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Re: [Qemu-devel] [RFC PATCH 0/2] host->guest environment variables via f
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From: |
Matt Fleming |
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Subject: |
Re: [Qemu-devel] [RFC PATCH 0/2] host->guest environment variables via fw_cfg |
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Date: |
Thu, 26 Feb 2015 10:55:35 +0000 |
On Thu, 2015-02-26 at 10:45 +0100, Laszlo Ersek wrote:
> On 02/26/15 02:13, Gabriel L. Somlo wrote:
> > For myself, I'm tempted to write a kernel driver to allow me to simply
> > "cat /sys/firmware/fw_cfg/etc/guestinfo | grep '^key_name='" when I
> > need to retrieve a guest environment variable.
>
> You might not need a kernel driver for this. If you have ioport access
> (on x86), you can speak the fwcfg "protocol" directly.
Personally, I'd be much happier to see this information exposed
via /sys/firmware/fw_cfg, not least because that allows you to use the
same tools on x86, arm64, etc.