From: Ard Biesheuvel <ard.biesheuvel-QSEj5FYQhm4dnm+yROfE0A@public.gmane.org> To: Ian Campbell <ian.campbell-Sxgqhf6Nn4DQT0dZR+AlfA@public.gmane.org> Cc: Mark Rutland <mark.rutland-5wv7dgnIgG8@public.gmane.org>, Daniel Kiper <daniel.kiper-QHcLZuEGTsvQT0dZR+AlfA@public.gmane.org>, "linux-efi-u79uwXL29TY76Z2rM5mHXA@public.gmane.org" <linux-efi-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>, Konrad Rzeszutek Wilk <konrad.wilk-QHcLZuEGTsvQT0dZR+AlfA@public.gmane.org>, Stefano Stabellini <stefano.stabellini-mvvWK6WmYclDPfheJLI6IQ@public.gmane.org>, "leif.lindholm-QSEj5FYQhm4dnm+yROfE0A@public.gmane.org" <leif.lindholm-QSEj5FYQhm4dnm+yROfE0A@public.gmane.org>, "xen-devel-GuqFBffKawuEi8DpZVb4nw@public.gmane.org" <xen-devel-GuqFBffKawuEi8DpZVb4nw@public.gmane.org>, "matt.fleming-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org" <matt.fleming-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org>, "christoffer.dall-QSEj5FYQhm4dnm+yROfE0A@public.gmane.org" <christoffer.dall-QSEj5FYQhm4dnm+yROfE0A@public.gmane.org>, "jbeulich-IBi9RG/b67k@public.gmane.org" <jbeulich-IBi9RG/b67k@public.gmane.org>, Shannon Zhao <zhaoshenglong-hv44wF8Li93QT0dZR+AlfA@public.gmane.org>, "julien.grall-Sxgqhf6Nn4DQT0dZR+AlfA@public.gmane.org" <julien.grall-Sxgqhf6Nn4DQT0dZR+AlfA@public.gmane.org>, "peter.huangpeng-hv44wF8Li93QT0dZR+AlfA@public.gmane.org" <peter.huangpeng-hv44wF8Li93QT0dZR+AlfA@public.gmane.org>, "linux-arm-kernel-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org" <linux-arm-kernel-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org>, "shannon.zhao-QSEj5FYQhm4dnm+yROfE0A@public.gmane.org" <shannon.zhao-QSEj5FYQhm4dnm+yROfE0A@public.gmane.org> Subject: Re: [PATCH] efi/libstub/fdt: Standardize the names of EFI stub parameters Date: Mon, 14 Sep 2015 12:02:24 +0200 [thread overview] Message-ID: <CAKv+Gu_Gh649EwdtodLY9Q28JhqYg8o6RShXXH1ZbxsfYRfi2Q@mail.gmail.com> (raw) In-Reply-To: <1442224673.3549.131.camel-Sxgqhf6Nn4DQT0dZR+AlfA@public.gmane.org> On 14 September 2015 at 11:57, Ian Campbell <ian.campbell-Sxgqhf6Nn4DQT0dZR+AlfA@public.gmane.org> wrote: > On Mon, 2015-09-14 at 11:43 +0200, Ard Biesheuvel wrote: > >> Xen will not boot the kernel via the stub, but directly. It needs to >> supply a EFI like environment so that the kernel can boot via ACPI. >> There is no reason whatsoever to mock up boot services or other pieces >> of UEFI functionality that are not needed. > > I'm correct that on native the EFI stub calls ExitBootServices, right? > > So the flow for native is: > > EFI -> Linux EFI Stub -> Exit Boot Services -> Non-EFI Linux head.S entrypoint > > For Xen it is more like: > > Xen domain builder ------- ... ... ------> Non-EFI Linux head.S entrypoint > >> The core kernel does not call any boot services > > And it cannot because ExitBootServices has already been called. > > I think given all that there should no reason at all for Xen to be > providing boot services. > Indeed. >> or SetVirtualAddressMap/ConvertPointer, and > > These two are RTS, so in principal it could. > > (I'm not sure about ConvertPointer, is it useful for OS kernels, or just > for "UEFI components" mentioned at http://wiki.phoenix.com/wiki/index.php/E > FI_RUNTIME_SERVICES#ConvertPointer.28.29 ?) > No, there is no point. The stub calls SetVirtualAddressMap, so the kernel proper can never call it, since it can only be called once. ConvertPointer has little utility outside of the UEFI runtime components that are invoked during SetVirtualAddressMap, so I don't see a reason to supply that either. -- Ard.
