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z4sm10192066pfn.42.2020.02.09.16.31.35 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Sun, 09 Feb 2020 16:31:37 -0800 (PST) Subject: Re: VW ELF loader To: Paolo Bonzini , David Gibson References: <20200203012842.GD52446@umbus.fritz.box> <8420784f-b4c7-9864-8534-b94dbc5f74ff@redhat.com> <20200205055851.GH60221@umbus.fritz.box> <73105e0b-c0a0-009f-aeba-fec818d3088c@redhat.com> <23090d06-320e-91b5-f73e-c17e065fcad8@ozlabs.ru> From: Alexey Kardashevskiy Autocrypt: addr=aik@ozlabs.ru; keydata= mQINBE+rT0sBEADFEI2UtPRsLLvnRf+tI9nA8T91+jDK3NLkqV+2DKHkTGPP5qzDZpRSH6mD EePO1JqpVuIow/wGud9xaPA5uvuVgRS1q7RU8otD+7VLDFzPRiRE4Jfr2CW89Ox6BF+q5ZPV /pS4v4G9eOrw1v09lEKHB9WtiBVhhxKK1LnUjPEH3ifkOkgW7jFfoYgTdtB3XaXVgYnNPDFo PTBYsJy+wr89XfyHr2Ev7BB3Xaf7qICXdBF8MEVY8t/UFsesg4wFWOuzCfqxFmKEaPDZlTuR tfLAeVpslNfWCi5ybPlowLx6KJqOsI9R2a9o4qRXWGP7IwiMRAC3iiPyk9cknt8ee6EUIxI6 t847eFaVKI/6WcxhszI0R6Cj+N4y+1rHfkGWYWupCiHwj9DjILW9iEAncVgQmkNPpUsZECLT 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XrB5p+6ML7Bd84xOEGsj/vdaXmz1esuH7BOZAGEZfLRCHJ0GVCSssg== Message-ID: <274037e5-9bd5-8507-4b4b-067a86225787@ozlabs.ru> Date: Mon, 10 Feb 2020 11:31:33 +1100 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.3.0 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit X-detected-operating-system: by eggs.gnu.org: Genre and OS details not recognized. X-Received-From: 2607:f8b0:4864:20::642 X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Christian Borntraeger , Thomas Huth , "qemu-devel@nongnu.org" , Cornelia Huck , Stefano Garzarella Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" On 07/02/2020 10:46, Paolo Bonzini wrote: > On 07/02/20 00:23, Alexey Kardashevskiy wrote: >>> Right, not unlike what you get with vof=on. :) I'm not against at all >>> that idea. I just don't understand what you refer to below as (2). >>> Does petitboot not have the problem because it kexecs the new kernel? >> >> Petitboot does not have this problem *if* it runs without SLOF, i.e. >> directly via -kernel and -initrd and uses OF CI (cut down version, about >> v3-v4 of my patchset, without block devices and grub lookup). In this >> case there is one device tree instance, fully synchronized with the >> machine state. >> >> If there is still SLOF and (2) is happening, then petitboot is screwed >> as any other kernel. > > Ok, so "minimal pseudo-OpenFirmware in QEMU" is doable and can get > everything right; I am not convinced that ditching drivers is not right; I am moving elf + mbr + gpt + grub loading to the guest though so 20 bytes blob becomes FDT-less firmmare, a few kbytes big. > it's just work to set up PCI and do all that other > do_driver_stuff(), so you can either do it yourself or use > Linux+petitboot. Is this correct? Except using the "just" word, yes, correct ;) > Also, can a normal distro kernel run via -kernel/-initrd + the minimal > firmware in QEMU? Yes. -- Alexey