From: Ian Campbell <ian.campbell@citrix.com>
To: Jan Beulich <JBeulich@suse.com>
Cc: Mark Rutland <mark.rutland@arm.com>,
"julien.grall@citrix.com" <julien.grall@citrix.com>,
Stefano Stabellini <stefano.stabellini@eu.citrix.com>,
"freebsd-arm@freebsd.org" <freebsd-arm@freebsd.org>,
"peter.huangpeng@huawei.com" <peter.huangpeng@huawei.com>,
Shannon Zhao <zhaoshenglong@huawei.com>,
"matt.fleming@intel.com" <matt.fleming@intel.com>,
"ard.biesheuvel@linaro.org" <ard.biesheuvel@linaro.org>,
"christoffer.dall@linaro.org" <christoffer.dall@linaro.org>,
"leif.lindholm@linaro.org" <leif.lindholm@linaro.org>,
"shannon.zhao@linaro.org" <shannon.zhao@linaro.org>,
"linux-arm-kernel@lists.infradead.org"
<linux-arm-kernel@lists.infradead.org>,
"xen-devel@lists.xen.org" <xen-devel@lists.xen.org>,
"daniel.kiper@oracle.com" <daniel.kiper@oracle.com>,
"devicetree@vger.kernel.org" <devicetree@vger.kernel.org>,
"linux-doc@vger.kernel.org" <linux-doc@vger.kernel.org>,
"linux-efi@vger.kernel.org" <linux-efi@vger.kernel.org>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>
Subject: Re: [Xen-devel] [PATCH] efi/libstub/fdt: Standardize the names of EFI stub parameters
Date: Thu, 10 Sep 2015 14:30:30 +0100 [thread overview]
Message-ID: <1441891830.24450.384.camel@citrix.com> (raw)
In-Reply-To: <55F19D0202000078000A1B54@prv-mh.provo.novell.com>
On Thu, 2015-09-10 at 07:08 -0600, Jan Beulich wrote:
> > > > On 10.09.15 at 14:58, <ian.campbell@citrix.com> wrote:
> > On Thu, 2015-09-10 at 13:15 +0100, Mark Rutland wrote:
> >
> > > > In any case this should be separate from the shim ABI discussion.
> > >
> > > I disagree; I think this is very much relevant to the ABI discussion.
> > > That's not to say that I insist on a particular approach, but I think
> > > that they need to be considered together.
> >
> > Taking a step back, the reason for using the EFI stub parameters is
> > only
> > (AFAIK) in order to be able to locate the ACPI RDSP (the root table
> > pointer), which as it happens is normally passed via one of the EFI
> > firmware tables.
> >
> > If there was a way to achieve that goal (i.e. another way to find the
> > RSDP)
> > without opening the can of UEFI worms then we could consider that
> > opiton
> > too.
> >
> > a way != the legacy x86 thing of scanning low memory of the signature,
> > of
> > course.
>
> But even x86 doesn't do that (other than as a fallback) on EFI.
Indeed, I was referring legacy (non-EFI) mode.
> The
> configuration table is available to Dom0 (via XENPF_firmware_info:
> XEN_FW_EFI_INFO:XEN_FW_EFI_CONFIG_TABLE).
Under ARM we find out we are running under Xen from the ACPI tables, so
there is a chicken and egg situation there.
Not insoluble I'm sure, if we want to go down this route.
Ian.