WARNING: multiple messages have this Message-ID (diff)
From: ard.biesheuvel@linaro.org (Ard Biesheuvel) To: linux-arm-kernel@lists.infradead.org Subject: [PATCH] efi/libstub/fdt: Standardize the names of EFI stub parameters Date: Mon, 14 Sep 2015 12:02:24 +0200 [thread overview] Message-ID: <CAKv+Gu_Gh649EwdtodLY9Q28JhqYg8o6RShXXH1ZbxsfYRfi2Q@mail.gmail.com> (raw) In-Reply-To: <1442224673.3549.131.camel@citrix.com> On 14 September 2015 at 11:57, Ian Campbell <ian.campbell@citrix.com> wrote: > On Mon, 2015-09-14 at 11:43 +0200, Ard Biesheuvel wrote: > >> Xen will not boot the kernel via the stub, but directly. It needs to >> supply a EFI like environment so that the kernel can boot via ACPI. >> There is no reason whatsoever to mock up boot services or other pieces >> of UEFI functionality that are not needed. > > I'm correct that on native the EFI stub calls ExitBootServices, right? > > So the flow for native is: > > EFI -> Linux EFI Stub -> Exit Boot Services -> Non-EFI Linux head.S entrypoint > > For Xen it is more like: > > Xen domain builder ------- ... ... ------> Non-EFI Linux head.S entrypoint > >> The core kernel does not call any boot services > > And it cannot because ExitBootServices has already been called. > > I think given all that there should no reason at all for Xen to be > providing boot services. > Indeed. >> or SetVirtualAddressMap/ConvertPointer, and > > These two are RTS, so in principal it could. > > (I'm not sure about ConvertPointer, is it useful for OS kernels, or just > for "UEFI components" mentioned at http://wiki.phoenix.com/wiki/index.php/E > FI_RUNTIME_SERVICES#ConvertPointer.28.29 ?) > No, there is no point. The stub calls SetVirtualAddressMap, so the kernel proper can never call it, since it can only be called once. ConvertPointer has little utility outside of the UEFI runtime components that are invoked during SetVirtualAddressMap, so I don't see a reason to supply that either. -- Ard.
next prev parent reply other threads:[~2015-09-14 10:02 UTC|newest] Thread overview: 182+ messages / expand[flat|nested] mbox.gz Atom feed top 2015-09-10 8:41 [PATCH] efi/libstub/fdt: Standardize the names of EFI stub parameters Shannon Zhao 2015-09-10 8:41 ` Shannon Zhao 2015-09-10 8:41 ` Shannon Zhao 2015-09-10 9:52 ` Mark Rutland 2015-09-10 9:52 ` Mark Rutland 2015-09-10 9:52 ` Mark Rutland 2015-09-10 10:19 ` Stefano Stabellini 2015-09-10 10:19 ` Stefano Stabellini 2015-09-10 10:19 ` Stefano Stabellini 2015-09-10 10:19 ` Stefano Stabellini 2015-09-10 11:24 ` Mark Rutland 2015-09-10 11:24 ` Mark Rutland 2015-09-10 11:24 ` Mark Rutland 2015-09-10 11:37 ` Stefano Stabellini 2015-09-10 11:37 ` Stefano Stabellini 2015-09-10 11:37 ` Stefano