From: "H. Peter Anvin" <hpa@zytor.com>
To: Matthew Garrett <mjg59@srcf.ucam.org>
Cc: Yinghai Lu <yinghai@kernel.org>,
Bjorn Helgaas <bhelgaas@google.com>,
linux-kernel@vger.kernel.org, linux-pci@vger.kernel.org,
linux-efi@vger.kernel.org, mfleming@intel.com,
dwmw2@infradead.org, "Eric W. Biederman" <ebiederm@xmission.com>
Subject: Re: Use PCI ROMs from EFI boot services
Date: Wed, 05 Dec 2012 16:21:32 -0800 [thread overview]
Message-ID: <50BFE50C.8030008@zytor.com> (raw)
In-Reply-To: <20121206001819.GA30527@srcf.ucam.org>
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
next prev parent reply other threads:[~2012-12-06 0:21 UTC|newest]
Thread overview: 60+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-08-23 16:36 Use PCI ROMs from EFI boot services Matthew Garrett
2012-08-23 16:36 ` [PATCH V3 1/4] EFI: Stash ROMs if they're not in the PCI BAR Matthew Garrett
2012-08-23 23:44 ` Bjorn Helgaas
2012-08-24 4:09 ` Matthew Garrett
2012-09-04 13:45 ` Matthew Garrett
2012-09-06 13:59 ` Bjorn Helgaas
2012-09-06 17:36 ` [PATCH] x86: Fix build warning on 32-bit Matthew Garrett
2012-09-06 20:02 ` Bjorn Helgaas
2012-08-23 16:36 ` [PATCH V3 2/4] PCI: Add pcibios_add_device Matthew Garrett
2012-08-23 16:36 ` [PATCH V3 3/4] PCI: Add support for non-BAR ROMs Matthew Garrett
2012-09-05 2:18 ` Don Dutile
2012-09-05 2:29 ` Matthew Garrett
2012-09-05 12:46 ` Alan Cox
2012-09-05 13:20 ` Matthew Garrett
2012-09-05 13:30 ` Alan Cox
2012-09-05 13:44 ` Matthew Garrett
2012-08-23 16:36 ` [PATCH V3 4/4] X86: Use PCI setup data Matthew Garrett
2012-08-24 9:30 ` Use PCI ROMs from EFI boot services David Woodhouse
2012-08-24 12:53 ` Matthew Garrett
[not found] ` <1345739803-21017-1-git-send-email-mjg-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
2012-10-25 17:35 ` Bjorn Helgaas
2012-10-25 17:35 ` Bjorn Helgaas
2012-12-03 20:02 ` Seth Forshee
2012-12-05 20:09 ` Bjorn Helgaas
[not found] ` <CAErSpo7S2+Vt+9bkGLx_=AY9aSGCvAnkHfqu01gTj=eKs7btNw-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2012-12-05 20:22 ` Matthew Garrett
2012-12-05 20:22 ` Matthew Garrett
[not found] ` <20121205202254.GA25398-1xO5oi07KQx4cg9Nei1l7Q@public.gmane.org>
2012-12-05 22:21 ` Bjorn Helgaas
2012-12-05 22:21 ` Bjorn Helgaas
2012-12-05 21:06 ` David Woodhouse
2012-12-05 21:06 ` David Woodhouse
2012-12-06 0:15 ` Yinghai Lu
[not found] ` <CAE9FiQVdpmmExrPrLf7HYVuo0cTY9Xjn6bWzObbuSSeQ-e1PbA-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2012-12-06 0:18 ` Matthew Garrett
2012-12-06 0:18 ` Matthew Garrett
2012-12-06 0:21 ` H. Peter Anvin [this message]
[not found] ` <50BFE50C.8030008-YMNOUZJC4hwAvxtiuMwx3w@public.gmane.org>
2012-12-06 0:30 ` Yinghai Lu
2012-12-06 0:30 ` Yinghai Lu
2012-12-06 0:36 ` H. Peter Anvin
[not found] ` <50BFE890.5070109-YMNOUZJC4hwAvxtiuMwx3w@public.gmane.org>
2012-12-06 0:57 ` Matthew Garrett
2012-12-06 0:57 ` Matthew Garrett
2012-12-06 1:04 ` H. Peter Anvin
2012-12-06 1:13 ` Matthew Garrett
[not found] ` <cd3b2e67-92af-494d-ba2d-4179ead6e06b-2ueSQiBKiTY7tOexoI0I+QC/G2K4zDHf@public.gmane.org>
2012-12-06 1:21 ` H. Peter Anvin
2012-12-06 1:21 ` H. Peter Anvin
[not found] ` <50BFF328.5030406-YMNOUZJC4hwAvxtiuMwx3w@public.gmane.org>
2012-12-06 6:19 ` Matthew Garrett
2012-12-06 6:19 ` Matthew Garrett
2012-12-06 1:00 ` Matthew Garrett
2012-12-06 0:22 ` Yinghai Lu
[not found] ` <20121206001819.GA30527-1xO5oi07KQx4cg9Nei1l7Q@public.gmane.org>
2012-12-06 0:23 ` Eric W. Biederman
2012-12-06 0:23 ` Eric W. Biederman
2012-12-06 0:36 ` H. Peter Anvin
2012-12-06 0:51 ` Yinghai Lu
[not found] ` <CAE9FiQXwZAAMkWYT8EjsewpuZ-OWqoaFscyzGS_pSuO9C3bf9A-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2012-12-06 0:52 ` Yinghai Lu
2012-12-06 0:52 ` Yinghai Lu
2012-12-06 18:19 ` Bjorn Helgaas
2012-12-06 18:26 ` H. Peter Anvin
[not found] ` <50C0E339.4030607-YMNOUZJC4hwAvxtiuMwx3w@public.gmane.org>
2012-12-06 18:54 ` Matthew Garrett
2012-12-06 18:54 ` Matthew Garrett
2012-12-06 18:57 ` Yinghai Lu
2012-12-06 21:44 ` Bjorn Helgaas
2012-12-06 0:56 ` H. Peter Anvin
2012-12-06 0:56 ` H. Peter Anvin
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