WARNING: multiple messages have this Message-ID (diff)
From: Ian Campbell <ian.campbell-Sxgqhf6Nn4DQT0dZR+AlfA@public.gmane.org>
To: Jan Beulich <JBeulich-IBi9RG/b67k@public.gmane.org>
Cc: Mark Rutland <mark.rutland-5wv7dgnIgG8@public.gmane.org>,
"julien.grall-Sxgqhf6Nn4DQT0dZR+AlfA@public.gmane.org"
<julien.grall-Sxgqhf6Nn4DQT0dZR+AlfA@public.gmane.org>,
Stefano Stabellini
<stefano.stabellini-mvvWK6WmYclDPfheJLI6IQ@public.gmane.org>,
"freebsd-arm-h+KGxgPPiopAfugRpC6u6w@public.gmane.org"
<freebsd-arm-h+KGxgPPiopAfugRpC6u6w@public.gmane.org>,
"peter.huangpeng-hv44wF8Li93QT0dZR+AlfA@public.gmane.org"
<peter.huangpeng-hv44wF8Li93QT0dZR+AlfA@public.gmane.org>,
Shannon Zhao
<zhaoshenglong-hv44wF8Li93QT0dZR+AlfA@public.gmane.org>,
"matt.fleming-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org"
<matt.fleming-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org>,
"ard.biesheuvel-QSEj5FYQhm4dnm+yROfE0A@public.gmane.org"
<ard.biesheuvel-QSEj5FYQhm4dnm+yROfE0A@public.gmane.org>,
"christoffer.dall-QSEj5FYQhm4dnm+yROfE0A@public.gmane.org"
<christoffer.dall-QSEj5FYQhm4dnm+yROfE0A@public.gmane.org>,
"leif.lindholm-QSEj5FYQhm4dnm+yROfE0A@public.gmane.org"
<leif.lindholm-QSEj5FYQhm4dnm+yROfE0A@public.gmane.org>,
"shannon.zhao-QSEj5FYQhm4dnm+yROfE0A@public.gmane.org"
<shannon.zhao-QSEj5FYQhm4dnm+yROfE0A@public.gmane.org>,
"linux-arm-kernel-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org"
<linux-arm-kernel-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org>,
"xen-devel-GuqFBffKawuEi8DpZVb4nw@public.gmane.org"
<xen-devel-GuqFBffKawuEi8DpZVb4nw@public.gmane.org>,
"daniel.kiper-QHcLZuEGTsvQT0dZR+AlfA@public.gmane.org"
<daniel.kiper-QHcLZuEGTsvQT0dZR+AlfA@public.gmane.org>,
"devicetree-u79uwXL29TY76Z2rM5mHXA@public.gmane.org"
<devicetree-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>,
"linux-doc-u79uwXL29TY76Z2rM5mHXA@public.gmane.org"
<linux-doc-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>l
Subject: Re: [Xen-devel] [PATCH] efi/libstub/fdt: Standardize the names of EFI stub parameters
Date: Thu, 10 Sep 2015 14:30:30 +0100 [thread overview]
Message-ID: <1441891830.24450.384.camel@citrix.com> (raw)
In-Reply-To: <55F19D0202000078000A1B54-rw/UEucdPrvD8XXLLHKrIiOjQekVJEpY@public.gmane.org>
On Thu, 2015-09-10 at 07:08 -0600, Jan Beulich wrote:
> > > > On 10.09.15 at 14:58, <ian.campbell-Sxgqhf6Nn4DQT0dZR+AlfA@public.gmane.org> wrote:
> > On Thu, 2015-09-10 at 13:15 +0100, Mark Rutland wrote:
> >
> > > > In any case this should be separate from the shim ABI discussion.
> > >
> > > I disagree; I think this is very much relevant to the ABI discussion.
> > > That's not to say that I insist on a particular approach, but I think
> > > that they need to be considered together.
> >
> > Taking a step back, the reason for using the EFI stub parameters is
> > only
> > (AFAIK) in order to be able to locate the ACPI RDSP (the root table
> > pointer), which as it happens is normally passed via one of the EFI
> > firmware tables.
> >
> > If there was a way to achieve that goal (i.e. another way to find the
> > RSDP)
> > without opening the can of UEFI worms then we could consider that
> > opiton
> > too.
> >
> > a way != the legacy x86 thing of scanning low memory of the signature,
> > of
> > course.
>
> But even x86 doesn't do that (other than as a fallback) on EFI.
Indeed, I was referring legacy (non-EFI) mode.
> The
> configuration table is available to Dom0 (via XENPF_firmware_info:
> XEN_FW_EFI_INFO:XEN_FW_EFI_CONFIG_TABLE).