Stabellini 2015-09-10 11:37 ` Stefano Stabellini 2015-09-10 12:15 ` Mark Rutland 2015-09-10 12:15 ` Mark Rutland 2015-09-10 12:15 ` Mark Rutland 2015-09-10 12:15 ` Mark Rutland 2015-09-10 12:58 ` [Xen-devel] " Ian Campbell 2015-09-10 12:58 ` Ian Campbell 2015-09-10 12:58 ` Ian Campbell 2015-09-10 13:08 ` Jan Beulich 2015-09-10 13:08 ` [Xen-devel] " Jan Beulich 2015-09-10 13:08 ` Jan Beulich 2015-09-10 13:08 ` Jan Beulich 2015-09-10 13:30 ` Ian Campbell 2015-09-10 13:30 ` Ian Campbell 2015-09-10 13:30 ` Ian Campbell 2015-09-10 13:30 ` Ian Campbell 2015-09-10 12:58 ` Ian Campbell 2015-09-10 13:52 ` Stefano Stabellini 2015-09-10 13:52 ` Stefano Stabellini 2015-09-10 13:52 ` Stefano Stabellini 2015-09-10 14:13 ` Leif Lindholm 2015-09-10 14:13 ` Leif Lindholm 2015-09-10 14:13 ` Leif Lindholm 2015-09-10 14:13 ` Leif Lindholm 2015-09-10 14:49 ` Mark Rutland 2015-09-10 14:49 ` Mark Rutland 2015-09-10 14:49 ` Mark Rutland 2015-09-10 14:49 ` Mark Rutland 2015-09-10 16:10 ` Stefano Stabellini 2015-09-10 16:10 ` Stefano Stabellini 2015-09-10 16:10 ` Stefano Stabellini 2015-09-10 16:23 ` Mark Rutland 2015-09-10 16:23 ` Mark Rutland 2015-09-10 16:23 ` Mark Rutland 2015-09-11 12:46 ` Daniel Kiper 2015-09-11 12:46 ` Daniel Kiper 2015-09-11 12:46 ` Daniel Kiper 2015-09-11 12:46 ` Daniel Kiper 2015-09-11 13:14 ` Stefano Stabellini 2015-09-11 13:14 ` Stefano Stabellini 2015-09-11 13:14 ` Stefano Stabellini 2015-09-11 13:14 ` Stefano Stabellini 2015-09-11 13:30 ` Ard Biesheuvel 2015-09-11 13:30 ` Ard Biesheuvel 2015-09-11 13:30 ` Ard Biesheuvel 2015-09-11 13:30 ` Ard Biesheuvel 2015-09-11 15:45 ` Daniel Kiper 2015-09-11 15:45 ` Daniel Kiper 2015-09-11 15:45 ` Daniel Kiper 2015-09-14 8:42 ` Shannon Zhao 2015-09-14 8:42 ` Shannon Zhao 2015-09-14 8:42 ` Shannon Zhao 2015-09-14 9:09 ` Ard Biesheuvel 2015-09-14 9:09 ` Ard Biesheuvel 2015-09-14 9:09 ` Ard Biesheuvel 2015-09-14 9:09 ` Ard Biesheuvel 2015-09-14 9:31 ` Shannon Zhao 2015-09-14 9:31 ` Shannon Zhao 2015-09-14 9:31 ` Shannon Zhao 2015-09-14 9:36 ` Ard Biesheuvel 2015-09-14 9:36 ` Ard Biesheuvel 2015-09-14 9:36 ` Ard Biesheuvel 2015-09-14 10:39 ` Jan Beulich 2015-09-14 10:39 ` [Xen-devel] " Jan Beulich 2015-09-14 10:39 ` Jan Beulich 2015-09-14 10:39 ` Jan Beulich 2015-09-14 11:16 ` Ard Biesheuvel 2015-09-14 11:16 ` [Xen-devel] " Ard Biesheuvel 2015-09-14 11:16 ` Ard Biesheuvel 2015-09-14 11:16 ` Ard Biesheuvel 2015-09-14 11:34 ` Jan Beulich 2015-09-14 11:34 ` Jan Beulich 2015-09-14 11:34 ` Jan Beulich 2015-09-14 11:34 ` Jan Beulich 2015-09-14 9:36 ` Ard Biesheuvel 2015-09-11 15:45 ` Daniel Kiper 2015-09-11 16:33 ` Mark Rutland 2015-09-11 16:33 ` Mark Rutland 2015-09-11 16:33 ` Mark Rutland 2015-09-11 16:33 ` Mark Rutland 2015-09-11 