Re: [PATCH v2 12/16] ARM: Xen: Document UEFI support on Xen ARM virtual platforms

From	Stefano Stabellini <stefano.stabellini@eu.citrix.com>
Newsgroups	linux.kernel
Subject	Re: [PATCH v2 12/16] ARM: Xen: Document UEFI support on Xen ARM virtual platforms
Date	2016-01-19 13:30 +0100
Message-ID	<qSDA6-7Pd-15@gated-at.bofh.it> (permalink)
References	(1 earlier) <qR6wz-2kF-31@gated-at.bofh.it> <qSfHs-7W3-9@gated-at.bofh.it> <qSlWy-3Wp-7@gated-at.bofh.it> <qSBHY-6r0-5@gated-at.bofh.it> <qSC1k-6y1-11@gated-at.bofh.it>
Organization	linux.* mail to news gateway

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On Tue, 19 Jan 2016, Mark Rutland wrote:
> On Tue, Jan 19, 2016 at 06:25:25PM +0800, Shannon Zhao wrote:
> > >> We don't do this in Documentation/arm/uefi.txt, and I don't see why we
> > >> should do so here.
> > >>
> > >> Does Xen handle arbitrary size memory map descriptors? I'm not sure what
> > >> new information might be passed in future additions to the descriptor
> > >> format, and I'm not sure what should happen in the Dom0 case.
> > > 
> > > Xen passes to Dom0 the memory map in the same format as the native
> > > memory map.
> 
> Does Xen parse or modify the EFI memory map in any way?

Xen:
- calls EFI_BOOT_SERVICES.GetMemoryMap()
- takes note of the memory regions for its own usage
- create the fdt notes, including efi-mmap-start, with a pointer to it


> Does it pass the raw values returned by EFI_BOOT_SERVICES.GetMemoryMap()
> through to the xen,uefi-* properties, or does is make any static
> assumptions about what the values will be?

It just passes the raw values.


> I'm trying to get a feeling for what the behaviour will be if/when a
> version of the EFI spec expands the memory map format.

Linux is likely to get the memory map in the same format as it's
provided on native.

Thread

Re: [PATCH v2 12/16] ARM: Xen: Document UEFI support on Xen ARM  virtual platforms Mark Rutland <mark.rutland@arm.com> - 2016-01-18 12:00 +0100
  Re: [PATCH v2 12/16] ARM: Xen: Document UEFI support on Xen ARM  virtual platforms Stefano Stabellini <stefano.stabellini@eu.citrix.com> - 2016-01-18 18:40 +0100
    Re: [PATCH v2 12/16] ARM: Xen: Document UEFI support on Xen ARM virtual  platforms Shannon Zhao <zhaoshenglong@huawei.com> - 2016-01-19 11:30 +0100
      Re: [PATCH v2 12/16] ARM: Xen: Document UEFI support on Xen ARM  virtual platforms Mark Rutland <mark.rutland@arm.com> - 2016-01-19 11:50 +0100
        Re: [PATCH v2 12/16] ARM: Xen: Document UEFI support on Xen ARM  virtual platforms Stefano Stabellini <stefano.stabellini@eu.citrix.com> - 2016-01-19 13:30 +0100
          Re: [PATCH v2 12/16] ARM: Xen: Document UEFI support on Xen ARM  virtual platforms Ard Biesheuvel <ard.biesheuvel@linaro.org> - 2016-01-19 14:20 +0100
          Re: [PATCH v2 12/16] ARM: Xen: Document UEFI support on Xen ARM  virtual platforms Mark Rutland <mark.rutland@arm.com> - 2016-01-19 14:20 +0100
            Re: [PATCH v2 12/16] ARM: Xen: Document UEFI support on Xen ARM virtual  platforms Shannon Zhao <shannon.zhao@linaro.org> - 2016-01-19 14:50 +0100
              Re: [PATCH v2 12/16] ARM: Xen: Document UEFI support on Xen ARM  virtual platforms Stefano Stabellini <stefano.stabellini@eu.citrix.com> - 2016-01-19 15:20 +0100
              Re: [PATCH v2 12/16] ARM: Xen: Document UEFI support on Xen ARM  virtual platforms Mark Rutland <mark.rutland@arm.com> - 2016-01-21 13:00 +0100

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