fdt chosen node in *arm_load_dtb* or anywhere else. > Qemu only maps the OVMF binary file into a pflash device. > So I'm really confused on how UEFI information is provided to > guest by qemu. Does anybody know of the details about it ? > > [1] https://www.kernel.org/doc/html/latest/arm64/arm-acpi.html > [2] https://www.kernel.org/doc/Documentation/arm/uefi.rst > > Thanks. > Ying >