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Re: [PATCH v1 09/14] xen/arm: Add cmdline boot option "pci=on"

  • To: Julien Grall <julien@xxxxxxx>
  • From: Rahul Singh <Rahul.Singh@xxxxxxx>
  • Date: Fri, 20 Aug 2021 12:19:27 +0000
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  • Thread-topic: [PATCH v1 09/14] xen/arm: Add cmdline boot option "pci=on"

Hi Julien,

> On 19 Aug 2021, at 1:31 pm, Julien Grall <julien@xxxxxxx> wrote:
> Hi Rahul,
> On 19/08/2021 13:02, Rahul Singh wrote:
>> Add cmdline boot option "pci=on" to enable/disable the PCI init during
>> boot.
> I read this as "PCI" will be either disabled/enabled for the platform. 
> Whereas, I think it will be used to decide whether Xen discover PCI and PCI 
> passthrough is supported or not.

Yes. I will modify the option to "pci-passthrough== <boolean>"
> Can you also clarify why a user would want to select "pci=off"?

As pci-passthrough support emulate the PCI devices for DOM0 also, I thought if 
someone want to 
boot the DOM0 without emulating the PCI device in XEN and wants to have direct 
access to device.

I am ok to drop this patch if you feel adding the option is not required at all.



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