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Re: [PATCH v2 4/5] arm/efi: Simplify efi_arch_handle_cmdline()
- To: Luca Fancellu <Luca.Fancellu@xxxxxxx>
- From: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
- Date: Thu, 23 Nov 2023 10:35:49 +0000
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- Cc: Xen-devel <xen-devel@xxxxxxxxxxxxxxxxxxxx>, Jan Beulich <JBeulich@xxxxxxxx>, Roger Pau Monné <roger.pau@xxxxxxxxxx>, Wei Liu <wl@xxxxxxx>, Stefano Stabellini <sstabellini@xxxxxxxxxx>, Julien Grall <julien@xxxxxxx>, Volodymyr Babchuk <Volodymyr_Babchuk@xxxxxxxx>, Bertrand Marquis <Bertrand.Marquis@xxxxxxx>, Roberto Bagnara <roberto.bagnara@xxxxxxxxxxx>, Nicola Vetrini <nicola.vetrini@xxxxxxxxxxx>, Henry Wang <Henry.Wang@xxxxxxx>
- Delivery-date: Thu, 23 Nov 2023 10:35:54 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 23/11/2023 9:46 am, Luca Fancellu wrote:
>
>> On 22 Nov 2023, at 18:03, Andrew Cooper <andrew.cooper3@xxxxxxxxxx> wrote:
>>
>> On 22/11/2023 3:49 pm, Luca Fancellu wrote:
>>>> On 21 Nov 2023, at 20:41, Andrew Cooper <andrew.cooper3@xxxxxxxxxx> wrote:
>>>>
>>>> On 21/11/2023 8:33 pm, Luca Fancellu wrote:
>>>>> + CC henry
>>>>>
>>>>>> On 21 Nov 2023, at 20:15, Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
>>>>>> wrote:
>>>>>>
>>>>>> -Wwrite-strings is unhappy with assigning "xen" to a mutable pointer,
>>>>>> but this
>>>>>> logic looks incorrect. It was inherited from the x86 side, where the
>>>>>> logic
>>>>>> was redundant and has now been removed.
>>>>>>
>>>>>> In the ARM case it inserts the image name into "xen,xen-bootargs" and
>>>>>> there is
>>>>>> no logic at all to strip this before parsing it as the command line.
>>>>>>
>>>>>> The absence of any logic to strip an image name suggests that it
>>>>>> shouldn't
>>>>>> exist there, or having a Xen image named e.g. "hmp-unsafe" in the
>>>>>> filesystem
>>>>>> is going to lead to some unexpected behaviour on boot.
>>>>>>
>>>>>> No functional change.
>>>>>>
>>>>>> Signed-off-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
>>>>>> ---
>>>>>> CC: Jan Beulich <JBeulich@xxxxxxxx>
>>>>>> CC: Roger Pau Monné <roger.pau@xxxxxxxxxx>
>>>>>> CC: Wei Liu <wl@xxxxxxx>
>>>>>> CC: Stefano Stabellini <sstabellini@xxxxxxxxxx>
>>>>>> CC: Julien Grall <julien@xxxxxxx>
>>>>>> CC: Volodymyr Babchuk <Volodymyr_Babchuk@xxxxxxxx>
>>>>>> CC: Bertrand Marquis <bertrand.marquis@xxxxxxx>
>>>>>> CC: Roberto Bagnara <roberto.bagnara@xxxxxxxxxxx>
>>>>>> CC: Nicola Vetrini <nicola.vetrini@xxxxxxxxxxx>
>>>>>>
>>>>>> v2:
>>>>>> * New.
>>>>>>
>>>>>> I'm afraid that all of this reasoning is based on reading the source
>>>>>> code. I
>>>>>> don't have any way to try this out in a real ARM UEFI environment.
>>>>> I will test this one tomorrow on an arm board
>>> I confirm that booting though UEFI on an arm board works
>>>
>>> Reviewed-by: Luca Fancellu <luca.fancellu@xxxxxxx>
>>> Tested-by: Luca Fancellu <luca.fancellu@xxxxxxx>
>> Thanks, and you confirmed that the first cmdline parameter is still usable?
> Yes, I’m using a xen.cfg like this:
>
> [global]
> default=xen
>
> [xen]
> options=noreboot dom0_mem=4096M bootscrub=0 iommu=on loglvl=error
> guest_loglvl=error
> kernel=Image console=hvc0 earlycon=xenboot rootwait
> root=PARTUUID=6a60524d-061d-454a-bfd1-38989910eccd
>
> And in Xen boot I can see this:
>
> [...]
> (XEN) Command line: noreboot dom0_mem=4096M bootscrub=0 iommu=on
> loglvl=error guest_loglvl=error
> [...]
>
> So I think it’s passing every parameter
Thankyou all for the testing.
~Andrew
|
