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Re: [Qemu-devel] [PATCH v4.1] Add optionrom compatible with fw_cfg DMA v

From: Richard W.M. Jones
Subject: Re: [Qemu-devel] [PATCH v4.1] Add optionrom compatible with fw_cfg DMA version
Date: Mon, 4 Apr 2016 16:21:12 +0100
User-agent: Mutt/1.5.20 (2009-12-10)

On Mon, Apr 04, 2016 at 04:02:04PM +0100, Stefan Hajnoczi wrote:
>   (1) initrd loading is broken, kernel complains it finds only gibberish:
>   [    0.934582] Unpacking initramfs...
>   [    1.166983] Initramfs unpacking failed: junk in compressed archive
>   [    1.168458] Freeing initrd memory: 32812k freed

That's strange.  I certainly never saw anything like this.  I wonder
if it's because your initrd is particularly large?

>   (2) going back to non-dma boot via -M pc-$old doesn't work, appearently
>       fw_cfg dma is enabled even for old machine types.

IIRC there was a thread about how we accidentally added DMA to old
machine types.  Does this matter?


Richard Jones, Virtualization Group, Red Hat http://people.redhat.com/~rjones
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