Re: [Xen-devel] [PATCH] efi/libstub/fdt: Standardize the names of EFI stub parameters

From	Ian Campbell <ian.campbell@citrix.com>
Newsgroups	linux.kernel
Subject	Re: [Xen-devel] [PATCH] efi/libstub/fdt: Standardize the names of EFI stub parameters
Date	2015-09-10 15:40 +0200
Message-ID	<q7af2-2PS-47@gated-at.bofh.it> (permalink)
References	(3 earlier) <q78dd-8pH-17@gated-at.bofh.it> <q78wy-kz-5@gated-at.bofh.it> <q78ZA-18A-19@gated-at.bofh.it> <q79Ci-1Rv-15@gated-at.bofh.it> <q79LX-2hY-3@gated-at.bofh.it>
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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.
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Thread

[PATCH] efi/libstub/fdt: Standardize the names of EFI stub parameters Shannon Zhao <zhaoshenglong@huawei.com> - 2015-09-10 11:00 +0200
  Re: [PATCH] efi/libstub/fdt: Standardize the names of EFI stub  parameters Mark Rutland <mark.rutland@arm.com> - 2015-09-10 12:00 +0200
    Re: [PATCH] efi/libstub/fdt: Standardize the names of EFI stub  parameters Stefano Stabellini <stefano.stabellini@eu.citrix.com> - 2015-09-10 12:30 +0200
      Re: [PATCH] efi/libstub/fdt: Standardize the names of EFI stub  parameters Mark Rutland <mark.rutland@arm.com> - 2015-09-10 13:30 +0200
        Re: [PATCH] efi/libstub/fdt: Standardize the names of EFI stub  parameters Stefano Stabellini <stefano.stabellini@eu.citrix.com> - 2015-09-10 13:50 +0200
          Re: [PATCH] efi/libstub/fdt: Standardize the names of EFI stub  parameters Mark Rutland <mark.rutland@arm.com> - 2015-09-10 14:20 +0200
            Re: [Xen-devel] [PATCH] efi/libstub/fdt: Standardize the names of  EFI stub parameters Ian Campbell <ian.campbell@citrix.com> - 2015-09-10 15:00 +0200
              Re: [Xen-devel] [PATCH] efi/libstub/fdt: Standardize the names  of EFI stub parameters "Jan Beulich" <JBeulich@suse.com> - 2015-09-10 15:10 +0200
                Re: [Xen-devel] [PATCH] efi/libstub/fdt: Standardize the names of  EFI stub parameters Ian Campbell <ian.campbell@citrix.com> - 2015-09-10 15:40 +0200
            Re: [PATCH] efi/libstub/fdt: Standardize the names of EFI stub  parameters Stefano Stabellini <stefano.stabellini@eu.citrix.com> - 2015-09-10 16:00 +0200
              Re: [PATCH] efi/libstub/fdt: Standardize the names of EFI stub  parameters Leif Lindholm <leif.lindholm@linaro.org> - 2015-09-10 16:20 +0200
              Re: [PATCH] efi/libstub/fdt: Standardize the names of EFI stub  parameters Mark Rutland <mark.rutland@arm.com> - 2015-09-10 16:50 +0200
                Re: [PATCH] efi/libstub/fdt: Standardize the names of EFI stub  parameters Stefano Stabellini <stefano.stabellini@eu.citrix.com> - 2015-09-10 18:20 +0200
                Re: [PATCH] efi/libstub/fdt: Standardize the names of EFI stub  parameters Mark Rutland <mark.rutland@arm.com> - 2015-09-10 18:30 +0200
                Re: [PATCH] efi/libstub/fdt: Standardize the names of EFI stub  parameters Daniel Kiper <daniel.kiper@oracle.com> - 2015-09-11 14:50 +0200
                Re: [PATCH] efi/libstub/fdt: Standardize the names of EFI stub  parameters Stefano Stabellini <stefano.stabellini@eu.citrix.com> - 2015-09-11 15:20 +0200
                Re: [PATCH] efi/libstub/fdt: Standardize the names of EFI stub parameters Ard Biesheuvel <ard.biesheuvel@linaro.org> - 2015-09-11 15:40 +0200
                Re: [PATCH] efi/libstub/fdt: Standardize the names of EFI stub  parameters Daniel Kiper <daniel.kiper@oracle.com> - 2015-09-11 17:50 +0200