16:25 ` Mark Rutland 2015-09-11 16:25 ` Mark Rutland 2015-09-11 16:25 ` Mark Rutland 2015-09-12 11:36 ` Daniel Kiper 2015-09-12 11:36 ` Daniel Kiper 2015-09-12 11:36 ` Daniel Kiper 2015-09-12 11:36 ` Daniel Kiper 2015-09-14 9:25 ` Mark Rutland 2015-09-14 9:25 ` Mark Rutland 2015-09-14 9:25 ` Mark Rutland 2015-09-14 9:25 ` Mark Rutland 2015-09-14 9:43 ` Ard Biesheuvel 2015-09-14 9:43 ` Ard Biesheuvel 2015-09-14 9:57 ` Ian Campbell [not found] ` <CAKv+Gu9ER1cKvPHobq-wo7ggPesJj4OQ7=aTr24GVpubHvVqjQ-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org> 2015-09-14 9:57 ` Ian Campbell 2015-09-14 9:57 ` Ian Campbell [not found] ` <1442224673.3549.131.camel-Sxgqhf6Nn4DQT0dZR+AlfA@public.gmane.org> 2015-09-14 10:02 ` Ard Biesheuvel [this message] 2015-09-14 10:02 ` Ard Biesheuvel 2015-09-14 10:25 ` Ian Campbell [not found] ` <CAKv+Gu_Gh649EwdtodLY9Q28JhqYg8o6RShXXH1ZbxsfYRfi2Q-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org> 2015-09-14 10:25 ` Ian Campbell 2015-09-14 10:25 ` Ian Campbell 2015-09-14 10:02 ` Ard Biesheuvel 2015-09-14 12:28 ` Daniel Kiper 2015-09-14 12:28 ` Daniel Kiper [not found] ` <20150914122858.GI4530-fJNZiO034lp9pOct4yEdx/3oZC3j2Omk@public.gmane.org> 2015-09-14 13:09 ` Ard Biesheuvel 2015-09-14 13:09 ` Ard Biesheuvel [not found] ` <CAKv+Gu_z2X=9-qgoKTS7dKLqtSUvysyu9LzZryJqcSR4X8Ss6A-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org> 2015-09-14 13:57 ` Daniel Kiper 2015-09-14 13:57 ` Daniel Kiper 2015-09-14 13:57 ` Daniel Kiper 2015-09-14 13:09 ` Ard Biesheuvel 2015-09-14 12:28 ` Daniel Kiper 2015-09-14 9:43 ` Ard Biesheuvel 2015-09-14 9:47 ` Stefano Stabellini 2015-09-14 9:47 ` Stefano Stabellini 2015-09-14 9:47 ` Stefano Stabellini 2015-09-14 9:47 ` Stefano Stabellini 2015-09-14 12:19 ` Daniel Kiper 2015-09-14 12:19 ` Daniel Kiper 2015-09-14 12:19 ` Daniel Kiper 2015-09-14 12:19 ` Daniel Kiper 2015-09-11 16:25 ` Mark Rutland 2015-09-10 16:23 ` Mark Rutland 2015-09-11 11:00 ` Ian Campbell 2015-09-11 11:00 ` Ian Campbell 2015-09-11 11:00 ` Ian Campbell 2015-09-11 11:00 ` Ian Campbell 2015-09-10 16:10 ` Stefano Stabellini 2015-09-10 13:52 ` Stefano Stabellini 2015-09-10 12:55 ` Jan Beulich 2015-09-10 12:55 ` Jan Beulich 2015-09-10 12:55 ` Jan Beulich 2015-09-10 12:55 ` Jan Beulich 2015-09-10 14:53 ` Mark Rutland 2015-09-10 14:53 ` Mark Rutland 2015-09-10 14:53 ` Mark Rutland 2015-09-10 15:06 ` Jan Beulich 2015-09-10 15:06 ` Jan Beulich 2015-09-10 15:06 ` Jan Beulich 2015-09-10 15:06 ` Jan Beulich 2015-09-11 16:36 ` Mark Rutland 2015-09-11 16:36 ` Mark Rutland 2015-09-11 16:36 ` Mark Rutland 2015-09-11 16:36 ` Mark Rutland 2015-09-10 11:24 ` Mark Rutland 2015-09-10 9:52 ` Mark Rutland 2015-09-10 11:32 ` Andrew Turner 2015-09-10 