Messages in this thread | | | Date | Wed, 05 Dec 2012 16:21:32 -0800 | From | "H. Peter Anvin" <> | Subject | Re: Use PCI ROMs from EFI boot services |
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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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