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bits=128/128); Mon, 13 Jan 2020 16:44:02 -0800 (PST) Subject: Re: [RFC PATCH qemu] spapr: Kill SLOF To: Andrea Bolognani , Daniel Henrique Barboza , qemu-devel@nongnu.org References: <20200103074404.30853-1-aik@ozlabs.ru> <3cf3e733-199a-61ba-7aaa-05e9546cd4d9@ozlabs.ru> <81f1f752-3ada-2c8d-38b7-1344c7633e14@ozlabs.ru> <5ed92e2a-4b9f-8092-cb67-8d94c3891e20@ozlabs.ru> <1a8f9121a3cb85d415ff1c67a5379a717ad2b8e0.camel@redhat.com> 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: Date: Tue, 14 Jan 2020 11:43:54 +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: <1a8f9121a3cb85d415ff1c67a5379a717ad2b8e0.camel@redhat.com> 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::444 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: Jose Ricardo Ziviani , Fabiano Rosas , Sam Bobroff , Michael Ellerman , Michael Roth , Nicholas Piggin , Paul Mackerras , qemu-ppc@nongnu.org, =?UTF-8?Q?Leonardo_Augusto_Guimar=c3=a3es_Garcia?= , Leonardo Bras , David Gibson Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" On 13/01/2020 20:13, Andrea Bolognani wrote: > On Wed, 2020-01-08 at 13:34 +1100, Alexey Kardashevskiy wrote: >> On 07/01/2020 20:39, Andrea Bolognani wrote: >>> On Tue, 2020-01-07 at 12:55 +1100, Alexey Kardashevskiy wrote: >>>> Petitboot kernel+initramdisk almost replaces SLOF + GRUB. >>> >>> Is this necessarily a good thing? >> >> The bare metal host and the powernv machine in QEMU do not use grub, >> they use petitboot which parses all grub configs and supports quite a lot. > > How well does the distro integration work? Eg. if I change something > in /etc/default/grub and then run grub2-mkconfig, can I expect my > changes to be picked up? Yes. Even the environment file (/boot/grub/grubenv). > In which scenarios will that *not* work? When/if grub adds a big new feature and petitboot won't have support for it. Otherwise everything from GRUB is supported today. >> Using Linux for a boot loader is not powerpc-only thing really, some >> folks do this too (forgot who, just heard this at the KVM forum). > > While other options are available and some architectures use > something else entirely, GRUB is the de-facto standard across most > of the non-obscure architectures. True. I am thinking of extending this patch to support GRUB as well. Or alternatively we could add a mode to GRUB to run in userspace under petitboot's kernel. It just seems quite an attractive idea to be able to boot from literally anything without needing a ROM on whatever device is passed through to the guest, or a driver in SLOF. > I guess the question is whether it's more important to be consistent > within the architecture or across them. I think the latter might be > preferable, especially when we consider what I think is the most > common scenario, that is, someone who's used to having GRUB on their > x86 machine running a ppc64 guest on the cloud. The more skills they > can automatically transfer over, the better. True. petitboot is not horribly different though, and the user has to take exact same steps as if it was GRUB. >>> Personally I quite like the fact >>> that I can use the same bootloader across x86, ppc64 and aarch64. >> >> I am not suggesting removing SLOF soon > > Perhaps the patch subject shouldn't be "kill SLOF" then? ;) This way I get more attention ;) -- Alexey