                Re: [PATCH] efi/libstub/fdt: Standardize the names of EFI stub parameters Shannon Zhao <zhaoshenglong@huawei.com> - 2015-09-14 11:00 +0200
                Re: [PATCH] efi/libstub/fdt: Standardize the names of EFI stub parameters Ard Biesheuvel <ard.biesheuvel@linaro.org> - 2015-09-14 11:10 +0200
                Re: [PATCH] efi/libstub/fdt: Standardize the names of EFI stub parameters Shannon Zhao <zhaoshenglong@huawei.com> - 2015-09-14 11:40 +0200
                Re: [PATCH] efi/libstub/fdt: Standardize the names of EFI stub parameters Ard Biesheuvel <ard.biesheuvel@linaro.org> - 2015-09-14 11:40 +0200
                Re: [Xen-devel] [PATCH] efi/libstub/fdt: Standardize the names  of EFI stub parameters "Jan Beulich" <JBeulich@suse.com> - 2015-09-14 12:40 +0200
                Re: [Xen-devel] [PATCH] efi/libstub/fdt: Standardize the names of EFI  stub parameters Ard Biesheuvel <ard.biesheuvel@linaro.org> - 2015-09-14 13:20 +0200
                Re: [Xen-devel] [PATCH] efi/libstub/fdt: Standardize the names  of EFI stub parameters "Jan Beulich" <JBeulich@suse.com> - 2015-09-14 13:40 +0200
                Re: [PATCH] efi/libstub/fdt: Standardize the names of EFI stub  parameters Mark Rutland <mark.rutland@arm.com> - 2015-09-11 18:40 +0200
                Re: [PATCH] efi/libstub/fdt: Standardize the names of EFI stub  parameters Mark Rutland <mark.rutland@arm.com> - 2015-09-11 18:30 +0200
                Re: [PATCH] efi/libstub/fdt: Standardize the names of EFI stub  parameters Daniel Kiper <daniel.kiper@oracle.com> - 2015-09-12 13:50 +0200
                Re: [PATCH] efi/libstub/fdt: Standardize the names of EFI stub  parameters Mark Rutland <mark.rutland@arm.com> - 2015-09-14 11:30 +0200
                Re: [PATCH] efi/libstub/fdt: Standardize the names of EFI stub  parameters Stefano Stabellini <stefano.stabellini@eu.citrix.com> - 2015-09-14 11:50 +0200
                Re: [PATCH] efi/libstub/fdt: Standardize the names of EFI stub  parameters Daniel Kiper <daniel.kiper@oracle.com> - 2015-09-14 14:30 +0200
                Re: [PATCH] efi/libstub/fdt: Standardize the names of EFI stub  parameters Ian Campbell <ian.campbell@citrix.com> - 2015-09-11 13:10 +0200
          Re: [PATCH] efi/libstub/fdt: Standardize the names of EFI stub  parameters "Jan Beulich" <JBeulich@suse.com> - 2015-09-10 15:00 +0200
            Re: [PATCH] efi/libstub/fdt: Standardize the names of EFI stub  parameters Mark Rutland <mark.rutland@arm.com> - 2015-09-10 17:00 +0200
              Re: [PATCH] efi/libstub/fdt: Standardize the names of EFI stub  parameters "Jan Beulich" <JBeulich@suse.com> - 2015-09-10 17:10 +0200
                Re: [PATCH] efi/libstub/fdt: Standardize the names of EFI stub  parameters Mark Rutland <mark.rutland@arm.com> - 2015-09-11 18:40 +0200
  Re: [PATCH] efi/libstub/fdt: Standardize the names of EFI stub  parameters Andrew Turner <andrew@fubar.geek.nz> - 2015-09-10 13:50 +0200
    Re: [PATCH] efi/libstub/fdt: Standardize the names of EFI stub parameters Julien Grall <julien.grall@citrix.com> - 2015-09-10 13:50 +0200
      Re: [PATCH] efi/libstub/fdt: Standardize the names of EFI stub  parameters Roger Pau Monné <roger.pau@citrix.com> - 2015-09-10 14:10 +0200
        Re: [Xen-devel] [PATCH] efi/libstub/fdt: Standardize the names of  EFI stub parameters Julien Grall <julien.grall@citrix.com> - 2015-09-10 15:00 +0200
  Re: [PATCH] efi/libstub/fdt: Standardize the names of EFI stub parameters Shannon Zhao <zhaoshenglong@huawei.com> - 2015-09-17 14:00 +0200

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