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Re: [Xen-devel] [PATCH] EFI: add efi=mapbs option and parse efi= early
- To: Marek Marczykowski-Górecki <marmarek@xxxxxxxxxxxxxxxxxxxxxx>, <xen-devel@xxxxxxxxxxxxxxxxxxxx>
- From: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
- Date: Thu, 8 Aug 2019 10:40:36 +0100
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- Cc: Stefano Stabellini <sstabellini@xxxxxxxxxx>, Wei Liu <wl@xxxxxxx>, Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>, George Dunlap <George.Dunlap@xxxxxxxxxxxxx>, Tim Deegan <tim@xxxxxxx>, Ian Jackson <ian.jackson@xxxxxxxxxxxxx>, Julien Grall <julien.grall@xxxxxxx>, Jan Beulich <jbeulich@xxxxxxxx>, Roger Pau Monné <roger.pau@xxxxxxxxxx>
- Delivery-date: Thu, 08 Aug 2019 09:40:51 +0000
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- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
- Openpgp: preference=signencrypt
On 08/08/2019 01:31, Marek Marczykowski-Górecki wrote:
> When booting Xen via xen.efi, there is /mapbs option to workaround
> certain platform issues (added in f36886bdf4 "EFI/early: add /mapbs to
> map EfiBootServices{Code,Data}"). Add support for efi=mapbs on Xen
> cmdline for the same effect and parse it very early in the
> multiboot2+EFI boot path.
>
> Normally cmdline is parsed after relocating MB2 structure, which happens
> too late. To have efi= parsed early enough, save cmdline pointer in
> head.S and pass it as yet another argument to efi_multiboot2(). This
> way we avoid introducing yet another MB2 structure parser.
>
> To keep consistency, handle efi= parameter early in xen.efi too, both in
> xen.efi command line and cfg file.
>
> Signed-off-by: Marek Marczykowski-Górecki <marmarek@xxxxxxxxxxxxxxxxxxxxxx>
I'm very sorry to do this to you, but I'm going to object to the patch
(in principle. I think the command line option itself is fine but...)
What does Linux do differently here?
It is actively damaging to the Xen community to users to force users
tweak command lines in order to boot/recover their system, and it looks
especially embarrassing when other OSes cope automatically. We have
compatibility for all kinds of other firmware screw-ups, except EFI it
seems, and this needs to change.
So while I have no objection to the option per say, I don't think this
patch is reasonable as a "fix" to the problem as far as end users are
concerned.
~Andrew
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