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Re: [Qemu-devel] QEMU etc/e820 and fw_cfg
From: |
Gerd Hoffmann |
Subject: |
Re: [Qemu-devel] QEMU etc/e820 and fw_cfg |
Date: |
Wed, 04 Mar 2015 14:20:31 +0100 |
On Di, 2015-03-03 at 10:32 +0000, Gordan Bobic wrote:
> I need to pass a custom e820 map to a virtual machine for
> troubleshooting purposes and working around IOMMU hardware
> bugs.
>
> I have found references to a custom map being providable
> via an external file, mentioned as "etc/e820" and "fw_cfg".
That is the (filesystem-like) interface between qemu and firmware
(seabios usually), it doesn't refer to a on-disk file.
> Unfortunately, I have not found any documentation that
> explains how to use this from userspace when invoking
> qemu.
You can't.
Passing a different e820 map requires patching qemu (or seabios, which
mangles the e820 table to add reservations for acpi etc).
What exactly do you need?
cheers,
Gerd
- [Qemu-devel] QEMU etc/e820 and fw_cfg, Gordan Bobic, 2015/03/03
- Re: [Qemu-devel] QEMU etc/e820 and fw_cfg,
Gerd Hoffmann <=
- Re: [Qemu-devel] QEMU etc/e820 and fw_cfg, Gordan Bobic, 2015/03/04
- Re: [Qemu-devel] QEMU etc/e820 and fw_cfg, Gerd Hoffmann, 2015/03/05
- Re: [Qemu-devel] QEMU etc/e820 and fw_cfg, Gordan Bobic, 2015/03/05
- Re: [Qemu-devel] QEMU etc/e820 and fw_cfg, Gerd Hoffmann, 2015/03/05
- Re: [Qemu-devel] QEMU etc/e820 and fw_cfg, Gordan Bobic, 2015/03/05
- Re: [Qemu-devel] QEMU etc/e820 and fw_cfg, Gerd Hoffmann, 2015/03/05