Re: Use PCI ROMs from EFI boot services

[H. Peter Anvin]

On 12/05/2012 04:18 PM, Matthew Garrett wrote:
> On Wed, Dec 05, 2012 at 04:15:56PM -0800, Yinghai Lu wrote:
> 
>> at the same time we should export setup_data into /sys, so kexec could
>> append this pointer to command of
>> second kernel, just like kexec append acpi_rsdp.
>> That should address DavidW's concern.
> 
> Why should the kernel export data to userspace just so that that data 
> can be passed back into the kernel?
> 

Because it also needs to modify it.  Right now kexec userspace
synthesizes struct boot_params from scratch, and does so incorrectly to
boot.  I think we have setup_data exported via debugfs but IIRC we never
got a strong enough use case for sysfs.

	-hpa

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