Under ARM we find out we are running under Xen from the ACPI tables, so
there is a chicken and egg situation there.
Not insoluble I'm sure, if we want to go down this route.
Ian.
--
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WARNING: multiple messages have this Message-ID (diff)
From: ian.campbell@citrix.com (Ian Campbell)
To: linux-arm-kernel@lists.infradead.org
Subject: [Xen-devel] [PATCH] efi/libstub/fdt: Standardize the names of EFI stub parameters
Date: Thu, 10 Sep 2015 14:30:30 +0100 [thread overview]
Message-ID: <1441891830.24450.384.camel@citrix.com> (raw)
In-Reply-To: <55F19D0202000078000A1B54@prv-mh.provo.novell.com>
On Thu, 2015-09-10 at 07:08 -0600, Jan Beulich wrote:
> > > > On 10.09.15 at 14:58, <ian.campbell@citrix.com> wrote:
> > On Thu, 2015-09-10 at 13:15 +0100, Mark Rutland wrote:
> >
> > > > In any case this should be separate from the shim ABI discussion.
> > >
> > > I disagree; I think this is very much relevant to the ABI discussion.
> > > That's not to say that I insist on a particular approach, but I think
> > > that they need to be considered together.
> >
> > Taking a step back, the reason for using the EFI stub parameters is
> > only
> > (AFAIK) in order to be able to locate the ACPI RDSP (the root table
> > pointer), which as it happens is normally passed via one of the EFI
> > firmware tables.
> >
> > If there was a way to achieve that goal (i.e. another way to find the
> > RSDP)
> > without opening the can of UEFI worms then we could consider that
> > opiton
> > too.
> >
> > a way != the legacy x86 thing of scanning low memory of the signature,
> > of
> > course.
>
> But even x86 doesn't do that (other than as a fallback) on EFI.
Indeed, I was referring legacy (non-EFI) mode.
> The
> configuration table is available to Dom0 (via XENPF_firmware_info:
> XEN_FW_EFI_INFO:XEN_FW_EFI_CONFIG_TABLE).
Under ARM we find out we are running under Xen from the ACPI tables, so
there is a chicken and egg situation there.
Not insoluble I'm sure, if we want to go down this route.
Ian.
next prev parent reply other threads:[~2015-09-10 13:30 UTC|newest]
Thread overview: 181+ 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 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 12:15 ` Mark Rutland
2015-09-10 12:15 ` Mark Rutland
2015-09-10 12:15 ` Mark Rutland
2015-09-10 12:58 ` Ian Campbell
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 ` Jan Beulich
2015-09-10 13:08 ` Jan Beulich
2015-09-10 13:30 ` Ian Campbell [this message]
2015-09-10 13:30 ` Ian Campbell
2015-09-10 13:30 ` Ian Campbell
2015-09-10 13:30 ` Ian Campbell
2015-09-10 13:08 ` Jan Beulich
2015-09-10 13:52 ` Stefano Stabellini
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 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 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 9:31 ` 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 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 ` [Xen-devel] " Jan Beulich
2015-09-14 11:34 ` Jan Beulich
2015-09-14 11:34 ` Jan Beulich
2015-09-14 9:09 ` 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 13:30 ` Ard Biesheuvel
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
2015-09-14 12:28 ` Daniel Kiper
[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
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
2015-09-14 13:09 ` Ard Biesheuvel
[not found] ` <20150914122858.GI4530-fJNZiO034lp9pOct4yEdx/3oZC3j2Omk@public.gmane.org>
2015-09-14 13:09 ` Ard Biesheuvel
2015-09-14 13:09 ` Ard Biesheuvel
2015-09-14 13:57 ` Daniel Kiper
[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 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
2015-09-11 12:46 ` Daniel Kiper
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 12:15 ` Mark Rutland
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
2015-09-11 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 15:06 ` Jan Beulich
2015-09-10 11:37 ` Stefano Stabellini
2015-09-10 11:24 ` 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 11:32 ` 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 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
2015-09-17 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
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