linux-kernel - Re: Use PCI ROMs from EFI boot services

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Message-ID: <CAE9FiQXOLYL8D=-iBzg+SKnAwefP_uTHNh31UCHTSQg24VCQig@mail.gmail.com>
Date:	Wed, 5 Dec 2012 16:22:00 -0800
From:	Yinghai Lu <yinghai@...nel.org>
To:	Matthew Garrett <mjg59@...f.ucam.org>
Cc:	Bjorn Helgaas <bhelgaas@...gle.com>, linux-kernel@...r.kernel.org,
	linux-pci@...r.kernel.org, linux-efi@...r.kernel.org,
	mfleming@...el.com, dwmw2@...radead.org,
	"H. Peter Anvin" <hpa@...or.com>,
	"Eric W. Biederman" <ebiederm@...ssion.com>
Subject: Re: Use PCI ROMs from EFI boot services

On Wed, Dec 5, 2012 at 4:18 PM, Matthew Garrett <mjg59@...f.ucam.org> 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?

then how the kexeced get those info?

first kernel already reserved those info as E820_RESERVED_KERN.
and those info are for bootloader's of first kernel.
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