11:32 ` Andrew Turner 2015-09-10 11:32 ` Andrew Turner 2015-09-10 11:48 ` Julien Grall 2015-09-10 11:48 ` Julien Grall 2015-09-10 11:48 ` Julien Grall 2015-09-10 12:05 ` Roger Pau Monné 2015-09-10 12:05 ` Roger Pau Monné 2015-09-10 12:05 ` Roger Pau Monné 2015-09-10 12:53 ` [Xen-devel] " Julien Grall 2015-09-10 12:53 ` Julien Grall 2015-09-10 12:53 ` Julien Grall 2015-09-10 12:53 ` Julien Grall 2015-09-10 12:05 ` Roger Pau Monné 2015-09-10 11:48 ` Julien Grall 2015-09-10 11:32 ` Andrew Turner 2015-09-17 11:43 ` Shannon Zhao 2015-09-17 11:43 ` Shannon Zhao 2015-09-17 11:43 ` Shannon Zhao 2015-09-17 11:43 ` Shannon Zhao -- strict thread matches above, loose matches on Subject: below -- 2015-09-10 8:41 Shannon Zhao
Reply instructions: You may reply publicly to this message via plain-text email using any one of the following methods: * Save the following mbox file, import it into your mail client, and reply-to-all from there: mbox Avoid top-posting and favor interleaved quoting: https://en.wikipedia.org/wiki/Posting_style#Interleaved_style * Reply using the --to, --cc, and --in-reply-to switches of git-send-email(1): git send-email \ --in-reply-to=CAKv+Gu_Gh649EwdtodLY9Q28JhqYg8o6RShXXH1ZbxsfYRfi2Q@mail.gmail.com \ --to=ard.biesheuvel-qsej5fyqhm4dnm+yrofe0a@public.gmane.org \ --cc=christoffer.dall-QSEj5FYQhm4dnm+yROfE0A@public.gmane.org \ --cc=daniel.kiper-QHcLZuEGTsvQT0dZR+AlfA@public.gmane.org \ --cc=ian.campbell-Sxgqhf6Nn4DQT0dZR+AlfA@public.gmane.org \ --cc=jbeulich-IBi9RG/b67k@public.gmane.org \ --cc=julien.grall-Sxgqhf6Nn4DQT0dZR+AlfA@public.gmane.org \ --cc=konrad.wilk-QHcLZuEGTsvQT0dZR+AlfA@public.gmane.org \ --cc=leif.lindholm-QSEj5FYQhm4dnm+yROfE0A@public.gmane.org \ --cc=linux-arm-kernel-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org \ --cc=linux-efi-u79uwXL29TY76Z2rM5mHXA@public.gmane.org \ --cc=mark.rutland-5wv7dgnIgG8@public.gmane.org \ --cc=matt.fleming-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org \ --cc=peter.huangpeng-hv44wF8Li93QT0dZR+AlfA@public.gmane.org \ --cc=shannon.zhao-QSEj5FYQhm4dnm+yROfE0A@public.gmane.org \ --cc=stefano.stabellini-mvvWK6WmYclDPfheJLI6IQ@public.gmane.org \ --cc=xen-devel-GuqFBffKawuEi8DpZVb4nw@public.gmane.org \ --cc=zhaoshenglong-hv44wF8Li93QT0dZR+AlfA@public.gmane.org \ /path/to/YOUR_REPLY https://kernel.org/pub/software/scm/git/docs/git-send-email.html * If your mail client supports setting the In-Reply-To header via mailto: links, try the mailto: linkBe sure your reply has a Subject: header at the top and a blank line before the message body.
This is an external index of several public inboxes, see mirroring instructions on how to clone and mirror all data and code used by this external index.